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 int	 proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
 44 8a35f56c 2022-07-16 thomas void	 proc_shutdown(struct privsep_proc *);
 45 8a35f56c 2022-07-16 thomas void	 proc_sig_handler(int, short, void *);
 46 8a35f56c 2022-07-16 thomas int	 proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
 47 8a35f56c 2022-07-16 thomas 
 48 8a35f56c 2022-07-16 thomas enum privsep_procid privsep_process;
 49 8a35f56c 2022-07-16 thomas 
 50 8a35f56c 2022-07-16 thomas int
 51 8a35f56c 2022-07-16 thomas proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
 52 8a35f56c 2022-07-16 thomas     enum privsep_procid type)
 53 8a35f56c 2022-07-16 thomas {
 54 8a35f56c 2022-07-16 thomas 	unsigned int i;
 55 8a35f56c 2022-07-16 thomas 
 56 8a35f56c 2022-07-16 thomas 	for (i = 0; i < nproc; i++)
 57 8a35f56c 2022-07-16 thomas 		if (procs[i].p_id == type)
 58 8a35f56c 2022-07-16 thomas 			return (1);
 59 8a35f56c 2022-07-16 thomas 
 60 8a35f56c 2022-07-16 thomas 	return (0);
 61 8a35f56c 2022-07-16 thomas }
 62 8a35f56c 2022-07-16 thomas 
 63 8a35f56c 2022-07-16 thomas enum privsep_procid
 64 8a35f56c 2022-07-16 thomas proc_getid(struct privsep_proc *procs, unsigned int nproc,
 65 8a35f56c 2022-07-16 thomas     const char *proc_name)
 66 8a35f56c 2022-07-16 thomas {
 67 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p;
 68 8a35f56c 2022-07-16 thomas 	unsigned int proc;
 69 8a35f56c 2022-07-16 thomas 
 70 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
 71 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
 72 8a35f56c 2022-07-16 thomas 		if (strcmp(p->p_title, proc_name))
 73 8a35f56c 2022-07-16 thomas 			continue;
 74 8a35f56c 2022-07-16 thomas 
 75 8a35f56c 2022-07-16 thomas 		return (p->p_id);
 76 8a35f56c 2022-07-16 thomas 	}
 77 8a35f56c 2022-07-16 thomas 
 78 8a35f56c 2022-07-16 thomas 	return (PROC_MAX);
 79 8a35f56c 2022-07-16 thomas }
 80 8a35f56c 2022-07-16 thomas 
 81 8a35f56c 2022-07-16 thomas void
 82 8a35f56c 2022-07-16 thomas proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
 83 8a35f56c 2022-07-16 thomas     int argc, char **argv)
 84 8a35f56c 2022-07-16 thomas {
 85 8a35f56c 2022-07-16 thomas 	unsigned int proc, nargc, i, proc_i;
 86 8a35f56c 2022-07-16 thomas 	char **nargv;
 87 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p;
 88 8a35f56c 2022-07-16 thomas 	char num[32];
 89 8a35f56c 2022-07-16 thomas 	int fd;
 90 8a35f56c 2022-07-16 thomas 
 91 8a35f56c 2022-07-16 thomas 	/* Prepare the new process argv. */
 92 8a35f56c 2022-07-16 thomas 	nargv = calloc(argc + 5, sizeof(char *));
 93 8a35f56c 2022-07-16 thomas 	if (nargv == NULL)
 94 8a35f56c 2022-07-16 thomas 		fatal("%s: calloc", __func__);
 95 8a35f56c 2022-07-16 thomas 
 96 8a35f56c 2022-07-16 thomas 	/* Copy call argument first. */
 97 8a35f56c 2022-07-16 thomas 	nargc = 0;
 98 8a35f56c 2022-07-16 thomas 	nargv[nargc++] = argv[0];
 99 8a35f56c 2022-07-16 thomas 
100 8a35f56c 2022-07-16 thomas 	/* Set process name argument and save the position. */
101 8a35f56c 2022-07-16 thomas 	nargv[nargc] = strdup("-P");
102 8a35f56c 2022-07-16 thomas 	if (nargv[nargc] == NULL)
103 8a35f56c 2022-07-16 thomas 		fatal("%s: strdup", __func__);
104 8a35f56c 2022-07-16 thomas 	nargc++;
105 8a35f56c 2022-07-16 thomas 	proc_i = nargc;
106 8a35f56c 2022-07-16 thomas 	nargc++;
107 8a35f56c 2022-07-16 thomas 
108 8a35f56c 2022-07-16 thomas 	/* Point process instance arg to stack and copy the original args. */
109 8a35f56c 2022-07-16 thomas 	nargv[nargc] = strdup("-I");
110 8a35f56c 2022-07-16 thomas 	if (nargv[nargc] == NULL)
111 8a35f56c 2022-07-16 thomas 		fatal("%s: strdup", __func__);
112 8a35f56c 2022-07-16 thomas 	nargc++;
113 8a35f56c 2022-07-16 thomas 	nargv[nargc++] = num;
114 8a35f56c 2022-07-16 thomas 	for (i = 1; i < (unsigned int) argc; i++)
115 8a35f56c 2022-07-16 thomas 		nargv[nargc++] = argv[i];
116 8a35f56c 2022-07-16 thomas 
117 8a35f56c 2022-07-16 thomas 	nargv[nargc] = NULL;
118 8a35f56c 2022-07-16 thomas 
119 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
120 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
121 8a35f56c 2022-07-16 thomas 
122 8a35f56c 2022-07-16 thomas 		/* Update args with process title. */
123 8a35f56c 2022-07-16 thomas 		nargv[proc_i] = (char *)(uintptr_t)p->p_title;
124 8a35f56c 2022-07-16 thomas 
125 8a35f56c 2022-07-16 thomas 		/* Fire children processes. */
126 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
127 8a35f56c 2022-07-16 thomas 			/* Update the process instance number. */
128 8a35f56c 2022-07-16 thomas 			snprintf(num, sizeof(num), "%u", i);
129 8a35f56c 2022-07-16 thomas 
130 8a35f56c 2022-07-16 thomas 			fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0];
131 8a35f56c 2022-07-16 thomas 			ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0] = -1;
