doc: Added a manpage for accesslog.
[ashd.git] / src / accesslog.c
CommitLineData
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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>
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28
29#ifdef HAVE_CONFIG_H
30#include <config.h>
31#endif
32#include <utils.h>
33#include <log.h>
34#include <req.h>
35#include <proc.h>
36
37#define DEFFORMAT "%{%Y-%m-%d %H:%M:%S}t %m %u %A \"%G\""
38
39static int ch;
f99bcc64 40static char *outname = NULL;
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41static FILE *out;
42static int flush = 1;
43static char *format;
44static time_t now;
f99bcc64 45static volatile int reopen = 0;
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46
47static void qputs(char *s, FILE *o)
48{
49 for(; *s; s++) {
50 if(*s == '\"') {
51 fputs("\\\"", o);
52 } else if(*s == '\\') {
53 fputs("\\\\", o);
54 } else if(*s == '\n') {
55 fputs("\\n", o);
56 } else if(*s == '\t') {
57 fputs("\\t", o);
58 } else if((*s < 32) || (*s >= 128)) {
59 fprintf(o, "\\x%02x", *s);
60 } else {
61 fputc(*s, o);
62 }
63 }
64}
65
66static void logitem(struct hthead *req, char o, char *d)
67{
68 char *h, *p;
69 char buf[1024];
70 struct timeval tv;
71
72 switch(o) {
73 case '%':
74 putc('%', out);
75 break;
76 case 'h':
77 if((h = getheader(req, d)) == NULL) {
78 putc('-', out);
79 } else {
80 qputs(h, out);
81 }
82 break;
83 case 'u':
84 qputs(req->url, out);
85 break;
86 case 'U':
87 strcpy(buf, req->url);
88 if((p = strchr(buf, '?')) != NULL)
89 *p = 0;
90 qputs(buf, out);
91 break;
92 case 'm':
93 qputs(req->method, out);
94 break;
95 case 'r':
96 qputs(req->rest, out);
97 break;
98 case 'v':
99 qputs(req->ver, out);
100 break;
101 case 't':
102 if(!*d)
103 d = "%a, %d %b %Y %H:%M:%S %z";
104 strftime(buf, sizeof(buf), d, localtime(&now));
105 qputs(buf, out);
106 break;
107 case 'T':
108 if(!*d)
109 d = "%a, %d %b %Y %H:%M:%S %z";
110 strftime(buf, sizeof(buf), d, gmtime(&now));
111 qputs(buf, out);
112 break;
113 case 's':
114 gettimeofday(&tv, NULL);
115 fprintf(out, "%06i", (int)tv.tv_usec);
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
132static 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
165static void serve(struct hthead *req, int fd)
166{
167 now = time(NULL);
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
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175static void sighandler(int sig)
176{
177 if(sig == SIGHUP)
178 reopen = 1;
179}
180
181static void reopenlog(void)
182{
183 FILE *new;
184
185 if(outname == NULL) {
186 flog(LOG_WARNING, "accesslog: received SIGHUP but logging to stdout, so ignoring");
187 return;
188 }
189 if((new = fopen(outname, "a")) == NULL) {
190 flog(LOG_WARNING, "accesslog: could not reopen log file `%s' on SIGHUP: %s", outname, strerror(errno));
191 return;
192 }
193 fclose(out);
194 out = new;
195}
196
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197static void usage(FILE *out)
198{
9701afc5 199 fprintf(out, "usage: accesslog [-hFa] [-f FORMAT] OUTFILE CHILD [ARGS...]\n");
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200}
201
202int main(int argc, char **argv)
203{
204 int c, ret;
205 struct hthead *req;
206 int fd;
207 struct pollfd pfd[2];
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208
209 optarg = NULL;
9701afc5 210 while((c = getopt(argc, argv, "+hFaf:")) >= 0) {
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211 switch(c) {
212 case 'h':
213 usage(stdout);
214 exit(0);
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215 case 'F':
216 flush = 0;
217 break;
218 case 'f':
219 format = optarg;
220 break;
221 case 'a':
222 format = "%A - - [%{%d/%b/%Y:%H:%M:%S %z}t] \"%m %u %v\" - - \"%R\" \"%G\"";
223 break;
224 default:
225 usage(stderr);
226 exit(1);
227 }
228 }
9701afc5 229 if(argc - optind < 2) {
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230 usage(stderr);
231 exit(1);
232 }
233 if(format == NULL)
234 format = DEFFORMAT;
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235 if(!strcmp(argv[optind], "-"))
236 outname = NULL;
237 else
238 outname = argv[optind];
239 if(outname == NULL) {
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240 out = stdout;
241 } else {
242 if((out = fopen(argv[optind], "a")) == NULL) {
243 flog(LOG_ERR, "accesslog: could not open %s for logging: %s", argv[optind], strerror(errno));
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244 exit(1);
245 }
048ac115 246 }
9701afc5 247 if((ch = stdmkchild(argv + optind + 1, NULL, NULL)) < 0) {
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248 flog(LOG_ERR, "accesslog: could fork child: %s", strerror(errno));
249 exit(1);
250 }
f99bcc64 251 signal(SIGHUP, sighandler);
048ac115 252 while(1) {
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253 if(reopen) {
254 reopenlog();
255 reopen = 0;
256 }
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257 memset(pfd, 0, sizeof(pfd));
258 pfd[0].fd = 0;
259 pfd[0].events = POLLIN;
260 pfd[1].fd = ch;
261 pfd[1].events = POLLHUP;
262 if((ret = poll(pfd, 2, -1)) < 0) {
263 if(errno != EINTR) {
264 flog(LOG_ERR, "accesslog: error in poll: %s", strerror(errno));
265 exit(1);
266 }
267 }
268 if(pfd[0].revents) {
269 if((fd = recvreq(0, &req)) < 0) {
270 if(errno == 0)
271 break;
272 flog(LOG_ERR, "accesslog: error in recvreq: %s", strerror(errno));
273 exit(1);
274 }
275 serve(req, fd);
276 freehthead(req);
277 close(fd);
278 }
279 if(pfd[1].revents & POLLHUP)
280 break;
281 }
282 return(0);
283}