1 b0a6bcf7 2022-09-13 op /*	$OpenBSD: proc.c,v 1.41 2021/12/04 06:52:58 florian Exp $	*/
  2 b0a6bcf7 2022-09-13 op 
  3 b0a6bcf7 2022-09-13 op /*
  4 b0a6bcf7 2022-09-13 op  * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
  5 b0a6bcf7 2022-09-13 op  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
  6 b0a6bcf7 2022-09-13 op  *
  7 b0a6bcf7 2022-09-13 op  * Permission to use, copy, modify, and distribute this software for any
  8 b0a6bcf7 2022-09-13 op  * purpose with or without fee is hereby granted, provided that the above
  9 b0a6bcf7 2022-09-13 op  * copyright notice and this permission notice appear in all copies.
 10 b0a6bcf7 2022-09-13 op  *
 11 b0a6bcf7 2022-09-13 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 12 b0a6bcf7 2022-09-13 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 13 b0a6bcf7 2022-09-13 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 14 b0a6bcf7 2022-09-13 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 15 b0a6bcf7 2022-09-13 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 16 b0a6bcf7 2022-09-13 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 17 b0a6bcf7 2022-09-13 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 18 b0a6bcf7 2022-09-13 op  */
 19 b0a6bcf7 2022-09-13 op 
 20 b0a6bcf7 2022-09-13 op #include <sys/types.h>
 21 b0a6bcf7 2022-09-13 op #include <sys/queue.h>
 22 b0a6bcf7 2022-09-13 op #include <sys/tree.h>
 23 b0a6bcf7 2022-09-13 op #include <sys/socket.h>
 24 b0a6bcf7 2022-09-13 op #include <sys/wait.h>
 25 b0a6bcf7 2022-09-13 op 
 26 b0a6bcf7 2022-09-13 op #include <fcntl.h>
 27 b0a6bcf7 2022-09-13 op #include <limits.h>
 28 b0a6bcf7 2022-09-13 op #include <stdio.h>
 29 b0a6bcf7 2022-09-13 op #include <stdlib.h>
 30 b0a6bcf7 2022-09-13 op #include <unistd.h>
 31 b0a6bcf7 2022-09-13 op #include <string.h>
 32 b0a6bcf7 2022-09-13 op #include <errno.h>
 33 b0a6bcf7 2022-09-13 op #include <signal.h>
 34 b0a6bcf7 2022-09-13 op #include <paths.h>
 35 b0a6bcf7 2022-09-13 op #include <pwd.h>
 36 b0a6bcf7 2022-09-13 op #include <event.h>
 37 b0a6bcf7 2022-09-13 op #include <imsg.h>
 38 b0a6bcf7 2022-09-13 op 
 39 b0a6bcf7 2022-09-13 op #include "log.h"
 40 b0a6bcf7 2022-09-13 op #include "proc.h"
 41 b0a6bcf7 2022-09-13 op 
 42 b0a6bcf7 2022-09-13 op #include "galileo.h"
 43 b0a6bcf7 2022-09-13 op 
 44 b0a6bcf7 2022-09-13 op void	 proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int,
 45 b0a6bcf7 2022-09-13 op 	    int, char **);
 46 b0a6bcf7 2022-09-13 op void	 proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
 47 b0a6bcf7 2022-09-13 op void	 proc_open(struct privsep *, int, int);
 48 b0a6bcf7 2022-09-13 op void	 proc_accept(struct privsep *, int, enum privsep_procid,
 49 b0a6bcf7 2022-09-13 op 	    unsigned int);
 50 b0a6bcf7 2022-09-13 op void	 proc_close(struct privsep *);
 51 b0a6bcf7 2022-09-13 op int	 proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
 52 b0a6bcf7 2022-09-13 op void	 proc_shutdown(struct privsep_proc *);
 53 b0a6bcf7 2022-09-13 op void	 proc_sig_handler(int, short, void *);
 54 b0a6bcf7 2022-09-13 op void	 proc_range(struct privsep *, enum privsep_procid, int *, int *);
 55 b0a6bcf7 2022-09-13 op int	 proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
 56 b0a6bcf7 2022-09-13 op 
 57 b0a6bcf7 2022-09-13 op int
 58 b0a6bcf7 2022-09-13 op proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
 59 b0a6bcf7 2022-09-13 op     enum privsep_procid type)
 60 b0a6bcf7 2022-09-13 op {
 61 b0a6bcf7 2022-09-13 op 	unsigned int	i;
 62 b0a6bcf7 2022-09-13 op 
 63 b0a6bcf7 2022-09-13 op 	for (i = 0; i < nproc; i++)
 64 b0a6bcf7 2022-09-13 op 		if (procs[i].p_id == type)
 65 b0a6bcf7 2022-09-13 op 			return (1);
 66 b0a6bcf7 2022-09-13 op 	return (0);
 67 b0a6bcf7 2022-09-13 op }
 68 b0a6bcf7 2022-09-13 op 
 69 b0a6bcf7 2022-09-13 op enum privsep_procid
 70 b0a6bcf7 2022-09-13 op proc_getid(struct privsep_proc *procs, unsigned int nproc,
 71 b0a6bcf7 2022-09-13 op     const char *proc_name)
 72 b0a6bcf7 2022-09-13 op {
 73 b0a6bcf7 2022-09-13 op 	struct privsep_proc	*p;
 74 b0a6bcf7 2022-09-13 op 	unsigned int		 proc;
 75 b0a6bcf7 2022-09-13 op 
 76 b0a6bcf7 2022-09-13 op 	for (proc = 0; proc < nproc; proc++) {
 77 b0a6bcf7 2022-09-13 op 		p = &procs[proc];
 78 b0a6bcf7 2022-09-13 op 		if (strcmp(p->p_title, proc_name))
 79 b0a6bcf7 2022-09-13 op 			continue;
 80 b0a6bcf7 2022-09-13 op 
 81 b0a6bcf7 2022-09-13 op 		return (p->p_id);
 82 b0a6bcf7 2022-09-13 op 	}
 83 b0a6bcf7 2022-09-13 op 
 84 b0a6bcf7 2022-09-13 op 	return (PROC_MAX);
 85 b0a6bcf7 2022-09-13 op }
 86 b0a6bcf7 2022-09-13 op 
 87 b0a6bcf7 2022-09-13 op void
 88 b0a6bcf7 2022-09-13 op proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
 89 b0a6bcf7 2022-09-13 op     int debug, int argc, char **argv)
 90 b0a6bcf7 2022-09-13 op {
 91 b0a6bcf7 2022-09-13 op 	unsigned int		 proc, nargc, i, proc_i;
 92 b0a6bcf7 2022-09-13 op 	char			**nargv;
 93 b0a6bcf7 2022-09-13 op 	struct privsep_proc	*p;
 94 b0a6bcf7 2022-09-13 op 	char			 num[32];
 95 b0a6bcf7 2022-09-13 op 	int			 fd;
 96 b0a6bcf7 2022-09-13 op 
 97 b0a6bcf7 2022-09-13 op 	/* Prepare the new process argv. */
 98 b0a6bcf7 2022-09-13 op 	nargv = calloc(argc + 5, sizeof(char *));
 99 b0a6bcf7 2022-09-13 op 	if (nargv == NULL)
100 b0a6bcf7 2022-09-13 op 		fatal("%s: calloc", __func__);
101 b0a6bcf7 2022-09-13 op 
102 b0a6bcf7 2022-09-13 op 	/* Copy call argument first. */
103 b0a6bcf7 2022-09-13 op 	nargc = 0;
104 b0a6bcf7 2022-09-13 op 	nargv[nargc++] = argv[0];
105 b0a6bcf7 2022-09-13 op 
106 b0a6bcf7 2022-09-13 op 	/* Set process name argument and save the position. */
107 b0a6bcf7 2022-09-13 op 	nargv[nargc++] = "-P";
108 b0a6bcf7 2022-09-13 op 	proc_i = nargc;
109 b0a6bcf7 2022-09-13 op 	nargc++;
110 b0a6bcf7 2022-09-13 op 
111 b0a6bcf7 2022-09-13 op 	/* Point process instance arg to stack and copy the original args. */
112 b0a6bcf7 2022-09-13 op 	nargv[nargc++] = "-I";
113 b0a6bcf7 2022-09-13 op 	nargv[nargc++] = num;