132 8a35f56c 2022-07-16 thomas 
133 8a35f56c 2022-07-16 thomas 			switch (fork()) {
134 8a35f56c 2022-07-16 thomas 			case -1:
135 8a35f56c 2022-07-16 thomas 				fatal("%s: fork", __func__);
136 8a35f56c 2022-07-16 thomas 				break;
137 8a35f56c 2022-07-16 thomas 			case 0:
138 8a35f56c 2022-07-16 thomas 				/* First create a new session */
139 8a35f56c 2022-07-16 thomas 				if (setsid() == -1)
140 8a35f56c 2022-07-16 thomas 					fatal("setsid");
141 8a35f56c 2022-07-16 thomas 
142 8a35f56c 2022-07-16 thomas 				/* Prepare parent socket. */
143 8a35f56c 2022-07-16 thomas 				if (fd != PROC_GOTWEBD_SOCK_FILENO) {
144 8a35f56c 2022-07-16 thomas 					if (dup2(fd, PROC_GOTWEBD_SOCK_FILENO)
145 8a35f56c 2022-07-16 thomas 					    == -1)
146 8a35f56c 2022-07-16 thomas 						fatal("dup2");
147 8a35f56c 2022-07-16 thomas 				} else if (fcntl(fd, F_SETFD, 0) == -1)
148 8a35f56c 2022-07-16 thomas 					fatal("fcntl");
149 8a35f56c 2022-07-16 thomas 
150 8a35f56c 2022-07-16 thomas 				execvp(argv[0], nargv);
151 8a35f56c 2022-07-16 thomas 				fatal("%s: execvp", __func__);
152 8a35f56c 2022-07-16 thomas 				break;
153 8a35f56c 2022-07-16 thomas 			default:
154 8a35f56c 2022-07-16 thomas 				/* Close child end. */
155 8a35f56c 2022-07-16 thomas 				close(fd);
156 8a35f56c 2022-07-16 thomas 				break;
157 8a35f56c 2022-07-16 thomas 			}
158 8a35f56c 2022-07-16 thomas 		}
159 8a35f56c 2022-07-16 thomas 	}
160 8a35f56c 2022-07-16 thomas 
161 8a35f56c 2022-07-16 thomas 	free(nargv);
162 8a35f56c 2022-07-16 thomas }
163 8a35f56c 2022-07-16 thomas 
164 8a35f56c 2022-07-16 thomas void
165 8a35f56c 2022-07-16 thomas proc_connect(struct privsep *ps)
166 8a35f56c 2022-07-16 thomas {
167 8a35f56c 2022-07-16 thomas 	struct imsgev *iev;
168 8a35f56c 2022-07-16 thomas 	unsigned int src, dst, inst;
169 8a35f56c 2022-07-16 thomas 
170 8a35f56c 2022-07-16 thomas 	/* Don't distribute any sockets if we are not really going to run. */
171 8a35f56c 2022-07-16 thomas 	if (ps->ps_noaction)
172 8a35f56c 2022-07-16 thomas 		return;
173 8a35f56c 2022-07-16 thomas 
174 8a35f56c 2022-07-16 thomas 	for (dst = 0; dst < PROC_MAX; dst++) {
175 8a35f56c 2022-07-16 thomas 		/* We don't communicate with ourselves. */
176 8a35f56c 2022-07-16 thomas 		if (dst == PROC_GOTWEBD)
177 8a35f56c 2022-07-16 thomas 			continue;
178 8a35f56c 2022-07-16 thomas 
179 8a35f56c 2022-07-16 thomas 		for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
180 8a35f56c 2022-07-16 thomas 			iev = &ps->ps_ievs[dst][inst];
181 8a35f56c 2022-07-16 thomas 			imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
182 8a35f56c 2022-07-16 thomas 			event_set(&iev->ev, iev->ibuf.fd, iev->events,
183 8a35f56c 2022-07-16 thomas 			    iev->handler, iev->data);
184 8a35f56c 2022-07-16 thomas 			event_add(&iev->ev, NULL);
185 8a35f56c 2022-07-16 thomas 		}
186 8a35f56c 2022-07-16 thomas 	}
187 8a35f56c 2022-07-16 thomas 
188 8a35f56c 2022-07-16 thomas 	/* Distribute the socketpair()s for everyone. */
189 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++)
190 8a35f56c 2022-07-16 thomas 		for (dst = src; dst < PROC_MAX; dst++) {
191 8a35f56c 2022-07-16 thomas 			/* Parent already distributed its fds. */
192 8a35f56c 2022-07-16 thomas 			if (src == PROC_GOTWEBD || dst == PROC_GOTWEBD)
193 8a35f56c 2022-07-16 thomas 				continue;
194 8a35f56c 2022-07-16 thomas 
195 8a35f56c 2022-07-16 thomas 			proc_open(ps, src, dst);
196 8a35f56c 2022-07-16 thomas 		}
197 8a35f56c 2022-07-16 thomas }
198 8a35f56c 2022-07-16 thomas 
199 8a35f56c 2022-07-16 thomas void
200 8a35f56c 2022-07-16 thomas proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
201 8a35f56c 2022-07-16 thomas     int argc, char **argv, enum privsep_procid proc_id)
202 8a35f56c 2022-07-16 thomas {
203 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = NULL;
204 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pa, *pb;
205 8a35f56c 2022-07-16 thomas 	unsigned int proc;
206 8a35f56c 2022-07-16 thomas 	unsigned int dst;
207 8a35f56c 2022-07-16 thomas 	int fds[2];
208 8a35f56c 2022-07-16 thomas 
209 8a35f56c 2022-07-16 thomas 	/* Don't initiate anything if we are not really going to run. */
210 8a35f56c 2022-07-16 thomas 	if (ps->ps_noaction)
211 8a35f56c 2022-07-16 thomas 		return;
212 8a35f56c 2022-07-16 thomas 
213 8a35f56c 2022-07-16 thomas 	if (proc_id == PROC_GOTWEBD) {
214 8a35f56c 2022-07-16 thomas 		privsep_process = PROC_GOTWEBD;
215 8a35f56c 2022-07-16 thomas 		proc_setup(ps, procs, nproc);
216 8a35f56c 2022-07-16 thomas 
217 8a35f56c 2022-07-16 thomas 		/*
218 b6b86fd1 2022-08-30 thomas 		 * Create the children sockets so we can use them
219 8a35f56c 2022-07-16 thomas 		 * to distribute the rest of the socketpair()s using
220 8a35f56c 2022-07-16 thomas 		 * proc_connect() later.
