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Date:: Sat Mar 30 17:17:56 2024 UTC
Message:: add initial support for commit notifications to gotd(8) At present only email notifications are implemented. Code for HTTP notifications is not yet finished, hence HTTP-related documentation remains hidden for now. This adds a new 'notify' process which has an "exec" pledge. It runs helper programs which implement the notification transport layer, such as got-notify-email which speaks SMTP. This design avoids having to link all of gotd with network libraries and related crypto libraries. Notification content is generated by the 'repo_write' process. Commit log messages and diffstats are written to a file which the 'notify' process will pass on to its helpers on stdin. The default output looks similar to 'got log -d'. If too many new commits are present the output looks similar to 'got log -s' instead. Tags always look like 'got tag -l'. The session process coordinates generation of notifications. It maintains a notification queue which holds one notification per updated reference, and passes notification requests from this queue to the 'repo_write' process for notification content creation and then to the 'notify' process for notification delivery. Only one notification can be in flight at a time to avoid file descriptor starvation if many references get updated in a single client session. ok op@
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  1 ce1bfad9 2024-03-30 thomas /*
  2 ce1bfad9 2024-03-30 thomas  * Copyright (c) 2024 Stefan Sperling <stsp@openbsd.org>
  3 ce1bfad9 2024-03-30 thomas  *
  4 ce1bfad9 2024-03-30 thomas  * Permission to use, copy, modify, and distribute this software for any
  5 ce1bfad9 2024-03-30 thomas  * purpose with or without fee is hereby granted, provided that the above
  6 ce1bfad9 2024-03-30 thomas  * copyright notice and this permission notice appear in all copies.
  7 ce1bfad9 2024-03-30 thomas  *
  8 ce1bfad9 2024-03-30 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 ce1bfad9 2024-03-30 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 ce1bfad9 2024-03-30 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 ce1bfad9 2024-03-30 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 ce1bfad9 2024-03-30 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 ce1bfad9 2024-03-30 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 ce1bfad9 2024-03-30 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 ce1bfad9 2024-03-30 thomas  */
 16 ce1bfad9 2024-03-30 thomas 
 17 ce1bfad9 2024-03-30 thomas #include <sys/types.h>
 18 ce1bfad9 2024-03-30 thomas #include <sys/queue.h>
 19 ce1bfad9 2024-03-30 thomas #include <sys/tree.h>
 20 ce1bfad9 2024-03-30 thomas #include <sys/socket.h>
 21 ce1bfad9 2024-03-30 thomas #include <sys/wait.h>
 22 ce1bfad9 2024-03-30 thomas 
 23 ce1bfad9 2024-03-30 thomas #include <errno.h>
 24 ce1bfad9 2024-03-30 thomas #include <event.h>
 25 ce1bfad9 2024-03-30 thomas #include <siphash.h>
 26 ce1bfad9 2024-03-30 thomas #include <limits.h>
 27 ce1bfad9 2024-03-30 thomas #include <sha1.h>
 28 ce1bfad9 2024-03-30 thomas #include <sha2.h>
 29 ce1bfad9 2024-03-30 thomas #include <signal.h>
 30 ce1bfad9 2024-03-30 thomas #include <stdio.h>
 31 ce1bfad9 2024-03-30 thomas #include <stdlib.h>
 32 ce1bfad9 2024-03-30 thomas #include <string.h>
 33 ce1bfad9 2024-03-30 thomas #include <imsg.h>
 34 ce1bfad9 2024-03-30 thomas #include <unistd.h>
 35 ce1bfad9 2024-03-30 thomas 
 36 ce1bfad9 2024-03-30 thomas #include "got_error.h"
 37 ce1bfad9 2024-03-30 thomas #include "got_path.h"
 38 ce1bfad9 2024-03-30 thomas 
 39 ce1bfad9 2024-03-30 thomas #include "gotd.h"
 40 ce1bfad9 2024-03-30 thomas #include "log.h"
 41 ce1bfad9 2024-03-30 thomas #include "notify.h"
 42 ce1bfad9 2024-03-30 thomas 
 43 ce1bfad9 2024-03-30 thomas #ifndef nitems
 44 ce1bfad9 2024-03-30 thomas #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
 45 ce1bfad9 2024-03-30 thomas #endif
 46 ce1bfad9 2024-03-30 thomas 
 47 ce1bfad9 2024-03-30 thomas static struct gotd_notify {
 48 ce1bfad9 2024-03-30 thomas 	pid_t pid;
 49 ce1bfad9 2024-03-30 thomas 	const char *title;
 50 ce1bfad9 2024-03-30 thomas 	struct gotd_imsgev parent_iev;
 51 ce1bfad9 2024-03-30 thomas 	struct gotd_repolist *repos;
 52 ce1bfad9 2024-03-30 thomas 	const char *default_sender;
 53 ce1bfad9 2024-03-30 thomas } gotd_notify;
 54 ce1bfad9 2024-03-30 thomas 
 55 ce1bfad9 2024-03-30 thomas struct gotd_notify_session {
 56 ce1bfad9 2024-03-30 thomas 	STAILQ_ENTRY(gotd_notify_session) entry;