114 b0a6bcf7 2022-09-13 op 	for (i = 1; i < (unsigned int) argc; i++)
115 b0a6bcf7 2022-09-13 op 		nargv[nargc++] = argv[i];
116 b0a6bcf7 2022-09-13 op 
117 b0a6bcf7 2022-09-13 op 	nargv[nargc] = NULL;
118 b0a6bcf7 2022-09-13 op 
119 b0a6bcf7 2022-09-13 op 	for (proc = 0; proc < nproc; proc++) {
120 b0a6bcf7 2022-09-13 op 		p = &procs[proc];
121 b0a6bcf7 2022-09-13 op 
122 b0a6bcf7 2022-09-13 op 		/* Update args with process title. */
123 b0a6bcf7 2022-09-13 op 		nargv[proc_i] = (char *)(uintptr_t)p->p_title;
124 b0a6bcf7 2022-09-13 op 
125 b0a6bcf7 2022-09-13 op 		/* Fire children processes. */
126 b0a6bcf7 2022-09-13 op 		for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
127 b0a6bcf7 2022-09-13 op 			/* Update the process instance number. */
128 b0a6bcf7 2022-09-13 op 			snprintf(num, sizeof(num), "%u", i);
129 b0a6bcf7 2022-09-13 op 
130 b0a6bcf7 2022-09-13 op 			fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0];
131 b0a6bcf7 2022-09-13 op 			ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1;
132 b0a6bcf7 2022-09-13 op 
133 b0a6bcf7 2022-09-13 op 			switch (fork()) {
134 b0a6bcf7 2022-09-13 op 			case -1:
135 b0a6bcf7 2022-09-13 op 				fatal("%s: fork", __func__);
136 b0a6bcf7 2022-09-13 op 				break;
137 b0a6bcf7 2022-09-13 op 			case 0:
138 b0a6bcf7 2022-09-13 op 				/* First create a new session */
139 b0a6bcf7 2022-09-13 op 				if (setsid() == -1)
140 b0a6bcf7 2022-09-13 op 					fatal("setsid");
141 b0a6bcf7 2022-09-13 op 
142 b0a6bcf7 2022-09-13 op 				/* Prepare parent socket. */
143 b0a6bcf7 2022-09-13 op 				if (fd != PROC_PARENT_SOCK_FILENO) {
144 b0a6bcf7 2022-09-13 op 					if (dup2(fd, PROC_PARENT_SOCK_FILENO)
145 b0a6bcf7 2022-09-13 op 					    == -1)
146 b0a6bcf7 2022-09-13 op 						fatal("dup2");
147 b0a6bcf7 2022-09-13 op 				} else if (fcntl(fd, F_SETFD, 0) == -1)
148 b0a6bcf7 2022-09-13 op 					fatal("fcntl");
149 b0a6bcf7 2022-09-13 op 
150 b0a6bcf7 2022-09-13 op 				/* Daemons detach from terminal. */
151 b0a6bcf7 2022-09-13 op 				if (!debug && (fd =
152 b0a6bcf7 2022-09-13 op 				    open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
153 b0a6bcf7 2022-09-13 op 					(void)dup2(fd, STDIN_FILENO);
154 b0a6bcf7 2022-09-13 op 					(void)dup2(fd, STDOUT_FILENO);
155 b0a6bcf7 2022-09-13 op 					(void)dup2(fd, STDERR_FILENO);
156 b0a6bcf7 2022-09-13 op 					if (fd > 2)
157 b0a6bcf7 2022-09-13 op 						(void)close(fd);
158 b0a6bcf7 2022-09-13 op 				}
159 b0a6bcf7 2022-09-13 op 
160 b0a6bcf7 2022-09-13 op 				execvp(argv[0], nargv);
161 b0a6bcf7 2022-09-13 op 				fatal("%s: execvp", __func__);
162 b0a6bcf7 2022-09-13 op 				break;
163 b0a6bcf7 2022-09-13 op 			default:
164 b0a6bcf7 2022-09-13 op 				/* Close child end. */
165 b0a6bcf7 2022-09-13 op 				close(fd);
166 b0a6bcf7 2022-09-13 op 				break;
167 b0a6bcf7 2022-09-13 op 			}
168 b0a6bcf7 2022-09-13 op 		}
169 b0a6bcf7 2022-09-13 op 	}
170 b0a6bcf7 2022-09-13 op 	free(nargv);
171 b0a6bcf7 2022-09-13 op }
172 b0a6bcf7 2022-09-13 op 
173 b0a6bcf7 2022-09-13 op void
174 b0a6bcf7 2022-09-13 op proc_connect(struct privsep *ps)
175 b0a6bcf7 2022-09-13 op {
176 b0a6bcf7 2022-09-13 op 	struct imsgev		*iev;
177 b0a6bcf7 2022-09-13 op 	unsigned int		 src, dst, inst;
178 b0a6bcf7 2022-09-13 op 
179 b0a6bcf7 2022-09-13 op 	/* Don't distribute any sockets if we are not really going to run. */
180 b0a6bcf7 2022-09-13 op 	if (ps->ps_noaction)
181 b0a6bcf7 2022-09-13 op 		return;
182 b0a6bcf7 2022-09-13 op 
183 b0a6bcf7 2022-09-13 op 	for (dst = 0; dst < PROC_MAX; dst++) {
184 b0a6bcf7 2022-09-13 op 		/* We don't communicate with ourselves. */
185 b0a6bcf7 2022-09-13 op 		if (dst == PROC_PARENT)
186 b0a6bcf7 2022-09-13 op 			continue;
187 b0a6bcf7 2022-09-13 op 
188 b0a6bcf7 2022-09-13 op 		for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
189 b0a6bcf7 2022-09-13 op 			iev = &ps->ps_ievs[dst][inst];
190 b0a6bcf7 2022-09-13 op 			imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
191 b0a6bcf7 2022-09-13 op 			event_set(&iev->ev, iev->ibuf.fd, iev->events,
192 b0a6bcf7 2022-09-13 op 			    iev->handler, iev->data);
193 b0a6bcf7 2022-09-13 op 			event_add(&iev->ev, NULL);
194 b0a6bcf7 2022-09-13 op 		}
195 b0a6bcf7 2022-09-13 op 	}
196 b0a6bcf7 2022-09-13 op 
197 b0a6bcf7 2022-09-13 op 	/* Distribute the socketpair()s for everyone. */
198 b0a6bcf7 2022-09-13 op 	for (src = 0; src < PROC_MAX; src++)
199 b0a6bcf7 2022-09-13 op 		for (dst = src; dst < PROC_MAX; dst++) {
200 b0a6bcf7 2022-09-13 op 			/* Parent already distributed its fds. */
201 b0a6bcf7 2022-09-13 op 			if (src == PROC_PARENT || dst == PROC_PARENT)
202 b0a6bcf7 2022-09-13 op 				continue;
203 b0a6bcf7 2022-09-13 op 
204 b0a6bcf7 2022-09-13 op 			proc_open(ps, src, dst);
205 b0a6bcf7 2022-09-13 op 		}
206 b0a6bcf7 2022-09-13 op }
207 b0a6bcf7 2022-09-13 op 
208 b0a6bcf7 2022-09-13 op void
209 b0a6bcf7 2022-09-13 op proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
210 b0a6bcf7 2022-09-13 op     int debug, int argc, char **argv, enum privsep_procid proc_id)
211 b0a6bcf7 2022-09-13 op {
212 b0a6bcf7 2022-09-13 op 	struct privsep_proc	*p = NULL;
213 b0a6bcf7 2022-09-13 op 	struct privsep_pipes	*pa, *pb;
214 b0a6bcf7 2022-09-13 op 	unsigned int		 proc;
215 b0a6bcf7 2022-09-13 op 	unsigned int		 dst;
216 b0a6bcf7 2022-09-13 op 	int			 fds[2];
217 b0a6bcf7 2022-09-13 op 
218 b0a6bcf7 2022-09-13 op 	/* Don't initiate anything if we are not really going to run. */
219 b0a6bcf7 2022-09-13 op 	if (ps->ps_noaction)
220 b0a6bcf7 2022-09-13 op 		return;
221 b0a6bcf7 2022-09-13 op 
222 b0a6bcf7 2022-09-13 op 	if (proc_id == PROC_PARENT) {
223 b0a6bcf7 2022-09-13 op 		privsep_process = PROC_PARENT;
224 b0a6bcf7 2022-09-13 op 		proc_setup(ps, procs, nproc);
225 b0a6bcf7 2022-09-13 op 
226 b0a6bcf7 2022-09-13 op 		/*
227 b0a6bcf7 2022-09-13 op 		 * Create the children sockets so we can use them
228 b0a6bcf7 2022-09-13 op 		 * to distribute the rest of the socketpair()s using
229 b0a6bcf7 2022-09-13 op 		 * proc_connect() later.