221 8a35f56c 2022-07-16 thomas 		 */
222 8a35f56c 2022-07-16 thomas 		for (dst = 0; dst < PROC_MAX; dst++) {
223 8a35f56c 2022-07-16 thomas 			/* Don't create socket for ourselves. */
224 8a35f56c 2022-07-16 thomas 			if (dst == PROC_GOTWEBD)
225 8a35f56c 2022-07-16 thomas 				continue;
226 8a35f56c 2022-07-16 thomas 
227 8a35f56c 2022-07-16 thomas 			for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
228 8a35f56c 2022-07-16 thomas 				pa = &ps->ps_pipes[PROC_GOTWEBD][0];
229 8a35f56c 2022-07-16 thomas 				pb = &ps->ps_pipes[dst][proc];
230 dd7a7d5b 2022-07-16 thomas 				int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
231 dd7a7d5b 2022-07-16 thomas #ifdef SOCK_CLOEXEC
232 dd7a7d5b 2022-07-16 thomas 				sock_flags |= SOCK_CLOEXEC;
233 dd7a7d5b 2022-07-16 thomas #endif
234 dd7a7d5b 2022-07-16 thomas 				if (socketpair(AF_UNIX, sock_flags,
235 8a35f56c 2022-07-16 thomas 				    PF_UNSPEC, fds) == -1)
236 8a35f56c 2022-07-16 thomas 					fatal("%s: socketpair", __func__);
237 8a35f56c 2022-07-16 thomas 
238 8a35f56c 2022-07-16 thomas 				pa->pp_pipes[dst][proc] = fds[0];
239 8a35f56c 2022-07-16 thomas 				pb->pp_pipes[PROC_GOTWEBD][0] = fds[1];
240 8a35f56c 2022-07-16 thomas 			}
241 8a35f56c 2022-07-16 thomas 		}
242 8a35f56c 2022-07-16 thomas 
243 8a35f56c 2022-07-16 thomas 		/* Engage! */
244 8a35f56c 2022-07-16 thomas 		proc_exec(ps, procs, nproc, argc, argv);
245 8a35f56c 2022-07-16 thomas 		return;
246 8a35f56c 2022-07-16 thomas 	}
247 8a35f56c 2022-07-16 thomas 
248 8a35f56c 2022-07-16 thomas 	/* Initialize a child */
249 8a35f56c 2022-07-16 thomas 	for (proc = 0; proc < nproc; proc++) {
250 8a35f56c 2022-07-16 thomas 		if (procs[proc].p_id != proc_id)
251 8a35f56c 2022-07-16 thomas 			continue;
252 8a35f56c 2022-07-16 thomas 		p = &procs[proc];
253 8a35f56c 2022-07-16 thomas 		break;
254 8a35f56c 2022-07-16 thomas 	}
255 8a35f56c 2022-07-16 thomas 	if (p == NULL || p->p_init == NULL)
256 8a35f56c 2022-07-16 thomas 		fatalx("%s: process %d missing process initialization",
257 8a35f56c 2022-07-16 thomas 		    __func__, proc_id);
258 8a35f56c 2022-07-16 thomas 
259 8a35f56c 2022-07-16 thomas 	p->p_init(ps, p);
260 8a35f56c 2022-07-16 thomas 
261 8a35f56c 2022-07-16 thomas 	fatalx("failed to initiate child process");
262 8a35f56c 2022-07-16 thomas }
263 8a35f56c 2022-07-16 thomas 
264 8a35f56c 2022-07-16 thomas void
265 8a35f56c 2022-07-16 thomas proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
266 8a35f56c 2022-07-16 thomas     unsigned int n)
267 8a35f56c 2022-07-16 thomas {
268 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp = ps->ps_pp;
269 8a35f56c 2022-07-16 thomas 	struct imsgev *iev;
270 8a35f56c 2022-07-16 thomas 
271 8a35f56c 2022-07-16 thomas 	if (ps->ps_ievs[dst] == NULL) {
272 8a35f56c 2022-07-16 thomas #if DEBUG > 1
273 8a35f56c 2022-07-16 thomas 		log_debug("%s: %s src %d %d to dst %d %d not connected",
274 8a35f56c 2022-07-16 thomas 		    __func__, ps->ps_title[privsep_process],
275 8a35f56c 2022-07-16 thomas 		    privsep_process, ps->ps_instance + 1,
276 8a35f56c 2022-07-16 thomas 		    dst, n + 1);
277 8a35f56c 2022-07-16 thomas #endif
278 8a35f56c 2022-07-16 thomas 		close(fd);
279 8a35f56c 2022-07-16 thomas 		return;
280 8a35f56c 2022-07-16 thomas 	}
281 8a35f56c 2022-07-16 thomas 
282 8a35f56c 2022-07-16 thomas 	if (pp->pp_pipes[dst][n] != -1) {
283 8a35f56c 2022-07-16 thomas 		log_warnx("%s: duplicated descriptor", __func__);
284 8a35f56c 2022-07-16 thomas 		close(fd);
285 8a35f56c 2022-07-16 thomas 		return;
286 8a35f56c 2022-07-16 thomas 	} else
287 8a35f56c 2022-07-16 thomas 		pp->pp_pipes[dst][n] = fd;
288 8a35f56c 2022-07-16 thomas 
289 8a35f56c 2022-07-16 thomas 	iev = &ps->ps_ievs[dst][n];
290 8a35f56c 2022-07-16 thomas 	imsg_init(&iev->ibuf, fd);
291 8a35f56c 2022-07-16 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
292 8a35f56c 2022-07-16 thomas 	event_add(&iev->ev, NULL);
293 8a35f56c 2022-07-16 thomas }
294 8a35f56c 2022-07-16 thomas 
295 8a35f56c 2022-07-16 thomas void
296 8a35f56c 2022-07-16 thomas proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
297 8a35f56c 2022-07-16 thomas {
298 8a35f56c 2022-07-16 thomas 	unsigned int i, j, src, dst, id;
299 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp;
300 8a35f56c 2022-07-16 thomas 
301 8a35f56c 2022-07-16 thomas 	/* Initialize parent title, ps_instances and procs. */
302 8a35f56c 2022-07-16 thomas 	ps->ps_title[PROC_GOTWEBD] = "parent";
303 8a35f56c 2022-07-16 thomas 
304 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++)
305 8a35f56c 2022-07-16 thomas 		/* Default to 1 process instance */
306 8a35f56c 2022-07-16 thomas 		if (ps->ps_instances[src] < 1)
307 8a35f56c 2022-07-16 thomas 			ps->ps_instances[src] = 1;
308 8a35f56c 2022-07-16 thomas 
309 8a35f56c 2022-07-16 thomas 	for (src = 0; src < nproc; src++) {
310 8a35f56c 2022-07-16 thomas 		procs[src].p_ps = ps;
311 8a35f56c 2022-07-16 thomas 		if (procs[src].p_cb == NULL)
312 8a35f56c 2022-07-16 thomas 			procs[src].p_cb = proc_dispatch_null;
313 8a35f56c 2022-07-16 thomas 
314 8a35f56c 2022-07-16 thomas 		id = procs[src].p_id;
315 8a35f56c 2022-07-16 thomas 		ps->ps_title[id] = procs[src].p_title;
316 8a35f56c 2022-07-16 thomas 		ps->ps_ievs[id] = calloc(ps->ps_instances[id],
317 8a35f56c 2022-07-16 thomas 		    sizeof(struct imsgev));
318 8a35f56c 2022-07-16 thomas 		if (ps->ps_ievs[id] == NULL)
319 8a35f56c 2022-07-16 thomas 			fatal("%s: calloc", __func__);
320 8a35f56c 2022-07-16 thomas 
321 8a35f56c 2022-07-16 thomas 		/* With this set up, we are ready to call imsg_init(). */
322 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[id]; i++) {
323 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].handler = proc_dispatch;
324 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].events = EV_READ;
325 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].proc = &procs[src];
326 8a35f56c 2022-07-16 thomas 			ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
327 8a35f56c 2022-07-16 thomas 		}
328 8a35f56c 2022-07-16 thomas 	}
329 8a35f56c 2022-07-16 thomas 
330 8a35f56c 2022-07-16 thomas 	/*
331 8a35f56c 2022-07-16 thomas 	 * Allocate pipes for all process instances (incl. parent)
332 8a35f56c 2022-07-16 thomas 	 *
333 8a35f56c 2022-07-16 thomas 	 * - ps->ps_pipes: N:M mapping
334 8a35f56c 2022-07-16 thomas 	 * N source processes connected to M destination processes:
335 8a35f56c 2022-07-16 thomas 	 * [src][instances][dst][instances], for example
336 8a35f56c 2022-07-16 thomas 	 * [PROC_RELAY][3][PROC_CA][3]
