1 8a35f56c 2022-07-16 thomas /*
  2 8a35f56c 2022-07-16 thomas  * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
  3 8a35f56c 2022-07-16 thomas  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
  4 8a35f56c 2022-07-16 thomas  *
  5 8a35f56c 2022-07-16 thomas  * Permission to use, copy, modify, and distribute this software for any
  6 8a35f56c 2022-07-16 thomas  * purpose with or without fee is hereby granted, provided that the above
  7 8a35f56c 2022-07-16 thomas  * copyright notice and this permission notice appear in all copies.
  8 8a35f56c 2022-07-16 thomas  *
  9 8a35f56c 2022-07-16 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 10 8a35f56c 2022-07-16 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 11 8a35f56c 2022-07-16 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 12 8a35f56c 2022-07-16 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 13 8a35f56c 2022-07-16 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 14 8a35f56c 2022-07-16 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 15 8a35f56c 2022-07-16 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 16 8a35f56c 2022-07-16 thomas  */
 17 4fccd2fe 2023-03-08 thomas #include "got_compat.h"
 18 8a35f56c 2022-07-16 thomas 
 19 8a35f56c 2022-07-16 thomas #include <sys/types.h>
 20 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 21 8a35f56c 2022-07-16 thomas #include <sys/socket.h>
 22 8a35f56c 2022-07-16 thomas #include <sys/wait.h>
 23 8a35f56c 2022-07-16 thomas 
 24 8a35f56c 2022-07-16 thomas #include <fcntl.h>
 25 8a35f56c 2022-07-16 thomas #include <stdio.h>
 26 8a35f56c 2022-07-16 thomas #include <stdlib.h>
 27 8a35f56c 2022-07-16 thomas #include <unistd.h>
 28 8a35f56c 2022-07-16 thomas #include <string.h>
 29 8a35f56c 2022-07-16 thomas #include <errno.h>
 30 8a35f56c 2022-07-16 thomas #include <signal.h>
 31 8a35f56c 2022-07-16 thomas #include <pwd.h>
 32 8a35f56c 2022-07-16 thomas #include <event.h>
 33 8a35f56c 2022-07-16 thomas 
 34 8a35f56c 2022-07-16 thomas #include "proc.h"
 35 8a35f56c 2022-07-16 thomas 
 36 8a35f56c 2022-07-16 thomas void	 proc_exec(struct privsep *, struct privsep_proc *, unsigned int,
 37 8a35f56c 2022-07-16 thomas 	    int, char **);
 38 8a35f56c 2022-07-16 thomas void	 proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
 39 8a35f56c 2022-07-16 thomas void	 proc_open(struct privsep *, int, int);
 40 8a35f56c 2022-07-16 thomas void	 proc_accept(struct privsep *, int, enum privsep_procid,
 41 8a35f56c 2022-07-16 thomas 	    unsigned int);
 42 8a35f56c 2022-07-16 thomas void	 proc_close(struct privsep *);
 43 8a35f56c 2022-07-16 thomas void	 proc_shutdown(struct privsep_proc *);
 44 8a35f56c 2022-07-16 thomas void	 proc_sig_handler(int, short, void *);
 45 8a35f56c 2022-07-16 thomas int	 proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
 46 8a35f56c 2022-07-16 thomas 
 47 8a35f56c 2022-07-16 thomas enum privsep_procid privsep_process;
 48 8a35f56c 2022-07-16 thomas 
 49 8a35f56c 2022-07-16 thomas enum privsep_procid
 50 8a35f56c 2022-07-16 thomas proc_getid(struct privsep_proc *procs, unsigned int nproc,
 51 8a35f56c 2022-07-16 thomas     const char *proc_name)
 52 8a35f56c 2022-07-16 thomas {
 53 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p;
 54 8a35f56c 2022-07-16 thomas 	unsigned int proc;
 55 8a35f56c 2022-07-16 thomas 
 56 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
 57 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
 58 8a35f56c 2022-07-16 thomas 		if (strcmp(p->p_title, proc_name))
 59 8a35f56c 2022-07-16 thomas 			continue;
 60 8a35f56c 2022-07-16 thomas 
 61 8a35f56c 2022-07-16 thomas 		return (p->p_id);
 62 8a35f56c 2022-07-16 thomas 	}
 63 8a35f56c 2022-07-16 thomas 
 64 8a35f56c 2022-07-16 thomas 	return (PROC_MAX);
 65 8a35f56c 2022-07-16 thomas }
 66 8a35f56c 2022-07-16 thomas 
 67 8a35f56c 2022-07-16 thomas void
 68 8a35f56c 2022-07-16 thomas proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
 69 8a35f56c 2022-07-16 thomas     int argc, char **argv)
 70 8a35f56c 2022-07-16 thomas {
 71 8a35f56c 2022-07-16 thomas 	unsigned int proc, nargc, i, proc_i;
 72 8a35f56c 2022-07-16 thomas 	char **nargv;
 73 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p;
 74 8a35f56c 2022-07-16 thomas 	char num[32];
 75 8a35f56c 2022-07-16 thomas 	int fd;
 76 8a35f56c 2022-07-16 thomas 
 77 8a35f56c 2022-07-16 thomas 	/* Prepare the new process argv. */
 78 8a35f56c 2022-07-16 thomas 	nargv = calloc(argc + 5, sizeof(char *));
 79 8a35f56c 2022-07-16 thomas 	if (nargv == NULL)
 80 8a35f56c 2022-07-16 thomas 		fatal("%s: calloc", __func__);
 81 8a35f56c 2022-07-16 thomas 
 82 8a35f56c 2022-07-16 thomas 	/* Copy call argument first. */
 83 8a35f56c 2022-07-16 thomas 	nargc = 0;
 84 8a35f56c 2022-07-16 thomas 	nargv[nargc++] = argv[0];
 85 8a35f56c 2022-07-16 thomas 
 86 8a35f56c 2022-07-16 thomas 	/* Set process name argument and save the position. */
 87 8a35f56c 2022-07-16 thomas 	nargv[nargc] = strdup("-P");
 88 8a35f56c 2022-07-16 thomas 	if (nargv[nargc] == NULL)
 89 8a35f56c 2022-07-16 thomas 		fatal("%s: strdup", __func__);
 90 8a35f56c 2022-07-16 thomas 	nargc++;
 91 8a35f56c 2022-07-16 thomas 	proc_i = nargc;
 92 8a35f56c 2022-07-16 thomas 	nargc++;
 93 8a35f56c 2022-07-16 thomas 
 94 8a35f56c 2022-07-16 thomas 	/* Point process instance arg to stack and copy the original args. */
 95 8a35f56c 2022-07-16 thomas 	nargv[nargc] = strdup("-I");
 96 8a35f56c 2022-07-16 thomas 	if (nargv[nargc] == NULL)
 97 8a35f56c 2022-07-16 thomas 		fatal("%s: strdup", __func__);
 98 8a35f56c 2022-07-16 thomas 	nargc++;
 99 8a35f56c 2022-07-16 thomas 	nargv[nargc++] = num;
100 8a35f56c 2022-07-16 thomas 	for (i = 1; i < (unsigned int) argc; i++)