230 b0a6bcf7 2022-09-13 op 		 */
231 b0a6bcf7 2022-09-13 op 		for (dst = 0; dst < PROC_MAX; dst++) {
232 b0a6bcf7 2022-09-13 op 			/* Don't create socket for ourselves. */
233 b0a6bcf7 2022-09-13 op 			if (dst == PROC_PARENT)
234 b0a6bcf7 2022-09-13 op 				continue;
235 b0a6bcf7 2022-09-13 op 
236 b0a6bcf7 2022-09-13 op 			for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
237 b0a6bcf7 2022-09-13 op 				pa = &ps->ps_pipes[PROC_PARENT][0];
238 b0a6bcf7 2022-09-13 op 				pb = &ps->ps_pipes[dst][proc];
239 b0a6bcf7 2022-09-13 op 				if (socketpair(AF_UNIX,
240 b0a6bcf7 2022-09-13 op 				    SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
241 b0a6bcf7 2022-09-13 op 				    PF_UNSPEC, fds) == -1)
242 b0a6bcf7 2022-09-13 op 					fatal("%s: socketpair", __func__);
243 b0a6bcf7 2022-09-13 op 
244 b0a6bcf7 2022-09-13 op 				pa->pp_pipes[dst][proc] = fds[0];
245 b0a6bcf7 2022-09-13 op 				pb->pp_pipes[PROC_PARENT][0] = fds[1];
246 b0a6bcf7 2022-09-13 op 			}
247 b0a6bcf7 2022-09-13 op 		}
248 b0a6bcf7 2022-09-13 op 
249 b0a6bcf7 2022-09-13 op 		/* Engage! */
250 b0a6bcf7 2022-09-13 op 		proc_exec(ps, procs, nproc, debug, argc, argv);
251 b0a6bcf7 2022-09-13 op 		return;
252 b0a6bcf7 2022-09-13 op 	}
253 b0a6bcf7 2022-09-13 op 
254 b0a6bcf7 2022-09-13 op 	/* Initialize a child */
255 b0a6bcf7 2022-09-13 op 	for (proc = 0; proc < nproc; proc++) {
256 b0a6bcf7 2022-09-13 op 		if (procs[proc].p_id != proc_id)
257 b0a6bcf7 2022-09-13 op 			continue;
258 b0a6bcf7 2022-09-13 op 		p = &procs[proc];
259 b0a6bcf7 2022-09-13 op 		break;
260 b0a6bcf7 2022-09-13 op 	}
261 b0a6bcf7 2022-09-13 op 	if (p == NULL || p->p_init == NULL)
262 b0a6bcf7 2022-09-13 op 		fatalx("%s: process %d missing process initialization",
263 b0a6bcf7 2022-09-13 op 		    __func__, proc_id);
264 b0a6bcf7 2022-09-13 op 
265 b0a6bcf7 2022-09-13 op 	p->p_init(ps, p);
266 b0a6bcf7 2022-09-13 op 
267 b0a6bcf7 2022-09-13 op 	fatalx("failed to initiate child process");
268 b0a6bcf7 2022-09-13 op }
269 b0a6bcf7 2022-09-13 op 
270 b0a6bcf7 2022-09-13 op void
271 b0a6bcf7 2022-09-13 op proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
272 b0a6bcf7 2022-09-13 op     unsigned int n)
273 b0a6bcf7 2022-09-13 op {
274 b0a6bcf7 2022-09-13 op 	struct privsep_pipes	*pp = ps->ps_pp;
275 b0a6bcf7 2022-09-13 op 	struct imsgev		*iev;
276 b0a6bcf7 2022-09-13 op 
277 b0a6bcf7 2022-09-13 op 	if (ps->ps_ievs[dst] == NULL) {
278 b0a6bcf7 2022-09-13 op #if DEBUG > 1
279 b0a6bcf7 2022-09-13 op 		log_debug("%s: %s src %d %d to dst %d %d not connected",
280 b0a6bcf7 2022-09-13 op 		    __func__, ps->ps_title[privsep_process],
281 b0a6bcf7 2022-09-13 op 		    privsep_process, ps->ps_instance + 1,
282 b0a6bcf7 2022-09-13 op 		    dst, n + 1);
283 b0a6bcf7 2022-09-13 op #endif
284 b0a6bcf7 2022-09-13 op 		close(fd);
285 b0a6bcf7 2022-09-13 op 		return;
286 b0a6bcf7 2022-09-13 op 	}
287 b0a6bcf7 2022-09-13 op 
288 b0a6bcf7 2022-09-13 op 	if (pp->pp_pipes[dst][n] != -1) {
289 b0a6bcf7 2022-09-13 op 		log_warnx("%s: duplicated descriptor", __func__);
290 b0a6bcf7 2022-09-13 op 		close(fd);
291 b0a6bcf7 2022-09-13 op 		return;
292 b0a6bcf7 2022-09-13 op 	} else
293 b0a6bcf7 2022-09-13 op 		pp->pp_pipes[dst][n] = fd;
294 b0a6bcf7 2022-09-13 op 
295 b0a6bcf7 2022-09-13 op 	iev = &ps->ps_ievs[dst][n];
296 b0a6bcf7 2022-09-13 op 	imsg_init(&iev->ibuf, fd);
297 b0a6bcf7 2022-09-13 op 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
298 b0a6bcf7 2022-09-13 op 	event_add(&iev->ev, NULL);
299 b0a6bcf7 2022-09-13 op }
300 b0a6bcf7 2022-09-13 op 
301 b0a6bcf7 2022-09-13 op void
302 b0a6bcf7 2022-09-13 op proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
303 b0a6bcf7 2022-09-13 op {
304 b0a6bcf7 2022-09-13 op 	unsigned int		 i, j, src, dst, id;
305 b0a6bcf7 2022-09-13 op 	struct privsep_pipes	*pp;
306 b0a6bcf7 2022-09-13 op 
307 b0a6bcf7 2022-09-13 op 	/* Initialize parent title, ps_instances and procs. */
308 b0a6bcf7 2022-09-13 op 	ps->ps_title[PROC_PARENT] = "parent";
309 b0a6bcf7 2022-09-13 op 
310 b0a6bcf7 2022-09-13 op 	for (src = 0; src < PROC_MAX; src++)
311 b0a6bcf7 2022-09-13 op 		/* Default to 1 process instance */
312 b0a6bcf7 2022-09-13 op 		if (ps->ps_instances[src] < 1)
313 b0a6bcf7 2022-09-13 op 			ps->ps_instances[src] = 1;
314 b0a6bcf7 2022-09-13 op 
315 b0a6bcf7 2022-09-13 op 	for (src = 0; src < nproc; src++) {
316 b0a6bcf7 2022-09-13 op 		procs[src].p_ps = ps;
317 b0a6bcf7 2022-09-13 op 		if (procs[src].p_cb == NULL)
318 b0a6bcf7 2022-09-13 op 			procs[src].p_cb = proc_dispatch_null;
319 b0a6bcf7 2022-09-13 op 
320 b0a6bcf7 2022-09-13 op 		id = procs[src].p_id;
321 b0a6bcf7 2022-09-13 op 		ps->ps_title[id] = procs[src].p_title;
322 b0a6bcf7 2022-09-13 op 		if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id],
323 b0a6bcf7 2022-09-13 op 		    sizeof(struct imsgev))) == NULL)
324 b0a6bcf7 2022-09-13 op 			fatal("%s: calloc", __func__);
325 b0a6bcf7 2022-09-13 op 
326 b0a6bcf7 2022-09-13 op 		/* With this set up, we are ready to call imsg_init(). */