 57 ce1bfad9 2024-03-30 thomas 	uint32_t id;
 58 ce1bfad9 2024-03-30 thomas 	struct gotd_imsgev iev;
 59 ce1bfad9 2024-03-30 thomas };
 60 ce1bfad9 2024-03-30 thomas STAILQ_HEAD(gotd_notify_sessions, gotd_notify_session);
 61 ce1bfad9 2024-03-30 thomas 
 62 ce1bfad9 2024-03-30 thomas static struct gotd_notify_sessions gotd_notify_sessions[GOTD_CLIENT_TABLE_SIZE];
 63 ce1bfad9 2024-03-30 thomas static SIPHASH_KEY sessions_hash_key;
 64 ce1bfad9 2024-03-30 thomas 
 65 ce1bfad9 2024-03-30 thomas static void gotd_notify_shutdown(void);
 66 ce1bfad9 2024-03-30 thomas 
 67 ce1bfad9 2024-03-30 thomas static uint64_t
 68 ce1bfad9 2024-03-30 thomas session_hash(uint32_t session_id)
 69 ce1bfad9 2024-03-30 thomas {
 70 ce1bfad9 2024-03-30 thomas 	return SipHash24(&sessions_hash_key, &session_id, sizeof(session_id));
 71 ce1bfad9 2024-03-30 thomas }
 72 ce1bfad9 2024-03-30 thomas 
 73 ce1bfad9 2024-03-30 thomas static void
 74 ce1bfad9 2024-03-30 thomas add_session(struct gotd_notify_session *session)
 75 ce1bfad9 2024-03-30 thomas {
 76 ce1bfad9 2024-03-30 thomas 	uint64_t slot;
 77 ce1bfad9 2024-03-30 thomas 
 78 ce1bfad9 2024-03-30 thomas 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
 79 ce1bfad9 2024-03-30 thomas 	STAILQ_INSERT_HEAD(&gotd_notify_sessions[slot], session, entry);
 80 ce1bfad9 2024-03-30 thomas }
 81 ce1bfad9 2024-03-30 thomas 
 82 ce1bfad9 2024-03-30 thomas static struct gotd_notify_session *
 83 ce1bfad9 2024-03-30 thomas find_session(uint32_t session_id)
 84 ce1bfad9 2024-03-30 thomas {
 85 ce1bfad9 2024-03-30 thomas 	uint64_t slot;
 86 ce1bfad9 2024-03-30 thomas 	struct gotd_notify_session *s;
 87 ce1bfad9 2024-03-30 thomas 
 88 ce1bfad9 2024-03-30 thomas 	slot = session_hash(session_id) % nitems(gotd_notify_sessions);
 89 ce1bfad9 2024-03-30 thomas 	STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
 90 ce1bfad9 2024-03-30 thomas 		if (s->id == session_id)
 91 ce1bfad9 2024-03-30 thomas 			return s;
 92 ce1bfad9 2024-03-30 thomas 	}
 93 ce1bfad9 2024-03-30 thomas 
 94 ce1bfad9 2024-03-30 thomas 	return NULL;
 95 ce1bfad9 2024-03-30 thomas }
 96 ce1bfad9 2024-03-30 thomas 
 97 ce1bfad9 2024-03-30 thomas static struct gotd_notify_session *
 98 ce1bfad9 2024-03-30 thomas find_session_by_fd(int fd)
 99 ce1bfad9 2024-03-30 thomas {
100 ce1bfad9 2024-03-30 thomas 	uint64_t slot;
101 ce1bfad9 2024-03-30 thomas 	struct gotd_notify_session *s;
102 ce1bfad9 2024-03-30 thomas 
103 ce1bfad9 2024-03-30 thomas 	for (slot = 0; slot < nitems(gotd_notify_sessions); slot++) {
104 ce1bfad9 2024-03-30 thomas 		STAILQ_FOREACH(s, &gotd_notify_sessions[slot], entry) {
105 ce1bfad9 2024-03-30 thomas 			if (s->iev.ibuf.fd == fd)
106 ce1bfad9 2024-03-30 thomas 				return s;
107 ce1bfad9 2024-03-30 thomas 		}
108 ce1bfad9 2024-03-30 thomas 
109 ce1bfad9 2024-03-30 thomas 	}
110 ce1bfad9 2024-03-30 thomas 
111 ce1bfad9 2024-03-30 thomas 	return NULL;
112 ce1bfad9 2024-03-30 thomas }
113 ce1bfad9 2024-03-30 thomas 
114 ce1bfad9 2024-03-30 thomas 
115 ce1bfad9 2024-03-30 thomas static void
116 ce1bfad9 2024-03-30 thomas remove_session(struct gotd_notify_session *session)
117 ce1bfad9 2024-03-30 thomas {
118 ce1bfad9 2024-03-30 thomas 	uint64_t slot;
119 ce1bfad9 2024-03-30 thomas 
120 ce1bfad9 2024-03-30 thomas 	slot = session_hash(session->id) % nitems(gotd_notify_sessions);
121 ce1bfad9 2024-03-30 thomas 	STAILQ_REMOVE(&gotd_notify_sessions[slot], session,
122 ce1bfad9 2024-03-30 thomas 	    gotd_notify_session, entry);
123 ce1bfad9 2024-03-30 thomas 	free(session);
124 ce1bfad9 2024-03-30 thomas }
125 ce1bfad9 2024-03-30 thomas 
126 ce1bfad9 2024-03-30 thomas static uint32_t
127 ce1bfad9 2024-03-30 thomas get_session_id(void)
128 ce1bfad9 2024-03-30 thomas {
129 ce1bfad9 2024-03-30 thomas 	int duplicate = 0;
130 ce1bfad9 2024-03-30 thomas 	uint32_t id;
131 ce1bfad9 2024-03-30 thomas 
132 ce1bfad9 2024-03-30 thomas 	do {
133 ce1bfad9 2024-03-30 thomas 		id = arc4random();
134 ce1bfad9 2024-03-30 thomas 		duplicate = (find_session(id) != NULL);
135 ce1bfad9 2024-03-30 thomas 	} while (duplicate || id == 0);
136 ce1bfad9 2024-03-30 thomas 
137 ce1bfad9 2024-03-30 thomas 	return id;
138 ce1bfad9 2024-03-30 thomas }
139 ce1bfad9 2024-03-30 thomas 
140 ce1bfad9 2024-03-30 thomas static void
141 ce1bfad9 2024-03-30 thomas gotd_notify_sighdlr(int sig, short event, void *arg)
142 ce1bfad9 2024-03-30 thomas {
143 ce1bfad9 2024-03-30 thomas 	/*
144 ce1bfad9 2024-03-30 thomas 	 * Normal signal handler rules don't apply because libevent
145 ce1bfad9 2024-03-30 thomas 	 * decouples for us.
