1 a596b957 2022-07-14 tracey /*
  2 a596b957 2022-07-14 tracey  * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
  3 a596b957 2022-07-14 tracey  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
  4 a596b957 2022-07-14 tracey  *
  5 a596b957 2022-07-14 tracey  * Permission to use, copy, modify, and distribute this software for any
  6 a596b957 2022-07-14 tracey  * purpose with or without fee is hereby granted, provided that the above
  7 a596b957 2022-07-14 tracey  * copyright notice and this permission notice appear in all copies.
  8 a596b957 2022-07-14 tracey  *
  9 a596b957 2022-07-14 tracey  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 10 a596b957 2022-07-14 tracey  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 11 a596b957 2022-07-14 tracey  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 12 a596b957 2022-07-14 tracey  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 13 a596b957 2022-07-14 tracey  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 14 a596b957 2022-07-14 tracey  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 15 a596b957 2022-07-14 tracey  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 16 a596b957 2022-07-14 tracey  */
 17 a596b957 2022-07-14 tracey 
 18 a596b957 2022-07-14 tracey #include <sys/types.h>
 19 a596b957 2022-07-14 tracey #include <sys/queue.h>
 20 a596b957 2022-07-14 tracey #include <sys/socket.h>
 21 a596b957 2022-07-14 tracey #include <sys/wait.h>
 22 a596b957 2022-07-14 tracey 
 23 a596b957 2022-07-14 tracey #include <fcntl.h>
 24 a596b957 2022-07-14 tracey #include <stdio.h>
 25 a596b957 2022-07-14 tracey #include <stdlib.h>
 26 a596b957 2022-07-14 tracey #include <unistd.h>
 27 a596b957 2022-07-14 tracey #include <string.h>
 28 a596b957 2022-07-14 tracey #include <errno.h>
 29 a596b957 2022-07-14 tracey #include <signal.h>
 30 a596b957 2022-07-14 tracey #include <pwd.h>
 31 a596b957 2022-07-14 tracey #include <event.h>
 32 a596b957 2022-07-14 tracey #include <imsg.h>
 33 a596b957 2022-07-14 tracey 
 34 a596b957 2022-07-14 tracey #include "proc.h"
 35 a596b957 2022-07-14 tracey 
 36 a596b957 2022-07-14 tracey void	 proc_exec(struct privsep *, struct privsep_proc *, unsigned int,
 37 a596b957 2022-07-14 tracey 	    int, char **);
 38 a596b957 2022-07-14 tracey void	 proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
 39 a596b957 2022-07-14 tracey void	 proc_open(struct privsep *, int, int);
 40 a596b957 2022-07-14 tracey void	 proc_accept(struct privsep *, int, enum privsep_procid,
 41 a596b957 2022-07-14 tracey 	    unsigned int);
 42 a596b957 2022-07-14 tracey void	 proc_close(struct privsep *);
 43 a596b957 2022-07-14 tracey void	 proc_shutdown(struct privsep_proc *);
 44 a596b957 2022-07-14 tracey void	 proc_sig_handler(int, short, void *);
 45 a596b957 2022-07-14 tracey int	 proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
 46 a596b957 2022-07-14 tracey 
 47 a596b957 2022-07-14 tracey enum privsep_procid privsep_process;
 48 a596b957 2022-07-14 tracey 
 49 a596b957 2022-07-14 tracey enum privsep_procid
 50 a596b957 2022-07-14 tracey proc_getid(struct privsep_proc *procs, unsigned int nproc,
 51 a596b957 2022-07-14 tracey     const char *proc_name)
 52 a596b957 2022-07-14 tracey {
 53 a596b957 2022-07-14 tracey 	struct privsep_proc *p;
 54 a596b957 2022-07-14 tracey 	unsigned int proc;
 55 a596b957 2022-07-14 tracey 
 56 a596b957 2022-07-14 tracey 	for (proc = 0; proc < nproc; proc++) {
 57 a596b957 2022-07-14 tracey 		p = &procs[proc];
 58 a596b957 2022-07-14 tracey 		if (strcmp(p->p_title, proc_name))
 59 a596b957 2022-07-14 tracey 			continue;
 60 a596b957 2022-07-14 tracey 
 61 a596b957 2022-07-14 tracey 		return (p->p_id);
 62 a596b957 2022-07-14 tracey 	}
 63 a596b957 2022-07-14 tracey 
 64 a596b957 2022-07-14 tracey 	return (PROC_MAX);
 65 a596b957 2022-07-14 tracey }
 66 a596b957 2022-07-14 tracey 
 67 a596b957 2022-07-14 tracey void
 68 a596b957 2022-07-14 tracey proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
 69 a596b957 2022-07-14 tracey     int argc, char **argv)
 70 a596b957 2022-07-14 tracey {
 71 a596b957 2022-07-14 tracey 	unsigned int proc, nargc, i, proc_i;
 72 a596b957 2022-07-14 tracey 	char **nargv;
 73 a596b957 2022-07-14 tracey 	struct privsep_proc *p;
 74 a596b957 2022-07-14 tracey 	char num[32];
 75 a596b957 2022-07-14 tracey 	int fd;
 76 a596b957 2022-07-14 tracey 
 77 a596b957 2022-07-14 tracey 	/* Prepare the new process argv. */
 78 a596b957 2022-07-14 tracey 	nargv = calloc(argc + 5, sizeof(char *));
 79 a596b957 2022-07-14 tracey 	if (nargv == NULL)
 80 a596b957 2022-07-14 tracey 		fatal("%s: calloc", __func__);
 81 a596b957 2022-07-14 tracey 
 82 a596b957 2022-07-14 tracey 	/* Copy call argument first. */
 83 a596b957 2022-07-14 tracey 	nargc = 0;
 84 a596b957 2022-07-14 tracey 	nargv[nargc++] = argv[0];
 85 a596b957 2022-07-14 tracey 
 86 a596b957 2022-07-14 tracey 	/* Set process name argument and save the position. */
 87 a596b957 2022-07-14 tracey 	nargv[nargc] = strdup("-P");
 88 a596b957 2022-07-14 tracey 	if (nargv[nargc] == NULL)
 89 a596b957 2022-07-14 tracey 		fatal("%s: strdup", __func__);
 90 a596b957 2022-07-14 tracey 	nargc++;
 91 a596b957 2022-07-14 tracey 	proc_i = nargc;
 92 a596b957 2022-07-14 tracey 	nargc++;
 93 a596b957 2022-07-14 tracey 
 94 a596b957 2022-07-14 tracey 	/* Point process instance arg to stack and copy the original args. */
 95 a596b957 2022-07-14 tracey 	nargv[nargc] = strdup("-I");
 96 a596b957 2022-07-14 tracey 	if (nargv[nargc] == NULL)
 97 a596b957 2022-07-14 tracey 		fatal("%s: strdup", __func__);
 98 a596b957 2022-07-14 tracey 	nargc++;
 99 a596b957 2022-07-14 tracey 	nargv[nargc++] = num;
100 a596b957 2022-07-14 tracey 	for (i = 1; i < (unsigned int) argc; i++)