337 8a35f56c 2022-07-16 thomas 	 *
338 8a35f56c 2022-07-16 thomas 	 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
339 8a35f56c 2022-07-16 thomas 	 * Each process instance has a destination array of socketpair fds:
340 8a35f56c 2022-07-16 thomas 	 * [dst][instances], for example
341 8a35f56c 2022-07-16 thomas 	 * [PROC_GOTWEBD][0]
342 8a35f56c 2022-07-16 thomas 	 */
343 8a35f56c 2022-07-16 thomas 	for (src = 0; src < PROC_MAX; src++) {
344 8a35f56c 2022-07-16 thomas 		/* Allocate destination array for each process */
345 8a35f56c 2022-07-16 thomas 		ps->ps_pipes[src] = calloc(ps->ps_instances[src],
346 8a35f56c 2022-07-16 thomas 		    sizeof(struct privsep_pipes));
347 8a35f56c 2022-07-16 thomas 		if (ps->ps_pipes[src] == NULL)
348 8a35f56c 2022-07-16 thomas 			fatal("%s: calloc", __func__);
349 8a35f56c 2022-07-16 thomas 
350 8a35f56c 2022-07-16 thomas 		for (i = 0; i < ps->ps_instances[src]; i++) {
351 8a35f56c 2022-07-16 thomas 			pp = &ps->ps_pipes[src][i];
352 8a35f56c 2022-07-16 thomas 
353 8a35f56c 2022-07-16 thomas 			for (dst = 0; dst < PROC_MAX; dst++) {
354 8a35f56c 2022-07-16 thomas 				/* Allocate maximum fd integers */
355 8a35f56c 2022-07-16 thomas 				pp->pp_pipes[dst] =
356 8a35f56c 2022-07-16 thomas 				    calloc(ps->ps_instances[dst],
357 8a35f56c 2022-07-16 thomas 				    sizeof(int));
358 8a35f56c 2022-07-16 thomas 				if (pp->pp_pipes[dst] == NULL)
359 8a35f56c 2022-07-16 thomas 					fatal("%s: calloc", __func__);
360 8a35f56c 2022-07-16 thomas 
361 8a35f56c 2022-07-16 thomas 				/* Mark fd as unused */
362 8a35f56c 2022-07-16 thomas 				for (j = 0; j < ps->ps_instances[dst]; j++)
363 8a35f56c 2022-07-16 thomas 					pp->pp_pipes[dst][j] = -1;
364 8a35f56c 2022-07-16 thomas 			}
365 8a35f56c 2022-07-16 thomas 		}
366 8a35f56c 2022-07-16 thomas 	}
367 8a35f56c 2022-07-16 thomas 
368 8a35f56c 2022-07-16 thomas 	ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
369 8a35f56c 2022-07-16 thomas }
370 8a35f56c 2022-07-16 thomas 
371 8a35f56c 2022-07-16 thomas void
372 8a35f56c 2022-07-16 thomas proc_kill(struct privsep *ps)
373 8a35f56c 2022-07-16 thomas {
374 8a35f56c 2022-07-16 thomas 	char *cause;
375 8a35f56c 2022-07-16 thomas 	pid_t pid;
376 8a35f56c 2022-07-16 thomas 	int len, status;
377 8a35f56c 2022-07-16 thomas 
378 8a35f56c 2022-07-16 thomas 	if (privsep_process != PROC_GOTWEBD)
379 8a35f56c 2022-07-16 thomas 		return;
380 8a35f56c 2022-07-16 thomas 
381 8a35f56c 2022-07-16 thomas 	proc_close(ps);
382 8a35f56c 2022-07-16 thomas 
383 8a35f56c 2022-07-16 thomas 	do {
384 8a35f56c 2022-07-16 thomas 		pid = waitpid(WAIT_ANY, &status, 0);
385 8a35f56c 2022-07-16 thomas 		if (pid <= 0)
386 8a35f56c 2022-07-16 thomas 			continue;
387 8a35f56c 2022-07-16 thomas 
388 8a35f56c 2022-07-16 thomas 		if (WIFSIGNALED(status)) {
389 8a35f56c 2022-07-16 thomas 			len = asprintf(&cause, "terminated; signal %d",
390 8a35f56c 2022-07-16 thomas 			    WTERMSIG(status));
391 8a35f56c 2022-07-16 thomas 		} else if (WIFEXITED(status)) {
392 8a35f56c 2022-07-16 thomas 			if (WEXITSTATUS(status) != 0)
393 8a35f56c 2022-07-16 thomas 				len = asprintf(&cause, "exited abnormally");
394 8a35f56c 2022-07-16 thomas 			else
395 8a35f56c 2022-07-16 thomas 				len = 0;
396 8a35f56c 2022-07-16 thomas 		} else
397 8a35f56c 2022-07-16 thomas 			len = -1;
398 8a35f56c 2022-07-16 thomas 
399 8a35f56c 2022-07-16 thomas 		if (len == 0) {
400 8a35f56c 2022-07-16 thomas 			/* child exited OK, don't print a warning message */
401 8a35f56c 2022-07-16 thomas 		} else if (len != -1) {
402 8a35f56c 2022-07-16 thomas 			log_warnx("lost child: pid %u %s", pid, cause);
403 8a35f56c 2022-07-16 thomas 			free(cause);
404 8a35f56c 2022-07-16 thomas 		} else
405 8a35f56c 2022-07-16 thomas 			log_warnx("lost child: pid %u", pid);
406 8a35f56c 2022-07-16 thomas 	} while (pid != -1 || (pid == -1 && errno == EINTR));
407 8a35f56c 2022-07-16 thomas }
408 8a35f56c 2022-07-16 thomas 
409 8a35f56c 2022-07-16 thomas void
410 8a35f56c 2022-07-16 thomas proc_open(struct privsep *ps, int src, int dst)
411 8a35f56c 2022-07-16 thomas {
412 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pa, *pb;
413 8a35f56c 2022-07-16 thomas 	struct privsep_fd pf;
414 8a35f56c 2022-07-16 thomas 	int fds[2];
415 8a35f56c 2022-07-16 thomas 	unsigned int i, j;
416 8a35f56c 2022-07-16 thomas 
417 8a35f56c 2022-07-16 thomas 	/* Exchange pipes between process. */
418 8a35f56c 2022-07-16 thomas 	for (i = 0; i < ps->ps_instances[src]; i++) {
419 8a35f56c 2022-07-16 thomas 		for (j = 0; j < ps->ps_instances[dst]; j++) {
420 8a35f56c 2022-07-16 thomas 			/* Don't create sockets for ourself. */
421 8a35f56c 2022-07-16 thomas 			if (src == dst && i == j)
422 8a35f56c 2022-07-16 thomas 				continue;
423 8a35f56c 2022-07-16 thomas 
424 8a35f56c 2022-07-16 thomas 			pa = &ps->ps_pipes[src][i];
425 8a35f56c 2022-07-16 thomas 			pb = &ps->ps_pipes[dst][j];
426 dd7a7d5b 2022-07-16 thomas 			int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
427 dd7a7d5b 2022-07-16 thomas #ifdef SOCK_CLOEXEC
428 dd7a7d5b 2022-07-16 thomas 			sock_flags |= SOCK_CLOEXEC;
429 dd7a7d5b 2022-07-16 thomas #endif
430 dd7a7d5b 2022-07-16 thomas 			if (socketpair(AF_UNIX, sock_flags,
431 8a35f56c 2022-07-16 thomas 			    PF_UNSPEC, fds) == -1)
432 8a35f56c 2022-07-16 thomas 				fatal("%s: socketpair", __func__);
433 8a35f56c 2022-07-16 thomas 
434 8a35f56c 2022-07-16 thomas 			pa->pp_pipes[dst][j] = fds[0];
435 8a35f56c 2022-07-16 thomas 			pb->pp_pipes[src][i] = fds[1];
436 8a35f56c 2022-07-16 thomas 
437 8a35f56c 2022-07-16 thomas 			pf.pf_procid = src;
438 8a35f56c 2022-07-16 thomas 			pf.pf_instance = i;
439 8a35f56c 2022-07-16 thomas 			if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
440 8a35f56c 2022-07-16 thomas 			    -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
441 8a35f56c 2022-07-16 thomas 				fatal("%s: proc_compose_imsg", __func__);
442 8a35f56c 2022-07-16 thomas 
443 8a35f56c 2022-07-16 thomas 			pf.pf_procid = dst;
444 8a35f56c 2022-07-16 thomas 			pf.pf_instance = j;
445 8a35f56c 2022-07-16 thomas 			if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
446 8a35f56c 2022-07-16 thomas 			    -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
447 8a35f56c 2022-07-16 thomas 				fatal("%s: proc_compose_imsg", __func__);
448 8a35f56c 2022-07-16 thomas 
449 8a35f56c 2022-07-16 thomas 			/*
450 8a35f56c 2022-07-16 thomas 			 * We have to flush to send the descriptors and close
451 8a35f56c 2022-07-16 thomas 			 * them to avoid the fd ramp on startup.