146 ce1bfad9 2024-03-30 thomas 	 */
147 ce1bfad9 2024-03-30 thomas 
148 ce1bfad9 2024-03-30 thomas 	switch (sig) {
149 ce1bfad9 2024-03-30 thomas 	case SIGHUP:
150 ce1bfad9 2024-03-30 thomas 		log_info("%s: ignoring SIGHUP", __func__);
151 ce1bfad9 2024-03-30 thomas 		break;
152 ce1bfad9 2024-03-30 thomas 	case SIGUSR1:
153 ce1bfad9 2024-03-30 thomas 		log_info("%s: ignoring SIGUSR1", __func__);
154 ce1bfad9 2024-03-30 thomas 		break;
155 ce1bfad9 2024-03-30 thomas 	case SIGTERM:
156 ce1bfad9 2024-03-30 thomas 	case SIGINT:
157 ce1bfad9 2024-03-30 thomas 		gotd_notify_shutdown();
158 ce1bfad9 2024-03-30 thomas 		/* NOTREACHED */
159 ce1bfad9 2024-03-30 thomas 		break;
160 ce1bfad9 2024-03-30 thomas 	default:
161 ce1bfad9 2024-03-30 thomas 		fatalx("unexpected signal");
162 ce1bfad9 2024-03-30 thomas 	}
163 ce1bfad9 2024-03-30 thomas }
164 ce1bfad9 2024-03-30 thomas 
165 ce1bfad9 2024-03-30 thomas static void
166 ce1bfad9 2024-03-30 thomas run_notification_helper(const char *prog, const char **argv, int fd)
167 ce1bfad9 2024-03-30 thomas {
168 ce1bfad9 2024-03-30 thomas 	const struct got_error *err = NULL;
169 ce1bfad9 2024-03-30 thomas 	pid_t pid;
170 ce1bfad9 2024-03-30 thomas 	int child_status;
171 ce1bfad9 2024-03-30 thomas 
172 ce1bfad9 2024-03-30 thomas 	pid = fork();
173 ce1bfad9 2024-03-30 thomas 	if (pid == -1) {
174 ce1bfad9 2024-03-30 thomas 		err = got_error_from_errno("fork");
175 ce1bfad9 2024-03-30 thomas 		log_warn("%s", err->msg);
176 ce1bfad9 2024-03-30 thomas 		return;
177 ce1bfad9 2024-03-30 thomas 	} else if (pid == 0) {
178 ce1bfad9 2024-03-30 thomas 		signal(SIGQUIT, SIG_DFL);
179 ce1bfad9 2024-03-30 thomas 		signal(SIGINT, SIG_DFL);
180 ce1bfad9 2024-03-30 thomas 		signal(SIGCHLD, SIG_DFL);
181 ce1bfad9 2024-03-30 thomas 
182 ce1bfad9 2024-03-30 thomas 		if (dup2(fd, STDIN_FILENO) == -1) {
183 ce1bfad9 2024-03-30 thomas 			fprintf(stderr, "%s: dup2: %s\n", getprogname(),
184 ce1bfad9 2024-03-30 thomas 			    strerror(errno));
185 ce1bfad9 2024-03-30 thomas 			_exit(1);
186 ce1bfad9 2024-03-30 thomas 		}
187 ce1bfad9 2024-03-30 thomas 
188 ce1bfad9 2024-03-30 thomas 		closefrom(STDERR_FILENO + 1);
189 ce1bfad9 2024-03-30 thomas 
190 ce1bfad9 2024-03-30 thomas 		if (execv(prog, (char *const *)argv) == -1) {
191 ce1bfad9 2024-03-30 thomas 			fprintf(stderr, "%s: exec %s: %s\n", getprogname(),
192 ce1bfad9 2024-03-30 thomas 			    prog, strerror(errno));
193 ce1bfad9 2024-03-30 thomas 			_exit(1);
194 ce1bfad9 2024-03-30 thomas 		}
195 ce1bfad9 2024-03-30 thomas 
196 ce1bfad9 2024-03-30 thomas 		/* not reached */
197 ce1bfad9 2024-03-30 thomas 	}
198 ce1bfad9 2024-03-30 thomas 
199 ce1bfad9 2024-03-30 thomas 	if (waitpid(pid, &child_status, 0) == -1) {
200 ce1bfad9 2024-03-30 thomas 		err = got_error_from_errno("waitpid");
201 ce1bfad9 2024-03-30 thomas 		goto done;
202 ce1bfad9 2024-03-30 thomas 	}
203 ce1bfad9 2024-03-30 thomas 
204 ce1bfad9 2024-03-30 thomas 	if (!WIFEXITED(child_status)) {
205 ce1bfad9 2024-03-30 thomas 		err = got_error(GOT_ERR_PRIVSEP_DIED);
206 ce1bfad9 2024-03-30 thomas 		goto done;
207 ce1bfad9 2024-03-30 thomas 	}
208 ce1bfad9 2024-03-30 thomas 
209 ce1bfad9 2024-03-30 thomas 	if (WEXITSTATUS(child_status) != 0)
210 ce1bfad9 2024-03-30 thomas 		err = got_error(GOT_ERR_PRIVSEP_EXIT);
211 ce1bfad9 2024-03-30 thomas done:
