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048ac115 FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | #include <unistd.h> | |
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <sys/poll.h> | |
25 | #include <time.h> | |
26 | #include <sys/time.h> | |
f99bcc64 | 27 | #include <signal.h> |
472abd3c | 28 | #include <fcntl.h> |
ca170d77 | 29 | #include <sys/stat.h> |
048ac115 FT |
30 | |
31 | #ifdef HAVE_CONFIG_H | |
32 | #include <config.h> | |
33 | #endif | |
34 | #include <utils.h> | |
35 | #include <log.h> | |
36 | #include <req.h> | |
37 | #include <proc.h> | |
38 | ||
39 | #define DEFFORMAT "%{%Y-%m-%d %H:%M:%S}t %m %u %A \"%G\"" | |
40 | ||
41 | static int ch; | |
f99bcc64 | 42 | static char *outname = NULL; |
048ac115 | 43 | static FILE *out; |
ca170d77 | 44 | static int flush = 1, locklog = 1; |
048ac115 | 45 | static char *format; |
af222eef | 46 | static struct timeval now; |
f99bcc64 | 47 | static volatile int reopen = 0; |
048ac115 FT |
48 | |
49 | static void qputs(char *s, FILE *o) | |
50 | { | |
51 | for(; *s; s++) { | |
52 | if(*s == '\"') { | |
53 | fputs("\\\"", o); | |
54 | } else if(*s == '\\') { | |
55 | fputs("\\\\", o); | |
56 | } else if(*s == '\n') { | |
57 | fputs("\\n", o); | |
58 | } else if(*s == '\t') { | |
59 | fputs("\\t", o); | |
60 | } else if((*s < 32) || (*s >= 128)) { | |
61 | fprintf(o, "\\x%02x", *s); | |
62 | } else { | |
63 | fputc(*s, o); | |
64 | } | |
65 | } | |
66 | } | |
67 | ||
68 | static void logitem(struct hthead *req, char o, char *d) | |
69 | { | |
70 | char *h, *p; | |
71 | char buf[1024]; | |
048ac115 FT |
72 | |
73 | switch(o) { | |
74 | case '%': | |
75 | putc('%', out); | |
76 | break; | |
77 | case 'h': | |
78 | if((h = getheader(req, d)) == NULL) { | |
79 | putc('-', out); | |
80 | } else { | |
81 | qputs(h, out); | |
82 | } | |
83 | break; | |
84 | case 'u': | |
85 | qputs(req->url, out); | |
86 | break; | |
87 | case 'U': | |
88 | strcpy(buf, req->url); | |
89 | if((p = strchr(buf, '?')) != NULL) | |
90 | *p = 0; | |
91 | qputs(buf, out); | |
92 | break; | |
93 | case 'm': | |
94 | qputs(req->method, out); | |
95 | break; | |
96 | case 'r': | |
97 | qputs(req->rest, out); | |
98 | break; | |
99 | case 'v': | |
100 | qputs(req->ver, out); | |
101 | break; | |
102 | case 't': | |
103 | if(!*d) | |
104 | d = "%a, %d %b %Y %H:%M:%S %z"; | |
af222eef | 105 | strftime(buf, sizeof(buf), d, localtime(&now.tv_sec)); |
048ac115 FT |
106 | qputs(buf, out); |
107 | break; | |
108 | case 'T': | |
109 | if(!*d) | |
110 | d = "%a, %d %b %Y %H:%M:%S %z"; | |
af222eef | 111 | strftime(buf, sizeof(buf), d, gmtime(&now.tv_sec)); |
048ac115 FT |
112 | qputs(buf, out); |
113 | break; | |
114 | case 's': | |
af222eef | 115 | fprintf(out, "%06i", (int)now.tv_usec); |
048ac115 FT |
116 | break; |
117 | case 'A': | |
118 | logitem(req, 'h', "X-Ash-Address"); | |
119 | break; | |
120 | case 'H': | |
121 | logitem(req, 'h', "Host"); | |
122 | break; | |
