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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 | ||
de13a881 SS |
38 | #include <errno.h> |
39 | #include <fcntl.h> | |
40 | #include <netdb.h> | |
41 | #include <pwd.h> | |
42 | #include <stdio.h> | |
43 | #include <syslog.h> | |
44 | #include <unistd.h> | |
45 | ||
46 | #include "dma.h" | |
47 | ||
48 | const char * | |
49 | hostname(void) | |
50 | { | |
51 | static char name[MAXHOSTNAMELEN+1]; | |
3b322ad4 | 52 | static int initialized = 0; |
de13a881 | 53 | FILE *fp; |
3b322ad4 | 54 | char *res; |
de13a881 SS |
55 | size_t len; |
56 | ||
57 | if (initialized) | |
58 | return (name); | |
59 | ||
a0c4afa6 SS |
60 | if (config.mailname != NULL && config.mailname[0] != '\0') { |
61 | snprintf(name, sizeof(name), "%s", config.mailname); | |
de13a881 SS |
62 | initialized = 1; |
63 | return (name); | |
64 | } | |
a0c4afa6 SS |
65 | if (config.mailnamefile != NULL && config.mailnamefile[0] != '\0') { |
66 | fp = fopen(config.mailnamefile, "r"); | |
de13a881 | 67 | if (fp != NULL) { |
3b322ad4 PP |
68 | res = fgets(name, sizeof(name), fp); |
69 | fclose(fp); | |
70 | if (res != NULL) { | |
de13a881 SS |
71 | len = strlen(name); |
72 | while (len > 0 && | |
73 | (name[len - 1] == '\r' || | |
74 | name[len - 1] == '\n')) | |
75 | name[--len] = '\0'; | |
76 | if (name[0] != '\0') { | |
77 | initialized = 1; | |
78 | return (name); | |
79 | } | |
80 | } | |
de13a881 SS |
81 | } |
82 | } | |
83 | if (gethostname(name, sizeof(name)) != 0) | |
84 | strcpy(name, "(unknown hostname)"); | |
85 | initialized = 1; | |
86 | return name; | |
87 | } | |
88 | ||
89 | void | |
90 | setlogident(const char *fmt, ...) | |
91 | { | |
92 | char *tag = NULL; | |
93 | ||
94 | if (fmt != NULL) { | |
95 | va_list ap; | |
96 | char *sufx; | |
97 | ||
98 | va_start(ap, fmt); | |
4ffb8581 PP |
99 | if (vasprintf(&sufx, fmt, ap) != -1 && sufx != NULL) { |
100 | if (asprintf(&tag, "%s[%s]", logident_base, sufx) == -1) | |
101 | tag = NULL; | |
de13a881 SS |
102 | free(sufx); |
103 | } | |
104 | va_end(ap); | |
105 | } | |
106 | closelog(); | |
107 | openlog(tag != NULL ? tag : logident_base, 0, LOG_MAIL); | |
108 | } | |
109 | ||
110 | void | |
111 | errlog(int exitcode, const char *fmt, ...) | |
112 | { | |
113 | int oerrno = errno; | |
114 | va_list ap; | |
115 | char *outs = NULL; | |
116 | ||
117 | if (fmt != NULL) { | |
118 | va_start(ap, fmt); | |
4ffb8581 PP |
119 | if (vasprintf(&outs, fmt, ap) == -1) |
120 | outs = NULL; | |
de13a881 SS |
121 | va_end(ap); |
122 | } | |
123 | ||
124 | if (outs != NULL) { | |
125 | syslog(LOG_ERR, "%s: %m", outs); | |
126 | fprintf(stderr, "%s: %s: %s\n", getprogname(), outs, strerror(oerrno)); | |
127 | } else { | |
128 | syslog(LOG_ERR, "%m"); | |
129 | fprintf(stderr, "%s: %s\n", getprogname(), strerror(oerrno)); | |
130 | } | |
131 | ||
132 | exit(exitcode); | |
133 | } | |
134 | ||
135 | void | |
136 | errlogx(int exitcode, const char *fmt, ...) | |
137 | { | |
138 | va_list ap; | |
139 | char *outs = NULL; | |
140 | ||
141 | if (fmt != NULL) { | |
142 | va_start(ap, fmt); | |
4ffb8581 PP |
143 | if (vasprintf(&outs, fmt, ap) == -1) |
144 | outs = NULL; | |
de13a881 SS |
145 | va_end(ap); |
146 | } | |
147 | ||
148 | if (outs != NULL) { | |
149 | syslog(LOG_ERR, "%s", outs); | |
150 | fprintf(stderr, "%s: %s\n", getprogname(), outs); | |
151 | } else { | |
152 | syslog(LOG_ERR, "Unknown error"); | |