452 8a35f56c 2022-07-16 thomas 			 */
453 8a35f56c 2022-07-16 thomas 			if (proc_flush_imsg(ps, src, i) == -1 ||
454 8a35f56c 2022-07-16 thomas 			    proc_flush_imsg(ps, dst, j) == -1)
455 8a35f56c 2022-07-16 thomas 				fatal("%s: imsg_flush", __func__);
456 8a35f56c 2022-07-16 thomas 		}
457 8a35f56c 2022-07-16 thomas 	}
458 8a35f56c 2022-07-16 thomas }
459 8a35f56c 2022-07-16 thomas 
460 8a35f56c 2022-07-16 thomas void
461 8a35f56c 2022-07-16 thomas proc_close(struct privsep *ps)
462 8a35f56c 2022-07-16 thomas {
463 8a35f56c 2022-07-16 thomas 	unsigned int dst, n;
464 8a35f56c 2022-07-16 thomas 	struct privsep_pipes *pp;
465 8a35f56c 2022-07-16 thomas 
466 8a35f56c 2022-07-16 thomas 	if (ps == NULL)
467 8a35f56c 2022-07-16 thomas 		return;
468 8a35f56c 2022-07-16 thomas 
469 8a35f56c 2022-07-16 thomas 	pp = ps->ps_pp;
470 8a35f56c 2022-07-16 thomas 
471 8a35f56c 2022-07-16 thomas 	for (dst = 0; dst < PROC_MAX; dst++) {
472 8a35f56c 2022-07-16 thomas 		if (ps->ps_ievs[dst] == NULL)
473 8a35f56c 2022-07-16 thomas 			continue;
474 8a35f56c 2022-07-16 thomas 
475 8a35f56c 2022-07-16 thomas 		for (n = 0; n < ps->ps_instances[dst]; n++) {
476 8a35f56c 2022-07-16 thomas 			if (pp->pp_pipes[dst][n] == -1)
477 8a35f56c 2022-07-16 thomas 				continue;
478 8a35f56c 2022-07-16 thomas 
479 8a35f56c 2022-07-16 thomas 			/* Cancel the fd, close and invalidate the fd */
480 8a35f56c 2022-07-16 thomas 			event_del(&(ps->ps_ievs[dst][n].ev));
481 8a35f56c 2022-07-16 thomas 			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
482 8a35f56c 2022-07-16 thomas 			close(pp->pp_pipes[dst][n]);
483 8a35f56c 2022-07-16 thomas 			pp->pp_pipes[dst][n] = -1;
484 8a35f56c 2022-07-16 thomas 		}
485 8a35f56c 2022-07-16 thomas 		free(ps->ps_ievs[dst]);
486 8a35f56c 2022-07-16 thomas 	}
487 8a35f56c 2022-07-16 thomas }
488 8a35f56c 2022-07-16 thomas 
489 8a35f56c 2022-07-16 thomas void
490 8a35f56c 2022-07-16 thomas proc_shutdown(struct privsep_proc *p)
491 8a35f56c 2022-07-16 thomas {
492 8a35f56c 2022-07-16 thomas 	struct privsep *ps = p->p_ps;
493 8a35f56c 2022-07-16 thomas 
494 8a35f56c 2022-07-16 thomas 	if (p->p_shutdown != NULL)
495 8a35f56c 2022-07-16 thomas 		(*p->p_shutdown)();
496 8a35f56c 2022-07-16 thomas 
497 8a35f56c 2022-07-16 thomas 	proc_close(ps);
498 8a35f56c 2022-07-16 thomas 
499 8a35f56c 2022-07-16 thomas 	log_info("%s, %s exiting, pid %d", getprogname(), p->p_title, getpid());
500 8a35f56c 2022-07-16 thomas 
501 8a35f56c 2022-07-16 thomas 	exit(0);
502 8a35f56c 2022-07-16 thomas }
503 8a35f56c 2022-07-16 thomas 
504 8a35f56c 2022-07-16 thomas void
505 8a35f56c 2022-07-16 thomas proc_sig_handler(int sig, short event, void *arg)
506 8a35f56c 2022-07-16 thomas {
507 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = arg;
508 8a35f56c 2022-07-16 thomas 
509 8a35f56c 2022-07-16 thomas 	switch (sig) {
510 8a35f56c 2022-07-16 thomas 	case SIGINT:
511 8a35f56c 2022-07-16 thomas 	case SIGTERM:
512 8a35f56c 2022-07-16 thomas 		proc_shutdown(p);
513 8a35f56c 2022-07-16 thomas 		break;
514 8a35f56c 2022-07-16 thomas 	case SIGCHLD:
515 8a35f56c 2022-07-16 thomas 	case SIGHUP:
516 8a35f56c 2022-07-16 thomas 	case SIGPIPE:
517 8a35f56c 2022-07-16 thomas 	case SIGUSR1:
518 8a35f56c 2022-07-16 thomas 		/* ignore */
519 8a35f56c 2022-07-16 thomas 		break;
520 8a35f56c 2022-07-16 thomas 	default:
521 8a35f56c 2022-07-16 thomas 		fatalx("proc_sig_handler: unexpected signal");
522 8a35f56c 2022-07-16 thomas 		/* NOTREACHED */
523 8a35f56c 2022-07-16 thomas 	}
524 8a35f56c 2022-07-16 thomas }
525 8a35f56c 2022-07-16 thomas 
526 8a35f56c 2022-07-16 thomas void
527 8a35f56c 2022-07-16 thomas proc_run(struct privsep *ps, struct privsep_proc *p,
528 8a35f56c 2022-07-16 thomas     struct privsep_proc *procs, unsigned int nproc,
529 8a35f56c 2022-07-16 thomas     void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
530 8a35f56c 2022-07-16 thomas {
531 8a35f56c 2022-07-16 thomas 	struct passwd *pw;
532 8a35f56c 2022-07-16 thomas 	const char *root;
533 8a35f56c 2022-07-16 thomas 
534 8a35f56c 2022-07-16 thomas 	log_procinit(p->p_title);
535 8a35f56c 2022-07-16 thomas 
536 8a35f56c 2022-07-16 thomas 	/* Set the process group of the current process */
537 8a35f56c 2022-07-16 thomas 	setpgid(0, 0);
538 8a35f56c 2022-07-16 thomas 
539 8a35f56c 2022-07-16 thomas 	/* Use non-standard user */
540 8a35f56c 2022-07-16 thomas 	if (p->p_pw != NULL)
541 8a35f56c 2022-07-16 thomas 		pw = p->p_pw;
542 8a35f56c 2022-07-16 thomas 	else
543 8a35f56c 2022-07-16 thomas 		pw = ps->ps_pw;
544 8a35f56c 2022-07-16 thomas 
545 8a35f56c 2022-07-16 thomas 	/* Change root directory */
546 8a35f56c 2022-07-16 thomas 	if (p->p_chroot != NULL)
547 8a35f56c 2022-07-16 thomas 		root = p->p_chroot;
548 8a35f56c 2022-07-16 thomas 	else
549 8a35f56c 2022-07-16 thomas 		root = pw->pw_dir;
550 8a35f56c 2022-07-16 thomas 
551 8a35f56c 2022-07-16 thomas 	if (chroot(root) == -1)
552 8a35f56c 2022-07-16 thomas 		fatal("proc_run: chroot");
553 8a35f56c 2022-07-16 thomas 	if (chdir("/") == -1)
554 8a35f56c 2022-07-16 thomas 		fatal("proc_run: chdir(\"/\")");