101 8a35f56c 2022-07-16 thomas 		nargv[nargc++] = argv[i];
102 8a35f56c 2022-07-16 thomas 
103 8a35f56c 2022-07-16 thomas 	nargv[nargc] = NULL;
104 8a35f56c 2022-07-16 thomas 
105 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
106 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
107 8a35f56c 2022-07-16 thomas 
108 8a35f56c 2022-07-16 thomas 		/* Update args with process title. */
109 8a35f56c 2022-07-16 thomas 		nargv[proc_i] = (char *)(uintptr_t)p->p_title;
110 8a35f56c 2022-07-16 thomas 
111 8a35f56c 2022-07-16 thomas 		/* Fire children processes. */
112 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
113 8a35f56c 2022-07-16 thomas 			/* Update the process instance number. */
114 8a35f56c 2022-07-16 thomas 			snprintf(num, sizeof(num), "%u", i);
115 8a35f56c 2022-07-16 thomas 
116 8a35f56c 2022-07-16 thomas 			fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0];
117 8a35f56c 2022-07-16 thomas 			ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0] = -1;
118 8a35f56c 2022-07-16 thomas 
119 8a35f56c 2022-07-16 thomas 			switch (fork()) {
120 8a35f56c 2022-07-16 thomas 			case -1:
121 8a35f56c 2022-07-16 thomas 				fatal("%s: fork", __func__);
122 8a35f56c 2022-07-16 thomas 				break;
123 8a35f56c 2022-07-16 thomas 			case 0:
124 8a35f56c 2022-07-16 thomas 				/* First create a new session */
125 8a35f56c 2022-07-16 thomas 				if (setsid() == -1)
126 8a35f56c 2022-07-16 thomas 					fatal("setsid");
127 8a35f56c 2022-07-16 thomas 
128 8a35f56c 2022-07-16 thomas 				/* Prepare parent socket. */
129 8a35f56c 2022-07-16 thomas 				if (fd != PROC_GOTWEBD_SOCK_FILENO) {
130 8a35f56c 2022-07-16 thomas 					if (dup2(fd, PROC_GOTWEBD_SOCK_FILENO)
131 8a35f56c 2022-07-16 thomas 					    == -1)
132 8a35f56c 2022-07-16 thomas 						fatal("dup2");
133 8a35f56c 2022-07-16 thomas 				} else if (fcntl(fd, F_SETFD, 0) == -1)
134 8a35f56c 2022-07-16 thomas 					fatal("fcntl");
135 8a35f56c 2022-07-16 thomas 
136 8a35f56c 2022-07-16 thomas 				execvp(argv[0], nargv);
137 8a35f56c 2022-07-16 thomas 				fatal("%s: execvp", __func__);
138 8a35f56c 2022-07-16 thomas 				break;
139 8a35f56c 2022-07-16 thomas 			default:
140 8a35f56c 2022-07-16 thomas 				/* Close child end. */
141 8a35f56c 2022-07-16 thomas 				close(fd);
142 8a35f56c 2022-07-16 thomas 				break;
143 8a35f56c 2022-07-16 thomas 			}
144 8a35f56c 2022-07-16 thomas 		}
145 8a35f56c 2022-07-16 thomas 	}
146 8a35f56c 2022-07-16 thomas 
147 8a35f56c 2022-07-16 thomas 	free(nargv);
148 8a35f56c 2022-07-16 thomas }
149 8a35f56c 2022-07-16 thomas 
150 8a35f56c 2022-07-16 thomas void
151 8a35f56c 2022-07-16 thomas proc_connect(struct privsep *ps)
152 8a35f56c 2022-07-16 thomas {
153 8a35f56c 2022-07-16 thomas 	struct imsgev *iev;
154 8a35f56c 2022-07-16 thomas 	unsigned int src, dst, inst;
155 8a35f56c 2022-07-16 thomas 
156 8a35f56c 2022-07-16 thomas 	/* Don't distribute any sockets if we are not really going to run. */
157 8a35f56c 2022-07-16 thomas 	if (ps->ps_noaction)
158 8a35f56c 2022-07-16 thomas 		return;
159 8a35f56c 2022-07-16 thomas 
160 8a35f56c 2022-07-16 thomas 	for (dst = 0; dst < PROC_MAX; dst++) {
161 8a35f56c 2022-07-16 thomas 		/* We don't communicate with ourselves. */
162 8a35f56c 2022-07-16 thomas 		if (dst == PROC_GOTWEBD)
163 8a35f56c 2022-07-16 thomas 			continue;
164 8a35f56c 2022-07-16 thomas 
165 8a35f56c 2022-07-16 thomas 		for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
166 8a35f56c 2022-07-16 thomas 			iev = &ps->ps_ievs[dst][inst];
167 8a35f56c 2022-07-16 thomas 			imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
168 8a35f56c 2022-07-16 thomas 			event_set(&iev->ev, iev->ibuf.fd, iev->events,
169 8a35f56c 2022-07-16 thomas 			    iev->handler, iev->data);
170 8a35f56c 2022-07-16 thomas 			event_add(&iev->ev, NULL);
171 8a35f56c 2022-07-16 thomas 		}
172 8a35f56c 2022-07-16 thomas 	}
173 8a35f56c 2022-07-16 thomas 
174 8a35f56c 2022-07-16 thomas 	/* Distribute the socketpair()s for everyone. */
175 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++)
176 8a35f56c 2022-07-16 thomas 		for (dst = src; dst < PROC_MAX; dst++) {
177 8a35f56c 2022-07-16 thomas 			/* Parent already distributed its fds. */
178 8a35f56c 2022-07-16 thomas 			if (src == PROC_GOTWEBD || dst == PROC_GOTWEBD)
179 8a35f56c 2022-07-16 thomas 				continue;
180 8a35f56c 2022-07-16 thomas 
181 8a35f56c 2022-07-16 thomas 			proc_open(ps, src, dst);
182 8a35f56c 2022-07-16 thomas 		}
183 8a35f56c 2022-07-16 thomas }
184 8a35f56c 2022-07-16 thomas 
185 8a35f56c 2022-07-16 thomas void
186 8a35f56c 2022-07-16 thomas proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
187 8a35f56c 2022-07-16 thomas     int argc, char **argv, enum privsep_procid proc_id)
188 8a35f56c 2022-07-16 thomas {
189 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = NULL;
190 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pa, *pb;
191 8a35f56c 2022-07-16 thomas 	unsigned int proc;
192 8a35f56c 2022-07-16 thomas 	unsigned int dst;
193 8a35f56c 2022-07-16 thomas 	int fds[2];
194 8a35f56c 2022-07-16 thomas 
195 8a35f56c 2022-07-16 thomas 	/* Don't initiate anything if we are not really going to run. */
196 8a35f56c 2022-07-16 thomas 	if (ps->ps_noaction)
197 8a35f56c 2022-07-16 thomas 		return;
198 8a35f56c 2022-07-16 thomas 
199 8a35f56c 2022-07-16 thomas 	if (proc_id == PROC_GOTWEBD) {
200 8a35f56c 2022-07-16 thomas 		privsep_process = PROC_GOTWEBD;
201 8a35f56c 2022-07-16 thomas 		proc_setup(ps, procs, nproc);
202 8a35f56c 2022-07-16 thomas 
203 8a35f56c 2022-07-16 thomas 		/*
204 b6b86fd1 2022-08-30 thomas 		 * Create the children sockets so we can use them
205 8a35f56c 2022-07-16 thomas 		 * to distribute the rest of the socketpair()s using
206 8a35f56c 2022-07-16 thomas 		 * proc_connect() later.
