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bcbf86ec | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
6d24277f | 25 | #include "includes.h" |
f8cc7664 | 26 | RCSID("$OpenBSD: misc.c,v 1.29 2005/03/10 22:01:05 deraadt Exp $"); |
6d24277f | 27 | |
1aa00dcb | 28 | #include "misc.h" |
42f11eb2 | 29 | #include "log.h" |
4ab21f86 | 30 | #include "xmalloc.h" |
6d24277f | 31 | |
255cabd9 | 32 | /* remove newline at end of string */ |
6d24277f | 33 | char * |
34 | chop(char *s) | |
35 | { | |
36 | char *t = s; | |
37 | while (*t) { | |
6aacefa7 | 38 | if (*t == '\n' || *t == '\r') { |
6d24277f | 39 | *t = '\0'; |
40 | return s; | |
41 | } | |
42 | t++; | |
43 | } | |
44 | return s; | |
45 | ||
46 | } | |
47 | ||
255cabd9 | 48 | /* set/unset filedescriptor to non-blocking */ |
170694d7 | 49 | int |
6d24277f | 50 | set_nonblock(int fd) |
51 | { | |
52 | int val; | |
89aa792b | 53 | |
6d24277f | 54 | val = fcntl(fd, F_GETFL, 0); |
55 | if (val < 0) { | |
56 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
170694d7 | 57 | return (-1); |
6d24277f | 58 | } |
a22aff1f | 59 | if (val & O_NONBLOCK) { |
170694d7 | 60 | debug3("fd %d is O_NONBLOCK", fd); |
61 | return (0); | |
a22aff1f | 62 | } |
45c42d58 | 63 | debug2("fd %d setting O_NONBLOCK", fd); |
6d24277f | 64 | val |= O_NONBLOCK; |
170694d7 | 65 | if (fcntl(fd, F_SETFL, val) == -1) { |
66 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
67 | strerror(errno)); | |
68 | return (-1); | |
69 | } | |
70 | return (0); | |
6d24277f | 71 | } |
72 | ||
170694d7 | 73 | int |
89aa792b | 74 | unset_nonblock(int fd) |
75 | { | |
76 | int val; | |
77 | ||
78 | val = fcntl(fd, F_GETFL, 0); | |
79 | if (val < 0) { | |
80 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
170694d7 | 81 | return (-1); |
89aa792b | 82 | } |
83 | if (!(val & O_NONBLOCK)) { | |
170694d7 | 84 | debug3("fd %d is not O_NONBLOCK", fd); |
85 | return (0); | |
89aa792b | 86 | } |
e04e7a19 | 87 | debug("fd %d clearing O_NONBLOCK", fd); |
89aa792b | 88 | val &= ~O_NONBLOCK; |
170694d7 | 89 | if (fcntl(fd, F_SETFL, val) == -1) { |
90 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
c92ec40b | 91 | fd, strerror(errno)); |
170694d7 | 92 | return (-1); |
93 | } | |
94 | return (0); | |
89aa792b | 95 | } |
96 | ||
bcc0381e | 97 | /* disable nagle on socket */ |
98 | void | |
99 | set_nodelay(int fd) | |
100 | { | |
3c05447a | 101 | int opt; |
102 | socklen_t optlen; | |
bcc0381e | 103 | |
811a6342 | 104 | optlen = sizeof opt; |
105 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
f7fb35fe | 106 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
811a6342 | 107 | return; |
108 | } | |
109 | if (opt == 1) { | |
110 | debug2("fd %d is TCP_NODELAY", fd); | |
111 | return; | |
112 | } | |
113 | opt = 1; | |
6226a8f8 | 114 | debug2("fd %d setting TCP_NODELAY", fd); |
811a6342 | 115 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
bcc0381e | 116 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
117 | } | |
118 | ||
6d24277f | 119 | /* Characters considered whitespace in strsep calls. */ |
120 | #define WHITESPACE " \t\r\n" | |
121 | ||
255cabd9 | 122 | /* return next token in configuration line */ |
6d24277f | 123 | char * |
124 | strdelim(char **s) | |
125 | { | |
126 | char *old; | |
127 | int wspace = 0; | |
128 | ||
129 | if (*s == NULL) | |
130 | return NULL; | |
131 | ||
132 | old = *s; | |
133 | ||
134 | *s = strpbrk(*s, WHITESPACE "="); | |
135 | if (*s == NULL) | |
136 | return (old); | |
137 | ||
138 | /* Allow only one '=' to be skipped */ | |
139 | if (*s[0] == '=') | |
140 | wspace = 1; | |
141 | *s[0] = '\0'; | |
142 | ||