101 a596b957 2022-07-14 tracey 		nargv[nargc++] = argv[i];
102 a596b957 2022-07-14 tracey 
103 a596b957 2022-07-14 tracey 	nargv[nargc] = NULL;
104 a596b957 2022-07-14 tracey 
105 a596b957 2022-07-14 tracey 	for (proc = 0; proc < nproc; proc++) {
106 a596b957 2022-07-14 tracey 		p = &procs[proc];
107 a596b957 2022-07-14 tracey 
108 a596b957 2022-07-14 tracey 		/* Update args with process title. */
109 a596b957 2022-07-14 tracey 		nargv[proc_i] = (char *)(uintptr_t)p->p_title;
110 a596b957 2022-07-14 tracey 
111 a596b957 2022-07-14 tracey 		/* Fire children processes. */
112 a596b957 2022-07-14 tracey 		for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
113 a596b957 2022-07-14 tracey 			/* Update the process instance number. */
114 a596b957 2022-07-14 tracey 			snprintf(num, sizeof(num), "%u", i);
115 a596b957 2022-07-14 tracey 
116 a596b957 2022-07-14 tracey 			fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0];
117 a596b957 2022-07-14 tracey 			ps->ps_pipes[p->p_id][i].pp_pipes[PROC_GOTWEBD][0] = -1;
118 a596b957 2022-07-14 tracey 
119 a596b957 2022-07-14 tracey 			switch (fork()) {
120 a596b957 2022-07-14 tracey 			case -1:
121 a596b957 2022-07-14 tracey 				fatal("%s: fork", __func__);
122 a596b957 2022-07-14 tracey 				break;
123 a596b957 2022-07-14 tracey 			case 0:
124 a596b957 2022-07-14 tracey 				/* First create a new session */
125 a596b957 2022-07-14 tracey 				if (setsid() == -1)
126 a596b957 2022-07-14 tracey 					fatal("setsid");
127 a596b957 2022-07-14 tracey 
128 a596b957 2022-07-14 tracey 				/* Prepare parent socket. */
129 a596b957 2022-07-14 tracey 				if (fd != PROC_GOTWEBD_SOCK_FILENO) {
130 a596b957 2022-07-14 tracey 					if (dup2(fd, PROC_GOTWEBD_SOCK_FILENO)
131 a596b957 2022-07-14 tracey 					    == -1)
132 a596b957 2022-07-14 tracey 						fatal("dup2");
133 a596b957 2022-07-14 tracey 				} else if (fcntl(fd, F_SETFD, 0) == -1)
134 a596b957 2022-07-14 tracey 					fatal("fcntl");
135 a596b957 2022-07-14 tracey 
136 a596b957 2022-07-14 tracey 				execvp(argv[0], nargv);
137 a596b957 2022-07-14 tracey 				fatal("%s: execvp", __func__);
138 a596b957 2022-07-14 tracey 				break;
139 a596b957 2022-07-14 tracey 			default:
140 a596b957 2022-07-14 tracey 				/* Close child end. */
141 a596b957 2022-07-14 tracey 				close(fd);
142 a596b957 2022-07-14 tracey 				break;
143 a596b957 2022-07-14 tracey 			}
144 a596b957 2022-07-14 tracey 		}
145 a596b957 2022-07-14 tracey 	}
146 a596b957 2022-07-14 tracey 
147 a596b957 2022-07-14 tracey 	free(nargv);
148 a596b957 2022-07-14 tracey }
149 a596b957 2022-07-14 tracey 
150 a596b957 2022-07-14 tracey void
151 a596b957 2022-07-14 tracey proc_connect(struct privsep *ps)
152 a596b957 2022-07-14 tracey {
153 a596b957 2022-07-14 tracey 	struct imsgev *iev;
154 a596b957 2022-07-14 tracey 	unsigned int src, dst, inst;
155 a596b957 2022-07-14 tracey 
156 a596b957 2022-07-14 tracey 	/* Don't distribute any sockets if we are not really going to run. */
157 a596b957 2022-07-14 tracey 	if (ps->ps_noaction)
158 a596b957 2022-07-14 tracey 		return;
159 a596b957 2022-07-14 tracey 
160 a596b957 2022-07-14 tracey 	for (dst = 0; dst < PROC_MAX; dst++) {
161 a596b957 2022-07-14 tracey 		/* We don't communicate with ourselves. */
162 a596b957 2022-07-14 tracey 		if (dst == PROC_GOTWEBD)
163 a596b957 2022-07-14 tracey 			continue;
164 a596b957 2022-07-14 tracey 
165 a596b957 2022-07-14 tracey 		for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
166 a596b957 2022-07-14 tracey 			iev = &ps->ps_ievs[dst][inst];
167 a596b957 2022-07-14 tracey 			imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
168 a596b957 2022-07-14 tracey 			event_set(&iev->ev, iev->ibuf.fd, iev->events,
169 a596b957 2022-07-14 tracey 			    iev->handler, iev->data);
170 a596b957 2022-07-14 tracey 			event_add(&iev->ev, NULL);
171 a596b957 2022-07-14 tracey 		}
172 a596b957 2022-07-14 tracey 	}
173 a596b957 2022-07-14 tracey 
174 a596b957 2022-07-14 tracey 	/* Distribute the socketpair()s for everyone. */
175 a596b957 2022-07-14 tracey 	for (src = 0; src < PROC_MAX; src++)
176 a596b957 2022-07-14 tracey 		for (dst = src; dst < PROC_MAX; dst++) {
177 a596b957 2022-07-14 tracey 			/* Parent already distributed its fds. */
178 a596b957 2022-07-14 tracey 			if (src == PROC_GOTWEBD || dst == PROC_GOTWEBD)
179 a596b957 2022-07-14 tracey 				continue;
180 a596b957 2022-07-14 tracey 
181 a596b957 2022-07-14 tracey 			proc_open(ps, src, dst);
182 a596b957 2022-07-14 tracey 		}
183 a596b957 2022-07-14 tracey }
184 a596b957 2022-07-14 tracey 
185 a596b957 2022-07-14 tracey void
186 a596b957 2022-07-14 tracey proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
187 a596b957 2022-07-14 tracey     int argc, char **argv, enum privsep_procid proc_id)
188 a596b957 2022-07-14 tracey {
189 a596b957 2022-07-14 tracey 	struct privsep_proc *p = NULL;
190 a596b957 2022-07-14 tracey 	struct privsep_pipes *pa, *pb;
191 a596b957 2022-07-14 tracey 	unsigned int proc;
192 a596b957 2022-07-14 tracey 	unsigned int dst;
193 a596b957 2022-07-14 tracey 	int fds[2];
194 a596b957 2022-07-14 tracey 
195 a596b957 2022-07-14 tracey 	/* Don't initiate anything if we are not really going to run. */
196 a596b957 2022-07-14 tracey 	if (ps->ps_noaction)
197 a596b957 2022-07-14 tracey 		return;
198 a596b957 2022-07-14 tracey 
199 a596b957 2022-07-14 tracey 	if (proc_id == PROC_GOTWEBD) {
200 a596b957 2022-07-14 tracey 		privsep_process = PROC_GOTWEBD;
201 a596b957 2022-07-14 tracey 		proc_setup(ps, procs, nproc);
202 a596b957 2022-07-14 tracey 
203 a596b957 2022-07-14 tracey 		/*
204 5e91dae4 2022-08-30 stsp 		 * Create the children sockets so we can use them
205 a596b957 2022-07-14 tracey 		 * to distribute the rest of the socketpair()s using
206 a596b957 2022-07-14 tracey 		 * proc_connect() later.
