source: MondoRescue/branches/2.2.5/mindi-busybox/networking/httpd_indexcgi.c

Last change on this file was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 9.6 KB
Line 
1/*
2 * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
3 *
4 * Licensed under GPLv2, see file LICENSE in this tarball for details.
5 */
6
7/*
8 * This program is a CGI application. It outputs directory index page.
9 * Put it into cgi-bin/index.cgi and chmod 0755.
10 */
11
12/* Build a-la
13i486-linux-uclibc-gcc \
14-static -static-libgcc \
15-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
16-Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \
17-Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \
18-Wmissing-prototypes -Wmissing-declarations \
19-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \
20-ffunction-sections -fdata-sections -fno-guess-branch-probability \
21-funsigned-char \
22-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \
23-march=i386 -mpreferred-stack-boundary=2 \
24-Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
25httpd_indexcgi.c -o index.cgi
26*/
27
28/* We don't use printf, as it pulls in >12 kb of code from uclibc (i386). */
29/* Currently malloc machinery is the biggest part of libc we pull in. */
30/* We have only one realloc and one strdup, any idea how to do without? */
31/* Size (i386, approximate):
32 * text data bss dec hex filename
33 * 13036 44 3052 16132 3f04 index.cgi
34 * 2576 4 2048 4628 1214 index.cgi.o
35 */
36
37#include <sys/types.h>
38#include <sys/stat.h>
39#include <errno.h>
40#include <stdint.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44#include <stdio.h>
45#include <dirent.h>
46#include <time.h>
47
48/* Appearance of the table is controlled by style sheet *ONLY*,
49 * formatting code uses <TAG class=CLASS> to apply style
50 * to elements. Edit stylesheet to your liking and recompile. */
51
52#define STYLE_STR \
53"<style>" "\n"\
54"table {" "\n"\
55 "width:100%;" "\n"\
56 "background-color:#fff5ee;" "\n"\
57 "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
58 "border-spacing:2px;" "\n"\
59 "border-style:solid;" /* solid solid solid solid; */ "\n"\
60 "border-color:black;" /* black black black black; */ "\n"\
61 "border-collapse:collapse;" "\n"\
62"}" "\n"\
63"th {" "\n"\
64 "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
65 "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
66 "border-style:solid;" /* solid solid solid solid; */ "\n"\
67 "border-color:black;" /* black black black black; */ "\n"\
68"}" "\n"\
69"td {" "\n"\
70 /* top right bottom left */ \
71 "border-width:0px 1px 0px 1px;" "\n"\
72 "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
73 "border-style:solid;" /* solid solid solid solid; */ "\n"\
74 "border-color:black;" /* black black black black; */ "\n"\
75 "white-space:nowrap;" "\n"\
76"}" "\n"\
77"tr.hdr { background-color:#eee5de; }" "\n"\
78"tr.o { background-color:#ffffff; }" "\n"\
79/* tr.e { ... } - for even rows (currently none) */ \
80"tr.foot { background-color:#eee5de; }" "\n"\
81"th.cnt { text-align:left; }" "\n"\
82"th.sz { text-align:right; }" "\n"\
83"th.dt { text-align:right; }" "\n"\
84"td.sz { text-align:right; }" "\n"\
85"td.dt { text-align:right; }" "\n"\
86"col.nm { width:98%; }" "\n"\
87"col.sz { width:1%; }" "\n"\
88"col.dt { width:1%; }" "\n"\
89"</style>" "\n"\
90
91typedef struct dir_list_t {
92 char *dl_name;
93 mode_t dl_mode;
