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chromium / external / github.com / git / git / refs/tags/v2.24.2 / . / daemon.c
blob: 9d2e0d20ef302aaeac02aaeba791509dd43a2712 [file] [log] [blame]
Randal L. Schwartz979e32f2005-10-25 23:29:09[diff] [blame]1#include "cache.h"
Brandon Williamsb2141fc2017-06-14 18:07:36[diff] [blame]2#include "config.h"
Junio C Hamano85023572006-12-19 22:34:12[diff] [blame]3#include "pkt-line.h"
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]4#include "run-command.h"
5#include "strbuf.h"
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]6#include "string-list.h"
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]7
Markus Duft28449232010-10-27 08:39:52[diff] [blame]8#ifdef NO_INITGROUPS
9#define initgroups(x, y) (0) /* nothing */
10#endif
11
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]12static enum log_destination {
13 LOG_DESTINATION_UNSET = -1,
14 LOG_DESTINATION_NONE = 0,
15 LOG_DESTINATION_STDERR = 1,
16 LOG_DESTINATION_SYSLOG = 2,
17} log_destination = LOG_DESTINATION_UNSET;
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]18static int verbose;
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]19static int reuseaddr;
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]20static int informative_errors;
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]21
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]22static const char daemon_usage[] =
Stephan Beyer1b1dd232008-07-13 13:36:15[diff] [blame]23"git daemon [--verbose] [--syslog] [--export-all]\n"
Štěpán Němec62b46982010-10-08 17:31:15[diff] [blame]24" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
25" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
26" [--user-path | --user-path=<path>]\n"
27" [--interpolated-path=<path>]\n"
Erik Faye-Lund9cddf562010-11-04 01:35:23[diff] [blame]28" [--reuseaddr] [--pid-file=<file>]\n"
Štěpán Němec62b46982010-10-08 17:31:15[diff] [blame]29" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]30" [--access-hook=<path>]\n"
Štěpán Němec62b46982010-10-08 17:31:15[diff] [blame]31" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
Erik Faye-Lund9cddf562010-11-04 01:35:23[diff] [blame]32" [--detach] [--user=<user> [--group=<group>]]\n"
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]33" [--log-destination=(stderr|syslog|none)]\n"
Štěpán Němec62b46982010-10-08 17:31:15[diff] [blame]34" [<directory>...]";
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]35
36/* List of acceptable pathname prefixes */
Jeff King3f2e2292016-07-01 05:58:58[diff] [blame]37static const char **ok_paths;
David Rientjes96f1e582006-08-15 17:23:48[diff] [blame]38static int strict_paths;
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]39
40/* If this is set, git-daemon-export-ok is not required */
David Rientjes96f1e582006-08-15 17:23:48[diff] [blame]41static int export_all_trees;
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]42
Petr Baudisb21c31c2005-12-23 01:27:40[diff] [blame]43/* Take all paths relative to this one if non-NULL */
Jeff King1055a892014-06-18 19:41:58[diff] [blame]44static const char *base_path;
45static const char *interpolated_path;
Jens Axboe73a7a652007-07-27 21:00:29[diff] [blame]46static int base_path_relaxed;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]47
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]48/* If defined, ~user notation is allowed and the string is inserted
49 * after ~user/. E.g. a request to git://host/~alice/frotz would
50 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
51 */
David Rientjes96f1e582006-08-15 17:23:48[diff] [blame]52static const char *user_path;
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]53
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]54/* Timeout, and initial timeout */
David Rientjes96f1e582006-08-15 17:23:48[diff] [blame]55static unsigned int timeout;
56static unsigned int init_timeout;
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]57
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]58struct hostinfo {
59 struct strbuf hostname;
60 struct strbuf canon_hostname;
61 struct strbuf ip_address;
62 struct strbuf tcp_port;
63 unsigned int hostname_lookup_done:1;
64 unsigned int saw_extended_args:1;
65};
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]66
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]67static void lookup_hostname(struct hostinfo *hi);
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]68
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]69static const char *get_canon_hostname(struct hostinfo *hi)
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]70{
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]71 lookup_hostname(hi);
72 return hi->canon_hostname.buf;
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]73}
74
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]75static const char *get_ip_address(struct hostinfo *hi)
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]76{
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]77 lookup_hostname(hi);
78 return hi->ip_address.buf;
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]79}
80
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]81static void logreport(int priority, const char *err, va_list params)
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]82{
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]83 switch (log_destination) {
84 case LOG_DESTINATION_SYSLOG: {
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]85 char buf[1024];
86 vsnprintf(buf, sizeof(buf), err, params);
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]87 syslog(priority, "%s", buf);
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]88 break;
89 }
90 case LOG_DESTINATION_STDERR:
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]91 /*
Erik Faye-Lund48cfaea2010-11-04 01:35:17[diff] [blame]92 * Since stderr is set to buffered mode, the
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]93 * logging of different processes will not overlap
Erik Faye-Lund48cfaea2010-11-04 01:35:17[diff] [blame]94 * unless they overflow the (rather big) buffers.
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]95 */
David Soria Parra85e72832008-08-31 12:09:39[diff] [blame]96 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]97 vfprintf(stderr, err, params);
98 fputc('\n', stderr);
Erik Faye-Lund48cfaea2010-11-04 01:35:17[diff] [blame]99 fflush(stderr);
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]100 break;
101 case LOG_DESTINATION_NONE:
102 break;
103 case LOG_DESTINATION_UNSET:
104 BUG("log destination not initialized correctly");
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]105 }
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]106}
107
Tarmigan Casebolt28bea9e2009-11-14 21:33:13[diff] [blame]108__attribute__((format (printf, 1, 2)))
Pavel Roskincdda4742005-09-29 20:53:14[diff] [blame]109static void logerror(const char *err, ...)
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]110{
111 va_list params;
112 va_start(params, err);
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]113 logreport(LOG_ERR, err, params);
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]114 va_end(params);
115}
116
Tarmigan Casebolt28bea9e2009-11-14 21:33:13[diff] [blame]117__attribute__((format (printf, 1, 2)))
Pavel Roskincdda4742005-09-29 20:53:14[diff] [blame]118static void loginfo(const char *err, ...)
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]119{
120 va_list params;
121 if (!verbose)
122 return;
123 va_start(params, err);
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]124 logreport(LOG_INFO, err, params);
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]125 va_end(params);
126}
127
Matthias Lederhoferad8b4f52006-07-13 10:02:29[diff] [blame]128static void NORETURN daemon_die(const char *err, va_list params)
129{
130 logreport(LOG_ERR, err, params);
131 exit(1);
132}
133
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]134struct expand_path_context {
135 const char *directory;
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]136 struct hostinfo *hostinfo;
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]137};
138
139static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
140{
141 struct expand_path_context *context = ctx;
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]142 struct hostinfo *hi = context->hostinfo;
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]143
144 switch (placeholder[0]) {
145 case 'H':
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]146 strbuf_addbuf(sb, &hi->hostname);
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]147 return 1;
148 case 'C':
149 if (placeholder[1] == 'H') {
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]150 strbuf_addstr(sb, get_canon_hostname(hi));
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]151 return 2;
152 }
153 break;
154 case 'I':
155 if (placeholder[1] == 'P') {
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]156 strbuf_addstr(sb, get_ip_address(hi));
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]157 return 2;
158 }
159 break;
160 case 'P':
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]161 strbuf_addbuf(sb, &hi->tcp_port);
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]162 return 1;
163 case 'D':
164 strbuf_addstr(sb, context->directory);
165 return 1;
166 }
167 return 0;
168}
169
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]170static const char *path_ok(const char *directory, struct hostinfo *hi)
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]171{
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]172 static char rpath[PATH_MAX];
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]173 static char interp_path[PATH_MAX];
Jeff King6bdb0082016-10-22 04:59:38[diff] [blame]174 size_t rlen;
Erik Faye-Lund1c64b482011-10-04 20:02:00[diff] [blame]175 const char *path;
Jeff King1055a892014-06-18 19:41:58[diff] [blame]176 const char *dir;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]177
René Scharfe9d7ca662008-11-22 23:15:01[diff] [blame]178 dir = directory;
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]179
Shawn O. Pearce34b6cb82009-11-09 19:26:43[diff] [blame]180 if (daemon_avoid_alias(dir)) {
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]181 logerror("'%s': aliased", dir);
182 return NULL;
183 }
184
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]185 if (*dir == '~') {
186 if (!user_path) {
187 logerror("'%s': User-path not allowed", dir);
188 return NULL;
189 }
190 if (*user_path) {
191 /* Got either "~alice" or "~alice/foo";
192 * rewrite them to "~alice/%s" or
193 * "~alice/%s/foo".
