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acddc0ed | 1 | // SPDX-License-Identifier: ISC |
8429abe0 RW |
2 | /* $OpenBSD$ */ |
3 | ||
4 | /* | |
5 | * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> | |
8429abe0 RW |
6 | */ |
7 | ||
eac6e3f0 | 8 | #include <zebra.h> |
8429abe0 | 9 | |
97b5d752 | 10 | #include "memory.h" |
cd85bc2e | 11 | #include "queue.h" |
8429abe0 RW |
12 | #include "imsg.h" |
13 | ||
c17faa4b | 14 | static int imsg_fd_overhead = 0; |
8429abe0 | 15 | |
c17faa4b | 16 | static int imsg_get_fd(struct imsgbuf *); |
8429abe0 | 17 | |
eac6e3f0 RW |
18 | #ifndef __OpenBSD__ |
19 | /* | |
20 | * The original code calls getdtablecount() which is OpenBSD specific. Use | |
21 | * available_fds() from OpenSMTPD instead. | |
22 | */ | |
996c9314 | 23 | static int available_fds(unsigned int n) |
eac6e3f0 | 24 | { |
996c9314 LB |
25 | unsigned int i; |
26 | int ret, fds[256]; | |
eac6e3f0 | 27 | |
97b5d752 | 28 | if (n > (unsigned int)array_size(fds)) |
95f7965d | 29 | return 1; |
eac6e3f0 RW |
30 | |
31 | ret = 0; | |
32 | for (i = 0; i < n; i++) { | |
33 | fds[i] = -1; | |
34 | if ((fds[i] = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { | |
35 | if (errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT) | |
36 | fds[i] = socket(AF_INET6, SOCK_DGRAM, 0); | |
37 | if (fds[i] < 0) { | |
38 | ret = 1; | |
39 | break; | |
40 | } | |
41 | } | |
42 | } | |
43 | ||
44 | for (i = 0; i < n && fds[i] >= 0; i++) | |
45 | close(fds[i]); | |
46 | ||
47 | return (ret); | |
48 | } | |
49 | #endif | |
50 | ||
996c9314 | 51 | void imsg_init(struct imsgbuf *ibuf, int fd) |
8429abe0 RW |
52 | { |
53 | msgbuf_init(&ibuf->w); | |
54 | memset(&ibuf->r, 0, sizeof(ibuf->r)); | |
55 | ibuf->fd = fd; | |
56 | ibuf->w.fd = fd; | |
57 | ibuf->pid = getpid(); | |
58 | TAILQ_INIT(&ibuf->fds); | |
59 | } | |
60 | ||
996c9314 | 61 | ssize_t imsg_read(struct imsgbuf *ibuf) |
8429abe0 | 62 | { |
996c9314 LB |
63 | struct msghdr msg; |
64 | struct cmsghdr *cmsg; | |
8429abe0 RW |
65 | union { |
66 | struct cmsghdr hdr; | |
996c9314 | 67 | char buf[CMSG_SPACE(sizeof(int) * 1)]; |
8429abe0 | 68 | } cmsgbuf; |
996c9314 | 69 | struct iovec iov; |
a2b6e694 | 70 | ssize_t n; |
996c9314 LB |
71 | int fd; |
72 | struct imsg_fd *ifd; | |
8429abe0 RW |
73 | |
74 | memset(&msg, 0, sizeof(msg)); | |
75 | memset(&cmsgbuf, 0, sizeof(cmsgbuf)); | |
76 | ||
77 | iov.iov_base = ibuf->r.buf + ibuf->r.wpos; | |
78 | iov.iov_len = sizeof(ibuf->r.buf) - ibuf->r.wpos; | |
79 | msg.msg_iov = &iov; | |
80 | msg.msg_iovlen = 1; | |
81 | msg.msg_control = &cmsgbuf.buf; | |
82 | msg.msg_controllen = sizeof(cmsgbuf.buf); | |
83 | ||
84 | if ((ifd = calloc(1, sizeof(struct imsg_fd))) == NULL) | |
95f7965d | 85 | return -1; |
8429abe0 RW |
86 | |
87 | again: | |
eac6e3f0 | 88 | #ifdef __OpenBSD__ |
996c9314 LB |
89 | if (getdtablecount() + imsg_fd_overhead |
90 | + (int)((CMSG_SPACE(sizeof(int)) - CMSG_SPACE(0)) | |
91 | / sizeof(int)) | |
8429abe0 | 92 | >= getdtablesize()) { |
eac6e3f0 | 93 | #else |
996c9314 LB |
94 | if (available_fds(imsg_fd_overhead |
95 | + (CMSG_SPACE(sizeof(int)) - CMSG_SPACE(0)) | |
96 | / sizeof(int))) { | |
eac6e3f0 | 97 | #endif |
8429abe0 RW |
98 | errno = EAGAIN; |
99 | free(ifd); | |
95f7965d | 100 | return -1; |
8429abe0 RW |
101 | } |
102 | ||
a2b6e694 | 103 | n = recvmsg(ibuf->fd, &msg, 0); |
104 | if (n == -1) { | |
8429abe0 RW |