207 8a35f56c 2022-07-16 thomas 		 */
208 8a35f56c 2022-07-16 thomas 		for (dst = 0; dst < PROC_MAX; dst++) {
209 8a35f56c 2022-07-16 thomas 			/* Don't create socket for ourselves. */
210 8a35f56c 2022-07-16 thomas 			if (dst == PROC_GOTWEBD)
211 8a35f56c 2022-07-16 thomas 				continue;
212 8a35f56c 2022-07-16 thomas 
213 8a35f56c 2022-07-16 thomas 			for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
214 8a35f56c 2022-07-16 thomas 				pa = &ps->ps_pipes[PROC_GOTWEBD][0];
215 8a35f56c 2022-07-16 thomas 				pb = &ps->ps_pipes[dst][proc];
216 dd7a7d5b 2022-07-16 thomas 				int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
217 dd7a7d5b 2022-07-16 thomas #ifdef SOCK_CLOEXEC
218 dd7a7d5b 2022-07-16 thomas 				sock_flags |= SOCK_CLOEXEC;
219 dd7a7d5b 2022-07-16 thomas #endif
220 dd7a7d5b 2022-07-16 thomas 				if (socketpair(AF_UNIX, sock_flags,
221 8a35f56c 2022-07-16 thomas 				    PF_UNSPEC, fds) == -1)
222 8a35f56c 2022-07-16 thomas 					fatal("%s: socketpair", __func__);
223 8a35f56c 2022-07-16 thomas 
224 8a35f56c 2022-07-16 thomas 				pa->pp_pipes[dst][proc] = fds[0];
225 8a35f56c 2022-07-16 thomas 				pb->pp_pipes[PROC_GOTWEBD][0] = fds[1];
226 8a35f56c 2022-07-16 thomas 			}
227 8a35f56c 2022-07-16 thomas 		}
228 8a35f56c 2022-07-16 thomas 
229 8a35f56c 2022-07-16 thomas 		/* Engage! */
230 8a35f56c 2022-07-16 thomas 		proc_exec(ps, procs, nproc, argc, argv);
231 8a35f56c 2022-07-16 thomas 		return;
232 8a35f56c 2022-07-16 thomas 	}
233 8a35f56c 2022-07-16 thomas 
234 8a35f56c 2022-07-16 thomas 	/* Initialize a child */
235 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
236 8a35f56c 2022-07-16 thomas 		if (procs[proc].p_id != proc_id)
237 8a35f56c 2022-07-16 thomas 			continue;
238 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
239 8a35f56c 2022-07-16 thomas 		break;
240 8a35f56c 2022-07-16 thomas 	}
241 8a35f56c 2022-07-16 thomas 	if (p == NULL || p->p_init == NULL)
242 8a35f56c 2022-07-16 thomas 		fatalx("%s: process %d missing process initialization",
243 8a35f56c 2022-07-16 thomas 		    __func__, proc_id);
244 8a35f56c 2022-07-16 thomas 
245 8a35f56c 2022-07-16 thomas 	p->p_init(ps, p);
246 8a35f56c 2022-07-16 thomas 
247 8a35f56c 2022-07-16 thomas 	fatalx("failed to initiate child process");
248 8a35f56c 2022-07-16 thomas }
249 8a35f56c 2022-07-16 thomas 
250 8a35f56c 2022-07-16 thomas void
251 8a35f56c 2022-07-16 thomas proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
252 8a35f56c 2022-07-16 thomas     unsigned int n)
253 8a35f56c 2022-07-16 thomas {
254 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp = ps->ps_pp;
255 8a35f56c 2022-07-16 thomas 	struct imsgev *iev;
256 8a35f56c 2022-07-16 thomas 
257 8a35f56c 2022-07-16 thomas 	if (ps->ps_ievs[dst] == NULL) {
258 8a35f56c 2022-07-16 thomas #if DEBUG > 1
259 8a35f56c 2022-07-16 thomas 		log_debug("%s: %s src %d %d to dst %d %d not connected",
260 8a35f56c 2022-07-16 thomas 		    __func__, ps->ps_title[privsep_process],
261 8a35f56c 2022-07-16 thomas 		    privsep_process, ps->ps_instance + 1,
262 8a35f56c 2022-07-16 thomas 		    dst, n + 1);
263 8a35f56c 2022-07-16 thomas #endif
264 8a35f56c 2022-07-16 thomas 		close(fd);
265 8a35f56c 2022-07-16 thomas 		return;
266 8a35f56c 2022-07-16 thomas 	}
267 8a35f56c 2022-07-16 thomas 
268 8a35f56c 2022-07-16 thomas 	if (pp->pp_pipes[dst][n] != -1) {
269 8a35f56c 2022-07-16 thomas 		log_warnx("%s: duplicated descriptor", __func__);
270 8a35f56c 2022-07-16 thomas 		close(fd);
271 8a35f56c 2022-07-16 thomas 		return;
272 8a35f56c 2022-07-16 thomas 	} else
273 8a35f56c 2022-07-16 thomas 		pp->pp_pipes[dst][n] = fd;
274 8a35f56c 2022-07-16 thomas 
275 8a35f56c 2022-07-16 thomas 	iev = &ps->ps_ievs[dst][n];
276 8a35f56c 2022-07-16 thomas 	imsg_init(&iev->ibuf, fd);
277 8a35f56c 2022-07-16 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
278 8a35f56c 2022-07-16 thomas 	event_add(&iev->ev, NULL);
279 8a35f56c 2022-07-16 thomas }
280 8a35f56c 2022-07-16 thomas 
281 8a35f56c 2022-07-16 thomas void
282 8a35f56c 2022-07-16 thomas proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
283 8a35f56c 2022-07-16 thomas {
284 8a35f56c 2022-07-16 thomas 	unsigned int i, j, src, dst, id;
285 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp;
286 8a35f56c 2022-07-16 thomas 
287 8a35f56c 2022-07-16 thomas 	/* Initialize parent title, ps_instances and procs. */
288 8a35f56c 2022-07-16 thomas 	ps->ps_title[PROC_GOTWEBD] = "parent";
289 8a35f56c 2022-07-16 thomas 
290 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++)
291 8a35f56c 2022-07-16 thomas 		/* Default to 1 process instance */
292 8a35f56c 2022-07-16 thomas 		if (ps->ps_instances[src] < 1)
293 8a35f56c 2022-07-16 thomas 			ps->ps_instances[src] = 1;
294 8a35f56c 2022-07-16 thomas 
295 8a35f56c 2022-07-16 thomas 	for (src = 0; src < nproc; src++) {
296 8a35f56c 2022-07-16 thomas 		procs[src].p_ps = ps;
297 8a35f56c 2022-07-16 thomas 		if (procs[src].p_cb == NULL)
298 8a35f56c 2022-07-16 thomas 			procs[src].p_cb = proc_dispatch_null;
299 8a35f56c 2022-07-16 thomas 
300 8a35f56c 2022-07-16 thomas 		id = procs[src].p_id;
301 8a35f56c 2022-07-16 thomas 		ps->ps_title[id] = procs[src].p_title;
302 8a35f56c 2022-07-16 thomas 		ps->ps_ievs[id] = calloc(ps->ps_instances[id],
303 8a35f56c 2022-07-16 thomas 		    sizeof(struct imsgev));
304 8a35f56c 2022-07-16 thomas 		if (ps->ps_ievs[id] == NULL)
305 8a35f56c 2022-07-16 thomas 			fatal("%s: calloc", __func__);
306 8a35f56c 2022-07-16 thomas 
307 8a35f56c 2022-07-16 thomas 		/* With this set up, we are ready to call imsg_init(). */
