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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 | { | |
54 | static char name[MAXHOSTNAMELEN+1]; | |
3b322ad4 | 55 | static int initialized = 0; |
de13a881 SS |
56 | |
57 | if (initialized) | |
58 | return (name); | |
59 | ||
27905878 SS |
60 | if (config.mailname == NULL || !*config.mailname) |
61 | goto local; | |
62 | ||
63 | if (config.mailname[0] == '/') { | |
64 | /* | |
65 | * If the mailname looks like an absolute path, | |
66 | * treat it as a file. | |
67 | */ | |
68 | FILE *fp; | |
69 | char *res; | |
70 | ||
71 | fp = fopen(config.mailname, "r"); | |
72 | if (fp == NULL) | |
73 | goto local; | |
74 | ||
75 | res = fgets(name, sizeof(name), fp); | |
76 | fclose(fp); | |
77 | if (res == NULL) | |
78 | goto local; | |
79 | ||
80 | while (*res != 0 && !isspace(*res)) | |
81 | ++res; | |
82 | *res = 0; | |
83 | ||
84 | if (!*name) | |
85 | goto local; | |
86 | ||
87 | initialized = 1; | |
88 | return (name); | |
89 | } else { | |
a0c4afa6 | 90 | snprintf(name, sizeof(name), "%s", config.mailname); |
de13a881 SS |
91 | initialized = 1; |
92 | return (name); | |
93 | } | |
27905878 SS |
94 | |
95 | local: | |
de13a881 SS |
96 | if (gethostname(name, sizeof(name)) != 0) |
97 | strcpy(name, "(unknown hostname)"); | |
98 | initialized = 1; | |
27905878 | 99 | return (name); |
de13a881 SS |
100 | } |
101 | ||
102 | void | |
103 | setlogident(const char *fmt, ...) | |
104 | { | |
249ee966 | 105 | char tag[50]; |
de13a881 | 106 | |
249ee966 | 107 | snprintf(tag, sizeof(tag), "%s", logident_base); |
de13a881 SS |
108 | if (fmt != NULL) { |
109 | va_list ap; | |
249ee966 | 110 | char sufx[50]; |
de13a881 SS |
111 | |
112 | va_start(ap, fmt); | |
249ee966 | 113 | vsnprintf(sufx, sizeof(sufx), fmt, ap); |
de13a881 | 114 | va_end(ap); |
249ee966 | 115 | snprintf(tag, sizeof(tag), "%s[%s]", logident_base, sufx); |
de13a881 SS |
116 | } |
117 | closelog(); | |
249ee966 | 118 | openlog(tag, 0, LOG_MAIL); |
de13a881 SS |
119 | } |
120 | ||
121 | void | |
122 | errlog(int exitcode, const char *fmt, ...) | |
123 | { | |
124 | int oerrno = errno; | |
125 | va_list ap; | |
249ee966 | 126 | char outs[ERRMSG_SIZE]; |
de13a881 | 127 | |
249ee966 | 128 | outs[0] = 0; |
de13a881 SS |
129 | if (fmt != NULL) { |
130 | va_start(ap, fmt); | |
249ee966 | 131 | vsnprintf(outs, sizeof(outs), fmt, ap); |
de13a881 SS |
132 | va_end(ap); |
133 | } | |
134 | ||
249ee966 | 135 | if (*outs != 0) { |
de13a881 SS |
136 | syslog(LOG_ERR, "%s: %m", outs); |
137 | fprintf(stderr, "%s: %s: %s\n", getprogname(), outs, strerror(oerrno)); | |
138 | } else { | |
139 | syslog(LOG_ERR, "%m"); | |
140 | fprintf(stderr, "%s: %s\n", getprogname(), strerror(oerrno)); | |
141 | } | |
142 | ||
143 | exit(exitcode); | |
144 | } | |
145 | ||
146 | void | |
147 | errlogx(int exitcode, const char *fmt, ...) | |
148 | { | |
149 | va_list ap; | |
249ee966 | 150 | char outs[ERRMSG_SIZE]; |
de13a881 | 151 | |
249ee966 | 152 | outs[0] = 0; |
de13a881 SS |
153 | if (fmt != NULL) { |
154 | va_start(ap, fmt); | |
249ee966 | 155 | vsnprintf(outs, sizeof(outs), fmt, ap); |
de13a881 SS |
156 | va_end(ap); |
157 | } | |
158 | ||
249ee966 | 159 | if (*outs != 0) { |
de13a881 SS |
160 | syslog(LOG_ERR, "%s", outs); |
161 | fprintf(stderr, "%s: %s\n", getprogname(), outs); | |
162 | } else { | |
163 | syslog(LOG_ERR, "Unknown error"); | |
164 | fprintf(stderr, "%s: Unknown error\n", getprogname()); | |
165 | } | |
166 | ||
167 | exit(exitcode); | |
168 | } | |
169 | ||
249ee966 | 170 | static int |
de13a881 SS |
171 | check_username(const char *name, uid_t ckuid) |
172 | { | |
173 | struct passwd *pwd; | |
174 | ||
175 | if (name == NULL) | |
249ee966 | 176 | return (0); |
de13a881 SS |
177 | pwd = getpwnam(name); |
178 | if (pwd == NULL || pwd->pw_uid != ckuid) | |
249ee966 SS |
179 | return (0); |
180 | snprintf(username, sizeof(username), "%s", name); | |
181 | return (1); | |
de13a881 SS |
182 | } |