327 b0a6bcf7 2022-09-13 op 		for (i = 0; i < ps->ps_instances[id]; i++) {
328 b0a6bcf7 2022-09-13 op 			ps->ps_ievs[id][i].handler = proc_dispatch;
329 b0a6bcf7 2022-09-13 op 			ps->ps_ievs[id][i].events = EV_READ;
330 b0a6bcf7 2022-09-13 op 			ps->ps_ievs[id][i].proc = &procs[src];
331 b0a6bcf7 2022-09-13 op 			ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
332 b0a6bcf7 2022-09-13 op 		}
333 b0a6bcf7 2022-09-13 op 	}
334 b0a6bcf7 2022-09-13 op 
335 b0a6bcf7 2022-09-13 op 	/*
336 b0a6bcf7 2022-09-13 op 	 * Allocate pipes for all process instances (incl. parent)
337 b0a6bcf7 2022-09-13 op 	 *
338 b0a6bcf7 2022-09-13 op 	 * - ps->ps_pipes: N:M mapping
339 b0a6bcf7 2022-09-13 op 	 * N source processes connected to M destination processes:
340 b0a6bcf7 2022-09-13 op 	 * [src][instances][dst][instances], for example
341 b0a6bcf7 2022-09-13 op 	 * [PROC_RELAY][3][PROC_CA][3]
342 b0a6bcf7 2022-09-13 op 	 *
343 b0a6bcf7 2022-09-13 op 	 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
344 b0a6bcf7 2022-09-13 op 	 * Each process instance has a destination array of socketpair fds:
345 b0a6bcf7 2022-09-13 op 	 * [dst][instances], for example
346 b0a6bcf7 2022-09-13 op 	 * [PROC_PARENT][0]
347 b0a6bcf7 2022-09-13 op 	 */
348 b0a6bcf7 2022-09-13 op 	for (src = 0; src < PROC_MAX; src++) {
349 b0a6bcf7 2022-09-13 op 		/* Allocate destination array for each process */
350 b0a6bcf7 2022-09-13 op 		if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src],
351 b0a6bcf7 2022-09-13 op 		    sizeof(struct privsep_pipes))) == NULL)
352 b0a6bcf7 2022-09-13 op 			fatal("%s: calloc", __func__);
353 b0a6bcf7 2022-09-13 op 
354 b0a6bcf7 2022-09-13 op 		for (i = 0; i < ps->ps_instances[src]; i++) {
355 b0a6bcf7 2022-09-13 op 			pp = &ps->ps_pipes[src][i];
356 b0a6bcf7 2022-09-13 op 
357 b0a6bcf7 2022-09-13 op 			for (dst = 0; dst < PROC_MAX; dst++) {
358 b0a6bcf7 2022-09-13 op 				/* Allocate maximum fd integers */
359 b0a6bcf7 2022-09-13 op 				if ((pp->pp_pipes[dst] =
360 b0a6bcf7 2022-09-13 op 				    calloc(ps->ps_instances[dst],
361 b0a6bcf7 2022-09-13 op 				    sizeof(int))) == NULL)
362 b0a6bcf7 2022-09-13 op 					fatal("%s: calloc", __func__);
363 b0a6bcf7 2022-09-13 op 
364 b0a6bcf7 2022-09-13 op 				/* Mark fd as unused */
365 b0a6bcf7 2022-09-13 op 				for (j = 0; j < ps->ps_instances[dst]; j++)
366 b0a6bcf7 2022-09-13 op 					pp->pp_pipes[dst][j] = -1;
367 b0a6bcf7 2022-09-13 op 			}
368 b0a6bcf7 2022-09-13 op 		}
369 b0a6bcf7 2022-09-13 op 	}
370 b0a6bcf7 2022-09-13 op 
371 b0a6bcf7 2022-09-13 op 	ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
372 b0a6bcf7 2022-09-13 op }
373 b0a6bcf7 2022-09-13 op 
374 b0a6bcf7 2022-09-13 op void
375 b0a6bcf7 2022-09-13 op proc_kill(struct privsep *ps)
376 b0a6bcf7 2022-09-13 op {
377 b0a6bcf7 2022-09-13 op 	char		*cause;
378 b0a6bcf7 2022-09-13 op 	pid_t		 pid;
379 b0a6bcf7 2022-09-13 op 	int		 len, status;
380 b0a6bcf7 2022-09-13 op 
381 b0a6bcf7 2022-09-13 op 	if (privsep_process != PROC_PARENT)
382 b0a6bcf7 2022-09-13 op 		return;
383 b0a6bcf7 2022-09-13 op 
384 b0a6bcf7 2022-09-13 op 	proc_close(ps);
385 b0a6bcf7 2022-09-13 op 
386 b0a6bcf7 2022-09-13 op 	do {
387 b0a6bcf7 2022-09-13 op 		pid = waitpid(WAIT_ANY, &status, 0);
388 b0a6bcf7 2022-09-13 op 		if (pid <= 0)
389 b0a6bcf7 2022-09-13 op 			continue;
390 b0a6bcf7 2022-09-13 op 
391 b0a6bcf7 2022-09-13 op 		if (WIFSIGNALED(status)) {
392 b0a6bcf7 2022-09-13 op 			len = asprintf(&cause, "terminated; signal %d",
393 b0a6bcf7 2022-09-13 op 			    WTERMSIG(status));
394 b0a6bcf7 2022-09-13 op 		} else if (WIFEXITED(status)) {
395 b0a6bcf7 2022-09-13 op 			if (WEXITSTATUS(status) != 0)
396 b0a6bcf7 2022-09-13 op 				len = asprintf(&cause, "exited abnormally");
397 b0a6bcf7 2022-09-13 op 			else
398 b0a6bcf7 2022-09-13 op 				len = 0;
399 b0a6bcf7 2022-09-13 op 		} else
400 b0a6bcf7 2022-09-13 op 			len = -1;
401 b0a6bcf7 2022-09-13 op 
402 b0a6bcf7 2022-09-13 op 		if (len == 0) {
403 b0a6bcf7 2022-09-13 op 			/* child exited OK, don't print a warning message */
404 b0a6bcf7 2022-09-13 op 		} else if (len != -1) {
405 b0a6bcf7 2022-09-13 op 			log_warnx("lost child: pid %u %s", pid, cause);
406 b0a6bcf7 2022-09-13 op 			free(cause);
407 b0a6bcf7 2022-09-13 op 		} else
408 b0a6bcf7 2022-09-13 op 			log_warnx("lost child: pid %u", pid);
409 b0a6bcf7 2022-09-13 op 	} while (pid != -1 || errno == EINTR);
410 b0a6bcf7 2022-09-13 op }
411 b0a6bcf7 2022-09-13 op 
412 b0a6bcf7 2022-09-13 op void
413 b0a6bcf7 2022-09-13 op proc_open(struct privsep *ps, int src, int dst)
414 b0a6bcf7 2022-09-13 op {
415 b0a6bcf7 2022-09-13 op 	struct privsep_pipes	*pa, *pb;
416 b0a6bcf7 2022-09-13 op 	struct privsep_fd	 pf;
417 b0a6bcf7 2022-09-13 op 	int			 fds[2];
418 b0a6bcf7 2022-09-13 op 	unsigned int		 i, j;
419 b0a6bcf7 2022-09-13 op 
420 b0a6bcf7 2022-09-13 op 	/* Exchange pipes between process. */
421 b0a6bcf7 2022-09-13 op 	for (i = 0; i < ps->ps_instances[src]; i++) {
422 b0a6bcf7 2022-09-13 op 		for (j = 0; j < ps->ps_instances[dst]; j++) {