308 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[id]; i++) {
309 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].handler = proc_dispatch;
310 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].events = EV_READ;
311 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].proc = &procs[src];
312 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
313 8a35f56c 2022-07-16 thomas 		}
314 8a35f56c 2022-07-16 thomas 	}
315 8a35f56c 2022-07-16 thomas 
316 8a35f56c 2022-07-16 thomas 	/*
317 8a35f56c 2022-07-16 thomas 	 * Allocate pipes for all process instances (incl. parent)
318 8a35f56c 2022-07-16 thomas 	 *
319 8a35f56c 2022-07-16 thomas 	 * - ps->ps_pipes: N:M mapping
320 8a35f56c 2022-07-16 thomas 	 * N source processes connected to M destination processes:
321 8a35f56c 2022-07-16 thomas 	 * [src][instances][dst][instances], for example
322 8a35f56c 2022-07-16 thomas 	 * [PROC_RELAY][3][PROC_CA][3]
323 8a35f56c 2022-07-16 thomas 	 *
324 8a35f56c 2022-07-16 thomas 	 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
325 8a35f56c 2022-07-16 thomas 	 * Each process instance has a destination array of socketpair fds:
326 8a35f56c 2022-07-16 thomas 	 * [dst][instances], for example
327 8a35f56c 2022-07-16 thomas 	 * [PROC_GOTWEBD][0]
328 8a35f56c 2022-07-16 thomas 	 */
329 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++) {
330 8a35f56c 2022-07-16 thomas 		/* Allocate destination array for each process */
331 8a35f56c 2022-07-16 thomas 		ps->ps_pipes[src] = calloc(ps->ps_instances[src],
332 8a35f56c 2022-07-16 thomas 		    sizeof(struct privsep_pipes));
333 8a35f56c 2022-07-16 thomas 		if (ps->ps_pipes[src] == NULL)
334 8a35f56c 2022-07-16 thomas 			fatal("%s: calloc", __func__);
335 8a35f56c 2022-07-16 thomas 
336 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[src]; i++) {
337 8a35f56c 2022-07-16 thomas 			pp = &ps->ps_pipes[src][i];
338 8a35f56c 2022-07-16 thomas 
339 8a35f56c 2022-07-16 thomas 			for (dst = 0; dst < PROC_MAX; dst++) {
340 8a35f56c 2022-07-16 thomas 				/* Allocate maximum fd integers */
341 8a35f56c 2022-07-16 thomas 				pp->pp_pipes[dst] =
342 8a35f56c 2022-07-16 thomas 				    calloc(ps->ps_instances[dst],
343 8a35f56c 2022-07-16 thomas 				    sizeof(int));
344 8a35f56c 2022-07-16 thomas 				if (pp->pp_pipes[dst] == NULL)
345 8a35f56c 2022-07-16 thomas 					fatal("%s: calloc", __func__);
346 8a35f56c 2022-07-16 thomas 
347 8a35f56c 2022-07-16 thomas 				/* Mark fd as unused */
348 8a35f56c 2022-07-16 thomas 				for (j = 0; j < ps->ps_instances[dst]; j++)
349 8a35f56c 2022-07-16 thomas 					pp->pp_pipes[dst][j] = -1;
350 8a35f56c 2022-07-16 thomas 			}
351 8a35f56c 2022-07-16 thomas 		}
352 8a35f56c 2022-07-16 thomas 	}
353 8a35f56c 2022-07-16 thomas 
354 8a35f56c 2022-07-16 thomas 	ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
355 8a35f56c 2022-07-16 thomas }
356 8a35f56c 2022-07-16 thomas 
357 8a35f56c 2022-07-16 thomas void
358 8a35f56c 2022-07-16 thomas proc_kill(struct privsep *ps)
359 8a35f56c 2022-07-16 thomas {
360 8a35f56c 2022-07-16 thomas 	char *cause;
361 8a35f56c 2022-07-16 thomas 	pid_t pid;
362 8a35f56c 2022-07-16 thomas 	int len, status;
363 8a35f56c 2022-07-16 thomas 
364 8a35f56c 2022-07-16 thomas 	if (privsep_process != PROC_GOTWEBD)
365 8a35f56c 2022-07-16 thomas 		return;
366 8a35f56c 2022-07-16 thomas 
367 8a35f56c 2022-07-16 thomas 	proc_close(ps);
368 8a35f56c 2022-07-16 thomas 
369 8a35f56c 2022-07-16 thomas 	do {
370 8a35f56c 2022-07-16 thomas 		pid = waitpid(WAIT_ANY, &status, 0);
371 8a35f56c 2022-07-16 thomas 		if (pid <= 0)
372 8a35f56c 2022-07-16 thomas 			continue;
373 8a35f56c 2022-07-16 thomas 
374 8a35f56c 2022-07-16 thomas 		if (WIFSIGNALED(status)) {
375 8a35f56c 2022-07-16 thomas 			len = asprintf(&cause, "terminated; signal %d",
376 8a35f56c 2022-07-16 thomas 			    WTERMSIG(status));
377 8a35f56c 2022-07-16 thomas 		} else if (WIFEXITED(status)) {
378 8a35f56c 2022-07-16 thomas 			if (WEXITSTATUS(status) != 0)
379 8a35f56c 2022-07-16 thomas 				len = asprintf(&cause, "exited abnormally");
380 8a35f56c 2022-07-16 thomas 			else
381 8a35f56c 2022-07-16 thomas 				len = 0;
382 8a35f56c 2022-07-16 thomas 		} else
383 8a35f56c 2022-07-16 thomas 			len = -1;
384 8a35f56c 2022-07-16 thomas 
385 8a35f56c 2022-07-16 thomas 		if (len == 0) {
386 8a35f56c 2022-07-16 thomas 			/* child exited OK, don't print a warning message */
387 8a35f56c 2022-07-16 thomas 		} else if (len != -1) {
388 8a35f56c 2022-07-16 thomas 			log_warnx("lost child: pid %u %s", pid, cause);
389 8a35f56c 2022-07-16 thomas 			free(cause);
390 8a35f56c 2022-07-16 thomas 		} else
391 8a35f56c 2022-07-16 thomas 			log_warnx("lost child: pid %u", pid);
392 8a35f56c 2022-07-16 thomas 	} while (pid != -1 || (pid == -1 && errno == EINTR));
393 8a35f56c 2022-07-16 thomas }
394 8a35f56c 2022-07-16 thomas 
395 8a35f56c 2022-07-16 thomas void
396 8a35f56c 2022-07-16 thomas proc_open(struct privsep *ps, int src, int dst)
397 8a35f56c 2022-07-16 thomas {
398 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pa, *pb;
399 8a35f56c 2022-07-16 thomas 	struct privsep_fd pf;
400 8a35f56c 2022-07-16 thomas 	int fds[2];
401 8a35f56c 2022-07-16 thomas 	unsigned int i, j;
402 8a35f56c 2022-07-16 thomas 
403 8a35f56c 2022-07-16 thomas 	/* Exchange pipes between process. */
404 8a35f56c 2022-07-16 thomas 	for (i = 0; i < ps->ps_instances[src]; i++) {
405 8a35f56c 2022-07-16 thomas 		for (j = 0; j < ps->ps_instances[dst]; j++) {
406 8a35f56c 2022-07-16 thomas 			/* Don't create sockets for ourself. */