555 8a35f56c 2022-07-16 thomas 
556 8a35f56c 2022-07-16 thomas 	privsep_process = p->p_id;
557 8a35f56c 2022-07-16 thomas 
558 8a35f56c 2022-07-16 thomas 	setproctitle("%s", p->p_title);
559 8a35f56c 2022-07-16 thomas 
560 8a35f56c 2022-07-16 thomas 	if (setgroups(1, &pw->pw_gid) ||
561 8a35f56c 2022-07-16 thomas 	    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
562 8a35f56c 2022-07-16 thomas 	    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
563 8a35f56c 2022-07-16 thomas 		fatal("proc_run: cannot drop privileges");
564 8a35f56c 2022-07-16 thomas 
565 8a35f56c 2022-07-16 thomas 	event_init();
566 8a35f56c 2022-07-16 thomas 
567 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
568 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
569 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
570 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
571 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
572 8a35f56c 2022-07-16 thomas 	signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
573 8a35f56c 2022-07-16 thomas 
574 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigint, NULL);
575 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigterm, NULL);
576 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigchld, NULL);
577 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsighup, NULL);
578 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigpipe, NULL);
579 8a35f56c 2022-07-16 thomas 	signal_add(&ps->ps_evsigusr1, NULL);
580 8a35f56c 2022-07-16 thomas 
581 8a35f56c 2022-07-16 thomas 	proc_setup(ps, procs, nproc);
582 8a35f56c 2022-07-16 thomas 	proc_accept(ps, PROC_GOTWEBD_SOCK_FILENO, PROC_GOTWEBD, 0);
583 8a35f56c 2022-07-16 thomas 
584 8a35f56c 2022-07-16 thomas 	DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title,
585 8a35f56c 2022-07-16 thomas 	    ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
586 8a35f56c 2022-07-16 thomas 
587 8a35f56c 2022-07-16 thomas 	if (run != NULL)
588 8a35f56c 2022-07-16 thomas 		run(ps, p, arg);
589 8a35f56c 2022-07-16 thomas 
590 8a35f56c 2022-07-16 thomas 	event_dispatch();
591 8a35f56c 2022-07-16 thomas 
592 8a35f56c 2022-07-16 thomas 	proc_shutdown(p);
593 8a35f56c 2022-07-16 thomas }
594 8a35f56c 2022-07-16 thomas 
595 8a35f56c 2022-07-16 thomas void
596 8a35f56c 2022-07-16 thomas proc_dispatch(int fd, short event, void *arg)
597 8a35f56c 2022-07-16 thomas {
598 8a35f56c 2022-07-16 thomas 	struct imsgev *iev = arg;
599 8a35f56c 2022-07-16 thomas 	struct privsep_proc *p = iev->proc;
600 8a35f56c 2022-07-16 thomas 	struct privsep *ps = p->p_ps;
601 8a35f56c 2022-07-16 thomas 	struct imsgbuf *ibuf;
602 8a35f56c 2022-07-16 thomas 	struct imsg imsg;
603 8a35f56c 2022-07-16 thomas 	ssize_t n;
604 8a35f56c 2022-07-16 thomas 	int verbose;
605 8a35f56c 2022-07-16 thomas 	const char *title;
606 8a35f56c 2022-07-16 thomas 	struct privsep_fd pf;
607 8a35f56c 2022-07-16 thomas 
608 8a35f56c 2022-07-16 thomas 	title = ps->ps_title[privsep_process];
609 8a35f56c 2022-07-16 thomas 	ibuf = &iev->ibuf;
610 8a35f56c 2022-07-16 thomas 
611 8a35f56c 2022-07-16 thomas 	if (event & EV_READ) {
612 8a35f56c 2022-07-16 thomas 		n = imsg_read(ibuf);
613 8a35f56c 2022-07-16 thomas 		if (n == -1 && errno != EAGAIN)
614 8a35f56c 2022-07-16 thomas 			fatal("%s: imsg_read", __func__);
615 8a35f56c 2022-07-16 thomas 		if (n == 0) {
616 8a35f56c 2022-07-16 thomas 			/* this pipe is dead, so remove the event handler */
617 8a35f56c 2022-07-16 thomas 			event_del(&iev->ev);
618 8a35f56c 2022-07-16 thomas 			event_loopexit(NULL);
619 8a35f56c 2022-07-16 thomas 			return;
620 8a35f56c 2022-07-16 thomas 		}
621 8a35f56c 2022-07-16 thomas 	}
622 8a35f56c 2022-07-16 thomas 
623 8a35f56c 2022-07-16 thomas 	if (event & EV_WRITE) {
624 8a35f56c 2022-07-16 thomas 		n = msgbuf_write(&ibuf->w);
625 8a35f56c 2022-07-16 thomas 		if (n == -1 && errno != EAGAIN)
626 8a35f56c 2022-07-16 thomas 			fatal("%s: msgbuf_write", __func__);
627 8a35f56c 2022-07-16 thomas 		if (n == 0) {
628 8a35f56c 2022-07-16 thomas 			/* this pipe is dead, so remove the event handler */
629 8a35f56c 2022-07-16 thomas 			event_del(&iev->ev);
630 8a35f56c 2022-07-16 thomas 			event_loopexit(NULL);
631 8a35f56c 2022-07-16 thomas 			return;
632 8a35f56c 2022-07-16 thomas 		}
633 8a35f56c 2022-07-16 thomas 	}
634 8a35f56c 2022-07-16 thomas 
635 8a35f56c 2022-07-16 thomas 	for (;;) {
636 8a35f56c 2022-07-16 thomas 		n = imsg_get(ibuf, &imsg);
637 8a35f56c 2022-07-16 thomas 		if (n == -1)
638 8a35f56c 2022-07-16 thomas 			fatal("%s: imsg_get", __func__);
639 8a35f56c 2022-07-16 thomas 		if (n == 0)
640 8a35f56c 2022-07-16 thomas 			break;
641 8a35f56c 2022-07-16 thomas 
642 8a35f56c 2022-07-16 thomas #if DEBUG > 1
643 8a35f56c 2022-07-16 thomas 		log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
644 8a35f56c 2022-07-16 thomas 		    __func__, title, ps->ps_instance + 1,
645 8a35f56c 2022-07-16 thomas 		    imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
646 8a35f56c 2022-07-16 thomas #endif
647 8a35f56c 2022-07-16 thomas 