94 off_t dl_size;
95 time_t dl_mtime;
96} dir_list_t;
97
98static int compare_dl(dir_list_t *a, dir_list_t *b)
99{
100 /* ".." is 'less than' any other dir entry */
101 if (strcmp(a->dl_name, "..") == 0) {
102 return -1;
103 }
104 if (strcmp(b->dl_name, "..") == 0) {
105 return 1;
106 }
107 if (S_ISDIR(a->dl_mode) != S_ISDIR(b->dl_mode)) {
108 /* 1 if b is a dir (and thus a is 'after' b, a > b),
109 * else -1 (a < b) */
110 return (S_ISDIR(b->dl_mode) != 0) ? 1 : -1;
111 }
112 return strcmp(a->dl_name, b->dl_name);
113}
114
115static char buffer[2*1024 > sizeof(STYLE_STR) ? 2*1024 : sizeof(STYLE_STR)];
116static char *dst = buffer;
117enum {
118 BUFFER_SIZE = sizeof(buffer),
119 HEADROOM = 64,
120};
121
122/* After this call, you have at least size + HEADROOM bytes available
123 * ahead of dst */
124static void guarantee(int size)
125{
126 if (buffer + (BUFFER_SIZE-HEADROOM) - dst >= size)
127 return;
128 write(1, buffer, dst - buffer);
129 dst = buffer;
130}
131
132/* NB: formatters do not store terminating NUL! */
133
134/* HEADROOM bytes are available after dst after this call */
135static void fmt_str(/*char *dst,*/ const char *src)
136{
137 unsigned len = strlen(src);
138 guarantee(len);
139 memcpy(dst, src, len);
140 dst += len;
141}
142
143/* HEADROOM bytes after dst are available after this call */
144static void fmt_url(/*char *dst,*/ const char *name)
145{
146 while (*name) {
147 unsigned c = *name++;
148 guarantee(3);
149 *dst = c;
150 if ((c - '0') > 9 /* not a digit */
151 && ((c|0x20) - 'a') > 26 /* not A-Z or a-z */
152 && !strchr("._-+@", c)
153 ) {
154 *dst++ = '%';
155 *dst++ = "0123456789ABCDEF"[c >> 4];
156 *dst = "0123456789ABCDEF"[c & 0xf];
157 }
158 dst++;
159 }
160}
161
162/* HEADROOM bytes are available after dst after this call */
163static void fmt_html(/*char *dst,*/ const char *name)
164{
165 while (*name) {
166 char c = *name++;
167 if (c == '<')
168 fmt_str("&lt;");
169 else if (c == '>')
170 fmt_str("&gt;");
171 else if (c == '&') {
172 fmt_str("&amp;");
173 } else {
174 guarantee(1);
175 *dst++ = c;
176 continue;
177 }
178 }
179}
180
181/* HEADROOM bytes are available after dst after this call */
182static void fmt_ull(/*char *dst,*/ unsigned long long n)
183{
184 char buf[sizeof(n)*3 + 2];
185 char *p;
186
187 p = buf + sizeof(buf) - 1;
188 *p = '\0';
189 do {
190 *--p = (n % 10) + '0';
191 n /= 10;
192 } while (n);
193 fmt_str(/*dst,*/ p);
194}
195
196/* Does not call guarantee - eats into headroom instead */
197static void fmt_02u(/*char *dst,*/ unsigned n)
198{
199 /* n %= 100; - not needed, callers don't pass big n */
200 dst[0] = (n / 10) + '0';
201 dst[1] = (n % 10) + '0';
202 dst += 2;
203}
204
205/* Does not call guarantee - eats into headroom instead */
206static void fmt_04u(/*char *dst,*/ unsigned n)
207{
208 /* n %= 10000; - not needed, callers don't pass big n */
209 fmt_02u(n / 100);
210 fmt_02u(n % 100);
211}
212
213int main(void)
214{
215 dir_list_t *dir_list;
216 dir_list_t *cdir;
217 unsigned dir_list_count;
218 unsigned count_dirs;
219 unsigned count_files;
220 unsigned long long size_total;
221 int odd;
222 DIR *dirp;
223 char *QUERY_STRING;
224
225 QUERY_STRING = getenv("QUERY_STRING");
226 if (!QUERY_STRING
227 || QUERY_STRING[0] != '/'
228 || strstr(QUERY_STRING, "/../")
229 || strcmp(strrchr(QUERY_STRING, '/'), "/..") == 0
230 ) {
231 return 1;
232 }
233
234 if (chdir("..")