407 8a35f56c 2022-07-16 thomas 			if (src == dst && i == j)
408 8a35f56c 2022-07-16 thomas 				continue;
409 8a35f56c 2022-07-16 thomas 
410 8a35f56c 2022-07-16 thomas 			pa = &ps->ps_pipes[src][i];
411 8a35f56c 2022-07-16 thomas 			pb = &ps->ps_pipes[dst][j];
412 dd7a7d5b 2022-07-16 thomas 			int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
413 dd7a7d5b 2022-07-16 thomas #ifdef SOCK_CLOEXEC
414 dd7a7d5b 2022-07-16 thomas 			sock_flags |= SOCK_CLOEXEC;
415 dd7a7d5b 2022-07-16 thomas #endif
416 dd7a7d5b 2022-07-16 thomas 			if (socketpair(AF_UNIX, sock_flags,
417 8a35f56c 2022-07-16 thomas 			    PF_UNSPEC, fds) == -1)
418 8a35f56c 2022-07-16 thomas 				fatal("%s: socketpair", __func__);
419 8a35f56c 2022-07-16 thomas 
420 8a35f56c 2022-07-16 thomas 			pa->pp_pipes[dst][j] = fds[0];
421 8a35f56c 2022-07-16 thomas 			pb->pp_pipes[src][i] = fds[1];
422 8a35f56c 2022-07-16 thomas 
423 8a35f56c 2022-07-16 thomas 			pf.pf_procid = src;
424 8a35f56c 2022-07-16 thomas 			pf.pf_instance = i;
425 8a35f56c 2022-07-16 thomas 			if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
426 8a35f56c 2022-07-16 thomas 			    -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
427 8a35f56c 2022-07-16 thomas 				fatal("%s: proc_compose_imsg", __func__);
428 8a35f56c 2022-07-16 thomas 
429 8a35f56c 2022-07-16 thomas 			pf.pf_procid = dst;
430 8a35f56c 2022-07-16 thomas 			pf.pf_instance = j;
431 8a35f56c 2022-07-16 thomas 			if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
432 8a35f56c 2022-07-16 thomas 			    -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
433 8a35f56c 2022-07-16 thomas 				fatal("%s: proc_compose_imsg", __func__);
434 8a35f56c 2022-07-16 thomas 
435 8a35f56c 2022-07-16 thomas 			/*
436 8a35f56c 2022-07-16 thomas 			 * We have to flush to send the descriptors and close
437 8a35f56c 2022-07-16 thomas 			 * them to avoid the fd ramp on startup.
438 8a35f56c 2022-07-16 thomas 			 */
439 8a35f56c 2022-07-16 thomas 			if (proc_flush_imsg(ps, src, i) == -1 ||
440 8a35f56c 2022-07-16 thomas 			    proc_flush_imsg(ps, dst, j) == -1)
441 8a35f56c 2022-07-16 thomas 				fatal("%s: imsg_flush", __func__);
442 8a35f56c 2022-07-16 thomas 		}
443 8a35f56c 2022-07-16 thomas 	}
444 8a35f56c 2022-07-16 thomas }
445 8a35f56c 2022-07-16 thomas 
446 8a35f56c 2022-07-16 thomas void
447 8a35f56c 2022-07-16 thomas proc_close(struct privsep *ps)
448 8a35f56c 2022-07-16 thomas {
449 8a35f56c 2022-07-16 thomas 	unsigned int dst, n;
450 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp;
451 8a35f56c 2022-07-16 thomas 
452 8a35f56c 2022-07-16 thomas 	if (ps == NULL)
453 8a35f56c 2022-07-16 thomas 		return;
454 8a35f56c 2022-07-16 thomas 
455 8a35f56c 2022-07-16 thomas 	pp = ps->ps_pp;
456 8a35f56c 2022-07-16 thomas 
457 8a35f56c 2022-07-16 thomas 	for (dst = 0; dst < PROC_MAX; dst++) {
458 8a35f56c 2022-07-16 thomas 		if (ps->ps_ievs[dst] == NULL)
459 8a35f56c 2022-07-16 thomas 			continue;
460 8a35f56c 2022-07-16 thomas 
461 8a35f56c 2022-07-16 thomas 		for (n = 0; n < ps->ps_instances[dst]; n++) {
462 8a35f56c 2022-07-16 thomas 			if (pp->pp_pipes[dst][n] == -1)
463 8a35f56c 2022-07-16 thomas 				continue;
464 8a35f56c 2022-07-16 thomas 
465 8a35f56c 2022-07-16 thomas 			/* Cancel the fd, close and invalidate the fd */
466 8a35f56c 2022-07-16 thomas 			event_del(&(ps->ps_ievs[dst][n].ev));
467 8a35f56c 2022-07-16 thomas 			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
468 8a35f56c 2022-07-16 thomas 			close(pp->pp_pipes[dst][n]);
469 8a35f56c 2022-07-16 thomas 			pp->pp_pipes[dst][n] = -1;
470 8a35f56c 2022-07-16 thomas 		}
471 8a35f56c 2022-07-16 thomas 		free(ps->ps_ievs[dst]);
472 8a35f56c 2022-07-16 thomas 	}
473 8a35f56c 2022-07-16 thomas }
474 8a35f56c 2022-07-16 thomas 
475 8a35f56c 2022-07-16 thomas void
476 8a35f56c 2022-07-16 thomas proc_shutdown(struct privsep_proc *p)
477 8a35f56c 2022-07-16 thomas {
478 8a35f56c 2022-07-16 thomas 	struct privsep *ps = p->p_ps;
479 8a35f56c 2022-07-16 thomas 
480 8a35f56c 2022-07-16 thomas 	if (p->p_shutdown != NULL)
481 8a35f56c 2022-07-16 thomas 		(*p->p_shutdown)();
482 8a35f56c 2022-07-16 thomas 
483 8a35f56c 2022-07-16 thomas 	proc_close(ps);
484 8a35f56c 2022-07-16 thomas 
485 8a35f56c 2022-07-16 thomas 	log_info("%s, %s exiting, pid %d", getprogname(), p->p_title, getpid());
486 8a35f56c 2022-07-16 thomas 
487 8a35f56c 2022-07-16 thomas 	exit(0);
488 8a35f56c 2022-07-16 thomas }
489 8a35f56c 2022-07-16 thomas 
490 8a35f56c 2022-07-16 thomas void
491 8a35f56c 2022-07-16 thomas proc_sig_handler(int sig, short event, void *arg)
492 8a35f56c 2022-07-16 thomas {
493 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = arg;
494 8a35f56c 2022-07-16 thomas 
495 8a35f56c 2022-07-16 thomas 	switch (sig) {
496 8a35f56c 2022-07-16 thomas 	case SIGINT:
497 8a35f56c 2022-07-16 thomas 	case SIGTERM:
498 8a35f56c 2022-07-16 thomas 		proc_shutdown(p);
499 8a35f56c 2022-07-16 thomas 		break;
500 8a35f56c 2022-07-16 thomas 	case SIGCHLD:
501 8a35f56c 2022-07-16 thomas 	case SIGHUP:
502 8a35f56c 2022-07-16 thomas 	case SIGPIPE:
503 8a35f56c 2022-07-16 thomas 	case SIGUSR1:
504 8a35f56c 2022-07-16 thomas 		/* ignore */
505 8a35f56c 2022-07-16 thomas 		break;
506 8a35f56c 2022-07-16 thomas 	default:
507 8a35f56c 2022-07-16 thomas 		fatalx("proc_sig_handler: unexpected signal");
508 8a35f56c 2022-07-16 thomas 		/* NOTREACHED */
509 8a35f56c 2022-07-16 thomas 	}
510 8a35f56c 2022-07-16 thomas }
511 8a35f56c 2022-07-16 thomas 
512 8a35f56c 2022-07-16 thomas void