212 ce1bfad9 2024-03-30 thomas 	if (err)
213 ce1bfad9 2024-03-30 thomas 		log_warnx("%s: child %s pid %d: %s", gotd_notify.title,
214 ce1bfad9 2024-03-30 thomas 		    prog, pid, err->msg);
215 ce1bfad9 2024-03-30 thomas }
216 ce1bfad9 2024-03-30 thomas 
217 ce1bfad9 2024-03-30 thomas static void
218 ce1bfad9 2024-03-30 thomas notify_email(struct gotd_notification_target *target, const char *subject_line,
219 ce1bfad9 2024-03-30 thomas     int fd)
220 ce1bfad9 2024-03-30 thomas {
221 ce1bfad9 2024-03-30 thomas 	const char *argv[13];
222 ce1bfad9 2024-03-30 thomas 	int i = 0;
223 ce1bfad9 2024-03-30 thomas 
224 ce1bfad9 2024-03-30 thomas 	argv[i++] = GOTD_PATH_PROG_NOTIFY_EMAIL;
225 ce1bfad9 2024-03-30 thomas 
226 ce1bfad9 2024-03-30 thomas 	argv[i++] = "-f";
227 ce1bfad9 2024-03-30 thomas 	if (target->conf.email.sender)
228 ce1bfad9 2024-03-30 thomas 		argv[i++] = target->conf.email.sender;
229 ce1bfad9 2024-03-30 thomas 	else
230 ce1bfad9 2024-03-30 thomas 		argv[i++] = gotd_notify.default_sender;
231 ce1bfad9 2024-03-30 thomas 
232 ce1bfad9 2024-03-30 thomas 	if (target->conf.email.responder) {
233 ce1bfad9 2024-03-30 thomas 		argv[i++] = "-r";
234 ce1bfad9 2024-03-30 thomas 		argv[i++] = target->conf.email.responder;
235 ce1bfad9 2024-03-30 thomas 	}
236 ce1bfad9 2024-03-30 thomas 
237 ce1bfad9 2024-03-30 thomas 	if (target->conf.email.hostname) {
238 ce1bfad9 2024-03-30 thomas 		argv[i++] = "-h";
239 ce1bfad9 2024-03-30 thomas 		argv[i++] = target->conf.email.hostname;
240 ce1bfad9 2024-03-30 thomas 	}
241 ce1bfad9 2024-03-30 thomas 	
242 ce1bfad9 2024-03-30 thomas 	if (target->conf.email.port) {
243 ce1bfad9 2024-03-30 thomas 		argv[i++] = "-p";
244 ce1bfad9 2024-03-30 thomas 		argv[i++] = target->conf.email.port;
245 ce1bfad9 2024-03-30 thomas 	}
246 ce1bfad9 2024-03-30 thomas 
247 ce1bfad9 2024-03-30 thomas 	argv[i++] = "-s";
248 ce1bfad9 2024-03-30 thomas 	argv[i++] = subject_line;
249 ce1bfad9 2024-03-30 thomas 
250 ce1bfad9 2024-03-30 thomas 	argv[i++] = target->conf.email.recipient;
251 ce1bfad9 2024-03-30 thomas 
252 ce1bfad9 2024-03-30 thomas 	argv[i] = NULL;
253 ce1bfad9 2024-03-30 thomas 
254 ce1bfad9 2024-03-30 thomas 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_EMAIL, argv, fd);
255 ce1bfad9 2024-03-30 thomas }
256 ce1bfad9 2024-03-30 thomas 
257 ce1bfad9 2024-03-30 thomas static void
258 ce1bfad9 2024-03-30 thomas notify_http(struct gotd_notification_target *target, const char *subject_line,
259 ce1bfad9 2024-03-30 thomas     int fd)
260 ce1bfad9 2024-03-30 thomas {
261 ce1bfad9 2024-03-30 thomas 	const char *argv[10] = { 0 }; /* TODO */
262 ce1bfad9 2024-03-30 thomas 
263 ce1bfad9 2024-03-30 thomas 	run_notification_helper(GOTD_PATH_PROG_NOTIFY_HTTP, argv, fd);
264 ce1bfad9 2024-03-30 thomas }
265 ce1bfad9 2024-03-30 thomas 
266 ce1bfad9 2024-03-30 thomas static const struct got_error *
267 ce1bfad9 2024-03-30 thomas send_notification(struct imsg *imsg, struct gotd_imsgev *iev)
268 ce1bfad9 2024-03-30 thomas {
269 ce1bfad9 2024-03-30 thomas 	const struct got_error *err = NULL;
270 ce1bfad9 2024-03-30 thomas 	struct gotd_imsg_notify inotify;
271 ce1bfad9 2024-03-30 thomas 	size_t datalen;
272 ce1bfad9 2024-03-30 thomas 	struct gotd_repo *repo;
273 ce1bfad9 2024-03-30 thomas 	struct gotd_notification_target *target;
274 ce1bfad9 2024-03-30 thomas 	int fd;
