1 3ef3f36a 2023-07-05 op /*	$OpenBSD: imsg.c,v 1.19 2023/06/19 17:19:50 claudio Exp $	*/
  2 dd038bc6 2021-09-21 thomas.ad 
  3 dd038bc6 2021-09-21 thomas.ad /*
  4 dd038bc6 2021-09-21 thomas.ad  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
  5 dd038bc6 2021-09-21 thomas.ad  *
  6 dd038bc6 2021-09-21 thomas.ad  * Permission to use, copy, modify, and distribute this software for any
  7 dd038bc6 2021-09-21 thomas.ad  * purpose with or without fee is hereby granted, provided that the above
  8 dd038bc6 2021-09-21 thomas.ad  * copyright notice and this permission notice appear in all copies.
  9 dd038bc6 2021-09-21 thomas.ad  *
 10 dd038bc6 2021-09-21 thomas.ad  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11 dd038bc6 2021-09-21 thomas.ad  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12 dd038bc6 2021-09-21 thomas.ad  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13 dd038bc6 2021-09-21 thomas.ad  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14 dd038bc6 2021-09-21 thomas.ad  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15 dd038bc6 2021-09-21 thomas.ad  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16 dd038bc6 2021-09-21 thomas.ad  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17 dd038bc6 2021-09-21 thomas.ad  */
 18 dd038bc6 2021-09-21 thomas.ad 
 19 dd038bc6 2021-09-21 thomas.ad #include <sys/types.h>
 20 dd038bc6 2021-09-21 thomas.ad #include <sys/socket.h>
 21 dd038bc6 2021-09-21 thomas.ad #include <sys/uio.h>
 22 dd038bc6 2021-09-21 thomas.ad 
 23 dd038bc6 2021-09-21 thomas.ad #include <errno.h>
 24 dd038bc6 2021-09-21 thomas.ad #include <stdlib.h>
 25 dd038bc6 2021-09-21 thomas.ad #include <string.h>
 26 dd038bc6 2021-09-21 thomas.ad #include <unistd.h>
 27 dd038bc6 2021-09-21 thomas.ad 
 28 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 29 dd038bc6 2021-09-21 thomas.ad #include "imsg.h"
 30 dd038bc6 2021-09-21 thomas.ad 
 31 dd038bc6 2021-09-21 thomas.ad int	 imsg_fd_overhead = 0;
 32 dd038bc6 2021-09-21 thomas.ad 
 33 dd038bc6 2021-09-21 thomas.ad static int	 imsg_get_fd(struct imsgbuf *);
 34 dd038bc6 2021-09-21 thomas.ad 
 35 dd038bc6 2021-09-21 thomas.ad void
 36 dd038bc6 2021-09-21 thomas.ad imsg_init(struct imsgbuf *ibuf, int fd)
 37 dd038bc6 2021-09-21 thomas.ad {
 38 dd038bc6 2021-09-21 thomas.ad 	msgbuf_init(&ibuf->w);
 39 dd038bc6 2021-09-21 thomas.ad 	memset(&ibuf->r, 0, sizeof(ibuf->r));
 40 dd038bc6 2021-09-21 thomas.ad 	ibuf->fd = fd;
 41 dd038bc6 2021-09-21 thomas.ad 	ibuf->w.fd = fd;
 42 dd038bc6 2021-09-21 thomas.ad 	ibuf->pid = getpid();
 43 dd038bc6 2021-09-21 thomas.ad 	TAILQ_INIT(&ibuf->fds);
 44 dd038bc6 2021-09-21 thomas.ad }
 45 dd038bc6 2021-09-21 thomas.ad 
 46 dd038bc6 2021-09-21 thomas.ad ssize_t
 47 dd038bc6 2021-09-21 thomas.ad imsg_read(struct imsgbuf *ibuf)
 48 dd038bc6 2021-09-21 thomas.ad {
 49 dd038bc6 2021-09-21 thomas.ad 	struct msghdr		 msg;
 50 dd038bc6 2021-09-21 thomas.ad 	struct cmsghdr		*cmsg;