513 8a35f56c 2022-07-16 thomas proc_run(struct privsep *ps, struct privsep_proc *p,
514 8a35f56c 2022-07-16 thomas     struct privsep_proc *procs, unsigned int nproc,
515 8a35f56c 2022-07-16 thomas     void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
516 8a35f56c 2022-07-16 thomas {
517 8a35f56c 2022-07-16 thomas 	struct passwd *pw;
518 8a35f56c 2022-07-16 thomas 	const char *root;
519 8a35f56c 2022-07-16 thomas 
520 8a35f56c 2022-07-16 thomas 	log_procinit(p->p_title);
521 8a35f56c 2022-07-16 thomas 
522 8a35f56c 2022-07-16 thomas 	/* Set the process group of the current process */
523 8a35f56c 2022-07-16 thomas 	setpgid(0, 0);
524 8a35f56c 2022-07-16 thomas 
525 8a35f56c 2022-07-16 thomas 	/* Use non-standard user */
526 8a35f56c 2022-07-16 thomas 	if (p->p_pw != NULL)
527 8a35f56c 2022-07-16 thomas 		pw = p->p_pw;
528 8a35f56c 2022-07-16 thomas 	else
529 8a35f56c 2022-07-16 thomas 		pw = ps->ps_pw;
530 8a35f56c 2022-07-16 thomas 
531 8a35f56c 2022-07-16 thomas 	/* Change root directory */
532 8a35f56c 2022-07-16 thomas 	if (p->p_chroot != NULL)
533 8a35f56c 2022-07-16 thomas 		root = p->p_chroot;
534 8a35f56c 2022-07-16 thomas 	else
535 8a35f56c 2022-07-16 thomas 		root = pw->pw_dir;
536 8a35f56c 2022-07-16 thomas 
537 8a35f56c 2022-07-16 thomas 	if (chroot(root) == -1)
538 8a35f56c 2022-07-16 thomas 		fatal("proc_run: chroot");
539 8a35f56c 2022-07-16 thomas 	if (chdir("/") == -1)
540 8a35f56c 2022-07-16 thomas 		fatal("proc_run: chdir(\"/\")");
541 8a35f56c 2022-07-16 thomas 
542 8a35f56c 2022-07-16 thomas 	privsep_process = p->p_id;
543 8a35f56c 2022-07-16 thomas 
544 8a35f56c 2022-07-16 thomas 	setproctitle("%s", p->p_title);
545 8a35f56c 2022-07-16 thomas 
546 8a35f56c 2022-07-16 thomas 	if (setgroups(1, &pw->pw_gid) ||
547 8a35f56c 2022-07-16 thomas 	    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
548 8a35f56c 2022-07-16 thomas 	    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
549 8a35f56c 2022-07-16 thomas 		fatal("proc_run: cannot drop privileges");
550 8a35f56c 2022-07-16 thomas 
551 8a35f56c 2022-07-16 thomas 	event_init();
552 8a35f56c 2022-07-16 thomas 
553 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
554 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
555 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
556 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
557 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
558 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
559 8a35f56c 2022-07-16 thomas 
560 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigint, NULL);
561 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigterm, NULL);
562 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigchld, NULL);
563 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsighup, NULL);
564 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigpipe, NULL);
565 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigusr1, NULL);
566 8a35f56c 2022-07-16 thomas 
567 8a35f56c 2022-07-16 thomas 	proc_setup(ps, procs, nproc);
568 8a35f56c 2022-07-16 thomas 	proc_accept(ps, PROC_GOTWEBD_SOCK_FILENO, PROC_GOTWEBD, 0);
569 8a35f56c 2022-07-16 thomas 
570 8a35f56c 2022-07-16 thomas 	DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title,
571 8a35f56c 2022-07-16 thomas 	    ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
572 8a35f56c 2022-07-16 thomas 
573 8a35f56c 2022-07-16 thomas 	if (run != NULL)
574 8a35f56c 2022-07-16 thomas 		run(ps, p, arg);
575 8a35f56c 2022-07-16 thomas 
576 8a35f56c 2022-07-16 thomas 	event_dispatch();
577 8a35f56c 2022-07-16 thomas 
578 8a35f56c 2022-07-16 thomas 	proc_shutdown(p);
579 8a35f56c 2022-07-16 thomas }
580 8a35f56c 2022-07-16 thomas 
581 8a35f56c 2022-07-16 thomas void
582 8a35f56c 2022-07-16 thomas proc_dispatch(int fd, short event, void *arg)
583 8a35f56c 2022-07-16 thomas {
584 8a35f56c 2022-07-16 thomas 	struct imsgev *iev = arg;
585 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = iev->proc;
586 8a35f56c 2022-07-16 thomas 	struct privsep *ps = p->p_ps;
587 8a35f56c 2022-07-16 thomas 	struct imsgbuf *ibuf;
588 8a35f56c 2022-07-16 thomas 	struct imsg imsg;
589 8a35f56c 2022-07-16 thomas 	ssize_t n;
590 8a35f56c 2022-07-16 thomas 	int verbose;
591 8a35f56c 2022-07-16 thomas 	const char *title;
592 8a35f56c 2022-07-16 thomas 	struct privsep_fd pf;
593 8a35f56c 2022-07-16 thomas 
594 8a35f56c 2022-07-16 thomas 	title = ps->ps_title[privsep_process];
595 8a35f56c 2022-07-16 thomas 	ibuf = &iev->ibuf;
596 8a35f56c 2022-07-16 thomas 
597 8a35f56c 2022-07-16 thomas 	if (event & EV_READ) {
598 8a35f56c 2022-07-16 thomas 		n = imsg_read(ibuf);
599 8a35f56c 2022-07-16 thomas 		if (n == -1 && errno != EAGAIN)
600 8a35f56c 2022-07-16 thomas 			fatal("%s: imsg_read", __func__);
601 8a35f56c 2022-07-16 thomas 		if (n == 0) {
602 8a35f56c 2022-07-16 thomas 			/* this pipe is dead, so remove the event handler */
603 8a35f56c 2022-07-16 thomas 			event_del(&iev->ev);
604 8a35f56c 2022-07-16 thomas 			event_loopexit(NULL);
605 8a35f56c 2022-07-16 thomas 			return;
606 8a35f56c 2022-07-16 thomas 		}
607 8a35f56c 2022-07-16 thomas 	}
608 8a35f56c 2022-07-16 thomas 
609 8a35f56c 2022-07-16 thomas 	if (event & EV_WRITE) {
610 8a35f56c 2022-07-16 thomas 		n = msgbuf_write(&ibuf->w);
611 8a35f56c 2022-07-16 thomas 		if (n == -1 && errno != EAGAIN)
612 8a35f56c 2022-07-16 thomas 			fatal("%s: msgbuf_write", __func__);
613 8a35f56c 2022-07-16 thomas 		if (n == 0) {
614 8a35f56c 2022-07-16 thomas 			/* this pipe is dead, so remove the event handler */