648 8a35f56c 2022-07-16 thomas 		/*
649 8a35f56c 2022-07-16 thomas 		 * Check the message with the program callback
650 8a35f56c 2022-07-16 thomas 		 */
651 8a35f56c 2022-07-16 thomas 		if ((p->p_cb)(fd, p, &imsg) == 0) {
652 8a35f56c 2022-07-16 thomas 			/* Message was handled by the callback, continue */
653 8a35f56c 2022-07-16 thomas 			imsg_free(&imsg);
654 8a35f56c 2022-07-16 thomas 			continue;
655 8a35f56c 2022-07-16 thomas 		}
656 8a35f56c 2022-07-16 thomas 
657 8a35f56c 2022-07-16 thomas 		/*
658 8a35f56c 2022-07-16 thomas 		 * Generic message handling
659 8a35f56c 2022-07-16 thomas 		 */
660 8a35f56c 2022-07-16 thomas 		switch (imsg.hdr.type) {
661 8a35f56c 2022-07-16 thomas 		case IMSG_CTL_VERBOSE:
662 8a35f56c 2022-07-16 thomas 			log_info("%s", __func__);
663 8a35f56c 2022-07-16 thomas 			IMSG_SIZE_CHECK(&imsg, &verbose);
664 8a35f56c 2022-07-16 thomas 			memcpy(&verbose, imsg.data, sizeof(verbose));
665 8a35f56c 2022-07-16 thomas 			log_setverbose(verbose);
666 8a35f56c 2022-07-16 thomas 			break;
667 8a35f56c 2022-07-16 thomas 		case IMSG_CTL_PROCFD:
668 8a35f56c 2022-07-16 thomas 			IMSG_SIZE_CHECK(&imsg, &pf);
669 8a35f56c 2022-07-16 thomas 			memcpy(&pf, imsg.data, sizeof(pf));
670 8a35f56c 2022-07-16 thomas 			proc_accept(ps, imsg.fd, pf.pf_procid,
671 8a35f56c 2022-07-16 thomas 			    pf.pf_instance);
672 8a35f56c 2022-07-16 thomas 			break;
673 8a35f56c 2022-07-16 thomas 		default:
674 8a35f56c 2022-07-16 thomas 			log_warnx("%s: %s %d got invalid imsg %d peerid %d "
675 8a35f56c 2022-07-16 thomas 			    "from %s %d",
676 8a35f56c 2022-07-16 thomas 			    __func__, title, ps->ps_instance + 1,
677 8a35f56c 2022-07-16 thomas 			    imsg.hdr.type, imsg.hdr.peerid,
678 8a35f56c 2022-07-16 thomas 			    p->p_title, imsg.hdr.pid);
679 8a35f56c 2022-07-16 thomas 		}
680 8a35f56c 2022-07-16 thomas 		imsg_free(&imsg);
681 8a35f56c 2022-07-16 thomas 	}
682 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
683 8a35f56c 2022-07-16 thomas }
684 8a35f56c 2022-07-16 thomas 
685 8a35f56c 2022-07-16 thomas int
686 8a35f56c 2022-07-16 thomas proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
687 8a35f56c 2022-07-16 thomas {
688 8a35f56c 2022-07-16 thomas 	return (-1);
689 8a35f56c 2022-07-16 thomas }
690 8a35f56c 2022-07-16 thomas 
691 8a35f56c 2022-07-16 thomas /*
692 8a35f56c 2022-07-16 thomas  * imsg helper functions
693 8a35f56c 2022-07-16 thomas  */
694 8a35f56c 2022-07-16 thomas 
695 8a35f56c 2022-07-16 thomas void
696 8a35f56c 2022-07-16 thomas imsg_event_add(struct imsgev *iev)
697 8a35f56c 2022-07-16 thomas {
698 8a35f56c 2022-07-16 thomas 	if (iev->handler == NULL) {
699 8a35f56c 2022-07-16 thomas 		imsg_flush(&iev->ibuf);
700 8a35f56c 2022-07-16 thomas 		return;
701 8a35f56c 2022-07-16 thomas 	}
702 8a35f56c 2022-07-16 thomas 
703 8a35f56c 2022-07-16 thomas 	iev->events = EV_READ;
704 8a35f56c 2022-07-16 thomas 	if (iev->ibuf.w.queued)
705 8a35f56c 2022-07-16 thomas 		iev->events |= EV_WRITE;
706 8a35f56c 2022-07-16 thomas 
707 8a35f56c 2022-07-16 thomas 	event_del(&iev->ev);
708 8a35f56c 2022-07-16 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
709 8a35f56c 2022-07-16 thomas 	event_add(&iev->ev, NULL);
710 8a35f56c 2022-07-16 thomas }
711 8a35f56c 2022-07-16 thomas 
712 8a35f56c 2022-07-16 thomas int
713 8a35f56c 2022-07-16 thomas imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
714 8a35f56c 2022-07-16 thomas     pid_t pid, int fd, void *data, uint16_t datalen)
715 8a35f56c 2022-07-16 thomas {
716 8a35f56c 2022-07-16 thomas 	int ret;
717 8a35f56c 2022-07-16 thomas 
718 8a35f56c 2022-07-16 thomas 	ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen);
719 8a35f56c 2022-07-16 thomas 	if (ret == -1)
720 8a35f56c 2022-07-16 thomas 		return (ret);
721 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
722 8a35f56c 2022-07-16 thomas 	return (ret);
723 8a35f56c 2022-07-16 thomas }
724 8a35f56c 2022-07-16 thomas 
725 8a35f56c 2022-07-16 thomas int
726 8a35f56c 2022-07-16 thomas imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
727 8a35f56c 2022-07-16 thomas     pid_t pid, int fd, const struct iovec *iov, int iovcnt)
728 8a35f56c 2022-07-16 thomas {
729 8a35f56c 2022-07-16 thomas 	int ret;
730 8a35f56c 2022-07-16 thomas 
731 8a35f56c 2022-07-16 thomas 	ret = imsg_composev(&iev->ibuf, type, peerid, pid, fd, iov, iovcnt);
732 8a35f56c 2022-07-16 thomas 	if (ret == -1)
733 8a35f56c 2022-07-16 thomas 		return (ret);
734 8a35f56c 2022-07-16 thomas 	imsg_event_add(iev);
735 8a35f56c 2022-07-16 thomas 	return (ret);
736 8a35f56c 2022-07-16 thomas }
737 8a35f56c 2022-07-16 thomas 
738 8a35f56c 2022-07-16 thomas void
739 8a35f56c 2022-07-16 thomas proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
740 8a35f56c 2022-07-16 thomas {
741 8a35f56c 2022-07-16 thomas 	if (*n == -1) {
742 8a35f56c 2022-07-16 thomas 		/* Use a range of all target instances */
743 8a35f56c 2022-07-16 thomas 		*n = 0;
744 8a35f56c 2022-07-16 thomas 		*m = ps->ps_instances[id];
745 8a35f56c 2022-07-16 thomas 	} else {