194 */
195 int namlen, restlen = strlen(dir);
Jeff King1055a892014-06-18 19:41:58[diff] [blame]196 const char *slash = strchr(dir, '/');
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]197 if (!slash)
198 slash = dir + restlen;
199 namlen = slash - dir;
200 restlen -= namlen;
201 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
Jeff King6bdb0082016-10-22 04:59:38[diff] [blame]202 rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
203 namlen, dir, user_path, restlen, slash);
204 if (rlen >= sizeof(rpath)) {
205 logerror("user-path too large: %s", rpath);
206 return NULL;
207 }
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]208 dir = rpath;
209 }
210 }
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]211 else if (interpolated_path && hi->saw_extended_args) {
René Scharfe9d7ca662008-11-22 23:15:01[diff] [blame]212 struct strbuf expanded_path = STRBUF_INIT;
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]213 struct expand_path_context context;
René Scharfe9d7ca662008-11-22 23:15:01[diff] [blame]214
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]215 context.directory = directory;
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]216 context.hostinfo = hi;
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]217
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]218 if (*dir != '/') {
219 /* Allow only absolute */
220 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
221 return NULL;
222 }
223
René Scharfe9d7ca662008-11-22 23:15:01[diff] [blame]224 strbuf_expand(&expanded_path, interpolated_path,
René Scharfedc8edc82015-02-15 18:33:52[diff] [blame]225 expand_path, &context);
Jeff King6bdb0082016-10-22 04:59:38[diff] [blame]226
227 rlen = strlcpy(interp_path, expanded_path.buf,
228 sizeof(interp_path));
229 if (rlen >= sizeof(interp_path)) {
230 logerror("interpolated path too large: %s",
231 interp_path);
232 return NULL;
233 }
234
René Scharfe9d7ca662008-11-22 23:15:01[diff] [blame]235 strbuf_release(&expanded_path);
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]236 loginfo("Interpolated dir '%s'", interp_path);
237
238 dir = interp_path;
239 }
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]240 else if (base_path) {
241 if (*dir != '/') {
242 /* Allow only absolute */
Mark Wooding1fda3d52006-02-03 20:27:02[diff] [blame]243 logerror("'%s': Non-absolute path denied (base-path active)", dir);
Petr Baudisb21c31c2005-12-23 01:27:40[diff] [blame]244 return NULL;
245 }
Jeff King6bdb0082016-10-22 04:59:38[diff] [blame]246 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
247 if (rlen >= sizeof(rpath)) {
248 logerror("base-path too large: %s", rpath);
249 return NULL;
250 }
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]251 dir = rpath;
Petr Baudisb21c31c2005-12-23 01:27:40[diff] [blame]252 }
253
René Scharfea5839712008-12-26 10:01:57[diff] [blame]254 path = enter_repo(dir, strict_paths);
255 if (!path && base_path && base_path_relaxed) {
Jens Axboe73a7a652007-07-27 21:00:29[diff] [blame]256 /*
257 * if we fail and base_path_relaxed is enabled, try without
258 * prefixing the base path
259 */
René Scharfea5839712008-12-26 10:01:57[diff] [blame]260 dir = directory;
261 path = enter_repo(dir, strict_paths);
262 }
H. Peter Anvin3e04c622005-10-19 01:26:52[diff] [blame]263
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]264 if (!path) {
Jeff King05ac6b32009-03-04 08:32:29[diff] [blame]265 logerror("'%s' does not appear to be a git repository", dir);
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]266 return NULL;
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]267 }
268
269 if ( ok_paths && *ok_paths ) {
Jeff King3f2e2292016-07-01 05:58:58[diff] [blame]270 const char **pp;
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]271 int pathlen = strlen(path);
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]272
Junio C Hamanoce335fe2005-11-21 09:21:18[diff] [blame]273 /* The validation is done on the paths after enter_repo
Junio C Hamanoa6080a02007-06-07 07:04:01[diff] [blame]274 * appends optional {.git,.git/.git} and friends, but
Junio C Hamanod79374c2005-12-03 09:45:57[diff] [blame]275 * it does not use getcwd(). So if your /pub is
276 * a symlink to /mnt/pub, you can whitelist /pub and
277 * do not have to say /mnt/pub.
278 * Do not say /pub/.
Junio C Hamanoce335fe2005-11-21 09:21:18[diff] [blame]279 */
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]280 for ( pp = ok_paths ; *pp ; pp++ ) {
281 int len = strlen(*pp);
Junio C Hamanoce335fe2005-11-21 09:21:18[diff] [blame]282 if (len <= pathlen &&
283 !memcmp(*pp, path, len) &&
284 (path[len] == '\0' ||
285 (!strict_paths && path[len] == '/')))
286 return path;
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]287 }
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]288 }
289 else {
290 /* be backwards compatible */
291 if (!strict_paths)
292 return path;
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]293 }
294
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]295 logerror("'%s': not in whitelist", path);
296 return NULL; /* Fallthrough. Deny by default */
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]297}
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]298
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]299typedef int (*daemon_service_fn)(const struct argv_array *env);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]300struct daemon_service {
301 const char *name;
302 const char *config_name;
303 daemon_service_fn fn;
304 int enabled;
305 int overridable;
306};
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]307
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]308static int daemon_error(const char *dir, const char *msg)
309{
310 if (!informative_errors)
311 msg = "access denied or repository not exported";
Lars Schneider81c634e2016-10-16 23:20:29[diff] [blame]312 packet_write_fmt(1, "ERR %s: %s", msg, dir);
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]313 return -1;
314}
315
Jeff King1055a892014-06-18 19:41:58[diff] [blame]316static const char *access_hook;
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]317
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]318static int run_access_hook(struct daemon_service *service, const char *dir,
319 const char *path, struct hostinfo *hi)
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]320{
René Scharfed3180272014-08-19 19:09:35[diff] [blame]321 struct child_process child = CHILD_PROCESS_INIT;
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]322 struct strbuf buf = STRBUF_INIT;
323 const char *argv[8];
324 const char **arg = argv;
325 char *eol;
326 int seen_errors = 0;
327
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]328 *arg++ = access_hook;
329 *arg++ = service->name;
330 *arg++ = path;
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]331 *arg++ = hi->hostname.buf;
332 *arg++ = get_canon_hostname(hi);
333 *arg++ = get_ip_address(hi);
334 *arg++ = hi->tcp_port.buf;
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]335 *arg = NULL;
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]336
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]337 child.use_shell = 1;
338 child.argv = argv;
339 child.no_stdin = 1;
340 child.no_stderr = 1;
341 child.out = -1;
342 if (start_command(&child)) {
343 logerror("daemon access hook '%s' failed to start",
344 access_hook);
345 goto error_return;
346 }
347 if (strbuf_read(&buf, child.out, 0) < 0) {
348 logerror("failed to read from pipe to daemon access hook '%s'",
349 access_hook);
350 strbuf_reset(&buf);
351 seen_errors = 1;
352 }
353 if (close(child.out) < 0) {
354 logerror("failed to close pipe to daemon access hook '%s'",
355 access_hook);
356 seen_errors = 1;
357 }
358 if (finish_command(&child))
359 seen_errors = 1;
360
361 if (!seen_errors) {
362 strbuf_release(&buf);
363 return 0;
364 }
365
366error_return:
367 strbuf_ltrim(&buf);
368 if (!buf.len)
369 strbuf_addstr(&buf, "service rejected");
370 eol = strchr(buf.buf, '\n');
371 if (eol)
372 *eol = '\0';
373 errno = EACCES;
374 daemon_error(dir, buf.buf);
375 strbuf_release(&buf);
376 return -1;
377}
378
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]379static int run_service(const char *dir, struct daemon_service *service,
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]380 struct hostinfo *hi, const struct argv_array *env)
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]381{
382 const char *path;
383 int enabled = service->enabled;
Tanay Abhra8939d322014-08-07 16:21:16[diff] [blame]384 struct strbuf var = STRBUF_INIT;
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]385
René Scharfea47551c2008-11-22 23:21:52[diff] [blame]386 loginfo("Request %s for '%s'", service->name, dir);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]387
388 if (!enabled && !service->overridable) {
389 logerror("'%s': service not enabled.", service->name);
390 errno = EACCES;
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]391 return daemon_error(dir, "service not enabled");
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]392 }
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]393
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]394 if (!(path = path_ok(dir, hi)))
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]395 return daemon_error(dir, "no such repository");
H. Peter Anvin47888f02005-09-27 15:49:40[diff] [blame]396
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]397 /*
398 * Security on the cheap.