123 | case 'R': | |
124 | logitem(req, 'h', "Referer"); | |
125 | break; | |
126 | case 'G': | |
127 | logitem(req, 'h', "User-Agent"); | |
128 | break; | |
129 | } | |
130 | } | |
131 | ||
132 | static void logreq(struct hthead *req) | |
133 | { | |
134 | char *p, *p2; | |
135 | char d[strlen(format)]; | |
136 | char o; | |
137 | ||
138 | p = format; | |
139 | while(*p) { | |
140 | if(*p == '%') { | |
141 | p++; | |
142 | if(*p == '{') { | |
143 | p++; | |
144 | if((p2 = strchr(p, '}')) == NULL) | |
145 | continue; | |
146 | memcpy(d, p, p2 - p); | |
147 | d[p2 - p] = 0; | |
148 | p = p2 + 1; | |
149 | } else { | |
150 | d[0] = 0; | |
151 | } | |
152 | o = *p++; | |
153 | if(o == 0) | |
154 | break; | |
155 | logitem(req, o, d); | |
156 | } else { | |
157 | fputc(*p++, out); | |
158 | } | |
159 | } | |
160 | fputc('\n', out); | |
161 | if(flush) | |
162 | fflush(out); | |
163 | } | |
164 | ||
165 | static void serve(struct hthead *req, int fd) | |
166 | { | |
af222eef | 167 | gettimeofday(&now, NULL); |
048ac115 FT |
168 | if(sendreq(ch, req, fd)) { |
169 | flog(LOG_ERR, "accesslog: could not pass request to child: %s", strerror(errno)); | |
170 | exit(1); | |
171 | } | |
172 | logreq(req); | |
173 | } | |
174 | ||
f99bcc64 FT |
175 | static void sighandler(int sig) |
176 | { | |
177 | if(sig == SIGHUP) | |
178 | reopen = 1; | |
179 | } | |
180 | ||
ca170d77 FT |
181 | static int lockfile(FILE *file) |
182 | { | |
183 | struct flock ld; | |
184 | ||
185 | memset(&ld, 0, sizeof(ld)); | |
186 | ld.l_type = F_WRLCK; | |
187 | ld.l_whence = SEEK_SET; | |
188 | ld.l_start = 0; | |
189 | ld.l_len = 0; | |
190 | return(fcntl(fileno(file), F_SETLK, &ld)); | |
191 | } | |
192 | ||
193 | static void fetchpid(char *filename) | |
194 | { | |
195 | int fd, ret; | |
196 | struct flock ld; | |
197 | ||
198 | if((fd = open(filename, O_WRONLY)) < 0) { | |
199 | fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno)); | |
200 | exit(1); | |
201 | } | |
202 | memset(&ld, 0, sizeof(ld)); | |
203 | ld.l_type = F_WRLCK; | |
204 | ld.l_whence = SEEK_SET; | |
205 | ld.l_start = 0; | |
206 | ld.l_len = 0; | |
207 | ret = fcntl(fd, F_GETLK, &ld); | |
208 | close(fd); | |
209 | if(ret) { | |
210 | fprintf(stderr, "accesslog: %s: %s\n", filename, strerror(errno)); | |
211 | exit(1); | |
212 | } | |
213 | if(ld.l_type == F_UNLCK) { | |
214 | fprintf(stderr, "accesslog: %s: not locked\n", filename); | |
215 | exit(1); | |
216 | } | |
217 | printf("%i\n", (int)ld.l_pid); | |
218 | } | |
219 | ||
f99bcc64 FT |
220 | static void reopenlog(void) |
221 | { | |
222 | FILE *new; | |
ca170d77 | 223 | struct stat olds, news; |
f99bcc64 FT |
224 | |
225 | if(outname == NULL) { | |
226 | flog(LOG_WARNING, "accesslog: received SIGHUP but logging to stdout, so ignoring"); | |
227 | return; | |
228 | } | |
ca170d77 FT |
229 | if(locklog) { |
230 | if(fstat(fileno(out), &olds)) { | |
231 | flog(LOG_ERR, "accesslog: could not stat current logfile(?!): %s", strerror(errno)); | |