143 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
144 | if (*s[0] == '=' && !wspace) | |
145 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
146 | ||
147 | return (old); | |
148 | } | |
1aa00dcb | 149 | |
3b1a83df | 150 | struct passwd * |
151 | pwcopy(struct passwd *pw) | |
152 | { | |
153 | struct passwd *copy = xmalloc(sizeof(*copy)); | |
5649fbbe | 154 | |
3b1a83df | 155 | memset(copy, 0, sizeof(*copy)); |
156 | copy->pw_name = xstrdup(pw->pw_name); | |
157 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
5649fbbe | 158 | copy->pw_gecos = xstrdup(pw->pw_gecos); |
3b1a83df | 159 | copy->pw_uid = pw->pw_uid; |
160 | copy->pw_gid = pw->pw_gid; | |
7751d4eb | 161 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD |
c4d49b85 | 162 | copy->pw_expire = pw->pw_expire; |
7751d4eb | 163 | #endif |
164 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
c4d49b85 | 165 | copy->pw_change = pw->pw_change; |
7751d4eb | 166 | #endif |
2605addd | 167 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
3b1a83df | 168 | copy->pw_class = xstrdup(pw->pw_class); |
2605addd | 169 | #endif |
3b1a83df | 170 | copy->pw_dir = xstrdup(pw->pw_dir); |
171 | copy->pw_shell = xstrdup(pw->pw_shell); | |
172 | return copy; | |
173 | } | |
174 | ||
255cabd9 | 175 | /* |
176 | * Convert ASCII string to TCP/IP port number. | |
177 | * Port must be >0 and <=65535. | |
178 | * Return 0 if invalid. | |
179 | */ | |
180 | int | |
181 | a2port(const char *s) | |
2d2a2c65 | 182 | { |
183 | long port; | |
184 | char *endp; | |
185 | ||
186 | errno = 0; | |
187 | port = strtol(s, &endp, 0); | |
188 | if (s == endp || *endp != '\0' || | |
189 | (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || | |
190 | port <= 0 || port > 65535) | |
191 | return 0; | |
192 | ||
193 | return port; | |
194 | } | |
195 | ||
e2b1fb42 | 196 | #define SECONDS 1 |
197 | #define MINUTES (SECONDS * 60) | |
198 | #define HOURS (MINUTES * 60) | |
199 | #define DAYS (HOURS * 24) | |
200 | #define WEEKS (DAYS * 7) | |
201 | ||
255cabd9 | 202 | /* |
203 | * Convert a time string into seconds; format is | |
204 | * a sequence of: | |
205 | * time[qualifier] | |
206 | * | |
207 | * Valid time qualifiers are: | |
208 | * <none> seconds | |
209 | * s|S seconds | |
210 | * m|M minutes | |
211 | * h|H hours | |
212 | * d|D days | |
213 | * w|W weeks | |
214 | * | |
215 | * Examples: | |
216 | * 90m 90 minutes | |
217 | * 1h30m 90 minutes | |
218 | * 2d 2 days | |
219 | * 1w 1 week | |
220 | * | |
221 | * Return -1 if time string is invalid. | |
222 | */ | |
223 | long | |
224 | convtime(const char *s) | |
e2b1fb42 | 225 | { |
226 | long total, secs; | |
227 | const char *p; | |
228 | char *endp; | |
229 | ||
230 | errno = 0; | |
231 | total = 0; | |
232 | p = s; | |
233 | ||
234 | if (p == NULL || *p == '\0') | |
235 | return -1; | |
236 | ||
237 | while (*p) { | |
238 | secs = strtol(p, &endp, 10); | |
239 | if (p == endp || | |
240 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
241 | secs < 0) | |
242 | return -1; | |
243 | ||
244 | switch (*endp++) { | |
245 | case '\0': | |
246 | endp--; | |
247 | case 's': | |
248 | case 'S': | |
249 | break; | |
250 | case 'm': | |
251 | case 'M': | |
252 | secs *= MINUTES; | |
253 | break; | |
254 | case 'h': | |
255 | case 'H': | |
256 | secs *= HOURS; | |
257 | break; | |
258 | case 'd': | |
259 | case 'D': | |
260 | secs *= DAYS; | |
261 | break; | |
262 | case 'w': | |
263 | case 'W': | |
264 | secs *= WEEKS; | |
265 | break; | |
266 | default: | |
267 | return -1; | |
268 | } | |
269 | total += secs; | |
270 | if (total < 0) | |
271 | return -1; | |
272 | p = endp; | |
273 | } | |
274 | ||
275 | return total; | |