 51 dd038bc6 2021-09-21 thomas.ad 	union {
 52 dd038bc6 2021-09-21 thomas.ad 		struct cmsghdr hdr;
 53 dd038bc6 2021-09-21 thomas.ad 		char	buf[CMSG_SPACE(sizeof(int) * 1)];
 54 dd038bc6 2021-09-21 thomas.ad 	} cmsgbuf;
 55 dd038bc6 2021-09-21 thomas.ad 	struct iovec		 iov;
 56 dd038bc6 2021-09-21 thomas.ad 	ssize_t			 n = -1;
 57 dd038bc6 2021-09-21 thomas.ad 	int			 fd;
 58 dd038bc6 2021-09-21 thomas.ad 	struct imsg_fd		*ifd;
 59 dd038bc6 2021-09-21 thomas.ad 
 60 dd038bc6 2021-09-21 thomas.ad 	memset(&msg, 0, sizeof(msg));
 61 dd038bc6 2021-09-21 thomas.ad 	memset(&cmsgbuf, 0, sizeof(cmsgbuf));
 62 dd038bc6 2021-09-21 thomas.ad 
 63 dd038bc6 2021-09-21 thomas.ad 	iov.iov_base = ibuf->r.buf + ibuf->r.wpos;
 64 dd038bc6 2021-09-21 thomas.ad 	iov.iov_len = sizeof(ibuf->r.buf) - ibuf->r.wpos;
 65 dd038bc6 2021-09-21 thomas.ad 	msg.msg_iov = &iov;
 66 dd038bc6 2021-09-21 thomas.ad 	msg.msg_iovlen = 1;
 67 dd038bc6 2021-09-21 thomas.ad 	msg.msg_control = &cmsgbuf.buf;
 68 dd038bc6 2021-09-21 thomas.ad 	msg.msg_controllen = sizeof(cmsgbuf.buf);
 69 dd038bc6 2021-09-21 thomas.ad 
 70 dd038bc6 2021-09-21 thomas.ad 	if ((ifd = calloc(1, sizeof(struct imsg_fd))) == NULL)
 71 dd038bc6 2021-09-21 thomas.ad 		return (-1);
 72 dd038bc6 2021-09-21 thomas.ad 
 73 dd038bc6 2021-09-21 thomas.ad again:
 74 dd038bc6 2021-09-21 thomas.ad 	if (getdtablecount() + imsg_fd_overhead +
 75 dd038bc6 2021-09-21 thomas.ad 	    (int)((CMSG_SPACE(sizeof(int))-CMSG_SPACE(0))/sizeof(int))
 76 dd038bc6 2021-09-21 thomas.ad 	    >= getdtablesize()) {
 77 dd038bc6 2021-09-21 thomas.ad 		errno = EAGAIN;
 78 dd038bc6 2021-09-21 thomas.ad 		free(ifd);
 79 dd038bc6 2021-09-21 thomas.ad 		return (-1);
 80 dd038bc6 2021-09-21 thomas.ad 	}
 81 dd038bc6 2021-09-21 thomas.ad 
 82 dd038bc6 2021-09-21 thomas.ad 	if ((n = recvmsg(ibuf->fd, &msg, 0)) == -1) {
 83 dd038bc6 2021-09-21 thomas.ad 		if (errno == EINTR)
 84 dd038bc6 2021-09-21 thomas.ad 			goto again;
 85 dd038bc6 2021-09-21 thomas.ad 		goto fail;
 86 dd038bc6 2021-09-21 thomas.ad 	}
 87 dd038bc6 2021-09-21 thomas.ad 
 88 dd038bc6 2021-09-21 thomas.ad 	ibuf->r.wpos += n;
 89 dd038bc6 2021-09-21 thomas.ad 
 90 dd038bc6 2021-09-21 thomas.ad 	for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
 91 dd038bc6 2021-09-21 thomas.ad 	    cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 92 dd038bc6 2021-09-21 thomas.ad 		if (cmsg->cmsg_level == SOL_SOCKET &&
 93 dd038bc6 2021-09-21 thomas.ad 		    cmsg->cmsg_type == SCM_RIGHTS) {
 94 dd038bc6 2021-09-21 thomas.ad 			int i;
 95 dd038bc6 2021-09-21 thomas.ad 			int j;
 96 dd038bc6 2021-09-21 thomas.ad 
 97 dd038bc6 2021-09-21 thomas.ad 			/*
 98 dd038bc6 2021-09-21 thomas.ad 			 * We only accept one file descriptor.  Due to C
 99 dd038bc6 2021-09-21 thomas.ad 			 * padding rules, our control buffer might contain
100 dd038bc6 2021-09-21 thomas.ad 			 * more than one fd, and we must close them.