232 | return; | |
233 | } | |
234 | if(!stat(outname, &news)) { | |
235 | if((olds.st_dev == news.st_dev) && (olds.st_ino == news.st_ino)) { | |
236 | /* | |
237 | * This needs to be ignored, because if the same logfile | |
238 | * is opened and then closed, the lock is lost. To quote | |
239 | * the Linux fcntl(2) manpage: "This is bad." No kidding. | |
240 | * | |
241 | * Technically, there is a race condition here when the | |
242 | * file has been stat'ed but not yet opened, where the old | |
243 | * log file, having been previously renamed, changes name | |
244 | * back to the name accesslog knows and is thus reopened | |
245 | * regardlessly, but I think that might fit under the | |
246 | * idiom "pathological case". It should, at least, not be | |
247 | * a security problem. | |
248 | */ | |
249 | flog(LOG_INFO, "accesslog: received SIGHUP, but logfile has not changed, so ignoring"); | |
250 | return; | |
251 | } | |
252 | } | |
253 | } | |
f99bcc64 FT |
254 | if((new = fopen(outname, "a")) == NULL) { |
255 | flog(LOG_WARNING, "accesslog: could not reopen log file `%s' on SIGHUP: %s", outname, strerror(errno)); | |
256 | return; | |
257 | } | |
e09f3227 | 258 | fcntl(fileno(new), F_SETFD, FD_CLOEXEC); |
ca170d77 FT |
259 | if(locklog) { |
260 | if(lockfile(new)) { | |
261 | if((errno == EAGAIN) || (errno == EACCES)) { | |
262 | flog(LOG_ERR, "accesslog: logfile is already locked; reverting to current log", strerror(errno)); | |
263 | fclose(new); | |
264 | return; | |
265 | } else { | |
266 | flog(LOG_WARNING, "accesslog: could not lock logfile, so no lock will be held: %s", strerror(errno)); | |
267 | } | |
268 | } | |
269 | } | |
f99bcc64 FT |
270 | fclose(out); |
271 | out = new; | |
272 | } | |
273 | ||
048ac115 FT |
274 | static void usage(FILE *out) |
275 | { | |
ca170d77 | 276 | fprintf(out, "usage: accesslog [-hFaL] [-f FORMAT] [-p PIDFILE] OUTFILE CHILD [ARGS...]\n"); |
e51483a1 | 277 | fprintf(out, " accesslog -P LOGFILE\n"); |
048ac115 FT |
278 | } |
279 | ||
280 | int main(int argc, char **argv) | |
281 | { | |
282 | int c, ret; | |
283 | struct hthead *req; | |
284 | int fd; | |
285 | struct pollfd pfd[2]; | |
472abd3c FT |
286 | char *pidfile; |
287 | FILE *pidout; | |
048ac115 | 288 | |
472abd3c | 289 | pidfile = NULL; |
ca170d77 | 290 | while((c = getopt(argc, argv, "+hFaLf:p:P:")) >= 0) { |
048ac115 FT |
291 | switch(c) { |
292 | case 'h': | |
293 | usage(stdout); | |
294 | exit(0); | |
048ac115 FT |
295 | case 'F': |
296 | flush = 0; | |
297 | break; | |
ca170d77 FT |
298 | case 'L': |
299 | locklog = 0; | |
300 | break; | |
048ac115 FT |
301 | case 'f': |
302 | format = optarg; | |
303 | break; | |
ca170d77 FT |
304 | case 'P': |
305 | fetchpid(optarg); | |
306 | exit(0); | |
472abd3c FT |
307 | case 'p': |
308 | pidfile = optarg; | |
309 | break; | |
048ac115 FT |
310 | case 'a': |
311 | format = "%A - - [%{%d/%b/%Y:%H:%M:%S %z}t] \"%m %u %v\" - - \"%R\" \"%G\""; | |