275 ce1bfad9 2024-03-30 thomas 
276 ce1bfad9 2024-03-30 thomas 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
277 ce1bfad9 2024-03-30 thomas 	if (datalen != sizeof(inotify))
278 ce1bfad9 2024-03-30 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);
279 ce1bfad9 2024-03-30 thomas 
280 ce1bfad9 2024-03-30 thomas 	memcpy(&inotify, imsg->data, datalen);
281 ce1bfad9 2024-03-30 thomas 
282 ce1bfad9 2024-03-30 thomas 	repo = gotd_find_repo_by_name(inotify.repo_name, gotd_notify.repos);
283 ce1bfad9 2024-03-30 thomas 	if (repo == NULL)
284 ce1bfad9 2024-03-30 thomas 		return got_error(GOT_ERR_PRIVSEP_MSG);
285 ce1bfad9 2024-03-30 thomas 
286 ce1bfad9 2024-03-30 thomas 	fd = imsg_get_fd(imsg);
287 ce1bfad9 2024-03-30 thomas 	if (fd == -1)
288 ce1bfad9 2024-03-30 thomas 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
289 ce1bfad9 2024-03-30 thomas 
290 ce1bfad9 2024-03-30 thomas 	if (lseek(fd, 0, SEEK_SET) == -1) {
291 ce1bfad9 2024-03-30 thomas 		err = got_error_from_errno("lseek");
292 ce1bfad9 2024-03-30 thomas 		goto done;
293 ce1bfad9 2024-03-30 thomas 	}
294 ce1bfad9 2024-03-30 thomas 
295 ce1bfad9 2024-03-30 thomas 	STAILQ_FOREACH(target, &repo->notification_targets, entry) {
296 ce1bfad9 2024-03-30 thomas 		switch (target->type) {
297 ce1bfad9 2024-03-30 thomas 		case GOTD_NOTIFICATION_VIA_EMAIL:
298 ce1bfad9 2024-03-30 thomas 			notify_email(target, inotify.subject_line, fd);
299 ce1bfad9 2024-03-30 thomas 			break;
300 ce1bfad9 2024-03-30 thomas 		case GOTD_NOTIFICATION_VIA_HTTP:
301 ce1bfad9 2024-03-30 thomas 			notify_http(target, inotify.subject_line, fd);
302 ce1bfad9 2024-03-30 thomas 			break;
303 ce1bfad9 2024-03-30 thomas 		}
304 ce1bfad9 2024-03-30 thomas 	}
305 ce1bfad9 2024-03-30 thomas 
306 ce1bfad9 2024-03-30 thomas 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_NOTIFICATION_SENT,
307 ce1bfad9 2024-03-30 thomas 	    PROC_NOTIFY, -1, NULL, 0) == -1) {
308 ce1bfad9 2024-03-30 thomas 		err = got_error_from_errno("imsg compose NOTIFY");
309 ce1bfad9 2024-03-30 thomas 		goto done;
310 ce1bfad9 2024-03-30 thomas 	}
311 ce1bfad9 2024-03-30 thomas done:
312 ce1bfad9 2024-03-30 thomas 	close(fd);
313 ce1bfad9 2024-03-30 thomas 	return err;
314 ce1bfad9 2024-03-30 thomas }
315 ce1bfad9 2024-03-30 thomas 
316 ce1bfad9 2024-03-30 thomas static void
317 ce1bfad9 2024-03-30 thomas notify_dispatch_session(int fd, short event, void *arg)
318 ce1bfad9 2024-03-30 thomas {
319 ce1bfad9 2024-03-30 thomas 	struct gotd_imsgev *iev = arg;
320 ce1bfad9 2024-03-30 thomas 	struct imsgbuf *ibuf = &iev->ibuf;
321 ce1bfad9 2024-03-30 thomas 	ssize_t n;
322 ce1bfad9 2024-03-30 thomas 	int shut = 0;
323 ce1bfad9 2024-03-30 thomas 	struct imsg imsg;
324 ce1bfad9 2024-03-30 thomas 
325 ce1bfad9 2024-03-30 thomas 	if (event & EV_READ) {
326 ce1bfad9 2024-03-30 thomas 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
327 ce1bfad9 2024-03-30 thomas 			fatal("imsg_read error");
328 ce1bfad9 2024-03-30 thomas 		if (n == 0) {
329 ce1bfad9 2024-03-30 thomas 			/* Connection closed. */
330 ce1bfad9 2024-03-30 thomas 			shut = 1;
331 ce1bfad9 2024-03-30 thomas 			goto done;
332 ce1bfad9 2024-03-30 thomas 		}
333 ce1bfad9 2024-03-30 thomas 	}
334 ce1bfad9 2024-03-30 thomas 
335 ce1bfad9 2024-03-30 thomas 	if (event & EV_WRITE) {