235 || (QUERY_STRING[1] && chdir(QUERY_STRING + 1))
236 ) {
237 return 1;
238 }
239
240 dirp = opendir(".");
241 if (!dirp)
242 return 1;
243 dir_list = NULL;
244 dir_list_count = 0;
245 while (1) {
246 struct dirent *dp;
247 struct stat sb;
248
249 dp = readdir(dirp);
250 if (!dp)
251 break;
252 if (dp->d_name[0] == '.' && !dp->d_name[1])
253 continue;
254 if (stat(dp->d_name, &sb) != 0)
255 continue;
256 dir_list = realloc(dir_list, (dir_list_count + 1) * sizeof(dir_list[0]));
257 dir_list[dir_list_count].dl_name = strdup(dp->d_name);
258 dir_list[dir_list_count].dl_mode = sb.st_mode;
259 dir_list[dir_list_count].dl_size = sb.st_size;
260 dir_list[dir_list_count].dl_mtime = sb.st_mtime;
261 dir_list_count++;
262 }
263 closedir(dirp);
264
265 qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl);
266
267 fmt_str(
268 "" /* Additional headers (currently none) */
269 "\r\n" /* Mandatory empty line after headers */
270 "<html><head><title>Index of ");
271 /* Guard against directories with &, > etc */
272 fmt_html(QUERY_STRING);
273 fmt_str(
274 "</title>\n"
275 STYLE_STR
276 "</head>" "\n"
277 "<body>" "\n"
278 "<h1>Index of ");
279 fmt_html(QUERY_STRING);
280 fmt_str(
281 "</h1>" "\n"
282 "<table>" "\n"
283 "<col class=nm><col class=sz><col class=dt>" "\n"
284 "<tr class=hdr><th class=cnt>Name<th class=sz>Size<th class=dt>Last modified" "\n");
285
286 odd = 0;
287 count_dirs = 0;
288 count_files = 0;
289 size_total = 0;
290 cdir = dir_list;
291 while (dir_list_count--) {
292 struct tm *tm;
293
294 if (S_ISDIR(cdir->dl_mode)) {
295 count_dirs++;
296 } else if (S_ISREG(cdir->dl_mode)) {
297 count_files++;
298 size_total += cdir->dl_size;
299 } else
300 goto next;
301
302 fmt_str("<tr class=");
303 *dst++ = (odd ? 'o' : 'e');
304 fmt_str("><td class=nm><a href='");
305 fmt_url(cdir->dl_name); /* %20 etc */
306 if (S_ISDIR(cdir->dl_mode))
307 *dst++ = '/';
308 fmt_str("'>");
309 fmt_html(cdir->dl_name); /* &lt; etc */
310 if (S_ISDIR(cdir->dl_mode))
311 *dst++ = '/';
312 fmt_str("</a><td class=sz>");
313 if (S_ISREG(cdir->dl_mode))
314 fmt_ull(cdir->dl_size);
315 fmt_str("<td class=dt>");
316 tm = gmtime(&cdir->dl_mtime);
317 fmt_04u(1900 + tm->tm_year); *dst++ = '-';
318 fmt_02u(tm->tm_mon + 1); *dst++ = '-';
319 fmt_02u(tm->tm_mday); *dst++ = ' ';
320 fmt_02u(tm->tm_hour); *dst++ = ':';
321 fmt_02u(tm->tm_min); *dst++ = ':';
322 fmt_02u(tm->tm_sec);
323 *dst++ = '\n';
324
325 odd = 1 - odd;
326 next:
327 cdir++;
328 }
329
330 fmt_str("<tr class=foot><th class=cnt>Files: ");
331 fmt_ull(count_files);
332 /* count_dirs - 1: we don't want to count ".." */
333 fmt_str(", directories: ");
334 fmt_ull(count_dirs - 1);
335 fmt_str("<th class=sz>");
336 fmt_ull(size_total);
337 fmt_str("<th class=dt>\n");
338 /* "</table></body></html>" - why bother? */
339 guarantee(BUFFER_SIZE * 2); /* flush */
340
341 return 0;
342}
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