312 | break; | |
313 | default: | |
314 | usage(stderr); | |
315 | exit(1); | |
316 | } | |
317 | } | |
9701afc5 | 318 | if(argc - optind < 2) { |
048ac115 FT |
319 | usage(stderr); |
320 | exit(1); | |
321 | } | |
322 | if(format == NULL) | |
323 | format = DEFFORMAT; | |
f99bcc64 FT |
324 | if(!strcmp(argv[optind], "-")) |
325 | outname = NULL; | |
326 | else | |
327 | outname = argv[optind]; | |
328 | if(outname == NULL) { | |
9701afc5 | 329 | out = stdout; |
e09f3227 | 330 | locklog = 0; |
9701afc5 FT |
331 | } else { |
332 | if((out = fopen(argv[optind], "a")) == NULL) { | |
333 | flog(LOG_ERR, "accesslog: could not open %s for logging: %s", argv[optind], strerror(errno)); | |
048ac115 FT |
334 | exit(1); |
335 | } | |
e09f3227 | 336 | fcntl(fileno(out), F_SETFD, FD_CLOEXEC); |
048ac115 | 337 | } |
ca170d77 FT |
338 | if(locklog) { |
339 | if(lockfile(out)) { | |
340 | if((errno == EAGAIN) || (errno == EACCES)) { | |
341 | flog(LOG_ERR, "accesslog: logfile is already locked", strerror(errno)); | |
342 | exit(1); | |
343 | } else { | |
344 | flog(LOG_WARNING, "accesslog: could not lock logfile: %s", strerror(errno)); | |
345 | } | |
346 | } | |
347 | } | |
9701afc5 | 348 | if((ch = stdmkchild(argv + optind + 1, NULL, NULL)) < 0) { |
e3f12675 | 349 | flog(LOG_ERR, "accesslog: could not fork child: %s", strerror(errno)); |
048ac115 FT |
350 | exit(1); |
351 | } | |
f99bcc64 | 352 | signal(SIGHUP, sighandler); |
472abd3c FT |
353 | if(pidfile) { |
354 | if(!strcmp(pidfile, "-")) { | |
355 | if(!outname) { | |
356 | flog(LOG_ERR, "accesslog: cannot derive PID file name without an output file"); | |
357 | exit(1); | |
358 | } | |
359 | pidfile = sprintf2("%s.pid", outname); | |
360 | } | |
361 | if((pidout = fopen(pidfile, "w")) == NULL) { | |
362 | flog(LOG_ERR, "accesslog: could not open PID file %s for writing: %s", pidfile); | |
363 | exit(1); | |
364 | } | |
365 | fprintf(pidout, "%i\n", (int)getpid()); | |
366 | fclose(pidout); | |
367 | } | |
048ac115 | 368 | while(1) { |
f99bcc64 FT |
369 | if(reopen) { |
370 | reopenlog(); | |
371 | reopen = 0; | |
372 | } | |
048ac115 FT |
373 | memset(pfd, 0, sizeof(pfd)); |
374 | pfd[0].fd = 0; | |
375 | pfd[0].events = POLLIN; | |
376 | pfd[1].fd = ch; | |
377 | pfd[1].events = POLLHUP; | |
378 | if((ret = poll(pfd, 2, -1)) < 0) { | |
379 | if(errno != EINTR) { | |
380 | flog(LOG_ERR, "accesslog: error in poll: %s", strerror(errno)); | |
381 | exit(1); | |
382 | } | |
383 | } | |
384 | if(pfd[0].revents) { | |
385 | if((fd = recvreq(0, &req)) < 0) { | |
386 | if(errno == 0) | |
387 | break; | |
388 | flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno)); | |
389 | exit(1); | |
390 | } | |
391 | serve(req, fd); | |
392 | freehthead(req); | |
393 | close(fd); | |
394 | } | |
395 | if(pfd[1].revents & POLLHUP) | |
396 | break; | |
397 | } | |
472abd3c FT |
398 | if(pidfile != NULL) |
399 | unlink(pidfile); | |
048ac115 FT |
400 | return(0); |
401 | } |