746 8a35f56c 2022-07-16 thomas 		/* Use only a single slot of the specified peer process */
747 8a35f56c 2022-07-16 thomas 		*m = *n + 1;
748 8a35f56c 2022-07-16 thomas 	}
749 8a35f56c 2022-07-16 thomas }
750 8a35f56c 2022-07-16 thomas 
751 8a35f56c 2022-07-16 thomas int
752 8a35f56c 2022-07-16 thomas proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
753 8a35f56c 2022-07-16 thomas     uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
754 8a35f56c 2022-07-16 thomas {
755 8a35f56c 2022-07-16 thomas 	int m;
756 8a35f56c 2022-07-16 thomas 
757 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
758 8a35f56c 2022-07-16 thomas 	for (; n < m; n++) {
759 8a35f56c 2022-07-16 thomas 		if (imsg_compose_event(&ps->ps_ievs[id][n],
760 8a35f56c 2022-07-16 thomas 		    type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
761 8a35f56c 2022-07-16 thomas 			return (-1);
762 8a35f56c 2022-07-16 thomas 	}
763 8a35f56c 2022-07-16 thomas 
764 8a35f56c 2022-07-16 thomas 	return (0);
765 8a35f56c 2022-07-16 thomas }
766 8a35f56c 2022-07-16 thomas 
767 8a35f56c 2022-07-16 thomas int
768 8a35f56c 2022-07-16 thomas proc_compose(struct privsep *ps, enum privsep_procid id,
769 8a35f56c 2022-07-16 thomas     uint16_t type, void *data, uint16_t datalen)
770 8a35f56c 2022-07-16 thomas {
771 8a35f56c 2022-07-16 thomas 	return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
772 8a35f56c 2022-07-16 thomas }
773 8a35f56c 2022-07-16 thomas 
774 8a35f56c 2022-07-16 thomas int
775 8a35f56c 2022-07-16 thomas proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
776 8a35f56c 2022-07-16 thomas     uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
777 8a35f56c 2022-07-16 thomas {
778 8a35f56c 2022-07-16 thomas 	int m;
779 8a35f56c 2022-07-16 thomas 
780 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
781 8a35f56c 2022-07-16 thomas 	for (; n < m; n++)
782 8a35f56c 2022-07-16 thomas 		if (imsg_composev_event(&ps->ps_ievs[id][n],
783 8a35f56c 2022-07-16 thomas 		    type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
784 8a35f56c 2022-07-16 thomas 			return (-1);
785 8a35f56c 2022-07-16 thomas 
786 8a35f56c 2022-07-16 thomas 	return (0);
787 8a35f56c 2022-07-16 thomas }
788 8a35f56c 2022-07-16 thomas 
789 8a35f56c 2022-07-16 thomas int
790 8a35f56c 2022-07-16 thomas proc_composev(struct privsep *ps, enum privsep_procid id,
791 8a35f56c 2022-07-16 thomas     uint16_t type, const struct iovec *iov, int iovcnt)
792 8a35f56c 2022-07-16 thomas {
793 8a35f56c 2022-07-16 thomas 	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
794 8a35f56c 2022-07-16 thomas }
795 8a35f56c 2022-07-16 thomas 
796 8a35f56c 2022-07-16 thomas int
797 8a35f56c 2022-07-16 thomas proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
798 8a35f56c 2022-07-16 thomas     enum privsep_procid id, int n)
799 8a35f56c 2022-07-16 thomas {
800 8a35f56c 2022-07-16 thomas 	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
801 8a35f56c 2022-07-16 thomas 	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
802 8a35f56c 2022-07-16 thomas }
803 8a35f56c 2022-07-16 thomas 
804 8a35f56c 2022-07-16 thomas struct imsgbuf *
805 8a35f56c 2022-07-16 thomas proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
806 8a35f56c 2022-07-16 thomas {
807 8a35f56c 2022-07-16 thomas 	int m;
808 8a35f56c 2022-07-16 thomas 
809 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
810 8a35f56c 2022-07-16 thomas 	return (&ps->ps_ievs[id][n].ibuf);
811 8a35f56c 2022-07-16 thomas }
812 8a35f56c 2022-07-16 thomas 
813 8a35f56c 2022-07-16 thomas struct imsgev *
814 8a35f56c 2022-07-16 thomas proc_iev(struct privsep *ps, enum privsep_procid id, int n)
815 8a35f56c 2022-07-16 thomas {
816 8a35f56c 2022-07-16 thomas 	int m;
817 8a35f56c 2022-07-16 thomas 
818 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
819 8a35f56c 2022-07-16 thomas 	return (&ps->ps_ievs[id][n]);
820 8a35f56c 2022-07-16 thomas }
821 8a35f56c 2022-07-16 thomas 
822 8a35f56c 2022-07-16 thomas /* This function should only be called with care as it breaks async I/O */
823 8a35f56c 2022-07-16 thomas int
824 8a35f56c 2022-07-16 thomas proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
825 8a35f56c 2022-07-16 thomas {
826 8a35f56c 2022-07-16 thomas 	struct imsgbuf *ibuf;
827 8a35f56c 2022-07-16 thomas 	int m, ret = 0;
828 8a35f56c 2022-07-16 thomas 
829 8a35f56c 2022-07-16 thomas 	proc_range(ps, id, &n, &m);
830 8a35f56c 2022-07-16 thomas 	for (; n < m; n++) {
831 8a35f56c 2022-07-16 thomas 		ibuf = proc_ibuf(ps, id, n);
832 8a35f56c 2022-07-16 thomas 		if (ibuf == NULL)
833 8a35f56c 2022-07-16 thomas 			return (-1);
834 8a35f56c 2022-07-16 thomas 		do {
835 8a35f56c 2022-07-16 thomas 			ret = imsg_flush(ibuf);
836 8a35f56c 2022-07-16 thomas 		} while (ret == -1 && errno == EAGAIN);
837 8a35f56c 2022-07-16 thomas 		if (ret == -1)
838 8a35f56c 2022-07-16 thomas 			break;
839 8a35f56c 2022-07-16 thomas 		imsg_event_add(&ps->ps_ievs[id][n]);
840 8a35f56c 2022-07-16 thomas 	}
841 8a35f56c 2022-07-16 thomas 
842 8a35f56c 2022-07-16 thomas 	return (ret);
843 8a35f56c 2022-07-16 thomas }