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de13a881 | 1 | /* |
e458e5f0 | 2 | * Copyright (c) 2008-2014, Simon Schubert <2@0x2c.org>. |
de13a881 SS |
3 | * Copyright (c) 2008 The DragonFly Project. All rights reserved. |
4 | * | |
5 | * This code is derived from software contributed to The DragonFly Project | |
e458e5f0 | 6 | * by Simon Schubert <2@0x2c.org>. |
de13a881 SS |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in | |
16 | * the documentation and/or other materials provided with the | |
17 | * distribution. | |
18 | * 3. Neither the name of The DragonFly Project nor the names of its | |
19 | * contributors may be used to endorse or promote products derived | |
20 | * from this software without specific, prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
23 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
24 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
25 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
26 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
28 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
29 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
30 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
31 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
32 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
33 | * SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #include <sys/param.h> | |
9b921550 SS |
37 | #include <sys/file.h> |
38 | ||
27905878 | 39 | #include <ctype.h> |
de13a881 SS |
40 | #include <errno.h> |
41 | #include <fcntl.h> | |
42 | #include <netdb.h> | |
43 | #include <pwd.h> | |
a71122e7 SS |
44 | #include <setjmp.h> |
45 | #include <signal.h> | |
de13a881 SS |
46 | #include <stdio.h> |
47 | #include <syslog.h> | |
48 | #include <unistd.h> | |
49 | ||
50 | #include "dma.h" | |
51 | ||
52 | const char * | |
53 | hostname(void) | |
54 | { | |
6ec95705 SS |
55 | #ifndef HOST_NAME_MAX |
56 | #define HOST_NAME_MAX 255 | |
57 | #endif | |
d6240370 | 58 | static char name[HOST_NAME_MAX+1]; |
3b322ad4 | 59 | static int initialized = 0; |
c3fb272b | 60 | char *s; |
de13a881 SS |
61 | |
62 | if (initialized) | |
63 | return (name); | |
64 | ||
27905878 SS |
65 | if (config.mailname == NULL || !*config.mailname) |
66 | goto local; | |
67 | ||
68 | if (config.mailname[0] == '/') { | |
69 | /* | |
70 | * If the mailname looks like an absolute path, | |
71 | * treat it as a file. | |
72 | */ | |
73 | FILE *fp; | |
27905878 SS |
74 | |
75 | fp = fopen(config.mailname, "r"); | |
76 | if (fp == NULL) | |
77 | goto local; | |
78 | ||
c3fb272b | 79 | s = fgets(name, sizeof(name), fp); |
27905878 | 80 | fclose(fp); |
c3fb272b | 81 | if (s == NULL) |
27905878 SS |
82 | goto local; |
83 | ||
c3fb272b SS |
84 | for (s = name; *s != 0 && (isalnum(*s) || strchr("_.-", *s)); ++s) |
85 | /* NOTHING */; | |
86 | *s = 0; | |
27905878 SS |
87 | |
88 | if (!*name) | |
89 | goto local; | |
90 | ||
91 | initialized = 1; | |
92 | return (name); | |
93 | } else { | |
a0c4afa6 | 94 | snprintf(name, sizeof(name), "%s", config.mailname); |
de13a881 SS |
95 | initialized = 1; |
96 | return (name); | |
97 | } | |
27905878 SS |
98 | |
99 | local: | |
de13a881 | 100 | if (gethostname(name, sizeof(name)) != 0) |
c3fb272b | 101 | *name = 0; |
d6240370 SS |
102 | /* |
103 | * gethostname() is allowed to truncate name without NUL-termination | |
104 | * and at the same time not return an error. | |
105 | */ | |
106 | name[sizeof(name) - 1] = 0; | |