105 | if (errno == EINTR) |
106 | goto again; | |
107 | goto fail; | |
108 | } | |
109 | ||
110 | ibuf->r.wpos += n; | |
111 | ||
112 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; | |
996c9314 LB |
113 | cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
114 | if (cmsg->cmsg_level == SOL_SOCKET | |
115 | && cmsg->cmsg_type == SCM_RIGHTS) { | |
8429abe0 RW |
116 | int i; |
117 | int j; | |
118 | ||
119 | /* | |
120 | * We only accept one file descriptor. Due to C | |
121 | * padding rules, our control buffer might contain | |
122 | * more than one fd, and we must close them. | |
123 | */ | |
996c9314 LB |
124 | j = ((char *)cmsg + cmsg->cmsg_len |
125 | - (char *)CMSG_DATA(cmsg)) | |
126 | / sizeof(int); | |
8429abe0 RW |
127 | for (i = 0; i < j; i++) { |
128 | fd = ((int *)CMSG_DATA(cmsg))[i]; | |
129 | if (ifd != NULL) { | |
130 | ifd->fd = fd; | |
131 | TAILQ_INSERT_TAIL(&ibuf->fds, ifd, | |
996c9314 | 132 | entry); |
8429abe0 RW |
133 | ifd = NULL; |
134 | } else | |
135 | close(fd); | |
136 | } | |
137 | } | |
138 | /* we do not handle other ctl data level */ | |
139 | } | |
140 | ||
141 | fail: | |
142 | free(ifd); | |
143 | return (n); | |
144 | } | |
145 | ||
996c9314 | 146 | ssize_t imsg_get(struct imsgbuf *ibuf, struct imsg *imsg) |
8429abe0 | 147 | { |
996c9314 | 148 | size_t av, left, datalen; |
8429abe0 RW |
149 | |
150 | av = ibuf->r.wpos; | |
151 | ||
152 | if (IMSG_HEADER_SIZE > av) | |
95f7965d | 153 | return 0; |
8429abe0 RW |
154 | |
155 | memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr)); | |
996c9314 | 156 | if (imsg->hdr.len < IMSG_HEADER_SIZE || imsg->hdr.len > MAX_IMSGSIZE) { |
8429abe0 | 157 | errno = ERANGE; |
95f7965d | 158 | return -1; |
8429abe0 RW |
159 | } |
160 | if (imsg->hdr.len > av) | |
95f7965d | 161 | return 0; |
8429abe0 RW |
162 | datalen = imsg->hdr.len - IMSG_HEADER_SIZE; |
163 | ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE; | |
164 | if (datalen == 0) | |
165 | imsg->data = NULL; | |
166 | else if ((imsg->data = malloc(datalen)) == NULL) | |
95f7965d | 167 | return -1; |
8429abe0 RW |
168 | |
169 | if (imsg->hdr.flags & IMSGF_HASFD) | |
170 | imsg->fd = imsg_get_fd(ibuf); | |
171 | else | |
172 | imsg->fd = -1; | |
173 | ||
dd3415b7 | 174 | if (imsg->data) |
996c9314 | 175 | memcpy(imsg->data, ibuf->r.rptr, datalen); |
8429abe0 RW |
176 | |
177 | if (imsg->hdr.len < av) { | |
178 | left = av - imsg->hdr.len; | |
179 | memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left); | |
180 | ibuf->r.wpos = left; | |
181 | } else | |
182 | ibuf->r.wpos = 0; | |
183 | ||
184 | return (datalen + IMSG_HEADER_SIZE); | |
185 | } | |
186 | ||
d7c0a89a QY |
187 | int imsg_compose(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, |
188 | pid_t pid, int fd, const void *data, uint16_t datalen) | |
8429abe0 | 189 | { |
996c9314 | 190 | struct ibuf *wbuf; |
8429abe0 RW |
191 | |
192 | if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL) | |
95f7965d | 193 | return -1; |
8429abe0 RW |
194 | |
195 | if (imsg_add(wbuf, data, datalen) == -1) | |
95f7965d | 196 | return -1; |
8429abe0 RW |
197 | |
198 | wbuf->fd = fd; | |
199 | ||
200 | imsg_close(ibuf, wbuf); | |
201 | ||
95f7965d | 202 | return 1; |
8429abe0 RW |
203 | } |
204 | ||
d7c0a89a | 205 | int imsg_composev(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, |
996c9314 | 206 | pid_t pid, int fd, const struct iovec *iov, int iovcnt) |