615 8a35f56c 2022-07-16 thomas 			event_del(&iev->ev);
616 8a35f56c 2022-07-16 thomas 			event_loopexit(NULL);
617 8a35f56c 2022-07-16 thomas 			return;
618 8a35f56c 2022-07-16 thomas 		}
619 8a35f56c 2022-07-16 thomas 	}
620 8a35f56c 2022-07-16 thomas 
621 8a35f56c 2022-07-16 thomas 	for (;;) {
622 8a35f56c 2022-07-16 thomas 		n = imsg_get(ibuf, &imsg);
623 8a35f56c 2022-07-16 thomas 		if (n == -1)
624 8a35f56c 2022-07-16 thomas 			fatal("%s: imsg_get", __func__);
625 8a35f56c 2022-07-16 thomas 		if (n == 0)
626 8a35f56c 2022-07-16 thomas 			break;
627 8a35f56c 2022-07-16 thomas 
628 8a35f56c 2022-07-16 thomas #if DEBUG > 1
629 8a35f56c 2022-07-16 thomas 		log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
630 8a35f56c 2022-07-16 thomas 		    __func__, title, ps->ps_instance + 1,
631 8a35f56c 2022-07-16 thomas 		    imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
632 8a35f56c 2022-07-16 thomas #endif
633 8a35f56c 2022-07-16 thomas 
634 8a35f56c 2022-07-16 thomas 		/*
635 8a35f56c 2022-07-16 thomas 		 * Check the message with the program callback
636 8a35f56c 2022-07-16 thomas 		 */
637 8a35f56c 2022-07-16 thomas 		if ((p->p_cb)(fd, p, &imsg) == 0) {
638 8a35f56c 2022-07-16 thomas 			/* Message was handled by the callback, continue */
639 8a35f56c 2022-07-16 thomas 			imsg_free(&imsg);
640 8a35f56c 2022-07-16 thomas 			continue;
641 8a35f56c 2022-07-16 thomas 		}
642 8a35f56c 2022-07-16 thomas 
643 8a35f56c 2022-07-16 thomas 		/*
644 8a35f56c 2022-07-16 thomas 		 * Generic message handling
645 8a35f56c 2022-07-16 thomas 		 */
646 8a35f56c 2022-07-16 thomas 		switch (imsg.hdr.type) {
647 8a35f56c 2022-07-16 thomas 		case IMSG_CTL_VERBOSE:
648 8a35f56c 2022-07-16 thomas 			log_info("%s", __func__);
649 8a35f56c 2022-07-16 thomas 			IMSG_SIZE_CHECK(&imsg, &verbose);
650 8a35f56c 2022-07-16 thomas 			memcpy(&verbose, imsg.data, sizeof(verbose));
651 8a35f56c 2022-07-16 thomas 			log_setverbose(verbose);
652 8a35f56c 2022-07-16 thomas 			break;
653 8a35f56c 2022-07-16 thomas 		case IMSG_CTL_PROCFD:
654 8a35f56c 2022-07-16 thomas 			IMSG_SIZE_CHECK(&imsg, &pf);
655 8a35f56c 2022-07-16 thomas 			memcpy(&pf, imsg.data, sizeof(pf));
656 8a35f56c 2022-07-16 thomas 			proc_accept(ps, imsg.fd, pf.pf_procid,
657 8a35f56c 2022-07-16 thomas 			    pf.pf_instance);
658 8a35f56c 2022-07-16 thomas 			break;
659 8a35f56c 2022-07-16 thomas 		default:
660 8a35f56c 2022-07-16 thomas 			log_warnx("%s: %s %d got invalid imsg %d peerid %d "
661 8a35f56c 2022-07-16 thomas 			    "from %s %d",
662 8a35f56c 2022-07-16 thomas 			    __func__, title, ps->ps_instance + 1,
663 8a35f56c 2022-07-16 thomas 			    imsg.hdr.type, imsg.hdr.peerid,
664 8a35f56c 2022-07-16 thomas 			    p->p_title, imsg.hdr.pid);
665 8a35f56c 2022-07-16 thomas 		}
666 8a35f56c 2022-07-16 thomas 		imsg_free(&imsg);
667 8a35f56c 2022-07-16 thomas 	}
668 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
669 8a35f56c 2022-07-16 thomas }
670 8a35f56c 2022-07-16 thomas 
671 8a35f56c 2022-07-16 thomas int
672 8a35f56c 2022-07-16 thomas proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
673 8a35f56c 2022-07-16 thomas {
674 8a35f56c 2022-07-16 thomas 	return (-1);
675 8a35f56c 2022-07-16 thomas }
676 8a35f56c 2022-07-16 thomas 
677 8a35f56c 2022-07-16 thomas /*
678 8a35f56c 2022-07-16 thomas  * imsg helper functions
679 8a35f56c 2022-07-16 thomas  */
680 8a35f56c 2022-07-16 thomas 
681 8a35f56c 2022-07-16 thomas void
682 8a35f56c 2022-07-16 thomas imsg_event_add(struct imsgev *iev)
683 8a35f56c 2022-07-16 thomas {
684 8a35f56c 2022-07-16 thomas 	if (iev->handler == NULL) {
685 8a35f56c 2022-07-16 thomas 		imsg_flush(&iev->ibuf);
686 8a35f56c 2022-07-16 thomas 		return;
687 8a35f56c 2022-07-16 thomas 	}
688 8a35f56c 2022-07-16 thomas 
689 8a35f56c 2022-07-16 thomas 	iev->events = EV_READ;
690 8a35f56c 2022-07-16 thomas 	if (iev->ibuf.w.queued)
691 8a35f56c 2022-07-16 thomas 		iev->events |= EV_WRITE;
692 8a35f56c 2022-07-16 thomas 
693 8a35f56c 2022-07-16 thomas 	event_del(&iev->ev);
694 8a35f56c 2022-07-16 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
695 8a35f56c 2022-07-16 thomas 	event_add(&iev->ev, NULL);
696 8a35f56c 2022-07-16 thomas }
697 8a35f56c 2022-07-16 thomas 
698 8a35f56c 2022-07-16 thomas int
699 8a35f56c 2022-07-16 thomas imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
700 8a35f56c 2022-07-16 thomas     pid_t pid, int fd, void *data, uint16_t datalen)
701 8a35f56c 2022-07-16 thomas {
702 8a35f56c 2022-07-16 thomas 	int ret;
703 8a35f56c 2022-07-16 thomas 
704 8a35f56c 2022-07-16 thomas 	ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen);
705 8a35f56c 2022-07-16 thomas 	if (ret == -1)
706 8a35f56c 2022-07-16 thomas 		return (ret);
707 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
708 8a35f56c 2022-07-16 thomas 	return (ret);
709 8a35f56c 2022-07-16 thomas }
710 8a35f56c 2022-07-16 thomas 
711 8a35f56c 2022-07-16 thomas int
712 8a35f56c 2022-07-16 thomas imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
713 8a35f56c 2022-07-16 thomas     pid_t pid, int fd, const struct iovec *iov, int iovcnt)
714 8a35f56c 2022-07-16 thomas {
715 8a35f56c 2022-07-16 thomas 	int ret;
716 8a35f56c 2022-07-16 thomas 
717 8a35f56c 2022-07-16 thomas 	ret = imsg_composev(&iev->ibuf, type, peerid, pid, fd, iov, iovcnt);
718 8a35f56c 2022-07-16 thomas 	if (ret == -1)
719 8a35f56c 2022-07-16 thomas 		return (ret);
720 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
721 8a35f56c 2022-07-16 thomas 	return (ret);
722 8a35f56c 2022-07-16 thomas }