336 ce1bfad9 2024-03-30 thomas 		n = msgbuf_write(&ibuf->w);
337 ce1bfad9 2024-03-30 thomas 		if (n == -1 && errno != EAGAIN)
338 ce1bfad9 2024-03-30 thomas 			fatal("msgbuf_write");
339 ce1bfad9 2024-03-30 thomas 		if (n == 0) {
340 ce1bfad9 2024-03-30 thomas 			/* Connection closed. */
341 ce1bfad9 2024-03-30 thomas 			shut = 1;
342 ce1bfad9 2024-03-30 thomas 			goto done;
343 ce1bfad9 2024-03-30 thomas 		}
344 ce1bfad9 2024-03-30 thomas 	}
345 ce1bfad9 2024-03-30 thomas 
346 ce1bfad9 2024-03-30 thomas 	for (;;) {
347 ce1bfad9 2024-03-30 thomas 		const struct got_error *err = NULL;
348 ce1bfad9 2024-03-30 thomas 
349 ce1bfad9 2024-03-30 thomas 		if ((n = imsg_get(ibuf, &imsg)) == -1)
350 ce1bfad9 2024-03-30 thomas 			fatal("%s: imsg_get error", __func__);
351 ce1bfad9 2024-03-30 thomas 		if (n == 0)	/* No more messages. */
352 ce1bfad9 2024-03-30 thomas 			break;
353 ce1bfad9 2024-03-30 thomas 
354 ce1bfad9 2024-03-30 thomas 		switch (imsg.hdr.type) {
355 ce1bfad9 2024-03-30 thomas 		case GOTD_IMSG_NOTIFY:
356 ce1bfad9 2024-03-30 thomas 			err = send_notification(&imsg, iev);
357 ce1bfad9 2024-03-30 thomas 			break;
358 ce1bfad9 2024-03-30 thomas 		default:
359 ce1bfad9 2024-03-30 thomas 			log_debug("unexpected imsg %d", imsg.hdr.type);
360 ce1bfad9 2024-03-30 thomas 			break;
361 ce1bfad9 2024-03-30 thomas 		}
362 ce1bfad9 2024-03-30 thomas 		imsg_free(&imsg);
363 ce1bfad9 2024-03-30 thomas 
364 ce1bfad9 2024-03-30 thomas 		if (err)
365 ce1bfad9 2024-03-30 thomas 			log_warnx("%s: %s", __func__, err->msg);
366 ce1bfad9 2024-03-30 thomas 	}
367 ce1bfad9 2024-03-30 thomas done:
368 ce1bfad9 2024-03-30 thomas 	if (!shut) {
369 ce1bfad9 2024-03-30 thomas 		gotd_imsg_event_add(iev);
370 ce1bfad9 2024-03-30 thomas 	} else {
371 ce1bfad9 2024-03-30 thomas 		struct gotd_notify_session *session;
372 ce1bfad9 2024-03-30 thomas 
373 ce1bfad9 2024-03-30 thomas 		/* This pipe is dead. Remove its event handler */
374 ce1bfad9 2024-03-30 thomas 		event_del(&iev->ev);
375 ce1bfad9 2024-03-30 thomas 		imsg_clear(&iev->ibuf);
376 ce1bfad9 2024-03-30 thomas 
377 ce1bfad9 2024-03-30 thomas 		session = find_session_by_fd(fd);
378 ce1bfad9 2024-03-30 thomas 		if (session)
379 ce1bfad9 2024-03-30 thomas 			remove_session(session);
380 ce1bfad9 2024-03-30 thomas 	}
381 ce1bfad9 2024-03-30 thomas }
382 ce1bfad9 2024-03-30 thomas 
383 ce1bfad9 2024-03-30 thomas static const struct got_error *
384 ce1bfad9 2024-03-30 thomas recv_session(struct imsg *imsg)
385 ce1bfad9 2024-03-30 thomas {
386 ce1bfad9 2024-03-30 thomas 	struct gotd_notify_session *session;
387 ce1bfad9 2024-03-30 thomas 	size_t datalen;
388 ce1bfad9 2024-03-30 thomas 	int fd;
389 ce1bfad9 2024-03-30 thomas 
390 ce1bfad9 2024-03-30 thomas 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
391 ce1bfad9 2024-03-30 thomas 	if (datalen != 0)
392 ce1bfad9 2024-03-30 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);
393 ce1bfad9 2024-03-30 thomas 
394 ce1bfad9 2024-03-30 thomas 	fd = imsg_get_fd(imsg);
395 ce1bfad9 2024-03-30 thomas 	if (fd == -1)
396 ce1bfad9 2024-03-30 thomas 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
397 ce1bfad9 2024-03-30 thomas 
398 ce1bfad9 2024-03-30 thomas 	session = calloc(1, sizeof(*session));
399 ce1bfad9 2024-03-30 thomas 	if (session == NULL)
400 ce1bfad9 2024-03-30 thomas 		return got_error_from_errno("calloc");