399 *
Junio C Hamanoa935c392005-10-21 06:19:36[diff] [blame]400 * We want a readable HEAD, usable "objects" directory, and
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]401 * a "git-daemon-export-ok" flag that says that the other side
402 * is ok with us doing this.
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]403 *
404 * path_ok() uses enter_repo() and does whitelist checking.
405 * We only need to make sure the repository is exported.
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]406 */
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]407
H. Peter Anvin3e04c622005-10-19 01:26:52[diff] [blame]408 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]409 logerror("'%s': repository not exported.", path);
H. Peter Anvin3e04c622005-10-19 01:26:52[diff] [blame]410 errno = EACCES;
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]411 return daemon_error(dir, "repository not exported");
H. Peter Anvin3e04c622005-10-19 01:26:52[diff] [blame]412 }
413
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]414 if (service->overridable) {
Tanay Abhra8939d322014-08-07 16:21:16[diff] [blame]415 strbuf_addf(&var, "daemon.%s", service->config_name);
416 git_config_get_bool(var.buf, &enabled);
417 strbuf_release(&var);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]418 }
419 if (!enabled) {
420 logerror("'%s': service not enabled for '%s'",
421 service->name, path);
422 errno = EACCES;
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]423 return daemon_error(dir, "service not enabled");
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]424 }
425
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]426 /*
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]427 * Optionally, a hook can choose to deny access to the
428 * repository depending on the phase of the moon.
429 */
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]430 if (access_hook && run_access_hook(service, dir, path, hi))
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]431 return -1;
432
433 /*
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]434 * We'll ignore SIGTERM from now on, we have a
435 * good client.
436 */
437 signal(SIGTERM, SIG_IGN);
438
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]439 return service->fn(env);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]440}
441
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]442static void copy_to_log(int fd)
443{
444 struct strbuf line = STRBUF_INIT;
445 FILE *fp;
446
447 fp = fdopen(fd, "r");
448 if (fp == NULL) {
449 logerror("fdopen of error channel failed");
450 close(fd);
451 return;
452 }
453
Junio C Hamano8f309ae2016-01-13 23:31:17[diff] [blame]454 while (strbuf_getline_lf(&line, fp) != EOF) {
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]455 logerror("%s", line.buf);
456 strbuf_setlen(&line, 0);
457 }
458
459 strbuf_release(&line);
460 fclose(fp);
461}
462
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]463static int run_service_command(struct child_process *cld)
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]464{
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]465 argv_array_push(&cld->args, ".");
466 cld->git_cmd = 1;
467 cld->err = -1;
468 if (start_command(cld))
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]469 return -1;
470
471 close(0);
472 close(1);
473
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]474 copy_to_log(cld->err);
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]475
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]476 return finish_command(cld);
Johannes Sixt5d87dd42009-06-14 20:38:51[diff] [blame]477}
478
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]479static int upload_pack(const struct argv_array *env)
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]480{
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]481 struct child_process cld = CHILD_PROCESS_INIT;
482 argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
483 argv_array_pushf(&cld.args, "--timeout=%u", timeout);
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]484
485 argv_array_pushv(&cld.env_array, env->argv);
486
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]487 return run_service_command(&cld);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]488}
489
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]490static int upload_archive(const struct argv_array *env)
Franck Bui-Huu39345a22006-09-07 13:12:05[diff] [blame]491{
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]492 struct child_process cld = CHILD_PROCESS_INIT;
493 argv_array_push(&cld.args, "upload-archive");
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]494
495 argv_array_pushv(&cld.env_array, env->argv);
496
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]497 return run_service_command(&cld);
Franck Bui-Huu39345a22006-09-07 13:12:05[diff] [blame]498}
499
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]500static int receive_pack(const struct argv_array *env)
Linus Torvalds4b3b1e12007-01-21 19:04:13[diff] [blame]501{
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]502 struct child_process cld = CHILD_PROCESS_INIT;
503 argv_array_push(&cld.args, "receive-pack");
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]504
505 argv_array_pushv(&cld.env_array, env->argv);
506
Jeff King6a97da32017-03-28 19:48:10[diff] [blame]507 return run_service_command(&cld);
Linus Torvalds4b3b1e12007-01-21 19:04:13[diff] [blame]508}
509
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]510static struct daemon_service daemon_service[] = {
Franck Bui-Huu39345a22006-09-07 13:12:05[diff] [blame]511 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]512 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
Linus Torvalds4b3b1e12007-01-21 19:04:13[diff] [blame]513 { "receive-pack", "receivepack", receive_pack, 0, 1 },
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]514};
515
Junio C Hamanof3fa1832007-11-08 23:35:32[diff] [blame]516static void enable_service(const char *name, int ena)
517{
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]518 int i;
519 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
520 if (!strcmp(daemon_service[i].name, name)) {
521 daemon_service[i].enabled = ena;
522 return;
523 }
524 }
525 die("No such service %s", name);
526}
527
Junio C Hamanof3fa1832007-11-08 23:35:32[diff] [blame]528static void make_service_overridable(const char *name, int ena)
529{
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]530 int i;
531 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
532 if (!strcmp(daemon_service[i].name, name)) {
533 daemon_service[i].overridable = ena;
534 return;
535 }
536 }
537 die("No such service %s", name);
538}
539
Ilari Liusvaarae8dbd762010-01-26 18:24:41[diff] [blame]540static void parse_host_and_port(char *hostport, char **host,
541 char **port)
542{
543 if (*hostport == '[') {
544 char *end;
545
546 end = strchr(hostport, ']');
547 if (!end)
Junio C Hamano9517e6b2010-02-04 05:23:18[diff] [blame]548 die("Invalid request ('[' without ']')");
Ilari Liusvaarae8dbd762010-01-26 18:24:41[diff] [blame]549 *end = '\0';
550 *host = hostport + 1;
551 if (!end[1])
552 *port = NULL;
553 else if (end[1] == ':')
554 *port = end + 2;
555 else
556 die("Garbage after end of host part");
557 } else {
558 *host = hostport;
559 *port = strrchr(hostport, ':');
560 if (*port) {
Imre Deake9bd3232010-03-20 02:23:58[diff] [blame]561 **port = '\0';
Ilari Liusvaarae8dbd762010-01-26 18:24:41[diff] [blame]562 ++*port;
563 }
564 }
565}
566
Jon Loeligereb30aed2006-09-27 16:16:10[diff] [blame]567/*
Jeff Kingb4853732015-02-17 19:09:24[diff] [blame]568 * Sanitize a string from the client so that it's OK to be inserted into a
569 * filesystem path. Specifically, we disallow slashes, runs of "..", and
570 * trailing and leading dots, which means that the client cannot escape
571 * our base path via ".." traversal.