207 a596b957 2022-07-14 tracey 		 */
208 a596b957 2022-07-14 tracey 		for (dst = 0; dst < PROC_MAX; dst++) {
209 a596b957 2022-07-14 tracey 			/* Don't create socket for ourselves. */
210 a596b957 2022-07-14 tracey 			if (dst == PROC_GOTWEBD)
211 a596b957 2022-07-14 tracey 				continue;
212 a596b957 2022-07-14 tracey 
213 a596b957 2022-07-14 tracey 			for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
214 a596b957 2022-07-14 tracey 				pa = &ps->ps_pipes[PROC_GOTWEBD][0];
215 a596b957 2022-07-14 tracey 				pb = &ps->ps_pipes[dst][proc];
216 a596b957 2022-07-14 tracey 				if (socketpair(AF_UNIX,
217 a596b957 2022-07-14 tracey 				    SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
218 a596b957 2022-07-14 tracey 				    PF_UNSPEC, fds) == -1)
219 a596b957 2022-07-14 tracey 					fatal("%s: socketpair", __func__);
220 a596b957 2022-07-14 tracey 
221 a596b957 2022-07-14 tracey 				pa->pp_pipes[dst][proc] = fds[0];
222 a596b957 2022-07-14 tracey 				pb->pp_pipes[PROC_GOTWEBD][0] = fds[1];
223 a596b957 2022-07-14 tracey 			}
224 a596b957 2022-07-14 tracey 		}
225 a596b957 2022-07-14 tracey 
226 a596b957 2022-07-14 tracey 		/* Engage! */
227 a596b957 2022-07-14 tracey 		proc_exec(ps, procs, nproc, argc, argv);
228 a596b957 2022-07-14 tracey 		return;
229 a596b957 2022-07-14 tracey 	}
230 a596b957 2022-07-14 tracey 
231 a596b957 2022-07-14 tracey 	/* Initialize a child */
232 a596b957 2022-07-14 tracey 	for (proc = 0; proc < nproc; proc++) {
233 a596b957 2022-07-14 tracey 		if (procs[proc].p_id != proc_id)
234 a596b957 2022-07-14 tracey 			continue;
235 a596b957 2022-07-14 tracey 		p = &procs[proc];
236 a596b957 2022-07-14 tracey 		break;
237 a596b957 2022-07-14 tracey 	}
238 a596b957 2022-07-14 tracey 	if (p == NULL || p->p_init == NULL)
239 a596b957 2022-07-14 tracey 		fatalx("%s: process %d missing process initialization",
240 a596b957 2022-07-14 tracey 		    __func__, proc_id);
241 a596b957 2022-07-14 tracey 
242 a596b957 2022-07-14 tracey 	p->p_init(ps, p);
243 a596b957 2022-07-14 tracey 
244 a596b957 2022-07-14 tracey 	fatalx("failed to initiate child process");
245 a596b957 2022-07-14 tracey }
246 a596b957 2022-07-14 tracey 
247 a596b957 2022-07-14 tracey void
248 a596b957 2022-07-14 tracey proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
249 a596b957 2022-07-14 tracey     unsigned int n)
250 a596b957 2022-07-14 tracey {
251 a596b957 2022-07-14 tracey 	struct privsep_pipes *pp = ps->ps_pp;
252 a596b957 2022-07-14 tracey 	struct imsgev *iev;
253 a596b957 2022-07-14 tracey 
254 a596b957 2022-07-14 tracey 	if (ps->ps_ievs[dst] == NULL) {
255 a596b957 2022-07-14 tracey #if DEBUG > 1
256 a596b957 2022-07-14 tracey 		log_debug("%s: %s src %d %d to dst %d %d not connected",
257 a596b957 2022-07-14 tracey 		    __func__, ps->ps_title[privsep_process],
258 a596b957 2022-07-14 tracey 		    privsep_process, ps->ps_instance + 1,
259 a596b957 2022-07-14 tracey 		    dst, n + 1);
260 a596b957 2022-07-14 tracey #endif
261 a596b957 2022-07-14 tracey 		close(fd);
262 a596b957 2022-07-14 tracey 		return;
263 a596b957 2022-07-14 tracey 	}
264 a596b957 2022-07-14 tracey 
265 a596b957 2022-07-14 tracey 	if (pp->pp_pipes[dst][n] != -1) {
266 a596b957 2022-07-14 tracey 		log_warnx("%s: duplicated descriptor", __func__);
267 a596b957 2022-07-14 tracey 		close(fd);
268 a596b957 2022-07-14 tracey 		return;
269 a596b957 2022-07-14 tracey 	} else
270 a596b957 2022-07-14 tracey 		pp->pp_pipes[dst][n] = fd;
271 a596b957 2022-07-14 tracey 
272 a596b957 2022-07-14 tracey 	iev = &ps->ps_ievs[dst][n];
273 a596b957 2022-07-14 tracey 	imsg_init(&iev->ibuf, fd);
274 a596b957 2022-07-14 tracey 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
275 a596b957 2022-07-14 tracey 	event_add(&iev->ev, NULL);
276 a596b957 2022-07-14 tracey }
277 a596b957 2022-07-14 tracey 
278 a596b957 2022-07-14 tracey void
279 a596b957 2022-07-14 tracey proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
280 a596b957 2022-07-14 tracey {
281 a596b957 2022-07-14 tracey 	unsigned int i, j, src, dst, id;
282 a596b957 2022-07-14 tracey 	struct privsep_pipes *pp;
283 a596b957 2022-07-14 tracey 
284 a596b957 2022-07-14 tracey 	/* Initialize parent title, ps_instances and procs. */
285 a596b957 2022-07-14 tracey 	ps->ps_title[PROC_GOTWEBD] = "parent";
286 a596b957 2022-07-14 tracey 
287 a596b957 2022-07-14 tracey 	for (src = 0; src < PROC_MAX; src++)
288 a596b957 2022-07-14 tracey 		/* Default to 1 process instance */
289 a596b957 2022-07-14 tracey 		if (ps->ps_instances[src] < 1)
290 a596b957 2022-07-14 tracey 			ps->ps_instances[src] = 1;
291 a596b957 2022-07-14 tracey 
292 a596b957 2022-07-14 tracey 	for (src = 0; src < nproc; src++) {
293 a596b957 2022-07-14 tracey 		procs[src].p_ps = ps;
294 a596b957 2022-07-14 tracey 		if (procs[src].p_cb == NULL)
295 a596b957 2022-07-14 tracey 			procs[src].p_cb = proc_dispatch_null;
296 a596b957 2022-07-14 tracey 
297 a596b957 2022-07-14 tracey 		id = procs[src].p_id;
298 a596b957 2022-07-14 tracey 		ps->ps_title[id] = procs[src].p_title;
299 a596b957 2022-07-14 tracey 		ps->ps_ievs[id] = calloc(ps->ps_instances[id],
300 a596b957 2022-07-14 tracey 		    sizeof(struct imsgev));
301 a596b957 2022-07-14 tracey 		if (ps->ps_ievs[id] == NULL)
302 a596b957 2022-07-14 tracey 			fatal("%s: calloc", __func__);
303 a596b957 2022-07-14 tracey 
304 a596b957 2022-07-14 tracey 		/* With this set up, we are ready to call imsg_init(). */
305 a596b957 2022-07-14 tracey 		for (i = 0; i < ps->ps_instances[id]; i++) {