c3fb272b SS |
107 | |
108 | for (s = name; *s != 0 && (isalnum(*s) || strchr("_.-", *s)); ++s) | |
109 | /* NOTHING */; | |
110 | *s = 0; | |
111 | ||
112 | if (!*name) | |
113 | snprintf(name, sizeof(name), "unknown-hostname"); | |
114 | ||
de13a881 | 115 | initialized = 1; |
27905878 | 116 | return (name); |
de13a881 SS |
117 | } |
118 | ||
119 | void | |
120 | setlogident(const char *fmt, ...) | |
121 | { | |
42916656 | 122 | static char tag[50]; |
de13a881 | 123 | |
249ee966 | 124 | snprintf(tag, sizeof(tag), "%s", logident_base); |
de13a881 SS |
125 | if (fmt != NULL) { |
126 | va_list ap; | |
249ee966 | 127 | char sufx[50]; |
de13a881 SS |
128 | |
129 | va_start(ap, fmt); | |
249ee966 | 130 | vsnprintf(sufx, sizeof(sufx), fmt, ap); |
de13a881 | 131 | va_end(ap); |
249ee966 | 132 | snprintf(tag, sizeof(tag), "%s[%s]", logident_base, sufx); |
de13a881 SS |
133 | } |
134 | closelog(); | |
249ee966 | 135 | openlog(tag, 0, LOG_MAIL); |
de13a881 SS |
136 | } |
137 | ||
138 | void | |
139 | errlog(int exitcode, const char *fmt, ...) | |
140 | { | |
141 | int oerrno = errno; | |
142 | va_list ap; | |
249ee966 | 143 | char outs[ERRMSG_SIZE]; |
de13a881 | 144 | |
249ee966 | 145 | outs[0] = 0; |
de13a881 SS |
146 | if (fmt != NULL) { |
147 | va_start(ap, fmt); | |
249ee966 | 148 | vsnprintf(outs, sizeof(outs), fmt, ap); |
de13a881 SS |
149 | va_end(ap); |
150 | } | |
151 | ||
65da520c | 152 | errno = oerrno; |
249ee966 | 153 | if (*outs != 0) { |
de13a881 SS |
154 | syslog(LOG_ERR, "%s: %m", outs); |
155 | fprintf(stderr, "%s: %s: %s\n", getprogname(), outs, strerror(oerrno)); | |
156 | } else { | |
157 | syslog(LOG_ERR, "%m"); | |
158 | fprintf(stderr, "%s: %s\n", getprogname(), strerror(oerrno)); | |
159 | } | |
160 | ||
161 | exit(exitcode); | |
162 | } | |
163 | ||
164 | void | |
165 | errlogx(int exitcode, const char *fmt, ...) | |
166 | { | |
167 | va_list ap; | |
249ee966 | 168 | char outs[ERRMSG_SIZE]; |
de13a881 | 169 | |
249ee966 | 170 | outs[0] = 0; |
de13a881 SS |
171 | if (fmt != NULL) { |
172 | va_start(ap, fmt); | |
249ee966 | 173 | vsnprintf(outs, sizeof(outs), fmt, ap); |
de13a881 SS |
174 | va_end(ap); |
175 | } | |
176 | ||
249ee966 | 177 | if (*outs != 0) { |
de13a881 SS |
178 | syslog(LOG_ERR, "%s", outs); |
179 | fprintf(stderr, "%s: %s\n", getprogname(), outs); | |
180 | } else { | |
181 | syslog(LOG_ERR, "Unknown error"); | |
182 | fprintf(stderr, "%s: Unknown error\n", getprogname()); | |
183 | } | |
184 | ||
185 | exit(exitcode); | |
186 | } | |
187 | ||
249ee966 | 188 | static int |
de13a881 SS |
189 | check_username(const char *name, uid_t ckuid) |
190 | { | |
191 | struct passwd *pwd; | |
192 | ||
193 | if (name == NULL) | |
249ee966 | 194 | return (0); |
de13a881 SS |
195 | pwd = getpwnam(name); |
196 | if (pwd == NULL || pwd->pw_uid != ckuid) | |
249ee966 SS |
197 | return (0); |
198 | snprintf(username, sizeof(username), "%s", name); | |
199 | return (1); | |
de13a881 SS |
200 | } |
201 | ||
202 | void | |
203 | set_username(void) | |
204 | { | |
205 | struct passwd *pwd; | |
de13a881 | 206 | |
75fdf182 SS |
207 | useruid = getuid(); |
208 | if (check_username(getlogin(), useruid)) | |
de13a881 | 209 | return; |
75fdf182 | 210 | if (check_username(getenv("LOGNAME"), useruid)) |
de13a881 | 211 | return; |
75fdf182 | 212 | if (check_username(getenv("USER"), useruid)) |
de13a881 | 213 | return; |
75fdf182 | 214 | pwd = getpwuid(useruid); |
249ee966 | 215 | if (pwd != NULL && pwd->pw_name != NULL && pwd->pw_name[0] != '\0') { |
