Contents of /tags/mkinitrd-6_1_2/busybox/networking/httpd_indexcgi.c
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
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File size: 9813 byte(s)
Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 9813 byte(s)
tagged 'mkinitrd-6_1_2'
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 |
13 | i486-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 \ |
25 | httpd_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 | |
91 | typedef 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 | |
98 | static 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 | |
115 | static char buffer[2*1024 > sizeof(STYLE_STR) ? 2*1024 : sizeof(STYLE_STR)]; |
116 | static char *dst = buffer; |
117 | enum { |
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 */ |
124 | static void guarantee(int size) |
125 | { |
126 | if (buffer + (BUFFER_SIZE-HEADROOM) - dst >= size) |
127 | return; |
128 | write(STDOUT_FILENO, 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 */ |
135 | static 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 */ |
144 | static 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 */ |
163 | static void fmt_html(/*char *dst,*/ const char *name) |
164 | { |
165 | while (*name) { |
166 | char c = *name++; |
167 | if (c == '<') |
168 | fmt_str("<"); |
169 | else if (c == '>') |
170 | fmt_str(">"); |
171 | else if (c == '&') { |
172 | fmt_str("&"); |
173 | } else { |
174 | guarantee(1); |
175 | *dst++ = c; |
176 | continue; |
177 | } |
178 | } |
179 | } |
180 | |
181 | /* HEADROOM bytes are available after dst after this call */ |
182 | static 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 */ |
197 | static 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 */ |
206 | static 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 | |
213 | int 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); /* < 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 | } |