306 a596b957 2022-07-14 tracey 			ps->ps_ievs[id][i].handler = proc_dispatch;
307 a596b957 2022-07-14 tracey 			ps->ps_ievs[id][i].events = EV_READ;
308 a596b957 2022-07-14 tracey 			ps->ps_ievs[id][i].proc = &procs[src];
309 a596b957 2022-07-14 tracey 			ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
310 a596b957 2022-07-14 tracey 		}
311 a596b957 2022-07-14 tracey 	}
312 a596b957 2022-07-14 tracey 
313 a596b957 2022-07-14 tracey 	/*
314 a596b957 2022-07-14 tracey 	 * Allocate pipes for all process instances (incl. parent)
315 a596b957 2022-07-14 tracey 	 *
316 a596b957 2022-07-14 tracey 	 * - ps->ps_pipes: N:M mapping
317 a596b957 2022-07-14 tracey 	 * N source processes connected to M destination processes:
318 a596b957 2022-07-14 tracey 	 * [src][instances][dst][instances], for example
319 a596b957 2022-07-14 tracey 	 * [PROC_RELAY][3][PROC_CA][3]
320 a596b957 2022-07-14 tracey 	 *
321 a596b957 2022-07-14 tracey 	 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
322 a596b957 2022-07-14 tracey 	 * Each process instance has a destination array of socketpair fds:
323 a596b957 2022-07-14 tracey 	 * [dst][instances], for example
324 a596b957 2022-07-14 tracey 	 * [PROC_GOTWEBD][0]
325 a596b957 2022-07-14 tracey 	 */
326 a596b957 2022-07-14 tracey 	for (src = 0; src < PROC_MAX; src++) {
327 a596b957 2022-07-14 tracey 		/* Allocate destination array for each process */
328 a596b957 2022-07-14 tracey 		ps->ps_pipes[src] = calloc(ps->ps_instances[src],
329 a596b957 2022-07-14 tracey 		    sizeof(struct privsep_pipes));
330 a596b957 2022-07-14 tracey 		if (ps->ps_pipes[src] == NULL)
331 a596b957 2022-07-14 tracey 			fatal("%s: calloc", __func__);
332 a596b957 2022-07-14 tracey 
333 a596b957 2022-07-14 tracey 		for (i = 0; i < ps->ps_instances[src]; i++) {
334 a596b957 2022-07-14 tracey 			pp = &ps->ps_pipes[src][i];
335 a596b957 2022-07-14 tracey 
336 a596b957 2022-07-14 tracey 			for (dst = 0; dst < PROC_MAX; dst++) {
337 a596b957 2022-07-14 tracey 				/* Allocate maximum fd integers */
338 a596b957 2022-07-14 tracey 				pp->pp_pipes[dst] =
339 a596b957 2022-07-14 tracey 				    calloc(ps->ps_instances[dst],
340 a596b957 2022-07-14 tracey 				    sizeof(int));
341 a596b957 2022-07-14 tracey 				if (pp->pp_pipes[dst] == NULL)
342 a596b957 2022-07-14 tracey 					fatal("%s: calloc", __func__);
343 a596b957 2022-07-14 tracey 
344 a596b957 2022-07-14 tracey 				/* Mark fd as unused */
345 a596b957 2022-07-14 tracey 				for (j = 0; j < ps->ps_instances[dst]; j++)
346 a596b957 2022-07-14 tracey 					pp->pp_pipes[dst][j] = -1;
347 a596b957 2022-07-14 tracey 			}
348 a596b957 2022-07-14 tracey 		}
349 a596b957 2022-07-14 tracey 	}
350 a596b957 2022-07-14 tracey 
351 a596b957 2022-07-14 tracey 	ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
352 a596b957 2022-07-14 tracey }
353 a596b957 2022-07-14 tracey 
354 a596b957 2022-07-14 tracey void
355 a596b957 2022-07-14 tracey proc_kill(struct privsep *ps)
356 a596b957 2022-07-14 tracey {
357 a596b957 2022-07-14 tracey 	char *cause;
358 a596b957 2022-07-14 tracey 	pid_t pid;
359 a596b957 2022-07-14 tracey 	int len, status;
360 a596b957 2022-07-14 tracey 
361 a596b957 2022-07-14 tracey 	if (privsep_process != PROC_GOTWEBD)
362 a596b957 2022-07-14 tracey 		return;
363 a596b957 2022-07-14 tracey 
364 a596b957 2022-07-14 tracey 	proc_close(ps);
365 a596b957 2022-07-14 tracey 
366 a596b957 2022-07-14 tracey 	do {
367 a596b957 2022-07-14 tracey 		pid = waitpid(WAIT_ANY, &status, 0);
368 a596b957 2022-07-14 tracey 		if (pid <= 0)
369 a596b957 2022-07-14 tracey 			continue;
370 a596b957 2022-07-14 tracey 
371 a596b957 2022-07-14 tracey 		if (WIFSIGNALED(status)) {
372 a596b957 2022-07-14 tracey 			len = asprintf(&cause, "terminated; signal %d",
373 a596b957 2022-07-14 tracey 			    WTERMSIG(status));
374 a596b957 2022-07-14 tracey 		} else if (WIFEXITED(status)) {
375 a596b957 2022-07-14 tracey 			if (WEXITSTATUS(status) != 0)
376 a596b957 2022-07-14 tracey 				len = asprintf(&cause, "exited abnormally");
377 a596b957 2022-07-14 tracey 			else
378 a596b957 2022-07-14 tracey 				len = 0;
379 a596b957 2022-07-14 tracey 		} else
380 a596b957 2022-07-14 tracey 			len = -1;
381 a596b957 2022-07-14 tracey 
382 a596b957 2022-07-14 tracey 		if (len == 0) {
383 a596b957 2022-07-14 tracey 			/* child exited OK, don't print a warning message */
384 a596b957 2022-07-14 tracey 		} else if (len != -1) {
385 a596b957 2022-07-14 tracey 			log_warnx("lost child: pid %u %s", pid, cause);
386 a596b957 2022-07-14 tracey 			free(cause);
387 a596b957 2022-07-14 tracey 		} else
388 a596b957 2022-07-14 tracey 			log_warnx("lost child: pid %u", pid);
389 a596b957 2022-07-14 tracey 	} while (pid != -1 || (pid == -1 && errno == EINTR));
390 a596b957 2022-07-14 tracey }
391 a596b957 2022-07-14 tracey 
392 a596b957 2022-07-14 tracey void
393 a596b957 2022-07-14 tracey proc_open(struct privsep *ps, int src, int dst)
394 a596b957 2022-07-14 tracey {
395 a596b957 2022-07-14 tracey 	struct privsep_pipes *pa, *pb;
396 a596b957 2022-07-14 tracey 	struct privsep_fd pf;
397 a596b957 2022-07-14 tracey 	int fds[2];
398 a596b957 2022-07-14 tracey 	unsigned int i, j;
399 a596b957 2022-07-14 tracey 
400 a596b957 2022-07-14 tracey 	/* Exchange pipes between process. */
401 a596b957 2022-07-14 tracey 	for (i = 0; i < ps->ps_instances[src]; i++) {
402 a596b957 2022-07-14 tracey 		for (j = 0; j < ps->ps_instances[dst]; j++) {
403 a596b957 2022-07-14 tracey 			/* Don't create sockets for ourself. */