401 ce1bfad9 2024-03-30 thomas 
402 ce1bfad9 2024-03-30 thomas 	session->id = get_session_id();
403 ce1bfad9 2024-03-30 thomas 	imsg_init(&session->iev.ibuf, fd);
404 ce1bfad9 2024-03-30 thomas 	session->iev.handler = notify_dispatch_session;
405 ce1bfad9 2024-03-30 thomas 	session->iev.events = EV_READ;
406 ce1bfad9 2024-03-30 thomas 	session->iev.handler_arg = NULL;
407 ce1bfad9 2024-03-30 thomas 	event_set(&session->iev.ev, session->iev.ibuf.fd, EV_READ,
408 ce1bfad9 2024-03-30 thomas 	    notify_dispatch_session, &session->iev);
409 ce1bfad9 2024-03-30 thomas 	gotd_imsg_event_add(&session->iev);
410 ce1bfad9 2024-03-30 thomas 	add_session(session);
411 ce1bfad9 2024-03-30 thomas 
412 ce1bfad9 2024-03-30 thomas 	return NULL;
413 ce1bfad9 2024-03-30 thomas }
414 ce1bfad9 2024-03-30 thomas 
415 ce1bfad9 2024-03-30 thomas static void
416 ce1bfad9 2024-03-30 thomas notify_dispatch(int fd, short event, void *arg)
417 ce1bfad9 2024-03-30 thomas {
418 ce1bfad9 2024-03-30 thomas 	struct gotd_imsgev *iev = arg;
419 ce1bfad9 2024-03-30 thomas 	struct imsgbuf *ibuf = &iev->ibuf;
420 ce1bfad9 2024-03-30 thomas 	ssize_t n;
421 ce1bfad9 2024-03-30 thomas 	int shut = 0;
422 ce1bfad9 2024-03-30 thomas 	struct imsg imsg;
423 ce1bfad9 2024-03-30 thomas 
424 ce1bfad9 2024-03-30 thomas 	if (event & EV_READ) {
425 ce1bfad9 2024-03-30 thomas 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
426 ce1bfad9 2024-03-30 thomas 			fatal("imsg_read error");
427 ce1bfad9 2024-03-30 thomas 		if (n == 0) {
428 ce1bfad9 2024-03-30 thomas 			/* Connection closed. */
429 ce1bfad9 2024-03-30 thomas 			shut = 1;
430 ce1bfad9 2024-03-30 thomas 			goto done;
431 ce1bfad9 2024-03-30 thomas 		}
432 ce1bfad9 2024-03-30 thomas 	}
433 ce1bfad9 2024-03-30 thomas 
434 ce1bfad9 2024-03-30 thomas 	if (event & EV_WRITE) {
435 ce1bfad9 2024-03-30 thomas 		n = msgbuf_write(&ibuf->w);
436 ce1bfad9 2024-03-30 thomas 		if (n == -1 && errno != EAGAIN)
437 ce1bfad9 2024-03-30 thomas 			fatal("msgbuf_write");
438 ce1bfad9 2024-03-30 thomas 		if (n == 0) {
439 ce1bfad9 2024-03-30 thomas 			/* Connection closed. */
440 ce1bfad9 2024-03-30 thomas 			shut = 1;
441 ce1bfad9 2024-03-30 thomas 			goto done;
442 ce1bfad9 2024-03-30 thomas 		}
443 ce1bfad9 2024-03-30 thomas 	}
444 ce1bfad9 2024-03-30 thomas 
445 ce1bfad9 2024-03-30 thomas 	for (;;) {
446 ce1bfad9 2024-03-30 thomas 		const struct got_error *err = NULL;
447 ce1bfad9 2024-03-30 thomas 
448 ce1bfad9 2024-03-30 thomas 		if ((n = imsg_get(ibuf, &imsg)) == -1)
449 ce1bfad9 2024-03-30 thomas 			fatal("%s: imsg_get error", __func__);
450 ce1bfad9 2024-03-30 thomas 		if (n == 0)	/* No more messages. */
451 ce1bfad9 2024-03-30 thomas 			break;
452 ce1bfad9 2024-03-30 thomas 
453 ce1bfad9 2024-03-30 thomas 		switch (imsg.hdr.type) {
454 ce1bfad9 2024-03-30 thomas 		case GOTD_IMSG_CONNECT_SESSION:
455 ce1bfad9 2024-03-30 thomas 			err = recv_session(&imsg);
456 ce1bfad9 2024-03-30 thomas 			break;
457 ce1bfad9 2024-03-30 thomas 		default:
458 ce1bfad9 2024-03-30 thomas 			log_debug("unexpected imsg %d", imsg.hdr.type);
459 ce1bfad9 2024-03-30 thomas 			break;
460 ce1bfad9 2024-03-30 thomas 		}
461 ce1bfad9 2024-03-30 thomas 		imsg_free(&imsg);
462 ce1bfad9 2024-03-30 thomas 
463 ce1bfad9 2024-03-30 thomas 		if (err)
464 ce1bfad9 2024-03-30 thomas 			log_warnx("%s: %s", __func__, err->msg);