101 dd038bc6 2021-09-21 thomas.ad 			 */
102 dd038bc6 2021-09-21 thomas.ad 			j = ((char *)cmsg + cmsg->cmsg_len -
103 dd038bc6 2021-09-21 thomas.ad 			    (char *)CMSG_DATA(cmsg)) / sizeof(int);
104 dd038bc6 2021-09-21 thomas.ad 			for (i = 0; i < j; i++) {
105 dd038bc6 2021-09-21 thomas.ad 				fd = ((int *)CMSG_DATA(cmsg))[i];
106 dd038bc6 2021-09-21 thomas.ad 				if (ifd != NULL) {
107 dd038bc6 2021-09-21 thomas.ad 					ifd->fd = fd;
108 dd038bc6 2021-09-21 thomas.ad 					TAILQ_INSERT_TAIL(&ibuf->fds, ifd,
109 dd038bc6 2021-09-21 thomas.ad 					    entry);
110 dd038bc6 2021-09-21 thomas.ad 					ifd = NULL;
111 dd038bc6 2021-09-21 thomas.ad 				} else
112 dd038bc6 2021-09-21 thomas.ad 					close(fd);
113 dd038bc6 2021-09-21 thomas.ad 			}
114 dd038bc6 2021-09-21 thomas.ad 		}
115 dd038bc6 2021-09-21 thomas.ad 		/* we do not handle other ctl data level */
116 dd038bc6 2021-09-21 thomas.ad 	}
117 dd038bc6 2021-09-21 thomas.ad 
118 dd038bc6 2021-09-21 thomas.ad fail:
119 dd038bc6 2021-09-21 thomas.ad 	free(ifd);
120 dd038bc6 2021-09-21 thomas.ad 	return (n);
121 dd038bc6 2021-09-21 thomas.ad }
122 dd038bc6 2021-09-21 thomas.ad 
123 dd038bc6 2021-09-21 thomas.ad ssize_t
124 dd038bc6 2021-09-21 thomas.ad imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
125 dd038bc6 2021-09-21 thomas.ad {
126 dd038bc6 2021-09-21 thomas.ad 	size_t			 av, left, datalen;
127 dd038bc6 2021-09-21 thomas.ad 
128 dd038bc6 2021-09-21 thomas.ad 	av = ibuf->r.wpos;
129 dd038bc6 2021-09-21 thomas.ad 
130 dd038bc6 2021-09-21 thomas.ad 	if (IMSG_HEADER_SIZE > av)
131 dd038bc6 2021-09-21 thomas.ad 		return (0);
132 dd038bc6 2021-09-21 thomas.ad 
133 dd038bc6 2021-09-21 thomas.ad 	memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
134 dd038bc6 2021-09-21 thomas.ad 	if (imsg->hdr.len < IMSG_HEADER_SIZE ||
135 dd038bc6 2021-09-21 thomas.ad 	    imsg->hdr.len > MAX_IMSGSIZE) {
136 dd038bc6 2021-09-21 thomas.ad 		errno = ERANGE;
137 dd038bc6 2021-09-21 thomas.ad 		return (-1);
138 dd038bc6 2021-09-21 thomas.ad 	}
139 dd038bc6 2021-09-21 thomas.ad 	if (imsg->hdr.len > av)
140 dd038bc6 2021-09-21 thomas.ad 		return (0);
141 dd038bc6 2021-09-21 thomas.ad 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
142 dd038bc6 2021-09-21 thomas.ad 	ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
143 dd038bc6 2021-09-21 thomas.ad 	if (datalen == 0)
144 dd038bc6 2021-09-21 thomas.ad 		imsg->data = NULL;