404 a596b957 2022-07-14 tracey 			if (src == dst && i == j)
405 a596b957 2022-07-14 tracey 				continue;
406 a596b957 2022-07-14 tracey 
407 a596b957 2022-07-14 tracey 			pa = &ps->ps_pipes[src][i];
408 a596b957 2022-07-14 tracey 			pb = &ps->ps_pipes[dst][j];
409 a596b957 2022-07-14 tracey 			if (socketpair(AF_UNIX,
410 a596b957 2022-07-14 tracey 			    SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
411 a596b957 2022-07-14 tracey 			    PF_UNSPEC, fds) == -1)
412 a596b957 2022-07-14 tracey 				fatal("%s: socketpair", __func__);
413 a596b957 2022-07-14 tracey 
414 a596b957 2022-07-14 tracey 			pa->pp_pipes[dst][j] = fds[0];
415 a596b957 2022-07-14 tracey 			pb->pp_pipes[src][i] = fds[1];
416 a596b957 2022-07-14 tracey 
417 a596b957 2022-07-14 tracey 			pf.pf_procid = src;
418 a596b957 2022-07-14 tracey 			pf.pf_instance = i;
419 a596b957 2022-07-14 tracey 			if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
420 a596b957 2022-07-14 tracey 			    -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
421 a596b957 2022-07-14 tracey 				fatal("%s: proc_compose_imsg", __func__);
422 a596b957 2022-07-14 tracey 
423 a596b957 2022-07-14 tracey 			pf.pf_procid = dst;
424 a596b957 2022-07-14 tracey 			pf.pf_instance = j;
425 a596b957 2022-07-14 tracey 			if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
426 a596b957 2022-07-14 tracey 			    -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
427 a596b957 2022-07-14 tracey 				fatal("%s: proc_compose_imsg", __func__);
428 a596b957 2022-07-14 tracey 
429 a596b957 2022-07-14 tracey 			/*
430 a596b957 2022-07-14 tracey 			 * We have to flush to send the descriptors and close
431 a596b957 2022-07-14 tracey 			 * them to avoid the fd ramp on startup.
432 a596b957 2022-07-14 tracey 			 */
433 a596b957 2022-07-14 tracey 			if (proc_flush_imsg(ps, src, i) == -1 ||
434 a596b957 2022-07-14 tracey 			    proc_flush_imsg(ps, dst, j) == -1)
435 a596b957 2022-07-14 tracey 				fatal("%s: imsg_flush", __func__);
436 a596b957 2022-07-14 tracey 		}
437 a596b957 2022-07-14 tracey 	}
438 a596b957 2022-07-14 tracey }
439 a596b957 2022-07-14 tracey 
440 a596b957 2022-07-14 tracey void
441 a596b957 2022-07-14 tracey proc_close(struct privsep *ps)
442 a596b957 2022-07-14 tracey {
443 a596b957 2022-07-14 tracey 	unsigned int dst, n;
444 a596b957 2022-07-14 tracey 	struct privsep_pipes *pp;
445 a596b957 2022-07-14 tracey 
446 a596b957 2022-07-14 tracey 	if (ps == NULL)
447 a596b957 2022-07-14 tracey 		return;
448 a596b957 2022-07-14 tracey 
449 a596b957 2022-07-14 tracey 	pp = ps->ps_pp;
450 a596b957 2022-07-14 tracey 
451 a596b957 2022-07-14 tracey 	for (dst = 0; dst < PROC_MAX; dst++) {
452 a596b957 2022-07-14 tracey 		if (ps->ps_ievs[dst] == NULL)
453 a596b957 2022-07-14 tracey 			continue;
454 a596b957 2022-07-14 tracey 
455 a596b957 2022-07-14 tracey 		for (n = 0; n < ps->ps_instances[dst]; n++) {
456 a596b957 2022-07-14 tracey 			if (pp->pp_pipes[dst][n] == -1)
457 a596b957 2022-07-14 tracey 				continue;
458 a596b957 2022-07-14 tracey 
459 a596b957 2022-07-14 tracey 			/* Cancel the fd, close and invalidate the fd */
460 a596b957 2022-07-14 tracey 			event_del(&(ps->ps_ievs[dst][n].ev));
461 a596b957 2022-07-14 tracey 			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
462 a596b957 2022-07-14 tracey 			close(pp->pp_pipes[dst][n]);
463 a596b957 2022-07-14 tracey 			pp->pp_pipes[dst][n] = -1;
464 a596b957 2022-07-14 tracey 		}
465 a596b957 2022-07-14 tracey 		free(ps->ps_ievs[dst]);
466 a596b957 2022-07-14 tracey 	}
467 a596b957 2022-07-14 tracey }
468 a596b957 2022-07-14 tracey 
469 a596b957 2022-07-14 tracey void
470 a596b957 2022-07-14 tracey proc_shutdown(struct privsep_proc *p)
471 a596b957 2022-07-14 tracey {
472 a596b957 2022-07-14 tracey 	struct privsep *ps = p->p_ps;
473 a596b957 2022-07-14 tracey 
474 a596b957 2022-07-14 tracey 	if (p->p_shutdown != NULL)
475 a596b957 2022-07-14 tracey 		(*p->p_shutdown)();
476 a596b957 2022-07-14 tracey 
477 a596b957 2022-07-14 tracey 	proc_close(ps);
478 a596b957 2022-07-14 tracey 
479 a596b957 2022-07-14 tracey 	log_info("%s, %s exiting, pid %d", getprogname(), p->p_title, getpid());
480 a596b957 2022-07-14 tracey 
481 a596b957 2022-07-14 tracey 	exit(0);
482 a596b957 2022-07-14 tracey }
483 a596b957 2022-07-14 tracey 
484 a596b957 2022-07-14 tracey void
485 a596b957 2022-07-14 tracey proc_sig_handler(int sig, short event, void *arg)
486 a596b957 2022-07-14 tracey {
487 a596b957 2022-07-14 tracey 	struct privsep_proc *p = arg;
488 a596b957 2022-07-14 tracey 
489 a596b957 2022-07-14 tracey 	switch (sig) {
490 a596b957 2022-07-14 tracey 	case SIGINT:
491 a596b957 2022-07-14 tracey 	case SIGTERM:
492 a596b957 2022-07-14 tracey 		proc_shutdown(p);
493 a596b957 2022-07-14 tracey 		break;
494 a596b957 2022-07-14 tracey 	case SIGCHLD:
495 a596b957 2022-07-14 tracey 	case SIGHUP:
496 a596b957 2022-07-14 tracey 	case SIGPIPE:
497 a596b957 2022-07-14 tracey 	case SIGUSR1:
498 a596b957 2022-07-14 tracey 		/* ignore */
499 a596b957 2022-07-14 tracey 		break;
500 a596b957 2022-07-14 tracey 	default:
501 a596b957 2022-07-14 tracey 		fatalx("proc_sig_handler: unexpected signal");
502 a596b957 2022-07-14 tracey 		/* NOTREACHED */
503 a596b957 2022-07-14 tracey 	}
504 a596b957 2022-07-14 tracey }
505 a596b957 2022-07-14 tracey 
506 a596b957 2022-07-14 tracey void
507 a596b957 2022-07-14 tracey proc_run(struct privsep *ps, struct privsep_proc *p,
508 a596b957 2022-07-14 tracey     struct privsep_proc *procs, unsigned int nproc,