423 b0a6bcf7 2022-09-13 op 			/* Don't create sockets for ourself. */
424 b0a6bcf7 2022-09-13 op 			if (src == dst && i == j)
425 b0a6bcf7 2022-09-13 op 				continue;
426 b0a6bcf7 2022-09-13 op 
427 b0a6bcf7 2022-09-13 op 			/* Proxies don't talk to each other. */
428 b0a6bcf7 2022-09-13 op 			if (src == PROC_PROXY && dst == PROC_PROXY)
429 b0a6bcf7 2022-09-13 op 				continue;
430 b0a6bcf7 2022-09-13 op 
431 b0a6bcf7 2022-09-13 op 			pa = &ps->ps_pipes[src][i];
432 b0a6bcf7 2022-09-13 op 			pb = &ps->ps_pipes[dst][j];
433 b0a6bcf7 2022-09-13 op 			if (socketpair(AF_UNIX,
434 b0a6bcf7 2022-09-13 op 			    SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
435 b0a6bcf7 2022-09-13 op 			    PF_UNSPEC, fds) == -1)
436 b0a6bcf7 2022-09-13 op 				fatal("%s: socketpair", __func__);
437 b0a6bcf7 2022-09-13 op 
438 b0a6bcf7 2022-09-13 op 			pa->pp_pipes[dst][j] = fds[0];
439 b0a6bcf7 2022-09-13 op 			pb->pp_pipes[src][i] = fds[1];
440 b0a6bcf7 2022-09-13 op 
441 b0a6bcf7 2022-09-13 op 			pf.pf_procid = src;
442 b0a6bcf7 2022-09-13 op 			pf.pf_instance = i;
443 b0a6bcf7 2022-09-13 op 			if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
444 b0a6bcf7 2022-09-13 op 			    -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
445 b0a6bcf7 2022-09-13 op 				fatal("%s: proc_compose_imsg", __func__);
446 b0a6bcf7 2022-09-13 op 
447 b0a6bcf7 2022-09-13 op 			pf.pf_procid = dst;
448 b0a6bcf7 2022-09-13 op 			pf.pf_instance = j;
449 b0a6bcf7 2022-09-13 op 			if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
450 b0a6bcf7 2022-09-13 op 			    -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
451 b0a6bcf7 2022-09-13 op 				fatal("%s: proc_compose_imsg", __func__);
452 b0a6bcf7 2022-09-13 op 
453 b0a6bcf7 2022-09-13 op 			/*
454 b0a6bcf7 2022-09-13 op 			 * We have to flush to send the descriptors and close
455 b0a6bcf7 2022-09-13 op 			 * them to avoid the fd ramp on startup.
456 b0a6bcf7 2022-09-13 op 			 */
457 b0a6bcf7 2022-09-13 op 			if (proc_flush_imsg(ps, src, i) == -1 ||
458 b0a6bcf7 2022-09-13 op 			    proc_flush_imsg(ps, dst, j) == -1)
459 b0a6bcf7 2022-09-13 op 				fatal("%s: imsg_flush", __func__);
460 b0a6bcf7 2022-09-13 op 		}
461 b0a6bcf7 2022-09-13 op 	}
462 b0a6bcf7 2022-09-13 op }
463 b0a6bcf7 2022-09-13 op 
464 b0a6bcf7 2022-09-13 op void
465 b0a6bcf7 2022-09-13 op proc_close(struct privsep *ps)
466 b0a6bcf7 2022-09-13 op {
467 b0a6bcf7 2022-09-13 op 	unsigned int		 dst, n;
468 b0a6bcf7 2022-09-13 op 	struct privsep_pipes	*pp;
469 b0a6bcf7 2022-09-13 op 
470 b0a6bcf7 2022-09-13 op 	if (ps == NULL)
471 b0a6bcf7 2022-09-13 op 		return;
472 b0a6bcf7 2022-09-13 op 
473 b0a6bcf7 2022-09-13 op 	pp = ps->ps_pp;
474 b0a6bcf7 2022-09-13 op 
475 b0a6bcf7 2022-09-13 op 	for (dst = 0; dst < PROC_MAX; dst++) {
476 b0a6bcf7 2022-09-13 op 		if (ps->ps_ievs[dst] == NULL)
477 b0a6bcf7 2022-09-13 op 			continue;
478 b0a6bcf7 2022-09-13 op 
479 b0a6bcf7 2022-09-13 op 		for (n = 0; n < ps->ps_instances[dst]; n++) {
480 b0a6bcf7 2022-09-13 op 			if (pp->pp_pipes[dst][n] == -1)
481 b0a6bcf7 2022-09-13 op 				continue;
482 b0a6bcf7 2022-09-13 op 
483 b0a6bcf7 2022-09-13 op 			/* Cancel the fd, close and invalidate the fd */
484 b0a6bcf7 2022-09-13 op 			event_del(&(ps->ps_ievs[dst][n].ev));
485 b0a6bcf7 2022-09-13 op 			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
486 b0a6bcf7 2022-09-13 op 			close(pp->pp_pipes[dst][n]);
487 b0a6bcf7 2022-09-13 op 			pp->pp_pipes[dst][n] = -1;
488 b0a6bcf7 2022-09-13 op 		}
489 b0a6bcf7 2022-09-13 op 		free(ps->ps_ievs[dst]);
490 b0a6bcf7 2022-09-13 op 	}
491 b0a6bcf7 2022-09-13 op }
492 b0a6bcf7 2022-09-13 op 
493 b0a6bcf7 2022-09-13 op void
494 b0a6bcf7 2022-09-13 op proc_shutdown(struct privsep_proc *p)
495 b0a6bcf7 2022-09-13 op {
496 b0a6bcf7 2022-09-13 op 	struct privsep	*ps = p->p_ps;
497 b0a6bcf7 2022-09-13 op 
498 b0a6bcf7 2022-09-13 op 	if (p->p_shutdown != NULL)
499 b0a6bcf7 2022-09-13 op 		(*p->p_shutdown)();
500 b0a6bcf7 2022-09-13 op 
501 b0a6bcf7 2022-09-13 op 	proc_close(ps);
502 b0a6bcf7 2022-09-13 op 
503 b0a6bcf7 2022-09-13 op 	log_info("%s exiting, pid %d", p->p_title, getpid());
504 b0a6bcf7 2022-09-13 op 
505 b0a6bcf7 2022-09-13 op 	exit(0);
506 b0a6bcf7 2022-09-13 op }
507 b0a6bcf7 2022-09-13 op 
508 b0a6bcf7 2022-09-13 op void
509 b0a6bcf7 2022-09-13 op proc_sig_handler(int sig, short event, void *arg)
510 b0a6bcf7 2022-09-13 op {
511 b0a6bcf7 2022-09-13 op 	struct privsep_proc	*p = arg;
512 b0a6bcf7 2022-09-13 op 
513 b0a6bcf7 2022-09-13 op 	switch (sig) {
514 b0a6bcf7 2022-09-13 op 	case SIGINT:
515 b0a6bcf7 2022-09-13 op 	case SIGTERM:
516 b0a6bcf7 2022-09-13 op 		proc_shutdown(p);
517 b0a6bcf7 2022-09-13 op 		break;
518 b0a6bcf7 2022-09-13 op 	case SIGCHLD:
519 b0a6bcf7 2022-09-13 op 	case SIGHUP:
520 b0a6bcf7 2022-09-13 op 		/* ignore */
521 b0a6bcf7 2022-09-13 op 		break;
522 b0a6bcf7 2022-09-13 op 	default:
523 b0a6bcf7 2022-09-13 op 		fatalx("%s: unexpected signal", __func__);
