/[mod_czs]/mod_czs.c
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Revision 1.14 - (show annotations)
Sun Aug 13 20:14:52 2000 UTC (21 years, 1 month ago) by dpavlin
Branch: MAIN
CVS Tags: HEAD
Changes since 1.13: +3 -3 lines
File MIME type: text/plain
better check for null values to prevent concat of headers

1 /*
2 * mod_czs -- nuke iso8859-2 characters
3 * sets `Contnet-type: text/html; charset=foobar' based on user agent string
4 * from client browser
5 *
6 * Dobrica Pavlinusic <dpavlin@rot13.org>
7 * Robert Avilov <ravilov@linux.hr> (some fixes of ua_charset part)
8 *
9 * based on mod_format by Stephen F. Booth and
10 * mod_mocrify by Peter Triller, Ernst Bachmann
11 *
12 * Usage: httpd.conf
13 * AddHandler czs .html
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 */
29
30 #include "httpd.h"
31 #include "http_main.h"
32 #include "http_config.h"
33 #include "http_log.h"
34 #include "http_protocol.h"
35
36 module MODULE_VAR_EXPORT mod_czs;
37
38 FILE *in;
39
40 static int czs_handler(request_rec *r) {
41
42 char buffer[MAX_STRING_LEN] = "undefined buffer content";
43 char *b,*do_czs,*do_mac;
44 char *rexp = "< *META *HTTP-EQUIV=\"(Content-Type)\" *CONTENT=\"(text/html[^\"]+)\" *>";
45 regex_t *regexp;
46 int nsub = 10;
47 regmatch_t regm[10];
48 int i,f_ch=MAX_STRING_LEN,l_ch=0;
49
50 if(r->method_number != M_GET)
51 return DECLINED;
52 if(r->finfo.st_mode == 0)
53 return NOT_FOUND;
54
55 do_czs = (char *)ap_table_get(r->notes,"do_czs");
56 do_mac = (char *)ap_table_get(r->notes,"do_mac");
57
58 in = ap_pfopen(r->pool, r->filename, "r");
59
60 if(in == NULL) {
61 ap_log_reason("file permissions deny server access", r->filename, r);
62 return FORBIDDEN;
63 }
64 #ifdef DEBUG
65 ap_table_setn(r->headers_out, "X-czs_filename", r->filename);
66 if (r->args != 0) {
67 ap_table_setn(r->headers_out, "X-czs_args", r->args);
68 }
69 if (do_czs) ap_table_setn(r->headers_out, "X-do_czs", do_czs);
70 if (do_mac) ap_table_setn(r->headers_out, "X-do_mac", do_mac);
71 ap_table_setn(r->headers_out, "X-content-type", r->content_type);
72 #endif
73
74 #ifdef TEST_QUERYSTRINGV
75 if (r->args == 0 && do_czs == NULL && do_mac == NULL || ap_strcasestr(r->content_type,"cgi") != NULL) {
76 #else
77 if (do_czs == NULL && do_mac == NULL || ap_strcasestr(r->content_type,"cgi") != NULL) {
78 #endif
79 return DECLINED;
80 /* ap_send_fd(in, r); */
81 } else {
82
83 regexp = ap_pregcomp(r->pool, rexp, REG_EXTENDED | REG_ICASE );
84
85 if (regexp == NULL) {
86 ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
87 "unable to compile pattern \"%s\"", rexp);
88 return DECLINED;
89 }
90
91 ap_soft_timeout("send", r);
92 ap_send_http_header(r);
93
94 if(r->header_only) {
95 ap_kill_timeout(r);
96 ap_pfclose(r->pool, in);
97 return OK;
98 }
99
100
101 while(fgets(buffer,MAX_STRING_LEN,in)) {
102 if (do_czs != NULL) {
103 for(i=0; i<MAX_STRING_LEN && buffer[i]; i++) {
104 switch ( buffer[i] ) {
105 case '¹': buffer[i]='s'; break;
106 case 'ð': buffer[i]='d'; break;
107 case 'è': buffer[i]='c'; break;
108 case 'æ': buffer[i]='c'; break;
109 case '¾': buffer[i]='z'; break;
110 case '©': buffer[i]='S'; break;
111 case 'Ð': buffer[i]='D'; break;
112 case 'È': buffer[i]='C'; break;
113 case 'Æ': buffer[i]='C'; break;
114 case '®': buffer[i]='Z'; break;
115 }
116 }
117 }
118
119
120 if (ap_regexec(regexp, buffer, nsub, regm, 0) == 0) {
121 #if 0
122 ap_rprintf(r,"<!-- num replacements: %02x buffer:\n%s\n",nsub,buffer);
123 ap_rprintf(r,"\n-->\n",i,regm[i].rm_so,regm[i].rm_eo);
124 #endif
125 for (i=0; i<10; i++) {
126 if (regm[i].rm_so != -1) {
127 if (regm[i].rm_so < f_ch)
128 f_ch = regm[i].rm_so;
129 if (regm[i].rm_eo > l_ch)
130 l_ch = regm[i].rm_eo;
131 }
132 #if 0
133 ap_rprintf(r,"<!-- %02x: %02x-%02x -->\n",i,regm[i].rm_so,regm[i].rm_eo);
134 #endif
135 }
136 buffer[f_ch]=0;
137 ap_rprintf(r,"%s", ap_pstrcat(r->pool, buffer,"<!-- removed charset -->", buffer+l_ch, NULL));
138 } else {
139 ap_rprintf(r,"%s",buffer);
140 }
141 }
142 /* ap_pregfree(r->pool, regexp); */
143 }
144
145 ap_kill_timeout(r);
146 ap_pfclose(r->pool, in);