509 a596b957 2022-07-14 tracey     void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
510 a596b957 2022-07-14 tracey {
511 a596b957 2022-07-14 tracey 	struct passwd *pw;
512 a596b957 2022-07-14 tracey 	const char *root;
513 a596b957 2022-07-14 tracey 
514 a596b957 2022-07-14 tracey 	log_procinit(p->p_title);
515 a596b957 2022-07-14 tracey 
516 a596b957 2022-07-14 tracey 	/* Set the process group of the current process */
517 a596b957 2022-07-14 tracey 	setpgid(0, 0);
518 a596b957 2022-07-14 tracey 
519 a596b957 2022-07-14 tracey 	/* Use non-standard user */
520 a596b957 2022-07-14 tracey 	if (p->p_pw != NULL)
521 a596b957 2022-07-14 tracey 		pw = p->p_pw;
522 a596b957 2022-07-14 tracey 	else
523 a596b957 2022-07-14 tracey 		pw = ps->ps_pw;
524 a596b957 2022-07-14 tracey 
525 a596b957 2022-07-14 tracey 	/* Change root directory */
526 a596b957 2022-07-14 tracey 	if (p->p_chroot != NULL)
527 a596b957 2022-07-14 tracey 		root = p->p_chroot;
528 a596b957 2022-07-14 tracey 	else
529 a596b957 2022-07-14 tracey 		root = pw->pw_dir;
530 a596b957 2022-07-14 tracey 
531 a596b957 2022-07-14 tracey 	if (chroot(root) == -1)
532 a596b957 2022-07-14 tracey 		fatal("proc_run: chroot");
533 a596b957 2022-07-14 tracey 	if (chdir("/") == -1)
534 a596b957 2022-07-14 tracey 		fatal("proc_run: chdir(\"/\")");
535 a596b957 2022-07-14 tracey 
536 a596b957 2022-07-14 tracey 	privsep_process = p->p_id;
537 a596b957 2022-07-14 tracey 
538 a596b957 2022-07-14 tracey 	setproctitle("%s", p->p_title);
539 a596b957 2022-07-14 tracey 
540 a596b957 2022-07-14 tracey 	if (setgroups(1, &pw->pw_gid) ||
541 a596b957 2022-07-14 tracey 	    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
542 a596b957 2022-07-14 tracey 	    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
543 a596b957 2022-07-14 tracey 		fatal("proc_run: cannot drop privileges");
544 a596b957 2022-07-14 tracey 
545 a596b957 2022-07-14 tracey 	event_init();
546 a596b957 2022-07-14 tracey 
547 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
548 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
549 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
550 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
551 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
552 a596b957 2022-07-14 tracey 	signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
553 a596b957 2022-07-14 tracey 
554 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsigint, NULL);
555 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsigterm, NULL);
556 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsigchld, NULL);
557 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsighup, NULL);
558 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsigpipe, NULL);
559 a596b957 2022-07-14 tracey 	signal_add(&ps->ps_evsigusr1, NULL);
560 a596b957 2022-07-14 tracey 
561 a596b957 2022-07-14 tracey 	proc_setup(ps, procs, nproc);
562 a596b957 2022-07-14 tracey 	proc_accept(ps, PROC_GOTWEBD_SOCK_FILENO, PROC_GOTWEBD, 0);
563 a596b957 2022-07-14 tracey 
564 a596b957 2022-07-14 tracey 	DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title,
565 a596b957 2022-07-14 tracey 	    ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
566 a596b957 2022-07-14 tracey 
567 a596b957 2022-07-14 tracey 	if (run != NULL)
568 a596b957 2022-07-14 tracey 		run(ps, p, arg);
569 a596b957 2022-07-14 tracey 
570 a596b957 2022-07-14 tracey 	event_dispatch();
571 a596b957 2022-07-14 tracey 
572 a596b957 2022-07-14 tracey 	proc_shutdown(p);
573 a596b957 2022-07-14 tracey }
574 a596b957 2022-07-14 tracey 
575 a596b957 2022-07-14 tracey void
576 a596b957 2022-07-14 tracey proc_dispatch(int fd, short event, void *arg)
577 a596b957 2022-07-14 tracey {
578 a596b957 2022-07-14 tracey 	struct imsgev *iev = arg;
579 a596b957 2022-07-14 tracey 	struct privsep_proc *p = iev->proc;
580 a596b957 2022-07-14 tracey 	struct privsep *ps = p->p_ps;
581 a596b957 2022-07-14 tracey 	struct imsgbuf *ibuf;
582 a596b957 2022-07-14 tracey 	struct imsg imsg;
583 a596b957 2022-07-14 tracey 	ssize_t n;
584 a596b957 2022-07-14 tracey 	int verbose;
585 a596b957 2022-07-14 tracey 	const char *title;
586 a596b957 2022-07-14 tracey 	struct privsep_fd pf;
587 a596b957 2022-07-14 tracey 
588 a596b957 2022-07-14 tracey 	title = ps->ps_title[privsep_process];
589 a596b957 2022-07-14 tracey 	ibuf = &iev->ibuf;
590 a596b957 2022-07-14 tracey 
591 a596b957 2022-07-14 tracey 	if (event & EV_READ) {
592 a596b957 2022-07-14 tracey 		n = imsg_read(ibuf);
593 a596b957 2022-07-14 tracey 		if (n == -1 && errno != EAGAIN)
594 a596b957 2022-07-14 tracey 			fatal("%s: imsg_read", __func__);
595 a596b957 2022-07-14 tracey 		if (n == 0) {
596 a596b957 2022-07-14 tracey 			/* this pipe is dead, so remove the event handler */
597 a596b957 2022-07-14 tracey 			event_del(&iev->ev);
598 a596b957 2022-07-14 tracey 			event_loopexit(NULL);
599 a596b957 2022-07-14 tracey 			return;
600 a596b957 2022-07-14 tracey 		}
601 a596b957 2022-07-14 tracey 	}
602 a596b957 2022-07-14 tracey 
603 a596b957 2022-07-14 tracey 	if (event & EV_WRITE) {
604 a596b957 2022-07-14 tracey 		n = msgbuf_write(&ibuf->w);
605 a596b957 2022-07-14 tracey 		if (n == -1 && errno != EAGAIN)
606 a596b957 2022-07-14 tracey 			fatal("%s: msgbuf_write", __func__);
607 a596b957 2022-07-14 tracey 		if (n == 0) {
608 a596b957 2022-07-14 tracey 			/* this pipe is dead, so remove the event handler */
609 a596b957 2022-07-14 tracey 			event_del(&iev->ev);