183 | ||
184 | void | |
185 | set_username(void) | |
186 | { | |
187 | struct passwd *pwd; | |
de13a881 SS |
188 | uid_t uid; |
189 | ||
190 | uid = getuid(); | |
249ee966 | 191 | if (check_username(getlogin(), uid)) |
de13a881 | 192 | return; |
249ee966 | 193 | if (check_username(getenv("LOGNAME"), uid)) |
de13a881 | 194 | return; |
249ee966 | 195 | if (check_username(getenv("USER"), uid)) |
de13a881 SS |
196 | return; |
197 | pwd = getpwuid(uid); | |
249ee966 SS |
198 | if (pwd != NULL && pwd->pw_name != NULL && pwd->pw_name[0] != '\0') { |
199 | if (check_username(pwd->pw_name, uid)) | |
de13a881 | 200 | return; |
de13a881 | 201 | } |
249ee966 | 202 | snprintf(username, sizeof(username), "uid=%ld", (long)uid); |
de13a881 SS |
203 | } |
204 | ||
205 | void | |
206 | deltmp(void) | |
207 | { | |
208 | struct stritem *t; | |
209 | ||
210 | SLIST_FOREACH(t, &tmpfs, next) { | |
211 | unlink(t->str); | |
212 | } | |
213 | } | |
214 | ||
a71122e7 SS |
215 | static sigjmp_buf sigbuf; |
216 | static int sigbuf_valid; | |
217 | ||
218 | static void | |
219 | sigalrm_handler(int signo) | |
220 | { | |
221 | (void)signo; /* so that gcc doesn't complain */ | |
222 | if (sigbuf_valid) | |
223 | siglongjmp(sigbuf, 1); | |
224 | } | |
225 | ||
226 | int | |
227 | do_timeout(int timeout, int dojmp) | |
228 | { | |
229 | struct sigaction act; | |
230 | int ret = 0; | |
231 | ||
232 | sigemptyset(&act.sa_mask); | |
233 | act.sa_flags = 0; | |
234 | ||
235 | if (timeout) { | |
236 | act.sa_handler = sigalrm_handler; | |
237 | if (sigaction(SIGALRM, &act, NULL) != 0) | |
238 | syslog(LOG_WARNING, "can not set signal handler: %m"); | |
239 | if (dojmp) { | |
240 | ret = sigsetjmp(sigbuf, 1); | |
241 | if (ret) | |
242 | goto disable; | |
243 | /* else just programmed */ | |
244 | sigbuf_valid = 1; | |
245 | } | |
246 | ||
247 | alarm(timeout); | |
248 | } else { | |
249 | disable: | |
250 | alarm(0); | |
251 | ||
252 | act.sa_handler = SIG_IGN; | |
253 | if (sigaction(SIGALRM, &act, NULL) != 0) | |
254 | syslog(LOG_WARNING, "can not remove signal handler: %m"); | |
255 | sigbuf_valid = 0; | |
256 | } | |
257 | ||
258 | return (ret); | |
259 | } | |
260 | ||
de13a881 SS |
261 | int |
262 | open_locked(const char *fname, int flags, ...) | |
263 | { | |
264 | int mode = 0; | |
265 | ||
266 | if (flags & O_CREAT) { | |
267 | va_list ap; | |
268 | va_start(ap, flags); | |
269 | mode = va_arg(ap, int); | |
270 | va_end(ap); | |
271 | } | |
272 | ||
273 | #ifndef O_EXLOCK | |
274 | int fd, save_errno; | |
275 | ||
276 | fd = open(fname, flags, mode); | |
277 | if (fd < 0) | |
278 | return(fd); | |
279 | if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) { | |
280 | save_errno = errno; | |
281 | close(fd); | |
282 | errno = save_errno; | |
283 | return(-1); | |
284 | } | |
285 | return(fd); | |
286 | #else | |
287 | return(open(fname, flags|O_EXLOCK, mode)); | |
288 | #endif | |
289 | } | |
290 | ||
291 | char * | |
292 | rfc822date(void) | |
293 | { | |
294 | static char str[50]; | |
295 | size_t error; | |
296 | time_t now; | |
297 | ||
298 | now = time(NULL); | |
299 | error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z", | |
300 | localtime(&now)); | |
301 | if (error == 0) | |
302 | strcpy(str, "(date fail)"); | |
303 | return (str); | |
304 | } | |
305 | ||
306 | int | |
307 | strprefixcmp(const char *str, const char *prefix) | |
308 | { | |
309 | return (strncasecmp(str, prefix, strlen(prefix))); | |
310 | } | |
311 | ||
ee613428 SS |
312 | void |
313 | init_random(void) | |
314 | { | |
315 | unsigned int seed; | |
316 | int rf; | |
317 | ||
318 | rf = open("/dev/urandom", O_RDONLY); | |
319 | if (rf == -1) | |
320 | rf = open("/dev/random", O_RDONLY); | |
321 | ||
322 | if (!(rf != -1 && read(rf, &seed, sizeof(seed)) == sizeof(seed))) | |
323 | seed = (time(NULL) ^ getpid()) + (uintptr_t)&seed; | |
324 | ||
325 | srandom(seed); | |
326 | ||
327 | if (rf != -1) | |
328 | close(rf); | |
329 | } |