145 dd038bc6 2021-09-21 thomas.ad 	else if ((imsg->data = malloc(datalen)) == NULL)
146 dd038bc6 2021-09-21 thomas.ad 		return (-1);
147 dd038bc6 2021-09-21 thomas.ad 
148 dd038bc6 2021-09-21 thomas.ad 	if (imsg->hdr.flags & IMSGF_HASFD)
149 dd038bc6 2021-09-21 thomas.ad 		imsg->fd = imsg_get_fd(ibuf);
150 dd038bc6 2021-09-21 thomas.ad 	else
151 dd038bc6 2021-09-21 thomas.ad 		imsg->fd = -1;
152 dd038bc6 2021-09-21 thomas.ad 
153 3ef3f36a 2023-07-05 op 	if (datalen != 0)
154 3ef3f36a 2023-07-05 op 		memcpy(imsg->data, ibuf->r.rptr, datalen);
155 dd038bc6 2021-09-21 thomas.ad 
156 dd038bc6 2021-09-21 thomas.ad 	if (imsg->hdr.len < av) {
157 dd038bc6 2021-09-21 thomas.ad 		left = av - imsg->hdr.len;
158 dd038bc6 2021-09-21 thomas.ad 		memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
159 dd038bc6 2021-09-21 thomas.ad 		ibuf->r.wpos = left;
160 dd038bc6 2021-09-21 thomas.ad 	} else
161 dd038bc6 2021-09-21 thomas.ad 		ibuf->r.wpos = 0;
162 dd038bc6 2021-09-21 thomas.ad 
163 dd038bc6 2021-09-21 thomas.ad 	return (datalen + IMSG_HEADER_SIZE);
164 dd038bc6 2021-09-21 thomas.ad }
165 dd038bc6 2021-09-21 thomas.ad 
166 dd038bc6 2021-09-21 thomas.ad int
167 dd038bc6 2021-09-21 thomas.ad imsg_compose(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
168 dd038bc6 2021-09-21 thomas.ad     int fd, const void *data, uint16_t datalen)
169 dd038bc6 2021-09-21 thomas.ad {
170 dd038bc6 2021-09-21 thomas.ad 	struct ibuf	*wbuf;
171 dd038bc6 2021-09-21 thomas.ad 
172 dd038bc6 2021-09-21 thomas.ad 	if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
173 dd038bc6 2021-09-21 thomas.ad 		return (-1);
174 dd038bc6 2021-09-21 thomas.ad 
175 dd038bc6 2021-09-21 thomas.ad 	if (imsg_add(wbuf, data, datalen) == -1)
176 dd038bc6 2021-09-21 thomas.ad 		return (-1);
177 dd038bc6 2021-09-21 thomas.ad 
178 3ef3f36a 2023-07-05 op 	ibuf_fd_set(wbuf, fd);
179 dd038bc6 2021-09-21 thomas.ad 	imsg_close(ibuf, wbuf);
180 dd038bc6 2021-09-21 thomas.ad 
181 dd038bc6 2021-09-21 thomas.ad 	return (1);
182 dd038bc6 2021-09-21 thomas.ad }
183 dd038bc6 2021-09-21 thomas.ad 
184 dd038bc6 2021-09-21 thomas.ad int
185 dd038bc6 2021-09-21 thomas.ad imsg_composev(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
186 dd038bc6 2021-09-21 thomas.ad     int fd, const struct iovec *iov, int iovcnt)
187 dd038bc6 2021-09-21 thomas.ad {
188 dd038bc6 2021-09-21 thomas.ad 	struct ibuf	*wbuf;
189 dd038bc6 2021-09-21 thomas.ad 	int		 i, datalen = 0;