610 a596b957 2022-07-14 tracey 			event_loopexit(NULL);
611 a596b957 2022-07-14 tracey 			return;
612 a596b957 2022-07-14 tracey 		}
613 a596b957 2022-07-14 tracey 	}
614 a596b957 2022-07-14 tracey 
615 a596b957 2022-07-14 tracey 	for (;;) {
616 a596b957 2022-07-14 tracey 		n = imsg_get(ibuf, &imsg);
617 a596b957 2022-07-14 tracey 		if (n == -1)
618 a596b957 2022-07-14 tracey 			fatal("%s: imsg_get", __func__);
619 a596b957 2022-07-14 tracey 		if (n == 0)
620 a596b957 2022-07-14 tracey 			break;
621 a596b957 2022-07-14 tracey 
622 a596b957 2022-07-14 tracey #if DEBUG > 1
623 a596b957 2022-07-14 tracey 		log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
624 a596b957 2022-07-14 tracey 		    __func__, title, ps->ps_instance + 1,
625 a596b957 2022-07-14 tracey 		    imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
626 a596b957 2022-07-14 tracey #endif
627 a596b957 2022-07-14 tracey 
628 a596b957 2022-07-14 tracey 		/*
629 a596b957 2022-07-14 tracey 		 * Check the message with the program callback
630 a596b957 2022-07-14 tracey 		 */
631 a596b957 2022-07-14 tracey 		if ((p->p_cb)(fd, p, &imsg) == 0) {
632 a596b957 2022-07-14 tracey 			/* Message was handled by the callback, continue */
633 a596b957 2022-07-14 tracey 			imsg_free(&imsg);
634 a596b957 2022-07-14 tracey 			continue;
635 a596b957 2022-07-14 tracey 		}
636 a596b957 2022-07-14 tracey 
637 a596b957 2022-07-14 tracey 		/*
638 a596b957 2022-07-14 tracey 		 * Generic message handling
639 a596b957 2022-07-14 tracey 		 */
640 a596b957 2022-07-14 tracey 		switch (imsg.hdr.type) {
641 a596b957 2022-07-14 tracey 		case IMSG_CTL_VERBOSE:
642 a596b957 2022-07-14 tracey 			log_info("%s", __func__);
643 a596b957 2022-07-14 tracey 			IMSG_SIZE_CHECK(&imsg, &verbose);
644 a596b957 2022-07-14 tracey 			memcpy(&verbose, imsg.data, sizeof(verbose));
645 a596b957 2022-07-14 tracey 			log_setverbose(verbose);
646 a596b957 2022-07-14 tracey 			break;
647 a596b957 2022-07-14 tracey 		case IMSG_CTL_PROCFD:
648 a596b957 2022-07-14 tracey 			IMSG_SIZE_CHECK(&imsg, &pf);
649 a596b957 2022-07-14 tracey 			memcpy(&pf, imsg.data, sizeof(pf));
650 a596b957 2022-07-14 tracey 			proc_accept(ps, imsg.fd, pf.pf_procid,
651 a596b957 2022-07-14 tracey 			    pf.pf_instance);
652 a596b957 2022-07-14 tracey 			break;
653 a596b957 2022-07-14 tracey 		default:
654 a596b957 2022-07-14 tracey 			log_warnx("%s: %s %d got invalid imsg %d peerid %d "
655 a596b957 2022-07-14 tracey 			    "from %s %d",
656 a596b957 2022-07-14 tracey 			    __func__, title, ps->ps_instance + 1,
657 a596b957 2022-07-14 tracey 			    imsg.hdr.type, imsg.hdr.peerid,
658 a596b957 2022-07-14 tracey 			    p->p_title, imsg.hdr.pid);
659 a596b957 2022-07-14 tracey 		}
660 a596b957 2022-07-14 tracey 		imsg_free(&imsg);
661 a596b957 2022-07-14 tracey 	}
662 a596b957 2022-07-14 tracey 	imsg_event_add(iev);
663 a596b957 2022-07-14 tracey }
664 a596b957 2022-07-14 tracey 
665 a596b957 2022-07-14 tracey int
666 a596b957 2022-07-14 tracey proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
667 a596b957 2022-07-14 tracey {
668 a596b957 2022-07-14 tracey 	return (-1);
669 a596b957 2022-07-14 tracey }
670 a596b957 2022-07-14 tracey 
671 a596b957 2022-07-14 tracey /*
672 a596b957 2022-07-14 tracey  * imsg helper functions
673 a596b957 2022-07-14 tracey  */
674 a596b957 2022-07-14 tracey 
675 a596b957 2022-07-14 tracey void
676 a596b957 2022-07-14 tracey imsg_event_add(struct imsgev *iev)
677 a596b957 2022-07-14 tracey {
678 a596b957 2022-07-14 tracey 	if (iev->handler == NULL) {
679 a596b957 2022-07-14 tracey 		imsg_flush(&iev->ibuf);
680 a596b957 2022-07-14 tracey 		return;
681 a596b957 2022-07-14 tracey 	}
682 a596b957 2022-07-14 tracey 
683 a596b957 2022-07-14 tracey 	iev->events = EV_READ;
684 a596b957 2022-07-14 tracey 	if (iev->ibuf.w.queued)
685 a596b957 2022-07-14 tracey 		iev->events |= EV_WRITE;
686 a596b957 2022-07-14 tracey 
687 a596b957 2022-07-14 tracey 	event_del(&iev->ev);
688 a596b957 2022-07-14 tracey 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
689 a596b957 2022-07-14 tracey 	event_add(&iev->ev, NULL);
690 a596b957 2022-07-14 tracey }
691 a596b957 2022-07-14 tracey 
692 a596b957 2022-07-14 tracey int
693 a596b957 2022-07-14 tracey imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
694 a596b957 2022-07-14 tracey     pid_t pid, int fd, void *data, uint16_t datalen)
695 a596b957 2022-07-14 tracey {
696 a596b957 2022-07-14 tracey 	int ret;
697 a596b957 2022-07-14 tracey 
698 a596b957 2022-07-14 tracey 	ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen);
699 a596b957 2022-07-14 tracey 	if (ret == -1)
700 a596b957 2022-07-14 tracey 		return (ret);
701 a596b957 2022-07-14 tracey 	imsg_event_add(iev);
702 a596b957 2022-07-14 tracey 	return (ret);
703 a596b957 2022-07-14 tracey }
704 a596b957 2022-07-14 tracey 
705 a596b957 2022-07-14 tracey int
706 a596b957 2022-07-14 tracey imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
707 a596b957 2022-07-14 tracey     pid_t pid, int fd, const struct iovec *iov, int iovcnt)
708 a596b957 2022-07-14 tracey {
709 a596b957 2022-07-14 tracey 	int ret;
710 a596b957 2022-07-14 tracey 
711 a596b957 2022-07-14 tracey 	ret = imsg_composev(&iev->ibuf, type, peerid, pid, fd, iov, iovcnt);
712 a596b957 2022-07-14 tracey 	if (ret == -1)
713 a596b957 2022-07-14 tracey 		return (ret);
714 a596b957 2022-07-14 tracey 	imsg_event_add(iev);
715 a596b957 2022-07-14 tracey 	return (ret);
716 a596b957 2022-07-14 tracey }
717 a596b957 2022-07-14 tracey 
718 a596b957 2022-07-14 tracey void
