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