465 ce1bfad9 2024-03-30 thomas 	}
466 ce1bfad9 2024-03-30 thomas done:
467 ce1bfad9 2024-03-30 thomas 	if (!shut) {
468 ce1bfad9 2024-03-30 thomas 		gotd_imsg_event_add(iev);
469 ce1bfad9 2024-03-30 thomas 	} else {
470 ce1bfad9 2024-03-30 thomas 		/* This pipe is dead. Remove its event handler */
471 ce1bfad9 2024-03-30 thomas 		event_del(&iev->ev);
472 ce1bfad9 2024-03-30 thomas 		event_loopexit(NULL);
473 ce1bfad9 2024-03-30 thomas 	}
474 ce1bfad9 2024-03-30 thomas 
475 ce1bfad9 2024-03-30 thomas }
476 ce1bfad9 2024-03-30 thomas 
477 ce1bfad9 2024-03-30 thomas void
478 ce1bfad9 2024-03-30 thomas notify_main(const char *title, struct gotd_repolist *repos,
479 ce1bfad9 2024-03-30 thomas     const char *default_sender)
480 ce1bfad9 2024-03-30 thomas {
481 ce1bfad9 2024-03-30 thomas 	const struct got_error *err = NULL;
482 ce1bfad9 2024-03-30 thomas 	struct event evsigint, evsigterm, evsighup, evsigusr1;
483 ce1bfad9 2024-03-30 thomas 
484 ce1bfad9 2024-03-30 thomas 	arc4random_buf(&sessions_hash_key, sizeof(sessions_hash_key));
485 ce1bfad9 2024-03-30 thomas 
486 ce1bfad9 2024-03-30 thomas 	gotd_notify.title = title;
487 ce1bfad9 2024-03-30 thomas 	gotd_notify.repos = repos;
488 ce1bfad9 2024-03-30 thomas 	gotd_notify.default_sender = default_sender;
489 ce1bfad9 2024-03-30 thomas 	gotd_notify.pid = getpid();
490 ce1bfad9 2024-03-30 thomas 
491 ce1bfad9 2024-03-30 thomas 	signal_set(&evsigint, SIGINT, gotd_notify_sighdlr, NULL);
492 ce1bfad9 2024-03-30 thomas 	signal_set(&evsigterm, SIGTERM, gotd_notify_sighdlr, NULL);
493 ce1bfad9 2024-03-30 thomas 	signal_set(&evsighup, SIGHUP, gotd_notify_sighdlr, NULL);
494 ce1bfad9 2024-03-30 thomas 	signal_set(&evsigusr1, SIGUSR1, gotd_notify_sighdlr, NULL);
495 ce1bfad9 2024-03-30 thomas 	signal(SIGPIPE, SIG_IGN);
496 ce1bfad9 2024-03-30 thomas 
497 ce1bfad9 2024-03-30 thomas 	signal_add(&evsigint, NULL);
498 ce1bfad9 2024-03-30 thomas 	signal_add(&evsigterm, NULL);
499 ce1bfad9 2024-03-30 thomas 	signal_add(&evsighup, NULL);
500 ce1bfad9 2024-03-30 thomas 	signal_add(&evsigusr1, NULL);
501 ce1bfad9 2024-03-30 thomas 
502 ce1bfad9 2024-03-30 thomas 	imsg_init(&gotd_notify.parent_iev.ibuf, GOTD_FILENO_MSG_PIPE);
503 ce1bfad9 2024-03-30 thomas 	gotd_notify.parent_iev.handler = notify_dispatch;
504 ce1bfad9 2024-03-30 thomas 	gotd_notify.parent_iev.events = EV_READ;
505 ce1bfad9 2024-03-30 thomas 	gotd_notify.parent_iev.handler_arg = NULL;
506 ce1bfad9 2024-03-30 thomas 	event_set(&gotd_notify.parent_iev.ev, gotd_notify.parent_iev.ibuf.fd,
507 ce1bfad9 2024-03-30 thomas 	    EV_READ, notify_dispatch, &gotd_notify.parent_iev);
508 ce1bfad9 2024-03-30 thomas 	gotd_imsg_event_add(&gotd_notify.parent_iev);
509 ce1bfad9 2024-03-30 thomas 
510 ce1bfad9 2024-03-30 thomas 	event_dispatch();
511 ce1bfad9 2024-03-30 thomas 
512 ce1bfad9 2024-03-30 thomas 	if (err)
513 ce1bfad9 2024-03-30 thomas 		log_warnx("%s: %s", title, err->msg);
514 ce1bfad9 2024-03-30 thomas 	gotd_notify_shutdown();
515 ce1bfad9 2024-03-30 thomas }
516 ce1bfad9 2024-03-30 thomas 
517 ce1bfad9 2024-03-30 thomas void
518 ce1bfad9 2024-03-30 thomas gotd_notify_shutdown(void)
519 ce1bfad9 2024-03-30 thomas {
520 ce1bfad9 2024-03-30 thomas 	log_debug("shutting down");
521 ce1bfad9 2024-03-30 thomas 	exit(0);
522 ce1bfad9 2024-03-30 thomas }