524 b0a6bcf7 2022-09-13 op 		/* NOTREACHED */
525 b0a6bcf7 2022-09-13 op 	}
526 b0a6bcf7 2022-09-13 op }
527 b0a6bcf7 2022-09-13 op 
528 b0a6bcf7 2022-09-13 op void
529 b0a6bcf7 2022-09-13 op proc_run(struct privsep *ps, struct privsep_proc *p,
530 b0a6bcf7 2022-09-13 op     struct privsep_proc *procs, unsigned int nproc,
531 b0a6bcf7 2022-09-13 op     void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
532 b0a6bcf7 2022-09-13 op {
533 b0a6bcf7 2022-09-13 op 	struct passwd		*pw;
534 b0a6bcf7 2022-09-13 op 	const char		*root;
535 b0a6bcf7 2022-09-13 op 
536 b0a6bcf7 2022-09-13 op 	log_procinit(p->p_title);
537 b0a6bcf7 2022-09-13 op 
538 b0a6bcf7 2022-09-13 op 	/* Set the process group of the current process */
539 b0a6bcf7 2022-09-13 op 	setpgid(0, 0);
540 b0a6bcf7 2022-09-13 op 
541 b0a6bcf7 2022-09-13 op 	/* Use non-standard user */
542 b0a6bcf7 2022-09-13 op 	if (p->p_pw != NULL)
543 b0a6bcf7 2022-09-13 op 		pw = p->p_pw;
544 b0a6bcf7 2022-09-13 op 	else
545 b0a6bcf7 2022-09-13 op 		pw = ps->ps_pw;
546 b0a6bcf7 2022-09-13 op 
547 b0a6bcf7 2022-09-13 op 	/* Change root directory */
548 b0a6bcf7 2022-09-13 op 	if (p->p_chroot != NULL)
549 b0a6bcf7 2022-09-13 op 		root = p->p_chroot;
550 b0a6bcf7 2022-09-13 op 	else
551 b0a6bcf7 2022-09-13 op 		root = pw->pw_dir;
552 b0a6bcf7 2022-09-13 op 
553 b0a6bcf7 2022-09-13 op 	if (chroot(root) == -1)
554 b0a6bcf7 2022-09-13 op 		fatal("%s: chroot", __func__);
555 b0a6bcf7 2022-09-13 op 	if (chdir("/") == -1)
556 b0a6bcf7 2022-09-13 op 		fatal("%s: chdir(\"/\")", __func__);
557 b0a6bcf7 2022-09-13 op 
558 b0a6bcf7 2022-09-13 op 	privsep_process = p->p_id;
559 b0a6bcf7 2022-09-13 op 
560 b0a6bcf7 2022-09-13 op 	setproctitle("%s", p->p_title);
561 b0a6bcf7 2022-09-13 op 
562 b0a6bcf7 2022-09-13 op 	if (setgroups(1, &pw->pw_gid) ||
563 b0a6bcf7 2022-09-13 op 	    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
564 b0a6bcf7 2022-09-13 op 	    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
565 b0a6bcf7 2022-09-13 op 		fatal("%s: cannot drop privileges", __func__);
566 b0a6bcf7 2022-09-13 op 
567 b0a6bcf7 2022-09-13 op 	event_init();
568 b0a6bcf7 2022-09-13 op 
569 b0a6bcf7 2022-09-13 op 	signal(SIGPIPE, SIG_IGN);
570 b0a6bcf7 2022-09-13 op 
571 b0a6bcf7 2022-09-13 op 	signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
572 b0a6bcf7 2022-09-13 op 	signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
573 b0a6bcf7 2022-09-13 op 	signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
574 b0a6bcf7 2022-09-13 op 	signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
575 b0a6bcf7 2022-09-13 op 
576 b0a6bcf7 2022-09-13 op 	signal_add(&ps->ps_evsigint, NULL);
577 b0a6bcf7 2022-09-13 op 	signal_add(&ps->ps_evsigterm, NULL);
578 b0a6bcf7 2022-09-13 op 	signal_add(&ps->ps_evsigchld, NULL);
579 b0a6bcf7 2022-09-13 op 	signal_add(&ps->ps_evsighup, NULL);
580 b0a6bcf7 2022-09-13 op 
581 b0a6bcf7 2022-09-13 op 	proc_setup(ps, procs, nproc);
582 b0a6bcf7 2022-09-13 op 	proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0);
583 b0a6bcf7 2022-09-13 op 
584 b0a6bcf7 2022-09-13 op 	log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
585 b0a6bcf7 2022-09-13 op 	    ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
586 b0a6bcf7 2022-09-13 op 
587 b0a6bcf7 2022-09-13 op 	if (run != NULL)
588 b0a6bcf7 2022-09-13 op 		run(ps, p, arg);
589 b0a6bcf7 2022-09-13 op 
590 b0a6bcf7 2022-09-13 op 	event_dispatch();
591 b0a6bcf7 2022-09-13 op 
592 b0a6bcf7 2022-09-13 op 	proc_shutdown(p);
593 b0a6bcf7 2022-09-13 op }
594 b0a6bcf7 2022-09-13 op 
595 b0a6bcf7 2022-09-13 op void
596 b0a6bcf7 2022-09-13 op proc_dispatch(int fd, short event, void *arg)
597 b0a6bcf7 2022-09-13 op {
598 b0a6bcf7 2022-09-13 op 	struct imsgev		*iev = arg;
599 b0a6bcf7 2022-09-13 op 	struct privsep_proc	*p = iev->proc;
600 b0a6bcf7 2022-09-13 op 	struct privsep		*ps = p->p_ps;
601 b0a6bcf7 2022-09-13 op 	struct imsgbuf		*ibuf;
602 b0a6bcf7 2022-09-13 op 	struct imsg		 imsg;
603 b0a6bcf7 2022-09-13 op 	ssize_t			 n;
604 b0a6bcf7 2022-09-13 op 	const char		*title;
605 b0a6bcf7 2022-09-13 op 	struct privsep_fd	 pf;
606 b0a6bcf7 2022-09-13 op 
607 b0a6bcf7 2022-09-13 op 	title = ps->ps_title[privsep_process];
608 b0a6bcf7 2022-09-13 op 	ibuf = &iev->ibuf;
609 b0a6bcf7 2022-09-13 op 
610 b0a6bcf7 2022-09-13 op 	if (event & EV_READ) {
611 b0a6bcf7 2022-09-13 op 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
612 b0a6bcf7 2022-09-13 op 			fatal("%s: imsg_read", __func__);
613 b0a6bcf7 2022-09-13 op 		if (n == 0) {
614 b0a6bcf7 2022-09-13 op 			/* this pipe is dead, so remove the event handler */
615 b0a6bcf7 2022-09-13 op 			event_del(&iev->ev);
616 b0a6bcf7 2022-09-13 op 			event_loopexit(NULL);
617 b0a6bcf7 2022-09-13 op 			return;
618 b0a6bcf7 2022-09-13 op 		}
619 b0a6bcf7 2022-09-13 op 	}
620 b0a6bcf7 2022-09-13 op 
621 b0a6bcf7 2022-09-13 op 	if (event & EV_WRITE) {
622 b0a6bcf7 2022-09-13 op 		if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
623 b0a6bcf7 2022-09-13 op 			fatal("%s: msgbuf_write", __func__);