572 */
René Scharfe7a646ce2015-03-07 10:50:29[diff] [blame]573static void sanitize_client(struct strbuf *out, const char *in)
Jeff Kingb4853732015-02-17 19:09:24[diff] [blame]574{
575 for (; *in; in++) {
576 if (*in == '/')
577 continue;
578 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
579 continue;
580 strbuf_addch(out, *in);
581 }
582
583 while (out->len && out->buf[out->len - 1] == '.')
584 strbuf_setlen(out, out->len - 1);
585}
586
Jeff Kingb4853732015-02-17 19:09:24[diff] [blame]587/*
588 * Like sanitize_client, but we also perform any canonicalization
589 * to make life easier on the admin.
590 */
René Scharfe7a646ce2015-03-07 10:50:29[diff] [blame]591static void canonicalize_client(struct strbuf *out, const char *in)
Jeff Kingb4853732015-02-17 19:09:24[diff] [blame]592{
René Scharfe7a646ce2015-03-07 10:50:29[diff] [blame]593 sanitize_client(out, in);
594 strbuf_tolower(out);
Jeff Kingb4853732015-02-17 19:09:24[diff] [blame]595}
596
597/*
Shawn O. Pearce73bb33a2009-06-05 01:33:32[diff] [blame]598 * Read the host as supplied by the client connection.
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]599 *
600 * Returns a pointer to the character after the NUL byte terminating the host
601 * arguemnt, or 'extra_args' if there is no host arguemnt.
Jon Loeligereb30aed2006-09-27 16:16:10[diff] [blame]602 */
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]603static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]604{
605 char *val;
606 int vallen;
607 char *end = extra_args + buflen;
608
Shawn O. Pearce73bb33a2009-06-05 01:33:32[diff] [blame]609 if (extra_args < end && *extra_args) {
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]610 hi->saw_extended_args = 1;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]611 if (strncasecmp("host=", extra_args, 5) == 0) {
612 val = extra_args + 5;
613 vallen = strlen(val) + 1;
Jeff King550fbca2018-01-25 00:56:20[diff] [blame]614 loginfo("Extended attribute \"host\": %s", val);
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]615 if (*val) {
Jon Loeligereb30aed2006-09-27 16:16:10[diff] [blame]616 /* Split <host>:<port> at colon. */
Ilari Liusvaarae8dbd762010-01-26 18:24:41[diff] [blame]617 char *host;
618 char *port;
619 parse_host_and_port(val, &host, &port);
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]620 if (port)
621 sanitize_client(&hi->tcp_port, port);
622 canonicalize_client(&hi->hostname, host);
623 hi->hostname_lookup_done = 0;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]624 }
Jon Loeligereb30aed2006-09-27 16:16:10[diff] [blame]625
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]626 /* On to the next one */
627 extra_args = val + vallen;
628 }
Shawn O. Pearce73bb33a2009-06-05 01:33:32[diff] [blame]629 if (extra_args < end && *extra_args)
630 die("Invalid request");
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]631 }
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]632
633 return extra_args;
634}
635
636static void parse_extra_args(struct hostinfo *hi, struct argv_array *env,
637 char *extra_args, int buflen)
638{
639 const char *end = extra_args + buflen;
640 struct strbuf git_protocol = STRBUF_INIT;
641
642 /* First look for the host argument */
643 extra_args = parse_host_arg(hi, extra_args, buflen);
644
645 /* Look for additional arguments places after a second NUL byte */
646 for (; extra_args < end; extra_args += strlen(extra_args) + 1) {
647 const char *arg = extra_args;
648
649 /*
650 * Parse the extra arguments, adding most to 'git_protocol'
651 * which will be used to set the 'GIT_PROTOCOL' envvar in the
652 * service that will be run.
653 *
654 * If there ends up being a particular arg in the future that
655 * git-daemon needs to parse specificly (like the 'host' arg)
656 * then it can be parsed here and not added to 'git_protocol'.
657 */
658 if (*arg) {
659 if (git_protocol.len > 0)
660 strbuf_addch(&git_protocol, ':');
661 strbuf_addstr(&git_protocol, arg);
662 }
663 }
664
Jeff King550fbca2018-01-25 00:56:20[diff] [blame]665 if (git_protocol.len > 0) {
666 loginfo("Extended attribute \"protocol\": %s", git_protocol.buf);
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]667 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s",
668 git_protocol.buf);
Jeff King550fbca2018-01-25 00:56:20[diff] [blame]669 }
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]670 strbuf_release(&git_protocol);
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]671}
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]672
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]673/*
674 * Locate canonical hostname and its IP address.
675 */
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]676static void lookup_hostname(struct hostinfo *hi)
René Scharfeedef9532015-02-15 18:31:41[diff] [blame]677{
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]678 if (!hi->hostname_lookup_done && hi->hostname.len) {
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]679#ifndef NO_IPV6
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]680 struct addrinfo hints;
Benjamin Kramer3e8a00a2009-04-27 13:59:49[diff] [blame]681 struct addrinfo *ai;
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]682 int gai;
683 static char addrbuf[HOST_NAME_MAX + 1];
684
685 memset(&hints, 0, sizeof(hints));
686 hints.ai_flags = AI_CANONNAME;
687
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]688 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]689 if (!gai) {
Benjamin Kramer3e8a00a2009-04-27 13:59:49[diff] [blame]690 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]691
Benjamin Kramer3e8a00a2009-04-27 13:59:49[diff] [blame]692 inet_ntop(AF_INET, &sin_addr->sin_addr,
693 addrbuf, sizeof(addrbuf));
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]694 strbuf_addstr(&hi->ip_address, addrbuf);
Benjamin Kramer3e8a00a2009-04-27 13:59:49[diff] [blame]695
René Scharfe7a646ce2015-03-07 10:50:29[diff] [blame]696 if (ai->ai_canonname)
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]697 sanitize_client(&hi->canon_hostname,
René Scharfe7a646ce2015-03-07 10:50:29[diff] [blame]698 ai->ai_canonname);
699 else
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]700 strbuf_addbuf(&hi->canon_hostname,
701 &hi->ip_address);
Benjamin Kramer3e8a00a2009-04-27 13:59:49[diff] [blame]702
703 freeaddrinfo(ai);
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]704 }
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]705#else
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]706 struct hostent *hent;
707 struct sockaddr_in sa;
708 char **ap;
709 static char addrbuf[HOST_NAME_MAX + 1];
710
Junio C Hamanod358f772015-05-05 18:03:24[diff] [blame]711 hent = gethostbyname(hi->hostname.buf);
René Scharfeeb6c4032014-10-01 10:16:17[diff] [blame]712 if (hent) {
713 ap = hent->h_addr_list;
714 memset(&sa, 0, sizeof sa);
715 sa.sin_family = hent->h_addrtype;
716 sa.sin_port = htons(0);
717 memcpy(&sa.sin_addr, *ap, hent->h_length);
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]718
René Scharfeeb6c4032014-10-01 10:16:17[diff] [blame]719 inet_ntop(hent->h_addrtype, &sa.sin_addr,
720 addrbuf, sizeof(addrbuf));
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]721
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]722 sanitize_client(&hi->canon_hostname, hent->h_name);
723 strbuf_addstr(&hi->ip_address, addrbuf);
René Scharfeeb6c4032014-10-01 10:16:17[diff] [blame]724 }
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]725#endif
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]726 hi->hostname_lookup_done = 1;
René Scharfe6720e952008-12-26 10:12:15[diff] [blame]727 }
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]728}
729
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]730static void hostinfo_init(struct hostinfo *hi)
731{
732 memset(hi, 0, sizeof(*hi));
733 strbuf_init(&hi->hostname, 0);
734 strbuf_init(&hi->canon_hostname, 0);
735 strbuf_init(&hi->ip_address, 0);
736 strbuf_init(&hi->tcp_port, 0);
737}
738
739static void hostinfo_clear(struct hostinfo *hi)
740{
741 strbuf_release(&hi->hostname);
742 strbuf_release(&hi->canon_hostname);
743 strbuf_release(&hi->ip_address);
744 strbuf_release(&hi->tcp_port);
745}
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]746
Eric Wonga43b68a2016-05-25 03:15:05[diff] [blame]747static void set_keep_alive(int sockfd)
748{
749 int ka = 1;
750
Eric Wong49c58d82016-07-18 04:59:11[diff] [blame]751 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
752 if (errno != ENOTSOCK)
753 logerror("unable to set SO_KEEPALIVE on socket: %s",
754 strerror(errno));
755 }
Eric Wonga43b68a2016-05-25 03:15:05[diff] [blame]756}
757
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]758static int execute(void)
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]759{