723 8a35f56c 2022-07-16 thomas 
724 8a35f56c 2022-07-16 thomas void
725 8a35f56c 2022-07-16 thomas proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
726 8a35f56c 2022-07-16 thomas {
727 8a35f56c 2022-07-16 thomas 	if (*n == -1) {
728 8a35f56c 2022-07-16 thomas 		/* Use a range of all target instances */
729 8a35f56c 2022-07-16 thomas 		*n = 0;
730 8a35f56c 2022-07-16 thomas 		*m = ps->ps_instances[id];
731 8a35f56c 2022-07-16 thomas 	} else {
732 8a35f56c 2022-07-16 thomas 		/* Use only a single slot of the specified peer process */
733 8a35f56c 2022-07-16 thomas 		*m = *n + 1;
734 8a35f56c 2022-07-16 thomas 	}
735 8a35f56c 2022-07-16 thomas }
736 8a35f56c 2022-07-16 thomas 
737 8a35f56c 2022-07-16 thomas int
738 8a35f56c 2022-07-16 thomas proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
739 8a35f56c 2022-07-16 thomas     uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
740 8a35f56c 2022-07-16 thomas {
741 8a35f56c 2022-07-16 thomas 	int m;
742 8a35f56c 2022-07-16 thomas 
743 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
744 8a35f56c 2022-07-16 thomas 	for (; n < m; n++) {
745 8a35f56c 2022-07-16 thomas 		if (imsg_compose_event(&ps->ps_ievs[id][n],
746 8a35f56c 2022-07-16 thomas 		    type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
747 8a35f56c 2022-07-16 thomas 			return (-1);
748 8a35f56c 2022-07-16 thomas 	}
749 8a35f56c 2022-07-16 thomas 
750 8a35f56c 2022-07-16 thomas 	return (0);
751 8a35f56c 2022-07-16 thomas }
752 8a35f56c 2022-07-16 thomas 
753 8a35f56c 2022-07-16 thomas int
754 8a35f56c 2022-07-16 thomas proc_compose(struct privsep *ps, enum privsep_procid id,
755 8a35f56c 2022-07-16 thomas     uint16_t type, void *data, uint16_t datalen)
756 8a35f56c 2022-07-16 thomas {
757 8a35f56c 2022-07-16 thomas 	return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
758 8a35f56c 2022-07-16 thomas }
759 8a35f56c 2022-07-16 thomas 
760 8a35f56c 2022-07-16 thomas int
761 8a35f56c 2022-07-16 thomas proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
762 8a35f56c 2022-07-16 thomas     uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
763 8a35f56c 2022-07-16 thomas {
764 8a35f56c 2022-07-16 thomas 	int m;
765 8a35f56c 2022-07-16 thomas 
766 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
767 8a35f56c 2022-07-16 thomas 	for (; n < m; n++)
768 8a35f56c 2022-07-16 thomas 		if (imsg_composev_event(&ps->ps_ievs[id][n],
769 8a35f56c 2022-07-16 thomas 		    type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
770 8a35f56c 2022-07-16 thomas 			return (-1);
771 8a35f56c 2022-07-16 thomas 
772 8a35f56c 2022-07-16 thomas 	return (0);
773 8a35f56c 2022-07-16 thomas }
774 8a35f56c 2022-07-16 thomas 
775 8a35f56c 2022-07-16 thomas int
776 8a35f56c 2022-07-16 thomas proc_composev(struct privsep *ps, enum privsep_procid id,
777 8a35f56c 2022-07-16 thomas     uint16_t type, const struct iovec *iov, int iovcnt)
778 8a35f56c 2022-07-16 thomas {
779 8a35f56c 2022-07-16 thomas 	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
780 8a35f56c 2022-07-16 thomas }
781 8a35f56c 2022-07-16 thomas 
782 8a35f56c 2022-07-16 thomas int
783 8a35f56c 2022-07-16 thomas proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
784 8a35f56c 2022-07-16 thomas     enum privsep_procid id, int n)
785 8a35f56c 2022-07-16 thomas {
786 8a35f56c 2022-07-16 thomas 	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
787 8a35f56c 2022-07-16 thomas 	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
788 8a35f56c 2022-07-16 thomas }
789 8a35f56c 2022-07-16 thomas 
790 8a35f56c 2022-07-16 thomas struct imsgbuf *
791 8a35f56c 2022-07-16 thomas proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
792 8a35f56c 2022-07-16 thomas {
793 8a35f56c 2022-07-16 thomas 	int m;
794 8a35f56c 2022-07-16 thomas 
795 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
796 8a35f56c 2022-07-16 thomas 	return (&ps->ps_ievs[id][n].ibuf);
797 8a35f56c 2022-07-16 thomas }
798 8a35f56c 2022-07-16 thomas 
799 8a35f56c 2022-07-16 thomas struct imsgev *
800 8a35f56c 2022-07-16 thomas proc_iev(struct privsep *ps, enum privsep_procid id, int n)
801 8a35f56c 2022-07-16 thomas {
802 8a35f56c 2022-07-16 thomas 	int m;
803 8a35f56c 2022-07-16 thomas 
804 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
805 8a35f56c 2022-07-16 thomas 	return (&ps->ps_ievs[id][n]);
806 8a35f56c 2022-07-16 thomas }
807 8a35f56c 2022-07-16 thomas 
808 8a35f56c 2022-07-16 thomas /* This function should only be called with care as it breaks async I/O */
809 8a35f56c 2022-07-16 thomas int
810 8a35f56c 2022-07-16 thomas proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
811 8a35f56c 2022-07-16 thomas {
812 8a35f56c 2022-07-16 thomas 	struct imsgbuf *ibuf;
813 8a35f56c 2022-07-16 thomas 	int m, ret = 0;
814 8a35f56c 2022-07-16 thomas 
815 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
816 8a35f56c 2022-07-16 thomas 	for (; n < m; n++) {
817 8a35f56c 2022-07-16 thomas 		ibuf = proc_ibuf(ps, id, n);
818 8a35f56c 2022-07-16 thomas 		if (ibuf == NULL)
819 8a35f56c 2022-07-16 thomas 			return (-1);
820 8a35f56c 2022-07-16 thomas 		do {
821 8a35f56c 2022-07-16 thomas 			ret = imsg_flush(ibuf);
822 8a35f56c 2022-07-16 thomas 		} while (ret == -1 && errno == EAGAIN);
823 8a35f56c 2022-07-16 thomas 		if (ret == -1)
824 8a35f56c 2022-07-16 thomas 			break;
825 8a35f56c 2022-07-16 thomas 		imsg_event_add(&ps->ps_ievs[id][n]);
826 8a35f56c 2022-07-16 thomas 	}
827 8a35f56c 2022-07-16 thomas 
828 8a35f56c 2022-07-16 thomas 	return (ret);
829 8a35f56c 2022-07-16 thomas }