624 b0a6bcf7 2022-09-13 op 		if (n == 0) {
625 b0a6bcf7 2022-09-13 op 			/* this pipe is dead, so remove the event handler */
626 b0a6bcf7 2022-09-13 op 			event_del(&iev->ev);
627 b0a6bcf7 2022-09-13 op 			event_loopexit(NULL);
628 b0a6bcf7 2022-09-13 op 			return;
629 b0a6bcf7 2022-09-13 op 		}
630 b0a6bcf7 2022-09-13 op 	}
631 b0a6bcf7 2022-09-13 op 
632 b0a6bcf7 2022-09-13 op 	for (;;) {
633 b0a6bcf7 2022-09-13 op 		if ((n = imsg_get(ibuf, &imsg)) == -1)
634 b0a6bcf7 2022-09-13 op 			fatal("%s: imsg_get", __func__);
635 b0a6bcf7 2022-09-13 op 		if (n == 0)
636 b0a6bcf7 2022-09-13 op 			break;
637 b0a6bcf7 2022-09-13 op 
638 b0a6bcf7 2022-09-13 op #if DEBUG > 1
639 b0a6bcf7 2022-09-13 op 		log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
640 b0a6bcf7 2022-09-13 op 		    __func__, title, ps->ps_instance + 1,
641 b0a6bcf7 2022-09-13 op 		    imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
642 b0a6bcf7 2022-09-13 op #endif
643 b0a6bcf7 2022-09-13 op 
644 b0a6bcf7 2022-09-13 op 		/*
645 b0a6bcf7 2022-09-13 op 		 * Check the message with the program callback
646 b0a6bcf7 2022-09-13 op 		 */
647 b0a6bcf7 2022-09-13 op 		if ((p->p_cb)(fd, p, &imsg) == 0) {
648 b0a6bcf7 2022-09-13 op 			/* Message was handled by the callback, continue */
649 b0a6bcf7 2022-09-13 op 			imsg_free(&imsg);
650 b0a6bcf7 2022-09-13 op 			continue;
651 b0a6bcf7 2022-09-13 op 		}
652 b0a6bcf7 2022-09-13 op 
653 b0a6bcf7 2022-09-13 op 		/*
654 b0a6bcf7 2022-09-13 op 		 * Generic message handling
655 b0a6bcf7 2022-09-13 op 		 */
656 b0a6bcf7 2022-09-13 op 		switch (imsg.hdr.type) {
657 b0a6bcf7 2022-09-13 op 		case IMSG_CTL_PROCFD:
658 b0a6bcf7 2022-09-13 op 			IMSG_SIZE_CHECK(&imsg, &pf);
659 b0a6bcf7 2022-09-13 op 			memcpy(&pf, imsg.data, sizeof(pf));
660 b0a6bcf7 2022-09-13 op 			proc_accept(ps, imsg.fd, pf.pf_procid,
661 b0a6bcf7 2022-09-13 op 			    pf.pf_instance);
662 b0a6bcf7 2022-09-13 op 			break;
663 b0a6bcf7 2022-09-13 op 		default:
664 b0a6bcf7 2022-09-13 op 			fatalx("%s: %s %d got invalid imsg %d peerid %d "
665 b0a6bcf7 2022-09-13 op 			    "from %s %d",
666 b0a6bcf7 2022-09-13 op 			    __func__, title, ps->ps_instance + 1,
667 b0a6bcf7 2022-09-13 op 			    imsg.hdr.type, imsg.hdr.peerid,
668 b0a6bcf7 2022-09-13 op 			    p->p_title, imsg.hdr.pid);
669 b0a6bcf7 2022-09-13 op 		}
670 b0a6bcf7 2022-09-13 op 		imsg_free(&imsg);
671 b0a6bcf7 2022-09-13 op 	}
672 b0a6bcf7 2022-09-13 op 	imsg_event_add(iev);
673 b0a6bcf7 2022-09-13 op }
674 b0a6bcf7 2022-09-13 op 
675 b0a6bcf7 2022-09-13 op int
676 b0a6bcf7 2022-09-13 op proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
677 b0a6bcf7 2022-09-13 op {
678 b0a6bcf7 2022-09-13 op 	return (-1);
679 b0a6bcf7 2022-09-13 op }
680 b0a6bcf7 2022-09-13 op 
681 b0a6bcf7 2022-09-13 op /*
682 b0a6bcf7 2022-09-13 op  * imsg helper functions
683 b0a6bcf7 2022-09-13 op  */
684 b0a6bcf7 2022-09-13 op 
685 b0a6bcf7 2022-09-13 op void
686 b0a6bcf7 2022-09-13 op imsg_event_add(struct imsgev *iev)
687 b0a6bcf7 2022-09-13 op {
688 b0a6bcf7 2022-09-13 op 	if (iev->handler == NULL) {
689 b0a6bcf7 2022-09-13 op 		imsg_flush(&iev->ibuf);
690 b0a6bcf7 2022-09-13 op 		return;
691 b0a6bcf7 2022-09-13 op 	}
692 b0a6bcf7 2022-09-13 op 
693 b0a6bcf7 2022-09-13 op 	iev->events = EV_READ;
694 b0a6bcf7 2022-09-13 op 	if (iev->ibuf.w.queued)
695 b0a6bcf7 2022-09-13 op 		iev->events |= EV_WRITE;
696 b0a6bcf7 2022-09-13 op 
697 b0a6bcf7 2022-09-13 op 	event_del(&iev->ev);
698 b0a6bcf7 2022-09-13 op 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
699 b0a6bcf7 2022-09-13 op 	event_add(&iev->ev, NULL);
700 b0a6bcf7 2022-09-13 op }
701 b0a6bcf7 2022-09-13 op 
702 b0a6bcf7 2022-09-13 op int
703 b0a6bcf7 2022-09-13 op imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
704 b0a6bcf7 2022-09-13 op     pid_t pid, int fd, void *data, uint16_t datalen)
705 b0a6bcf7 2022-09-13 op {
706 b0a6bcf7 2022-09-13 op 	int	ret;
707 b0a6bcf7 2022-09-13 op 
708 b0a6bcf7 2022-09-13 op 	if ((ret = imsg_compose(&iev->ibuf, type, peerid,
709 b0a6bcf7 2022-09-13 op 	    pid, fd, data, datalen)) == -1)
710 b0a6bcf7 2022-09-13 op 		return (ret);
711 b0a6bcf7 2022-09-13 op 	imsg_event_add(iev);
712 b0a6bcf7 2022-09-13 op 	return (ret);
713 b0a6bcf7 2022-09-13 op }
714 b0a6bcf7 2022-09-13 op 
715 b0a6bcf7 2022-09-13 op int
716 b0a6bcf7 2022-09-13 op imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
717 b0a6bcf7 2022-09-13 op     pid_t pid, int fd, const struct iovec *iov, int iovcnt)
718 b0a6bcf7 2022-09-13 op {
719 b0a6bcf7 2022-09-13 op 	int	ret;
720 b0a6bcf7 2022-09-13 op 
721 b0a6bcf7 2022-09-13 op 	if ((ret = imsg_composev(&iev->ibuf, type, peerid,
722 b0a6bcf7 2022-09-13 op 	    pid, fd, iov, iovcnt)) == -1)
723 b0a6bcf7 2022-09-13 op 		return (ret);
724 b0a6bcf7 2022-09-13 op 	imsg_event_add(iev);
725 b0a6bcf7 2022-09-13 op 	return (ret);
726 b0a6bcf7 2022-09-13 op }
727 b0a6bcf7 2022-09-13 op 
728 b0a6bcf7 2022-09-13 op void
729 b0a6bcf7 2022-09-13 op proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