Jeff King74543a02013-02-20 20:02:57[diff] [blame]760 char *line = packet_buffer;
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]761 int pktlen, len, i;
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]762 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]763 struct hostinfo hi;
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]764 struct argv_array env = ARGV_ARRAY_INIT;
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]765
766 hostinfo_init(&hi);
Linus Torvalds7d806942005-07-15 16:27:05[diff] [blame]767
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]768 if (addr)
769 loginfo("Connection from %s:%s", addr, port);
David Woodhouse5b276ee2006-06-20 14:38:13[diff] [blame]770
Eric Wonga43b68a2016-05-25 03:15:05[diff] [blame]771 set_keep_alive(0);
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]772 alarm(init_timeout ? init_timeout : timeout);
Jeff King4981fe72013-02-23 22:31:34[diff] [blame]773 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]774 alarm(0);
Linus Torvalds7d806942005-07-15 16:27:05[diff] [blame]775
Jon Loeliger5ad312b2006-06-07 03:58:41[diff] [blame]776 len = strlen(line);
Jeff Kinged15e582018-01-25 00:58:54[diff] [blame]777 if (len && line[len-1] == '\n')
778 line[len-1] = 0;
Linus Torvalds7d806942005-07-15 16:27:05[diff] [blame]779
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]780 /* parse additional args hidden behind a NUL byte */
René Scharfed433ed02008-11-22 23:19:09[diff] [blame]781 if (len != pktlen)
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]782 parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1);
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]783
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]784 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
785 struct daemon_service *s = &(daemon_service[i]);
Jeff Kingd12c24d2014-06-18 19:49:44[diff] [blame]786 const char *arg;
787
788 if (skip_prefix(line, "git-", &arg) &&
789 skip_prefix(arg, s->name, &arg) &&
790 *arg++ == ' ') {
Jon Loeligereb30aed2006-09-27 16:16:10[diff] [blame]791 /*
792 * Note: The directory here is probably context sensitive,
793 * and might depend on the actual service being performed.
794 */
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]795 int rc = run_service(arg, s, &hi, &env);
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]796 hostinfo_clear(&hi);
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]797 argv_array_clear(&env);
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]798 return rc;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]799 }
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]800 }
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]801
René Scharfe01cec542015-03-07 10:50:37[diff] [blame]802 hostinfo_clear(&hi);
Brandon Williamsdfe422d2017-10-16 17:55:25[diff] [blame]803 argv_array_clear(&env);
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]804 logerror("Protocol error: '%s'", line);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]805 return -1;
806}
807
Erik Faye-Lund15515b72010-01-09 14:13:28[diff] [blame]808static int addrcmp(const struct sockaddr_storage *s1,
809 const struct sockaddr_storage *s2)
810{
Brandon Casey3aff8742010-03-15 22:10:06[diff] [blame]811 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
812 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
813
814 if (sa1->sa_family != sa2->sa_family)
815 return sa1->sa_family - sa2->sa_family;
816 if (sa1->sa_family == AF_INET)
Erik Faye-Lund15515b72010-01-09 14:13:28[diff] [blame]817 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
818 &((struct sockaddr_in *)s2)->sin_addr,
819 sizeof(struct in_addr));
820#ifndef NO_IPV6
Brandon Casey3aff8742010-03-15 22:10:06[diff] [blame]821 if (sa1->sa_family == AF_INET6)
Erik Faye-Lund15515b72010-01-09 14:13:28[diff] [blame]822 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
823 &((struct sockaddr_in6 *)s2)->sin6_addr,
824 sizeof(struct in6_addr));
825#endif
826 return 0;
827}
828
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]829static int max_connections = 32;
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]830
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]831static unsigned int live_children;
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]832
Linus Torvalds4d8fa912005-08-01 19:11:53[diff] [blame]833static struct child {
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]834 struct child *next;
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]835 struct child_process cld;
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]836 struct sockaddr_storage address;
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]837} *firstborn;
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]838
Erik Faye-Lundc295cf02010-11-04 01:35:22[diff] [blame]839static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]840{
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]841 struct child *newborn, **cradle;
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]842
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]843 newborn = xcalloc(1, sizeof(*newborn));
844 live_children++;
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]845 memcpy(&newborn->cld, cld, sizeof(*cld));
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]846 memcpy(&newborn->address, addr, addrlen);
847 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
Erik Faye-Lund15515b72010-01-09 14:13:28[diff] [blame]848 if (!addrcmp(&(*cradle)->address, &newborn->address))
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]849 break;
850 newborn->next = *cradle;
851 *cradle = newborn;
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]852}
853
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]854/*
855 * This gets called if the number of connections grows
856 * past "max_connections".
857 *
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]858 * We kill the newest connection from a duplicate IP.
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]859 */
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]860static void kill_some_child(void)
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]861{
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]862 const struct child *blanket, *next;
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]863
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]864 if (!(blanket = firstborn))
865 return;
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]866
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]867 for (; (next = blanket->next); blanket = next)
Erik Faye-Lund15515b72010-01-09 14:13:28[diff] [blame]868 if (!addrcmp(&blanket->address, &next->address)) {
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]869 kill(blanket->cld.pid, SIGTERM);
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]870 break;
871 }
Linus Torvalds66e631d2005-07-16 04:51:57[diff] [blame]872}
873
Johannes Schindelina5a91262008-07-03 15:27:24[diff] [blame]874static void check_dead_children(void)
875{
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]876 int status;
877 pid_t pid;
Johannes Schindelina5a91262008-07-03 15:27:24[diff] [blame]878
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]879 struct child **cradle, *blanket;
880 for (cradle = &firstborn; (blanket = *cradle);)
881 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
882 const char *dead = "";
883 if (status)
884 dead = " (with error)";
885 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
886
887 /* remove the child */
888 *cradle = blanket->next;
889 live_children--;
René Scharfeb1b49ff2015-10-24 12:23:20[diff] [blame]890 child_process_clear(&blanket->cld);
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]891 free(blanket);
892 } else
893 cradle = &blanket->next;
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]894}
895
Jeff King850d2fe2016-02-22 22:44:21[diff] [blame]896static struct argv_array cld_argv = ARGV_ARRAY_INIT;
Erik Faye-Lundc295cf02010-11-04 01:35:22[diff] [blame]897static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]898{
René Scharfed3180272014-08-19 19:09:35[diff] [blame]899 struct child_process cld = CHILD_PROCESS_INIT;
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]900
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]901 if (max_connections && live_children >= max_connections) {
902 kill_some_child();
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]903 sleep(1); /* give it some time to die */
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]904 check_dead_children();
905 if (live_children >= max_connections) {
906 close(incoming);
907 logerror("Too many children, dropping connection");
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]908 return;
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]909 }
910 }
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]911