190 dd038bc6 2021-09-21 thomas.ad 
191 dd038bc6 2021-09-21 thomas.ad 	for (i = 0; i < iovcnt; i++)
192 dd038bc6 2021-09-21 thomas.ad 		datalen += iov[i].iov_len;
193 dd038bc6 2021-09-21 thomas.ad 
194 dd038bc6 2021-09-21 thomas.ad 	if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
195 dd038bc6 2021-09-21 thomas.ad 		return (-1);
196 dd038bc6 2021-09-21 thomas.ad 
197 dd038bc6 2021-09-21 thomas.ad 	for (i = 0; i < iovcnt; i++)
198 dd038bc6 2021-09-21 thomas.ad 		if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1)
199 dd038bc6 2021-09-21 thomas.ad 			return (-1);
200 dd038bc6 2021-09-21 thomas.ad 
201 3ef3f36a 2023-07-05 op 	ibuf_fd_set(wbuf, fd);
202 dd038bc6 2021-09-21 thomas.ad 	imsg_close(ibuf, wbuf);
203 dd038bc6 2021-09-21 thomas.ad 
204 dd038bc6 2021-09-21 thomas.ad 	return (1);
205 dd038bc6 2021-09-21 thomas.ad }
206 dd038bc6 2021-09-21 thomas.ad 
207 3ef3f36a 2023-07-05 op int
208 3ef3f36a 2023-07-05 op imsg_compose_ibuf(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid,
209 3ef3f36a 2023-07-05 op     pid_t pid, struct ibuf *buf)
210 3ef3f36a 2023-07-05 op {
211 3ef3f36a 2023-07-05 op 	struct ibuf	*wbuf = NULL;
212 3ef3f36a 2023-07-05 op 	struct imsg_hdr	 hdr;
213 3ef3f36a 2023-07-05 op 	int save_errno;
214 3ef3f36a 2023-07-05 op 
215 3ef3f36a 2023-07-05 op 	if (ibuf_size(buf) + IMSG_HEADER_SIZE > MAX_IMSGSIZE) {
216 3ef3f36a 2023-07-05 op 		errno = ERANGE;
217 3ef3f36a 2023-07-05 op 		goto fail;
218 3ef3f36a 2023-07-05 op 	}
219 3ef3f36a 2023-07-05 op 
220 3ef3f36a 2023-07-05 op 	hdr.type = type;
221 3ef3f36a 2023-07-05 op 	hdr.len = ibuf_size(buf) + IMSG_HEADER_SIZE;
222 3ef3f36a 2023-07-05 op 	hdr.flags = 0;
223 3ef3f36a 2023-07-05 op 	hdr.peerid = peerid;
224 3ef3f36a 2023-07-05 op 	if ((hdr.pid = pid) == 0)
225 3ef3f36a 2023-07-05 op 		hdr.pid = ibuf->pid;
226 3ef3f36a 2023-07-05 op 
227 3ef3f36a 2023-07-05 op 	if ((wbuf = ibuf_open(IMSG_HEADER_SIZE)) == NULL)
228 3ef3f36a 2023-07-05 op 		goto fail;
229 3ef3f36a 2023-07-05 op 	if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
230 3ef3f36a 2023-07-05 op 		goto fail;
231 3ef3f36a 2023-07-05 op 
232 3ef3f36a 2023-07-05 op 	ibuf_close(&ibuf->w, wbuf);
233 3ef3f36a 2023-07-05 op 	ibuf_close(&ibuf->w, buf);
234 3ef3f36a 2023-07-05 op 	return (1);
235 3ef3f36a 2023-07-05 op 
236 3ef3f36a 2023-07-05 op  fail:
237 3ef3f36a 2023-07-05 op 	save_errno = errno;
238 3ef3f36a 2023-07-05 op 	ibuf_free(buf);
239 3ef3f36a 2023-07-05 op 	ibuf_free(wbuf);