730 b0a6bcf7 2022-09-13 op {
731 b0a6bcf7 2022-09-13 op 	if (*n == -1) {
732 b0a6bcf7 2022-09-13 op 		/* Use a range of all target instances */
733 b0a6bcf7 2022-09-13 op 		*n = 0;
734 b0a6bcf7 2022-09-13 op 		*m = ps->ps_instances[id];
735 b0a6bcf7 2022-09-13 op 	} else {
736 b0a6bcf7 2022-09-13 op 		/* Use only a single slot of the specified peer process */
737 b0a6bcf7 2022-09-13 op 		*m = *n + 1;
738 b0a6bcf7 2022-09-13 op 	}
739 b0a6bcf7 2022-09-13 op }
740 b0a6bcf7 2022-09-13 op 
741 b0a6bcf7 2022-09-13 op int
742 b0a6bcf7 2022-09-13 op proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
743 b0a6bcf7 2022-09-13 op     uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
744 b0a6bcf7 2022-09-13 op {
745 b0a6bcf7 2022-09-13 op 	int	 m;
746 b0a6bcf7 2022-09-13 op 
747 b0a6bcf7 2022-09-13 op 	proc_range(ps, id, &n, &m);
748 b0a6bcf7 2022-09-13 op 	for (; n < m; n++) {
749 b0a6bcf7 2022-09-13 op 		if (imsg_compose_event(&ps->ps_ievs[id][n],
750 b0a6bcf7 2022-09-13 op 		    type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
751 b0a6bcf7 2022-09-13 op 			return (-1);
752 b0a6bcf7 2022-09-13 op 	}
753 b0a6bcf7 2022-09-13 op 
754 b0a6bcf7 2022-09-13 op 	return (0);
755 b0a6bcf7 2022-09-13 op }
756 b0a6bcf7 2022-09-13 op 
757 b0a6bcf7 2022-09-13 op int
758 b0a6bcf7 2022-09-13 op proc_compose(struct privsep *ps, enum privsep_procid id,
759 b0a6bcf7 2022-09-13 op     uint16_t type, void *data, uint16_t datalen)
760 b0a6bcf7 2022-09-13 op {
761 b0a6bcf7 2022-09-13 op 	return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
762 b0a6bcf7 2022-09-13 op }
763 b0a6bcf7 2022-09-13 op 
764 b0a6bcf7 2022-09-13 op int
765 b0a6bcf7 2022-09-13 op proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
766 b0a6bcf7 2022-09-13 op     uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
767 b0a6bcf7 2022-09-13 op {
768 b0a6bcf7 2022-09-13 op 	int	 m;
769 b0a6bcf7 2022-09-13 op 
770 b0a6bcf7 2022-09-13 op 	proc_range(ps, id, &n, &m);
771 b0a6bcf7 2022-09-13 op 	for (; n < m; n++)
772 b0a6bcf7 2022-09-13 op 		if (imsg_composev_event(&ps->ps_ievs[id][n],
773 b0a6bcf7 2022-09-13 op 		    type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
774 b0a6bcf7 2022-09-13 op 			return (-1);
775 b0a6bcf7 2022-09-13 op 
776 b0a6bcf7 2022-09-13 op 	return (0);
777 b0a6bcf7 2022-09-13 op }
778 b0a6bcf7 2022-09-13 op 
779 b0a6bcf7 2022-09-13 op int
780 b0a6bcf7 2022-09-13 op proc_composev(struct privsep *ps, enum privsep_procid id,
781 b0a6bcf7 2022-09-13 op     uint16_t type, const struct iovec *iov, int iovcnt)
782 b0a6bcf7 2022-09-13 op {
783 b0a6bcf7 2022-09-13 op 	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
784 b0a6bcf7 2022-09-13 op }
785 b0a6bcf7 2022-09-13 op 
786 b0a6bcf7 2022-09-13 op int
787 b0a6bcf7 2022-09-13 op proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
788 b0a6bcf7 2022-09-13 op     enum privsep_procid id, int n)
789 b0a6bcf7 2022-09-13 op {
790 b0a6bcf7 2022-09-13 op 	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
791 b0a6bcf7 2022-09-13 op 	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
792 b0a6bcf7 2022-09-13 op }
793 b0a6bcf7 2022-09-13 op 
794 b0a6bcf7 2022-09-13 op struct imsgbuf *
795 b0a6bcf7 2022-09-13 op proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
796 b0a6bcf7 2022-09-13 op {
797 b0a6bcf7 2022-09-13 op 	int	 m;
798 b0a6bcf7 2022-09-13 op 
799 b0a6bcf7 2022-09-13 op 	proc_range(ps, id, &n, &m);
800 b0a6bcf7 2022-09-13 op 	return (&ps->ps_ievs[id][n].ibuf);
801 b0a6bcf7 2022-09-13 op }
802 b0a6bcf7 2022-09-13 op 
803 b0a6bcf7 2022-09-13 op struct imsgev *
804 b0a6bcf7 2022-09-13 op proc_iev(struct privsep *ps, enum privsep_procid id, int n)
805 b0a6bcf7 2022-09-13 op {
806 b0a6bcf7 2022-09-13 op 	int	 m;
807 b0a6bcf7 2022-09-13 op 
808 b0a6bcf7 2022-09-13 op 	proc_range(ps, id, &n, &m);
809 b0a6bcf7 2022-09-13 op 	return (&ps->ps_ievs[id][n]);
810 b0a6bcf7 2022-09-13 op }
811 b0a6bcf7 2022-09-13 op 
812 b0a6bcf7 2022-09-13 op /* This function should only be called with care as it breaks async I/O */
813 b0a6bcf7 2022-09-13 op int
814 b0a6bcf7 2022-09-13 op proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
815 b0a6bcf7 2022-09-13 op {
816 b0a6bcf7 2022-09-13 op 	struct imsgbuf	*ibuf;
817 b0a6bcf7 2022-09-13 op 	int		 m, ret = 0;
818 b0a6bcf7 2022-09-13 op 
819 b0a6bcf7 2022-09-13 op 	proc_range(ps, id, &n, &m);
820 b0a6bcf7 2022-09-13 op 	for (; n < m; n++) {
821 b0a6bcf7 2022-09-13 op 		if ((ibuf = proc_ibuf(ps, id, n)) == NULL)
822 b0a6bcf7 2022-09-13 op 			return (-1);
823 b0a6bcf7 2022-09-13 op 		do {
824 b0a6bcf7 2022-09-13 op 			ret = imsg_flush(ibuf);
825 b0a6bcf7 2022-09-13 op 		} while (ret == -1 && errno == EAGAIN);
826 b0a6bcf7 2022-09-13 op 		if (ret == -1)
827 b0a6bcf7 2022-09-13 op 			break;
828 b0a6bcf7 2022-09-13 op 		imsg_event_add(&ps->ps_ievs[id][n]);
829 b0a6bcf7 2022-09-13 op 	}
830 b0a6bcf7 2022-09-13 op 
831 b0a6bcf7 2022-09-13 op 	return (ret);
832 b0a6bcf7 2022-09-13 op }