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]912 if (addr->sa_family == AF_INET) {
Jeff Kingf063d382015-09-24 21:08:00[diff] [blame]913 char buf[128] = "";
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]914 struct sockaddr_in *sin_addr = (void *) addr;
Jeff Kingf063d382015-09-24 21:08:00[diff] [blame]915 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
916 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
917 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
918 ntohs(sin_addr->sin_port));
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]919#ifndef NO_IPV6
Stefan Beller5d9cfa22013-07-14 21:35:46[diff] [blame]920 } else if (addr->sa_family == AF_INET6) {
Jeff Kingf063d382015-09-24 21:08:00[diff] [blame]921 char buf[128] = "";
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]922 struct sockaddr_in6 *sin6_addr = (void *) addr;
Jeff Kingf063d382015-09-24 21:08:00[diff] [blame]923 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
924 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
925 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
926 ntohs(sin6_addr->sin6_port));
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]927#endif
928 }
929
Jeff King850d2fe2016-02-22 22:44:21[diff] [blame]930 cld.argv = cld_argv.argv;
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]931 cld.in = incoming;
932 cld.out = dup(incoming);
Linus Torvalds02d57da2005-07-16 05:53:31[diff] [blame]933
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]934 if (start_command(&cld))
935 logerror("unable to fork");
936 else
937 add_child(&cld, addr, addrlen);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]938}
939
Linus Torvaldseaa94912005-07-16 03:42:28[diff] [blame]940static void child_handler(int signo)
941{
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]942 /*
943 * Otherwise empty handler because systemcalls will get interrupted
Stephen R. van den Berg695605b2008-08-14 18:02:20[diff] [blame]944 * upon signal receipt
945 * SysV needs the handler to be rearmed
946 */
Stephen R. van den Bergbd7b3712008-08-12 19:36:13[diff] [blame]947 signal(SIGCHLD, child_handler);
Linus Torvaldseaa94912005-07-16 03:42:28[diff] [blame]948}
949
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]950static int set_reuse_addr(int sockfd)
951{
952 int on = 1;
953
954 if (!reuseaddr)
955 return 0;
956 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
957 &on, sizeof(on));
958}
959
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]960struct socketlist {
961 int *list;
962 size_t nr;
963 size_t alloc;
964};
965
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]966static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
967{
968#ifdef NO_IPV6
969 static char ip[INET_ADDRSTRLEN];
970#else
971 static char ip[INET6_ADDRSTRLEN];
972#endif
973
974 switch (family) {
975#ifndef NO_IPV6
976 case AF_INET6:
977 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
978 break;
979#endif
980 case AF_INET:
981 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
982 break;
983 default:
Jeff King5096d492015-09-24 21:06:08[diff] [blame]984 xsnprintf(ip, sizeof(ip), "<unknown>");
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]985 }
986 return ip;
987}
988
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]989#ifndef NO_IPV6
990
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]991static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]992{
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]993 int socknum = 0;
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]994 char pbuf[NI_MAXSERV];
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]995 struct addrinfo hints, *ai0, *ai;
996 int gai;
Alexandre Julliard20276882007-02-14 17:10:26[diff] [blame]997 long flags;
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]998
Jeff King5096d492015-09-24 21:06:08[diff] [blame]999 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1000 memset(&hints, 0, sizeof(hints));
1001 hints.ai_family = AF_UNSPEC;
1002 hints.ai_socktype = SOCK_STREAM;
1003 hints.ai_protocol = IPPROTO_TCP;
1004 hints.ai_flags = AI_PASSIVE;
1005
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1006 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1007 if (gai) {
1008 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
1009 return 0;
1010 }
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1011
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1012 for (ai = ai0; ai; ai = ai->ai_next) {
1013 int sockfd;
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1014
1015 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1016 if (sockfd < 0)
1017 continue;
1018 if (sockfd >= FD_SETSIZE) {
Stephen R. van den Bergdf0daf82008-08-14 18:02:20[diff] [blame]1019 logerror("Socket descriptor too large");
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1020 close(sockfd);
1021 continue;
1022 }
1023
1024#ifdef IPV6_V6ONLY
1025 if (ai->ai_family == AF_INET6) {
1026 int on = 1;
1027 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
1028 &on, sizeof(on));
1029 /* Note: error is not fatal */
1030 }
1031#endif
1032
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1033 if (set_reuse_addr(sockfd)) {
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1034 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1035 close(sockfd);
Serge E. Hallyn0032d542006-04-18 13:11:06[diff] [blame]1036 continue;
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1037 }
1038
Eric Wonga43b68a2016-05-25 03:15:05[diff] [blame]1039 set_keep_alive(sockfd);
1040
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1041 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1042 logerror("Could not bind to %s: %s",
1043 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1044 strerror(errno));
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1045 close(sockfd);
1046 continue; /* not fatal */
1047 }
1048 if (listen(sockfd, 5) < 0) {
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1049 logerror("Could not listen to %s: %s",
1050 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1051 strerror(errno));
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1052 close(sockfd);
1053 continue; /* not fatal */
1054 }
1055
Alexandre Julliard20276882007-02-14 17:10:26[diff] [blame]1056 flags = fcntl(sockfd, F_GETFD, 0);
1057 if (flags >= 0)
1058 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1059
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1060 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1061 socklist->list[socklist->nr++] = sockfd;
1062 socknum++;
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1063 }
1064
1065 freeaddrinfo(ai0);
1066
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1067 return socknum;
1068}
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1069
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1070#else /* NO_IPV6 */
1071
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1072static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1073{
1074 struct sockaddr_in sin;
1075 int sockfd;
Alexandre Julliard20276882007-02-14 17:10:26[diff] [blame]1076 long flags;
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1077
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1078 memset(&sin, 0, sizeof sin);
1079 sin.sin_family = AF_INET;
1080 sin.sin_port = htons(listen_port);
1081
1082 if (listen_addr) {
1083 /* Well, host better be an IP address here. */
1084 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1085 return 0;
1086 } else {
1087 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1088 }
1089
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1090 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1091 if (sockfd < 0)
1092 return 0;
1093
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1094 if (set_reuse_addr(sockfd)) {
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1095 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1096 close(sockfd);
1097 return 0;
1098 }
1099
Eric Wonga43b68a2016-05-25 03:15:05[diff] [blame]1100 set_keep_alive(sockfd);
1101
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1102 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
René Scharfe9d1b9aa2014-10-01 10:18:15[diff] [blame]1103 logerror("Could not bind to %s: %s",
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1104 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1105 strerror(errno));
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1106 close(sockfd);
1107 return 0;
1108 }
1109
Paul Sericef35230f2005-11-21 17:07:23[diff] [blame]1110 if (listen(sockfd, 5) < 0) {
Nguyễn Thái Ngọc Duy089d82e2011-10-03 19:13:28[diff] [blame]1111 logerror("Could not listen to %s: %s",
1112 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1113 strerror(errno));