75fdf182 | 216 | if (check_username(pwd->pw_name, useruid)) |
de13a881 | 217 | return; |
de13a881 | 218 | } |
75fdf182 | 219 | snprintf(username, sizeof(username), "uid=%ld", (long)useruid); |
de13a881 SS |
220 | } |
221 | ||
222 | void | |
223 | deltmp(void) | |
224 | { | |
225 | struct stritem *t; | |
226 | ||
227 | SLIST_FOREACH(t, &tmpfs, next) { | |
228 | unlink(t->str); | |
229 | } | |
230 | } | |
231 | ||
a71122e7 SS |
232 | static sigjmp_buf sigbuf; |
233 | static int sigbuf_valid; | |
234 | ||
235 | static void | |
236 | sigalrm_handler(int signo) | |
237 | { | |
238 | (void)signo; /* so that gcc doesn't complain */ | |
239 | if (sigbuf_valid) | |
240 | siglongjmp(sigbuf, 1); | |
241 | } | |
242 | ||
243 | int | |
244 | do_timeout(int timeout, int dojmp) | |
245 | { | |
246 | struct sigaction act; | |
247 | int ret = 0; | |
248 | ||
249 | sigemptyset(&act.sa_mask); | |
250 | act.sa_flags = 0; | |
251 | ||
252 | if (timeout) { | |
253 | act.sa_handler = sigalrm_handler; | |
254 | if (sigaction(SIGALRM, &act, NULL) != 0) | |
255 | syslog(LOG_WARNING, "can not set signal handler: %m"); | |
256 | if (dojmp) { | |
257 | ret = sigsetjmp(sigbuf, 1); | |
258 | if (ret) | |
259 | goto disable; | |
260 | /* else just programmed */ | |
261 | sigbuf_valid = 1; | |
262 | } | |
263 | ||
264 | alarm(timeout); | |
265 | } else { | |
266 | disable: | |
267 | alarm(0); | |
268 | ||
269 | act.sa_handler = SIG_IGN; | |
270 | if (sigaction(SIGALRM, &act, NULL) != 0) | |
271 | syslog(LOG_WARNING, "can not remove signal handler: %m"); | |
272 | sigbuf_valid = 0; | |
273 | } | |
274 | ||
275 | return (ret); | |
276 | } | |
277 | ||
de13a881 SS |
278 | int |
279 | open_locked(const char *fname, int flags, ...) | |
280 | { | |
281 | int mode = 0; | |
282 | ||
283 | if (flags & O_CREAT) { | |
284 | va_list ap; | |
285 | va_start(ap, flags); | |
286 | mode = va_arg(ap, int); | |
287 | va_end(ap); | |
288 | } | |
289 | ||
290 | #ifndef O_EXLOCK | |
291 | int fd, save_errno; | |
292 | ||
293 | fd = open(fname, flags, mode); | |
294 | if (fd < 0) | |
295 | return(fd); | |
296 | if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) { | |
297 | save_errno = errno; | |
298 | close(fd); | |
299 | errno = save_errno; | |
300 | return(-1); | |
301 | } | |
302 | return(fd); | |
303 | #else | |
304 | return(open(fname, flags|O_EXLOCK, mode)); | |
305 | #endif | |
306 | } | |
307 | ||
308 | char * | |
309 | rfc822date(void) | |
310 | { | |
311 | static char str[50]; | |
312 | size_t error; | |
313 | time_t now; | |
314 | ||
315 | now = time(NULL); | |
316 | error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z", | |
317 | localtime(&now)); | |
318 | if (error == 0) | |
319 | strcpy(str, "(date fail)"); | |
320 | return (str); | |
321 | } | |
322 | ||
323 | int | |
324 | strprefixcmp(const char *str, const char *prefix) | |
325 | { | |
326 | return (strncasecmp(str, prefix, strlen(prefix))); | |
327 | } | |
328 | ||
ee613428 SS |
329 | void |
330 | init_random(void) | |
331 | { | |
332 | unsigned int seed; | |
333 | int rf; | |
334 | ||
335 | rf = open("/dev/urandom", O_RDONLY); | |
336 | if (rf == -1) | |
337 | rf = open("/dev/random", O_RDONLY); | |
338 | ||
339 | if (!(rf != -1 && read(rf, &seed, sizeof(seed)) == sizeof(seed))) | |
340 | seed = (time(NULL) ^ getpid()) + (uintptr_t)&seed; | |
341 | ||
342 | srandom(seed); | |
343 | ||
344 | if (rf != -1) | |
345 | close(rf); | |
346 | } |