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