Paul Sericef35230f2005-11-21 17:07:23[diff] [blame]1114 close(sockfd);
1115 return 0;
1116 }
1117
Alexandre Julliard20276882007-02-14 17:10:26[diff] [blame]1118 flags = fcntl(sockfd, F_GETFD, 0);
1119 if (flags >= 0)
1120 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1121
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1122 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1123 socklist->list[socklist->nr++] = sockfd;
Paul Sericef35230f2005-11-21 17:07:23[diff] [blame]1124 return 1;
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1125}
1126
1127#endif
1128
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]1129static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1130{
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]1131 if (!listen_addr->nr)
1132 setup_named_sock(NULL, listen_port, socklist);
1133 else {
1134 int i, socknum;
1135 for (i = 0; i < listen_addr->nr; i++) {
1136 socknum = setup_named_sock(listen_addr->items[i].string,
1137 listen_port, socklist);
1138
1139 if (socknum == 0)
1140 logerror("unable to allocate any listen sockets for host %s on port %u",
1141 listen_addr->items[i].string, listen_port);
1142 }
1143 }
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1144}
1145
1146static int service_loop(struct socketlist *socklist)
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1147{
1148 struct pollfd *pfd;
1149 int i;
1150
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1151 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1152
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1153 for (i = 0; i < socklist->nr; i++) {
1154 pfd[i].fd = socklist->list[i];
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1155 pfd[i].events = POLLIN;
1156 }
H. Peter Anvin92202822005-09-30 18:01:57[diff] [blame]1157
1158 signal(SIGCHLD, child_handler);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1159
1160 for (;;) {
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1161 int i;
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1162
Stephen R. van den Berg695605b2008-08-14 18:02:20[diff] [blame]1163 check_dead_children();
1164
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1165 if (poll(pfd, socklist->nr, -1) < 0) {
Junio C Hamano1eef0b32005-07-26 20:26:52[diff] [blame]1166 if (errno != EINTR) {
Stephen R. van den Bergdf0daf82008-08-14 18:02:20[diff] [blame]1167 logerror("Poll failed, resuming: %s",
Junio C Hamano1eef0b32005-07-26 20:26:52[diff] [blame]1168 strerror(errno));
1169 sleep(1);
1170 }
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1171 continue;
1172 }
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1173
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1174 for (i = 0; i < socklist->nr; i++) {
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1175 if (pfd[i].revents & POLLIN) {
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]1176 union {
1177 struct sockaddr sa;
1178 struct sockaddr_in sai;
1179#ifndef NO_IPV6
1180 struct sockaddr_in6 sai6;
1181#endif
1182 } ss;
Erik Faye-Lundc295cf02010-11-04 01:35:22[diff] [blame]1183 socklen_t sslen = sizeof(ss);
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]1184 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1185 if (incoming < 0) {
1186 switch (errno) {
1187 case EAGAIN:
1188 case EINTR:
1189 case ECONNABORTED:
1190 continue;
1191 default:
Thomas Rastd824cbb2009-06-27 15:58:46[diff] [blame]1192 die_errno("accept returned");
YOSHIFUJI Hideakidf076bd2005-07-23 08:24:59[diff] [blame]1193 }
1194 }
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]1195 handle(incoming, &ss.sa, sslen);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1196 }
1197 }
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1198 }
1199}
1200
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1201#ifdef NO_POSIX_GOODIES
1202
1203struct credentials;
1204
1205static void drop_privileges(struct credentials *cred)
1206{
1207 /* nothing */
1208}
1209
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1210static struct credentials *prepare_credentials(const char *user_name,
1211 const char *group_name)
1212{
1213 die("--user not supported on this platform");
1214}
1215
1216#else
1217
1218struct credentials {
1219 struct passwd *pass;
1220 gid_t gid;
1221};
1222
1223static void drop_privileges(struct credentials *cred)
1224{
1225 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1226 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1227 die("cannot drop privileges");
1228}
1229
1230static struct credentials *prepare_credentials(const char *user_name,
1231 const char *group_name)
1232{
1233 static struct credentials c;
1234
1235 c.pass = getpwnam(user_name);
1236 if (!c.pass)
1237 die("user not found - %s", user_name);
1238
1239 if (!group_name)
1240 c.gid = c.pass->pw_gid;
1241 else {
1242 struct group *group = getgrnam(group_name);
1243 if (!group)
1244 die("group not found - %s", group_name);
1245
1246 c.gid = group->gr_gid;
1247 }
1248
1249 return &c;
1250}
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1251#endif
Matthias Lederhofera5262762006-07-13 16:47:13[diff] [blame]1252
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1253static int serve(struct string_list *listen_addr, int listen_port,
1254 struct credentials *cred)
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1255{
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1256 struct socketlist socklist = { NULL, 0, 0 };
Junio C Hamano4ae22d92005-10-21 06:21:50[diff] [blame]1257
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1258 socksetup(listen_addr, listen_port, &socklist);
1259 if (socklist.nr == 0)
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]1260 die("unable to allocate any listen sockets on port %u",
1261 listen_port);
Junio C Hamano4ae22d92005-10-21 06:21:50[diff] [blame]1262
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1263 drop_privileges(cred);
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1264
Clemens Buchacherf6a34cf2012-01-07 11:42:46[diff] [blame]1265 loginfo("Ready to rumble");
1266
Alexander Sulfrian2caa3212010-08-30 11:30:50[diff] [blame]1267 return service_loop(&socklist);
Junio C Hamano4ae22d92005-10-21 06:21:50[diff] [blame]1268}
Peter Anvin6573faf2005-09-29 00:26:44[diff] [blame]1269
Jeff King3f2e2292016-07-01 05:58:58[diff] [blame]1270int cmd_main(int argc, const char **argv)
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1271{
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1272 int listen_port = 0;
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]1273 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]1274 int serve_mode = 0, inetd_mode = 0;
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1275 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
Matthias Lederhofera5262762006-07-13 16:47:13[diff] [blame]1276 int detach = 0;
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1277 struct credentials *cred = NULL;
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1278 int i;
1279
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1280 for (i = 1; i < argc; i++) {
Jeff King3f2e2292016-07-01 05:58:58[diff] [blame]1281 const char *arg = argv[i];
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1282 const char *v;
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1283
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1284 if (skip_prefix(arg, "--listen=", &v)) {
1285 string_list_append(&listen_addr, xstrdup_tolower(v));
René Scharfe6720e952008-12-26 10:12:15[diff] [blame]1286 continue;
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1287 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1288 if (skip_prefix(arg, "--port=", &v)) {
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1289 char *end;
1290 unsigned long n;
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1291 n = strtoul(v, &end, 0);
1292 if (*v && !*end) {
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1293 listen_port = n;
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1294 continue;
1295 }
1296 }
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]1297 if (!strcmp(arg, "--serve")) {
1298 serve_mode = 1;
1299 continue;
1300 }
Linus Torvaldse64e1b72005-07-15 16:32:16[diff] [blame]1301 if (!strcmp(arg, "--inetd")) {
1302 inetd_mode = 1;
Linus Torvaldse64e1b72005-07-15 16:32:16[diff] [blame]1303 continue;
1304 }
Petr Baudisf8ff0c02005-09-22 09:25:28[diff] [blame]1305 if (!strcmp(arg, "--verbose")) {
1306 verbose = 1;
1307 continue;
1308 }
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]1309 if (!strcmp(arg, "--syslog")) {
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]1310 log_destination = LOG_DESTINATION_SYSLOG;
Petr Baudis9048fe12005-09-24 14:13:01[diff] [blame]1311 continue;
1312 }
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]1313 if (skip_prefix(arg, "--log-destination=", &v)) {