153 | fprintf(stderr, "%s: Unknown error\n", getprogname()); | |
154 | } | |
155 | ||
156 | exit(exitcode); | |
157 | } | |
158 | ||
159 | static const char * | |
160 | check_username(const char *name, uid_t ckuid) | |
161 | { | |
162 | struct passwd *pwd; | |
163 | ||
164 | if (name == NULL) | |
165 | return (NULL); | |
166 | pwd = getpwnam(name); | |
167 | if (pwd == NULL || pwd->pw_uid != ckuid) | |
168 | return (NULL); | |
169 | return (name); | |
170 | } | |
171 | ||
172 | void | |
173 | set_username(void) | |
174 | { | |
175 | struct passwd *pwd; | |
176 | char *u = NULL; | |
177 | uid_t uid; | |
178 | ||
179 | uid = getuid(); | |
180 | username = check_username(getlogin(), uid); | |
181 | if (username != NULL) | |
182 | return; | |
183 | username = check_username(getenv("LOGNAME"), uid); | |
184 | if (username != NULL) | |
185 | return; | |
186 | username = check_username(getenv("USER"), uid); | |
187 | if (username != NULL) | |
188 | return; | |
189 | pwd = getpwuid(uid); | |
190 | if (pwd != NULL && pwd->pw_name != NULL && pwd->pw_name[0] != '\0' && | |
191 | (u = strdup(pwd->pw_name)) != NULL) { | |
192 | username = check_username(u, uid); | |
193 | if (username != NULL) | |
194 | return; | |
195 | else | |
196 | free(u); | |
197 | } | |
4ffb8581 PP |
198 | if (asprintf(__DECONST(void *, &username), "%ld", (long)uid) != -1 && |
199 | username != NULL) | |
de13a881 SS |
200 | return; |
201 | username = "unknown-or-invalid-username"; | |
202 | } | |
203 | ||
204 | void | |
205 | deltmp(void) | |
206 | { | |
207 | struct stritem *t; | |
208 | ||
209 | SLIST_FOREACH(t, &tmpfs, next) { | |
210 | unlink(t->str); | |
211 | } | |
212 | } | |
213 | ||
214 | int | |
215 | open_locked(const char *fname, int flags, ...) | |
216 | { | |
217 | int mode = 0; | |
218 | ||
219 | if (flags & O_CREAT) { | |
220 | va_list ap; | |
221 | va_start(ap, flags); | |
222 | mode = va_arg(ap, int); | |
223 | va_end(ap); | |
224 | } | |
225 | ||
226 | #ifndef O_EXLOCK | |
227 | int fd, save_errno; | |
228 | ||
229 | fd = open(fname, flags, mode); | |
230 | if (fd < 0) | |
231 | return(fd); | |
232 | if (flock(fd, LOCK_EX|((flags & O_NONBLOCK)? LOCK_NB: 0)) < 0) { | |
233 | save_errno = errno; | |
234 | close(fd); | |
235 | errno = save_errno; | |
236 | return(-1); | |
237 | } | |
238 | return(fd); | |
239 | #else | |
240 | return(open(fname, flags|O_EXLOCK, mode)); | |
241 | #endif | |
242 | } | |
243 | ||
244 | char * | |
245 | rfc822date(void) | |
246 | { | |
247 | static char str[50]; | |
248 | size_t error; | |
249 | time_t now; | |
250 | ||
251 | now = time(NULL); | |
252 | error = strftime(str, sizeof(str), "%a, %d %b %Y %T %z", | |
253 | localtime(&now)); | |
254 | if (error == 0) | |
255 | strcpy(str, "(date fail)"); | |
256 | return (str); | |
257 | } | |
258 | ||
259 | int | |
260 | strprefixcmp(const char *str, const char *prefix) | |
261 | { | |
262 | return (strncasecmp(str, prefix, strlen(prefix))); | |
263 | } | |
264 | ||
ee613428 SS |
265 | void |
266 | init_random(void) | |
267 | { | |
268 | unsigned int seed; | |
269 | int rf; | |
270 | ||
271 | rf = open("/dev/urandom", O_RDONLY); | |
272 | if (rf == -1) | |
273 | rf = open("/dev/random", O_RDONLY); | |
274 | ||
275 | if (!(rf != -1 && read(rf, &seed, sizeof(seed)) == sizeof(seed))) | |
276 | seed = (time(NULL) ^ getpid()) + (uintptr_t)&seed; | |
277 | ||
278 | srandom(seed); | |
279 | ||
280 | if (rf != -1) | |
281 | close(rf); | |
282 | } |