8429abe0 | 207 | { |
996c9314 LB |
208 | struct ibuf *wbuf; |
209 | int i, datalen = 0; | |
8429abe0 RW |
210 | |
211 | for (i = 0; i < iovcnt; i++) | |
212 | datalen += iov[i].iov_len; | |
213 | ||
214 | if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL) | |
95f7965d | 215 | return -1; |
8429abe0 RW |
216 | |
217 | for (i = 0; i < iovcnt; i++) | |
218 | if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1) | |
95f7965d | 219 | return -1; |
8429abe0 RW |
220 | |
221 | wbuf->fd = fd; | |
222 | ||
223 | imsg_close(ibuf, wbuf); | |
224 | ||
95f7965d | 225 | return 1; |
8429abe0 RW |
226 | } |
227 | ||
228 | /* ARGSUSED */ | |
d7c0a89a QY |
229 | struct ibuf *imsg_create(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, |
230 | pid_t pid, uint16_t datalen) | |
8429abe0 | 231 | { |
996c9314 LB |
232 | struct ibuf *wbuf; |
233 | struct imsg_hdr hdr; | |
8429abe0 | 234 | |
c2fb17b5 QY |
235 | memset(&hdr, 0x00, IMSG_HEADER_SIZE); |
236 | ||
8429abe0 RW |
237 | datalen += IMSG_HEADER_SIZE; |
238 | if (datalen > MAX_IMSGSIZE) { | |
239 | errno = ERANGE; | |
95f7965d | 240 | return NULL; |
8429abe0 RW |
241 | } |
242 | ||
243 | hdr.type = type; | |
244 | hdr.flags = 0; | |
245 | hdr.peerid = peerid; | |
246 | if ((hdr.pid = pid) == 0) | |
247 | hdr.pid = ibuf->pid; | |
248 | if ((wbuf = ibuf_dynamic(datalen, MAX_IMSGSIZE)) == NULL) { | |
95f7965d | 249 | return NULL; |
8429abe0 RW |
250 | } |
251 | if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1) | |
95f7965d | 252 | return NULL; |
8429abe0 RW |
253 | |
254 | return (wbuf); | |
255 | } | |
256 | ||
d7c0a89a | 257 | int imsg_add(struct ibuf *msg, const void *data, uint16_t datalen) |
8429abe0 RW |
258 | { |
259 | if (datalen) | |
260 | if (ibuf_add(msg, data, datalen) == -1) { | |
261 | ibuf_free(msg); | |
95f7965d | 262 | return -1; |
8429abe0 RW |
263 | } |
264 | return (datalen); | |
265 | } | |
266 | ||
996c9314 | 267 | void imsg_close(struct imsgbuf *ibuf, struct ibuf *msg) |
8429abe0 | 268 | { |
996c9314 | 269 | struct imsg_hdr *hdr; |
8429abe0 RW |
270 | |
271 | hdr = (struct imsg_hdr *)msg->buf; | |
272 | ||
273 | hdr->flags &= ~IMSGF_HASFD; | |
274 | if (msg->fd != -1) | |
275 | hdr->flags |= IMSGF_HASFD; | |
276 | ||
d7c0a89a | 277 | hdr->len = (uint16_t)msg->wpos; |
8429abe0 RW |
278 | |
279 | ibuf_close(&ibuf->w, msg); | |
280 | } | |
281 | ||
996c9314 | 282 | void imsg_free(struct imsg *imsg) |
8429abe0 RW |
283 | { |
284 | free(imsg->data); | |
285 | } | |
286 | ||
996c9314 | 287 | int imsg_get_fd(struct imsgbuf *ibuf) |
8429abe0 | 288 | { |
996c9314 LB |
289 | int fd; |
290 | struct imsg_fd *ifd; | |
8429abe0 | 291 | |
a43ad4fe | 292 | if ((ifd = TAILQ_POP_FIRST(&ibuf->fds, entry)) == NULL) |
95f7965d | 293 | return -1; |
8429abe0 RW |
294 | |
295 | fd = ifd->fd; | |
8429abe0 RW |
296 | free(ifd); |
297 | ||
298 | return (fd); | |
299 | } | |
300 | ||
996c9314 | 301 | int imsg_flush(struct imsgbuf *ibuf) |
8429abe0 RW |
302 | { |
303 | while (ibuf->w.queued) | |
304 | if (msgbuf_write(&ibuf->w) <= 0) | |
95f7965d DA |
305 | return -1; |
306 | return 0; | |
8429abe0 RW |
307 | } |
308 | ||
996c9314 | 309 | void imsg_clear(struct imsgbuf *ibuf) |
8429abe0 | 310 | { |
996c9314 | 311 | int fd; |
8429abe0 RW |
312 | |
313 | msgbuf_clear(&ibuf->w); | |
314 | while ((fd = imsg_get_fd(ibuf)) != -1) | |
315 | close(fd); | |
316 | } |