1314 if (!strcmp(v, "syslog")) {
1315 log_destination = LOG_DESTINATION_SYSLOG;
1316 continue;
1317 } else if (!strcmp(v, "stderr")) {
1318 log_destination = LOG_DESTINATION_STDERR;
1319 continue;
1320 } else if (!strcmp(v, "none")) {
1321 log_destination = LOG_DESTINATION_NONE;
1322 continue;
1323 } else
1324 die("unknown log destination '%s'", v);
1325 }
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]1326 if (!strcmp(arg, "--export-all")) {
1327 export_all_trees = 1;
1328 continue;
1329 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1330 if (skip_prefix(arg, "--access-hook=", &v)) {
1331 access_hook = v;
Junio C Hamano93741e42012-08-14 18:37:51[diff] [blame]1332 continue;
1333 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1334 if (skip_prefix(arg, "--timeout=", &v)) {
1335 timeout = atoi(v);
Andreas Ericssona8883282005-11-16 23:38:29[diff] [blame]1336 continue;
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]1337 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1338 if (skip_prefix(arg, "--init-timeout=", &v)) {
1339 init_timeout = atoi(v);
Andreas Ericssona8883282005-11-16 23:38:29[diff] [blame]1340 continue;
H. Peter Anvin960decc2005-10-19 21:27:01[diff] [blame]1341 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1342 if (skip_prefix(arg, "--max-connections=", &v)) {
1343 max_connections = atoi(v);
Stephen R. van den Berg3bd62c22008-08-14 18:02:20[diff] [blame]1344 if (max_connections < 0)
1345 max_connections = 0; /* unlimited */
1346 continue;
1347 }
Andreas Ericsson4dbd1352005-11-17 19:37:14[diff] [blame]1348 if (!strcmp(arg, "--strict-paths")) {
1349 strict_paths = 1;
1350 continue;
1351 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1352 if (skip_prefix(arg, "--base-path=", &v)) {
1353 base_path = v;
Petr Baudisb21c31c2005-12-23 01:27:40[diff] [blame]1354 continue;
1355 }
Jens Axboe73a7a652007-07-27 21:00:29[diff] [blame]1356 if (!strcmp(arg, "--base-path-relaxed")) {
1357 base_path_relaxed = 1;
1358 continue;
1359 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1360 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1361 interpolated_path = v;
Jon Loeliger49ba83f2006-09-20 01:31:51[diff] [blame]1362 continue;
1363 }
Mark Wooding1955fab2006-02-03 20:27:04[diff] [blame]1364 if (!strcmp(arg, "--reuseaddr")) {
1365 reuseaddr = 1;
1366 continue;
1367 }
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]1368 if (!strcmp(arg, "--user-path")) {
1369 user_path = "";
1370 continue;
1371 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1372 if (skip_prefix(arg, "--user-path=", &v)) {
1373 user_path = v;
Junio C Hamano603968d2006-02-05 06:27:29[diff] [blame]1374 continue;
1375 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1376 if (skip_prefix(arg, "--pid-file=", &v)) {
1377 pid_file = v;
Matthias Lederhofer45ed5d72006-07-13 10:18:08[diff] [blame]1378 continue;
1379 }
Matthias Lederhofera5262762006-07-13 16:47:13[diff] [blame]1380 if (!strcmp(arg, "--detach")) {
1381 detach = 1;
Matthias Lederhofera5262762006-07-13 16:47:13[diff] [blame]1382 continue;
1383 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1384 if (skip_prefix(arg, "--user=", &v)) {
1385 user_name = v;
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1386 continue;
1387 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1388 if (skip_prefix(arg, "--group=", &v)) {
1389 group_name = v;
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1390 continue;
1391 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1392 if (skip_prefix(arg, "--enable=", &v)) {
1393 enable_service(v, 1);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]1394 continue;
1395 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1396 if (skip_prefix(arg, "--disable=", &v)) {
1397 enable_service(v, 0);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]1398 continue;
1399 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1400 if (skip_prefix(arg, "--allow-override=", &v)) {
1401 make_service_overridable(v, 1);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]1402 continue;
1403 }
Jeff Kingae021d82014-06-18 19:47:50[diff] [blame]1404 if (skip_prefix(arg, "--forbid-override=", &v)) {
1405 make_service_overridable(v, 0);
Junio C Hamanod819e4e2006-08-21 02:03:13[diff] [blame]1406 continue;
1407 }
Nguyễn Thái Ngọc Duy82246b72013-12-20 10:53:52[diff] [blame]1408 if (!strcmp(arg, "--informative-errors")) {
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]1409 informative_errors = 1;
1410 continue;
1411 }
Nguyễn Thái Ngọc Duy82246b72013-12-20 10:53:52[diff] [blame]1412 if (!strcmp(arg, "--no-informative-errors")) {
Jeff Kingd5570f42011-10-14 21:19:21[diff] [blame]1413 informative_errors = 0;
1414 continue;
1415 }
H. Peter Anvin4ae95682005-09-27 02:10:55[diff] [blame]1416 if (!strcmp(arg, "--")) {
1417 ok_paths = &argv[i+1];
1418 break;
1419 } else if (arg[0] != '-') {
1420 ok_paths = &argv[i];
1421 break;
1422 }
Linus Torvaldse64e1b72005-07-15 16:32:16[diff] [blame]1423
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1424 usage(daemon_usage);
1425 }
1426
Lucas Werkmeister0c591ca2018-02-04 18:30:37[diff] [blame]1427 if (log_destination == LOG_DESTINATION_UNSET) {
1428 if (inetd_mode || detach)
1429 log_destination = LOG_DESTINATION_SYSLOG;
1430 else
1431 log_destination = LOG_DESTINATION_STDERR;
1432 }
1433
1434 if (log_destination == LOG_DESTINATION_SYSLOG) {
Stephen R. van den Berg6a992e92008-08-14 18:02:20[diff] [blame]1435 openlog("git-daemon", LOG_PID, LOG_DAEMON);
Johannes Sixt22665bb2008-02-25 13:25:20[diff] [blame]1436 set_die_routine(daemon_die);
Junio C Hamano460c2012008-08-24 20:27:10[diff] [blame]1437 } else
Junio C Hamano48196af2008-09-04 03:33:29[diff] [blame]1438 /* avoid splitting a message in the middle */
Erik Faye-Lund48cfaea2010-11-04 01:35:17[diff] [blame]1439 setvbuf(stderr, NULL, _IOFBF, 4096);
Johannes Sixt22665bb2008-02-25 13:25:20[diff] [blame]1440
Erik Faye-Lund9cddf562010-11-04 01:35:23[diff] [blame]1441 if (inetd_mode && (detach || group_name || user_name))
1442 die("--detach, --user and --group are incompatible with --inetd");
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1443
Alexander Sulfrian3a3a29c2010-08-30 11:30:51[diff] [blame]1444 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
Jon Loeligerdd467622006-09-26 14:47:43[diff] [blame]1445 die("--listen= and --port= are incompatible with --inetd");
1446 else if (listen_port == 0)
1447 listen_port = DEFAULT_GIT_PORT;
1448
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1449 if (group_name && !user_name)
1450 die("--group supplied without --user");
1451
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1452 if (user_name)
1453 cred = prepare_credentials(user_name, group_name);
Tilman Sauerbeck678dac62006-08-22 17:37:41[diff] [blame]1454
Matthias Lederhoferad8b4f52006-07-13 10:02:29[diff] [blame]1455 if (strict_paths && (!ok_paths || !*ok_paths))
1456 die("option --strict-paths requires a whitelist");
1457
Junio C Hamano90b4a712008-09-09 08:27:07[diff] [blame]1458 if (base_path && !is_directory(base_path))
1459 die("base-path '%s' does not exist or is not a directory",
1460 base_path);
Johannes Sixt20632072008-02-26 12:00:55[diff] [blame]1461
Lucas Werkmeistere67d9062018-04-03 22:13:07[diff] [blame]1462 if (log_destination != LOG_DESTINATION_STDERR) {
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]1463 if (!freopen("/dev/null", "w", stderr))
1464 die_errno("failed to redirect stderr to /dev/null");
1465 }
1466
Erik Faye-Lundf9c87be2010-11-04 01:35:19[diff] [blame]1467 if (inetd_mode || serve_mode)
1468 return execute();
Andreas Ericssonbce82302005-11-14 16:41:01[diff] [blame]1469
Nguyễn Thái Ngọc Duyde0957c2014-02-08 07:08:51[diff] [blame]1470 if (detach) {
1471 if (daemonize())
1472 die("--detach not supported on this platform");
Jeff King57f5d522016-07-01 06:06:02[diff] [blame]1473 }
Matthias Lederhofer258e93a2006-07-13 16:32:11[diff] [blame]1474
Matthias Lederhofer45ed5d72006-07-13 10:18:08[diff] [blame]1475 if (pid_file)
Junio C Hamano1f76a102015-08-24 20:20:39[diff] [blame]1476 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
Matthias Lederhofer45ed5d72006-07-13 10:18:08[diff] [blame]1477
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]1478 /* prepare argv for serving-processes */
Jeff King850d2fe2016-02-22 22:44:21[diff] [blame]1479 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1480 argv_array_push(&cld_argv, "--serve");
Jonathan Nieder081f84e2011-01-04 04:04:46[diff] [blame]1481 for (i = 1; i < argc; ++i)
Jeff King850d2fe2016-02-22 22:44:21[diff] [blame]1482 argv_array_push(&cld_argv, argv[i]);
Erik Faye-Lund30e15602010-11-04 01:35:16[diff] [blame]1483
Erik Faye-Lunda666b472010-11-04 01:35:24[diff] [blame]1484 return serve(&listen_addr, listen_port, cred);
Linus Torvaldsa87e8be2005-07-14 02:45:26[diff] [blame]1485}