240 3ef3f36a 2023-07-05 op 	errno = save_errno;
241 3ef3f36a 2023-07-05 op 	return (-1);
242 3ef3f36a 2023-07-05 op }
243 3ef3f36a 2023-07-05 op 
244 dd038bc6 2021-09-21 thomas.ad struct ibuf *
245 dd038bc6 2021-09-21 thomas.ad imsg_create(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
246 dd038bc6 2021-09-21 thomas.ad     uint16_t datalen)
247 dd038bc6 2021-09-21 thomas.ad {
248 dd038bc6 2021-09-21 thomas.ad 	struct ibuf	*wbuf;
249 dd038bc6 2021-09-21 thomas.ad 	struct imsg_hdr	 hdr;
250 dd038bc6 2021-09-21 thomas.ad 
251 dd038bc6 2021-09-21 thomas.ad 	datalen += IMSG_HEADER_SIZE;
252 dd038bc6 2021-09-21 thomas.ad 	if (datalen > MAX_IMSGSIZE) {
253 dd038bc6 2021-09-21 thomas.ad 		errno = ERANGE;
254 dd038bc6 2021-09-21 thomas.ad 		return (NULL);
255 dd038bc6 2021-09-21 thomas.ad 	}
256 dd038bc6 2021-09-21 thomas.ad 
257 dd038bc6 2021-09-21 thomas.ad 	hdr.type = type;
258 dd038bc6 2021-09-21 thomas.ad 	hdr.flags = 0;
259 dd038bc6 2021-09-21 thomas.ad 	hdr.peerid = peerid;
260 dd038bc6 2021-09-21 thomas.ad 	if ((hdr.pid = pid) == 0)
261 dd038bc6 2021-09-21 thomas.ad 		hdr.pid = ibuf->pid;
262 dd038bc6 2021-09-21 thomas.ad 	if ((wbuf = ibuf_dynamic(datalen, MAX_IMSGSIZE)) == NULL) {
263 dd038bc6 2021-09-21 thomas.ad 		return (NULL);
264 dd038bc6 2021-09-21 thomas.ad 	}
265 dd038bc6 2021-09-21 thomas.ad 	if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
266 dd038bc6 2021-09-21 thomas.ad 		return (NULL);
267 dd038bc6 2021-09-21 thomas.ad 
268 dd038bc6 2021-09-21 thomas.ad 	return (wbuf);
269 dd038bc6 2021-09-21 thomas.ad }
270 dd038bc6 2021-09-21 thomas.ad 
271 dd038bc6 2021-09-21 thomas.ad int
272 dd038bc6 2021-09-21 thomas.ad imsg_add(struct ibuf *msg, const void *data, uint16_t datalen)
273 dd038bc6 2021-09-21 thomas.ad {
274 dd038bc6 2021-09-21 thomas.ad 	if (datalen)
275 dd038bc6 2021-09-21 thomas.ad 		if (ibuf_add(msg, data, datalen) == -1) {
276 dd038bc6 2021-09-21 thomas.ad 			ibuf_free(msg);
277 dd038bc6 2021-09-21 thomas.ad 			return (-1);
278 dd038bc6 2021-09-21 thomas.ad 		}
279 dd038bc6 2021-09-21 thomas.ad 	return (datalen);
280 dd038bc6 2021-09-21 thomas.ad }
281 dd038bc6 2021-09-21 thomas.ad 
282 dd038bc6 2021-09-21 thomas.ad void
283 dd038bc6 2021-09-21 thomas.ad imsg_close(struct imsgbuf *ibuf, struct ibuf *msg)
284 dd038bc6 2021-09-21 thomas.ad {
285 dd038bc6 2021-09-21 thomas.ad 	struct imsg_hdr	*hdr;
286 dd038bc6 2021-09-21 thomas.ad 
