callcgi: Fixed PATH_INFO bug.
[ashd.git] / lib / resp.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>
ad1983c4 20#include <unistd.h>
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21#include <string.h>
22#include <stdio.h>
23#include <stdarg.h>
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24#include <time.h>
25#include <regex.h>
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26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include <utils.h>
31#include <resp.h>
32
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33static char safechars[128] = {
34 /* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
35 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
36 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
38 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
39 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
40 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
41 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
42 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
43};
44
45char *urlquote(char *text)
46{
47 static char *ret = NULL;
48 struct charbuf buf;
49 unsigned char c;
50
51 if(ret != NULL)
52 free(ret);
53 bufinit(buf);
54 for(; *text; text++) {
55 c = *text;
56 if(!c < 128 && safechars[(int)c])
57 bufadd(buf, *text);
58 else
59 bprintf(&buf, "%%%02X", (int)c);
60 }
61 bufadd(buf, 0);
62 return(ret = buf.b);
63}
64
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65char *htmlquote(char *text)
66{
3095582d 67 static char *ret = NULL;
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68 struct charbuf buf;
69
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70 if(ret != NULL)
71 free(ret);
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72 bufinit(buf);
73 for(; *text; text++) {
74 if(*text == '<')
75 bufcatstr(buf, "&lt;");
76 else if(*text == '>')
77 bufcatstr(buf, "&gt;");
78 else if(*text == '&')
79 bufcatstr(buf, "&amp;");
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80 else if(*text == '\"')
81 bufcatstr(buf, "&quot;");
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82 else
83 bufadd(buf, *text);
84 }
85 bufadd(buf, 0);
3095582d 86 return(ret = buf.b);
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87}
88
89void simpleerror(int fd, int code, char *msg, char *fmt, ...)
90{
91 struct charbuf buf;
3095582d 92 char *tmp;
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93 va_list args;
94 FILE *out;
95
96 va_start(args, fmt);
3095582d 97 tmp = vsprintf2(fmt, args);
d422fdfd 98 va_end(args);
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99 bufinit(buf);
100 bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n");
101 bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n");
102 bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n");
103 bufcatstr(buf, "<head>\r\n");
104 bprintf(&buf, "<title>%s</title>\r\n", msg);
105 bufcatstr(buf, "</head>\r\n");
106 bufcatstr(buf, "<body>\r\n");
107 bprintf(&buf, "<h1>%s</h1>\r\n", msg);
3095582d 108 bprintf(&buf, "<p>%s</p>\r\n", htmlquote(tmp));
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109 bufcatstr(buf, "</body>\r\n");
110 bufcatstr(buf, "</html>\r\n");
ad1983c4 111 out = fdopen(dup(fd), "w");
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112 fprintf(out, "HTTP/1.1 %i %s\n", code, msg);
113 fprintf(out, "Content-Type: text/html\n");
114 fprintf(out, "Content-Length: %zi\n", buf.d);
115 fprintf(out, "\n");
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116 fwrite(buf.b, 1, buf.d, out);
117 fclose(out);
118 buffree(buf);
119}
b4164ce6 120
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121void stdredir(struct hthead *req, int fd, int code, char *dst)
122{
123 FILE *out;
124 char *sp, *cp, *ep, *path, *url, *adst, *proto, *host;
125
126 sp = strchr(dst, '/');
127 cp = strchr(dst, ':');
128 if(cp && (!sp || (cp < sp))) {
129 adst = sstrdup(dst);
130 } else {
131 proto = getheader(req, "X-Ash-Protocol");
132 host = getheader(req, "Host");
133 if((proto == NULL) || (host == NULL)) {
134 /* Not compliant, but there isn't a whole lot to be done
135 * about it. */
136 adst = sstrdup(dst);
137 } else {
138 if(*dst == '/') {
2f43c22d 139 path = sstrdup(dst + 1);
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140 } else {
141 if((*(url = req->url)) == '/')
142 url++;
143 if((ep = strrchr(url, '/')) != NULL)
144 ep++;
145 else
146 ep = url;
147 path = sprintf2("%.*s%s", ep - url, url, dst);
148 }
149 adst = sprintf2("%s://%s/%s", proto, host, path);
150 free(path);
151 }
152 }
ad1983c4 153 out = fdopen(dup(fd), "w");
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154 fprintf(out, "HTTP/1.1 %i Redirection\n", code);
155 fprintf(out, "Content-Length: 0\n");
156 fprintf(out, "Location: %s\n", adst);
157 fprintf(out, "\n");
158 fclose(out);
159 free(adst);
160}
161
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162char *fmthttpdate(time_t time)
163{
164 /* I avoid using strftime, since it depends on locale settings. */
165 static char *days[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
166 static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
167 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
168 struct tm *tm;
169
170 tm = gmtime(&time);
171 return(sprintf3("%s, %i %s %i %02i:%02i:%02i GMT", days[(tm->tm_wday + 6) % 7], tm->tm_mday, months[tm->tm_mon], tm->tm_year + 1900, tm->tm_hour, tm->tm_min, tm->tm_sec));
172}
173
174time_t parsehttpdate(char *date)
175{
176 static regex_t *spec = NULL;
177 static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
178 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
179 int i;
180 regmatch_t g[11];
181 struct tm tm;
182 int tz;
183
184 int gtoi(regmatch_t g)
185 {
186 int i, n;
187
188 for(i = g.rm_so, n = 0; i < g.rm_eo; i++)
189 n = (n * 10) + (date[i] - '0');
190 return(n);
191 }
192
193 int gstrcmp(regmatch_t g, char *str) {
194 if(g.rm_eo - g.rm_so != strlen(str))
195 return(1);
196 return(strncasecmp(date + g.rm_so, str, g.rm_eo - g.rm_so));
197 }
198
199 if(spec == NULL) {
200 omalloc(spec);
201 if(regcomp(spec, "^[A-Z]{3}, +([0-9]+) +([A-Z]{3}) +([0-9]+) +([0-9]{2}):([0-9]{2}):([0-9]{2}) +(([A-Z]+)|[+-]([0-9]{2})([0-9]{2}))$", REG_EXTENDED | REG_ICASE)) {
202 free(spec);
203 spec = NULL;
204 return(0);
205 }
206 }
207 if(regexec(spec, date, 11, g, 0))
208 return(0);
209 tm.tm_mday = gtoi(g[1]);
210 tm.tm_year = gtoi(g[3]) - 1900;
211 tm.tm_hour = gtoi(g[4]);
212 tm.tm_min = gtoi(g[5]);
213 tm.tm_sec = gtoi(g[6]);
214
215 tm.tm_mon = -1;
216 for(i = 0; i < 12; i++) {
217 if(!gstrcmp(g[2], months[i])) {
218 tm.tm_mon = i;
219 break;
220 }
221 }
222 if(tm.tm_mon < 0)
223 return(0);
224
225 if(g[8].rm_so > 0) {
226 if(!gstrcmp(g[8], "GMT"))
227 tz = 0;
228 else
229 return(0);
230 } else if((g[9].rm_so > 0) && (g[10].rm_so > 0)) {
231 tz = gtoi(g[9]) * 3600 + gtoi(g[10]) * 60;
232 if(date[g[7].rm_so] == '-')
233 tz = -tz;
234 } else {
235 return(0);
236 }
237
238 return(timegm(&tm) - tz);
239}