147 return OK;
148 }
149
150 int translate_path(request_rec *r) {
151 char *uri = r->uri;
152 request_rec *subr;
153 char *ct;
154 char *ua;
155
156 #ifdef DEBUG
157 ap_table_setn(r->headers_out, "X-translate-uri", r->uri);
158 #endif
159
160 if (uri[0]=='/' && (uri[1] | 0x20) =='c' && (uri[2] | 0x20)=='z' && (uri[3] | 0x20) =='s' && uri[4]=='/') {
161 subr = (request_rec *) ap_sub_req_lookup_uri(r->uri+4, r);
162 r->filename=ap_pstrdup(r->pool, subr->filename);
163 ct = (char *)subr->content_type;
164 if (ct == NULL) return DECLINED; /* hm? */
165 #ifdef DEBUG
166 ap_table_setn(r->headers_out, "X-translate-sub-ct", ct);
167 #endif
168 ap_table_setn(r->notes,"do_czs",ap_pstrdup(r->pool,"1"));
169 ap_destroy_sub_req(subr);
170 return OK;
171 }
172
173 ua = (char *)ap_table_get(r->headers_in, "User-Agent");
174 if (ua == NULL) ua = "unknown";
175
176 #ifdef DEBUG
177 ap_table_setn(r->headers_out, "X-translate-UA", ua);
178 #endif
179
180 if (uri[0]=='/' && (uri[1] | 0x20) =='m' && (uri[2] | 0x20)=='a' && (uri[3] | 0x20) =='c' && uri[4]=='/') {
181 subr = (request_rec *) ap_sub_req_lookup_uri(r->uri+4, r);
182 r->filename=ap_pstrdup(r->pool, subr->filename);
183 ct = (char *)subr->content_type;
184 if (ct == NULL) return DECLINED; /* hm? */
185 #ifdef DEBUG
186 ap_table_setn(r->headers_out, "X-translate-sub-ct", ct);
187 #endif
188 /* will store User-Agent in do_mac as true value */
189 if (ap_strcasestr(ua, "Mac"))
190 ap_table_setn(r->notes,"do_mac",ua);
191 else {
192 ap_table_setn(r->headers_out, "Location", r->uri+4);
193 return REDIRECT;
194 }
195 ap_destroy_sub_req(subr);
196 return OK;
197 }
198
199 #if 0
200 if (ap_strcasestr(ua, "Mac")) {
201 ap_table_setn(r->headers_out, "Location", ap_pstrcat(r->pool, "/mac/", r->uri, NULL));
202 return REDIRECT;
203 }
204 #endif
205
206 return DECLINED;
207 }
208
209 static int add_charset_header(request_rec * r)
210 {
211 char *ua, *ct;
212
213 ua = (char *)ap_table_get(r->notes, "do_mac");
214 ct = (char *)r->content_type;
215
216 if (ct != NULL && !ap_table_get(r->notes,"do_czs")) {
217
218 if (ap_strcasestr(ct, "text") == NULL)
219 return DECLINED; /* Don't mess with other types */
220
221 if (ua) { /* do_mac */
222 if (ap_strcasestr(ua, "MSIE") != NULL)
223 r->content_type = ap_pstrcat(r->pool, ct,"; charset=x-mac-roman", NULL);
224 else
225 r->content_type = ap_pstrcat(r->pool, ct,"; charset=MacCE", NULL);
226 } else
227 r->content_type = ap_pstrcat(r->pool, ct,"; charset=iso-8859-2", NULL);
228 }
229
230 #ifdef DEBUG
231 ap_table_setn(r->headers_out, "X-Content-Type", ct);
232 ap_table_setn(r->headers_out, "X-new-Content-Type", r->content_type);
233 if (ua) ap_table_setn(r->headers_out, "X-User-Agent", ua);
234 #endif
235 return DECLINED;
236 }
237
238
239 /* Dispatch list of content handlers */
240 static const handler_rec czs_handlers[] = {
241 { "czs", czs_handler },
242 { NULL, NULL }
243 };
244
245 /* Dispatch list for API hooks */
246 module MODULE_VAR_EXPORT czs_module = {
247 STANDARD_MODULE_STUFF,
248 NULL, /* module initializer */
249 NULL, /* create per-dir config structures */
250 NULL, /* merge per-dir config structures */
251 NULL, /* create per-server config structures */
252 NULL, /* merge per-server config structures */
253 NULL, /* table of config file commands */
254 czs_handlers, /* [#8] MIME-typed-dispatched handlers */
255 translate_path, /* [#1] URI to filename translation */
256 NULL, /* [#4] validate user id from request */
257 NULL, /* [#5] check if the user is ok _here_ */
258 NULL, /* [#2] check access by host address */
259 NULL, /* [#6] determine MIME type */
260 add_charset_header, /* [#7] pre-run fixups */
261 NULL, /* [#9] log a transaction */
262 NULL, /* [#3] header parser */
263 NULL, /* child_init */
264 NULL, /* child_exit */
265 NULL /* [#0] post read-request */
266 #ifdef EAPI
267 ,NULL, /* EAPI: add_module */
268 NULL, /* EAPI: remove_module */
269 NULL, /* EAPI: rewrite_command */
270 NULL /* EAPI: new_connection */
271 #endif
272 };
273

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