719 a596b957 2022-07-14 tracey proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
720 a596b957 2022-07-14 tracey {
721 a596b957 2022-07-14 tracey 	if (*n == -1) {
722 a596b957 2022-07-14 tracey 		/* Use a range of all target instances */
723 a596b957 2022-07-14 tracey 		*n = 0;
724 a596b957 2022-07-14 tracey 		*m = ps->ps_instances[id];
725 a596b957 2022-07-14 tracey 	} else {
726 a596b957 2022-07-14 tracey 		/* Use only a single slot of the specified peer process */
727 a596b957 2022-07-14 tracey 		*m = *n + 1;
728 a596b957 2022-07-14 tracey 	}
729 a596b957 2022-07-14 tracey }
730 a596b957 2022-07-14 tracey 
731 a596b957 2022-07-14 tracey int
732 a596b957 2022-07-14 tracey proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
733 a596b957 2022-07-14 tracey     uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
734 a596b957 2022-07-14 tracey {
735 a596b957 2022-07-14 tracey 	int m;
736 a596b957 2022-07-14 tracey 
737 a596b957 2022-07-14 tracey 	proc_range(ps, id, &n, &m);
738 a596b957 2022-07-14 tracey 	for (; n < m; n++) {
739 a596b957 2022-07-14 tracey 		if (imsg_compose_event(&ps->ps_ievs[id][n],
740 a596b957 2022-07-14 tracey 		    type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
741 a596b957 2022-07-14 tracey 			return (-1);
742 a596b957 2022-07-14 tracey 	}
743 a596b957 2022-07-14 tracey 
744 a596b957 2022-07-14 tracey 	return (0);
745 a596b957 2022-07-14 tracey }
746 a596b957 2022-07-14 tracey 
747 a596b957 2022-07-14 tracey int
748 a596b957 2022-07-14 tracey proc_compose(struct privsep *ps, enum privsep_procid id,
749 a596b957 2022-07-14 tracey     uint16_t type, void *data, uint16_t datalen)
750 a596b957 2022-07-14 tracey {
751 a596b957 2022-07-14 tracey 	return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
752 a596b957 2022-07-14 tracey }
753 a596b957 2022-07-14 tracey 
754 a596b957 2022-07-14 tracey int
755 a596b957 2022-07-14 tracey proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
756 a596b957 2022-07-14 tracey     uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
757 a596b957 2022-07-14 tracey {
758 a596b957 2022-07-14 tracey 	int m;
759 a596b957 2022-07-14 tracey 
760 a596b957 2022-07-14 tracey 	proc_range(ps, id, &n, &m);
761 a596b957 2022-07-14 tracey 	for (; n < m; n++)
762 a596b957 2022-07-14 tracey 		if (imsg_composev_event(&ps->ps_ievs[id][n],
763 a596b957 2022-07-14 tracey 		    type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
764 a596b957 2022-07-14 tracey 			return (-1);
765 a596b957 2022-07-14 tracey 
766 a596b957 2022-07-14 tracey 	return (0);
767 a596b957 2022-07-14 tracey }
768 a596b957 2022-07-14 tracey 
769 a596b957 2022-07-14 tracey int
770 a596b957 2022-07-14 tracey proc_composev(struct privsep *ps, enum privsep_procid id,
771 a596b957 2022-07-14 tracey     uint16_t type, const struct iovec *iov, int iovcnt)
772 a596b957 2022-07-14 tracey {
773 a596b957 2022-07-14 tracey 	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
774 a596b957 2022-07-14 tracey }
775 a596b957 2022-07-14 tracey 
776 a596b957 2022-07-14 tracey int
777 a596b957 2022-07-14 tracey proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
778 a596b957 2022-07-14 tracey     enum privsep_procid id, int n)
779 a596b957 2022-07-14 tracey {
780 a596b957 2022-07-14 tracey 	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
781 a596b957 2022-07-14 tracey 	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
782 a596b957 2022-07-14 tracey }
783 a596b957 2022-07-14 tracey 
784 a596b957 2022-07-14 tracey struct imsgbuf *
785 a596b957 2022-07-14 tracey proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
786 a596b957 2022-07-14 tracey {
787 a596b957 2022-07-14 tracey 	int m;
788 a596b957 2022-07-14 tracey 
789 a596b957 2022-07-14 tracey 	proc_range(ps, id, &n, &m);
790 a596b957 2022-07-14 tracey 	return (&ps->ps_ievs[id][n].ibuf);
791 a596b957 2022-07-14 tracey }
792 a596b957 2022-07-14 tracey 
793 a596b957 2022-07-14 tracey struct imsgev *
794 a596b957 2022-07-14 tracey proc_iev(struct privsep *ps, enum privsep_procid id, int n)
795 a596b957 2022-07-14 tracey {
796 a596b957 2022-07-14 tracey 	int m;
797 a596b957 2022-07-14 tracey 
798 a596b957 2022-07-14 tracey 	proc_range(ps, id, &n, &m);
799 a596b957 2022-07-14 tracey 	return (&ps->ps_ievs[id][n]);
800 a596b957 2022-07-14 tracey }
801 a596b957 2022-07-14 tracey 
802 a596b957 2022-07-14 tracey /* This function should only be called with care as it breaks async I/O */
803 a596b957 2022-07-14 tracey int
804 a596b957 2022-07-14 tracey proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
805 a596b957 2022-07-14 tracey {
806 a596b957 2022-07-14 tracey 	struct imsgbuf *ibuf;
807 a596b957 2022-07-14 tracey 	int m, ret = 0;
808 a596b957 2022-07-14 tracey 
809 a596b957 2022-07-14 tracey 	proc_range(ps, id, &n, &m);
810 a596b957 2022-07-14 tracey 	for (; n < m; n++) {
811 a596b957 2022-07-14 tracey 		ibuf = proc_ibuf(ps, id, n);
812 a596b957 2022-07-14 tracey 		if (ibuf == NULL)
813 a596b957 2022-07-14 tracey 			return (-1);
814 a596b957 2022-07-14 tracey 		do {
815 a596b957 2022-07-14 tracey 			ret = imsg_flush(ibuf);
816 a596b957 2022-07-14 tracey 		} while (ret == -1 && errno == EAGAIN);
817 a596b957 2022-07-14 tracey 		if (ret == -1)
818 a596b957 2022-07-14 tracey 			break;
819 a596b957 2022-07-14 tracey 		imsg_event_add(&ps->ps_ievs[id][n]);
820 a596b957 2022-07-14 tracey 	}
821 a596b957 2022-07-14 tracey 
822 a596b957 2022-07-14 tracey 	return (ret);
823 a596b957 2022-07-14 tracey }