276 | } | |
277 | ||
3867aa0a | 278 | /* |
279 | * Search for next delimiter between hostnames/addresses and ports. | |
280 | * Argument may be modified (for termination). | |
281 | * Returns *cp if parsing succeeds. | |
282 | * *cp is set to the start of the next delimiter, if one was found. | |
283 | * If this is the last field, *cp is set to NULL. | |
284 | */ | |
285 | char * | |
286 | hpdelim(char **cp) | |
287 | { | |
288 | char *s, *old; | |
289 | ||
290 | if (cp == NULL || *cp == NULL) | |
291 | return NULL; | |
292 | ||
293 | old = s = *cp; | |
294 | if (*s == '[') { | |
295 | if ((s = strchr(s, ']')) == NULL) | |
296 | return NULL; | |
297 | else | |
298 | s++; | |
299 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
300 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
301 | ||
302 | switch (*s) { | |
303 | case '\0': | |
304 | *cp = NULL; /* no more fields*/ | |
305 | break; | |
f8cc7664 | 306 | |
3867aa0a | 307 | case ':': |
308 | case '/': | |
309 | *s = '\0'; /* terminate */ | |
310 | *cp = s + 1; | |
311 | break; | |
f8cc7664 | 312 | |
3867aa0a | 313 | default: |
314 | return NULL; | |
315 | } | |
316 | ||
317 | return old; | |
318 | } | |
319 | ||
1fcde3fe | 320 | char * |
321 | cleanhostname(char *host) | |
322 | { | |
323 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
324 | host[strlen(host) - 1] = '\0'; | |
325 | return (host + 1); | |
326 | } else | |
327 | return host; | |
328 | } | |
329 | ||
330 | char * | |
331 | colon(char *cp) | |
332 | { | |
333 | int flag = 0; | |
334 | ||
335 | if (*cp == ':') /* Leading colon is part of file name. */ | |
336 | return (0); | |
337 | if (*cp == '[') | |
338 | flag = 1; | |
339 | ||
340 | for (; *cp; ++cp) { | |
341 | if (*cp == '@' && *(cp+1) == '[') | |
342 | flag = 1; | |
343 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
344 | return (cp+1); | |
345 | if (*cp == ':' && !flag) | |
346 | return (cp); | |
347 | if (*cp == '/') | |
348 | return (0); | |
349 | } | |
350 | return (0); | |
351 | } | |
352 | ||
255cabd9 | 353 | /* function to assist building execv() arguments */ |
8a624ebf | 354 | void |
355 | addargs(arglist *args, char *fmt, ...) | |
356 | { | |
357 | va_list ap; | |
358 | char buf[1024]; | |
9a995072 | 359 | u_int nalloc; |
8a624ebf | 360 | |
361 | va_start(ap, fmt); | |
362 | vsnprintf(buf, sizeof(buf), fmt, ap); | |
363 | va_end(ap); | |
364 | ||
c46e584f | 365 | nalloc = args->nalloc; |
8a624ebf | 366 | if (args->list == NULL) { |
c46e584f | 367 | nalloc = 32; |
8a624ebf | 368 | args->num = 0; |
c46e584f | 369 | } else if (args->num+2 >= nalloc) |
370 | nalloc *= 2; | |
8a624ebf | 371 | |
c46e584f | 372 | args->list = xrealloc(args->list, nalloc * sizeof(char *)); |
373 | args->nalloc = nalloc; | |
8a624ebf | 374 | args->list[args->num++] = xstrdup(buf); |
375 | args->list[args->num] = NULL; | |
376 | } | |
ea067773 | 377 | |
378 | /* | |
379 | * Read an entire line from a public key file into a static buffer, discarding | |
380 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
381 | */ | |
382 | int | |
383 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
41feb690 | 384 | u_long *lineno) |
ea067773 | 385 | { |
386 | while (fgets(buf, bufsz, f) != NULL) { | |
387 | (*lineno)++; | |
388 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
389 | return 0; | |
390 | } else { | |
41feb690 | 391 | debug("%s: %s line %lu exceeds size limit", __func__, |
392 | filename, *lineno); | |
ea067773 | 393 | /* discard remainder of line */ |
f8cc7664 | 394 | while (fgetc(f) != '\n' && !feof(f)) |
ea067773 | 395 | ; /* nothing */ |
396 | } | |
397 | } | |
398 | return -1; | |
399 | } |