287 dd038bc6 2021-09-21 thomas.ad 	hdr = (struct imsg_hdr *)msg->buf;
288 dd038bc6 2021-09-21 thomas.ad 
289 dd038bc6 2021-09-21 thomas.ad 	hdr->flags &= ~IMSGF_HASFD;
290 3ef3f36a 2023-07-05 op 	if (ibuf_fd_avail(msg))
291 dd038bc6 2021-09-21 thomas.ad 		hdr->flags |= IMSGF_HASFD;
292 3ef3f36a 2023-07-05 op 	hdr->len = ibuf_size(msg);
293 dd038bc6 2021-09-21 thomas.ad 
294 dd038bc6 2021-09-21 thomas.ad 	ibuf_close(&ibuf->w, msg);
295 dd038bc6 2021-09-21 thomas.ad }
296 dd038bc6 2021-09-21 thomas.ad 
297 dd038bc6 2021-09-21 thomas.ad void
298 dd038bc6 2021-09-21 thomas.ad imsg_free(struct imsg *imsg)
299 dd038bc6 2021-09-21 thomas.ad {
300 dd038bc6 2021-09-21 thomas.ad 	freezero(imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE);
301 dd038bc6 2021-09-21 thomas.ad }
302 dd038bc6 2021-09-21 thomas.ad 
303 dd038bc6 2021-09-21 thomas.ad static int
304 dd038bc6 2021-09-21 thomas.ad imsg_get_fd(struct imsgbuf *ibuf)
305 dd038bc6 2021-09-21 thomas.ad {
306 dd038bc6 2021-09-21 thomas.ad 	int		 fd;
307 dd038bc6 2021-09-21 thomas.ad 	struct imsg_fd	*ifd;
308 dd038bc6 2021-09-21 thomas.ad 
309 dd038bc6 2021-09-21 thomas.ad 	if ((ifd = TAILQ_FIRST(&ibuf->fds)) == NULL)
310 dd038bc6 2021-09-21 thomas.ad 		return (-1);
311 dd038bc6 2021-09-21 thomas.ad 
312 dd038bc6 2021-09-21 thomas.ad 	fd = ifd->fd;
313 dd038bc6 2021-09-21 thomas.ad 	TAILQ_REMOVE(&ibuf->fds, ifd, entry);
314 dd038bc6 2021-09-21 thomas.ad 	free(ifd);
315 dd038bc6 2021-09-21 thomas.ad 
316 dd038bc6 2021-09-21 thomas.ad 	return (fd);
317 dd038bc6 2021-09-21 thomas.ad }
318 dd038bc6 2021-09-21 thomas.ad 
319 dd038bc6 2021-09-21 thomas.ad int
320 dd038bc6 2021-09-21 thomas.ad imsg_flush(struct imsgbuf *ibuf)
321 dd038bc6 2021-09-21 thomas.ad {
322 dd038bc6 2021-09-21 thomas.ad 	while (ibuf->w.queued)
323 dd038bc6 2021-09-21 thomas.ad 		if (msgbuf_write(&ibuf->w) <= 0)
324 dd038bc6 2021-09-21 thomas.ad 			return (-1);
325 dd038bc6 2021-09-21 thomas.ad 	return (0);
326 dd038bc6 2021-09-21 thomas.ad }
327 dd038bc6 2021-09-21 thomas.ad 
328 dd038bc6 2021-09-21 thomas.ad void
329 dd038bc6 2021-09-21 thomas.ad imsg_clear(struct imsgbuf *ibuf)
330 dd038bc6 2021-09-21 thomas.ad {
331 dd038bc6 2021-09-21 thomas.ad 	int	fd;
332 dd038bc6 2021-09-21 thomas.ad 
333 dd038bc6 2021-09-21 thomas.ad 	msgbuf_clear(&ibuf->w);
334 dd038bc6 2021-09-21 thomas.ad 	while ((fd = imsg_get_fd(ibuf)) != -1)
335 dd038bc6 2021-09-21 thomas.ad 		close(fd);
336 dd038bc6 2021-09-21 thomas.ad }