blob: 562cd7fbef495b0102763bf032cb5134833937b4
1 | /* |
2 | * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com> |
3 | * |
4 | * Licensed under GPLv2, see file LICENSE in this source tree. |
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 | |
32 | /* Size (i386, static uclibc, approximate): |
33 | * text data bss dec hex filename |
34 | * 13036 44 3052 16132 3f04 index.cgi |
35 | * 2576 4 2048 4628 1214 index.cgi.o |
36 | */ |
37 | |
38 | #define _GNU_SOURCE 1 /* for strchrnul */ |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> |
41 | #include <errno.h> |
42 | #include <stdint.h> |
43 | #include <stdlib.h> |
44 | #include <string.h> |
45 | #include <unistd.h> |
46 | #include <stdio.h> |
47 | #include <dirent.h> |
48 | #include <time.h> |
49 | |
50 | /* Appearance of the table is controlled by style sheet *ONLY*, |
51 | * formatting code uses <TAG class=CLASS> to apply style |
52 | * to elements. Edit stylesheet to your liking and recompile. */ |
53 | |
54 | #define STYLE_STR \ |
55 | "<style>" "\n"\ |
56 | "table {" "\n"\ |
57 | "width:100%;" "\n"\ |
58 | "background-color:#fff5ee;" "\n"\ |
59 | "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\ |
60 | "border-spacing:2px;" "\n"\ |
61 | "border-style:solid;" /* solid solid solid solid; */ "\n"\ |
62 | "border-color:black;" /* black black black black; */ "\n"\ |
63 | "border-collapse:collapse;" "\n"\ |
64 | "}" "\n"\ |
65 | "th {" "\n"\ |
66 | "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\ |
67 | "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\ |
68 | "border-style:solid;" /* solid solid solid solid; */ "\n"\ |
69 | "border-color:black;" /* black black black black; */ "\n"\ |
70 | "}" "\n"\ |
71 | "td {" "\n"\ |
72 | /* top right bottom left */ \ |
73 | "border-width:0px 1px 0px 1px;" "\n"\ |
74 | "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\ |
75 | "border-style:solid;" /* solid solid solid solid; */ "\n"\ |
76 | "border-color:black;" /* black black black black; */ "\n"\ |
77 | "white-space:nowrap;" "\n"\ |
78 | "}" "\n"\ |
79 | "tr.hdr { background-color:#eee5de; }" "\n"\ |
80 | "tr.o { background-color:#ffffff; }" "\n"\ |
81 | /* tr.e { ... } - for even rows (currently none) */ \ |
82 | "tr.foot { background-color:#eee5de; }" "\n"\ |
83 | "th.cnt { text-align:left; }" "\n"\ |
84 | "th.sz { text-align:right; }" "\n"\ |
85 | "th.dt { text-align:right; }" "\n"\ |
86 | "td.sz { text-align:right; }" "\n"\ |
87 | "td.dt { text-align:right; }" "\n"\ |
88 | "col.nm { width:98%; }" "\n"\ |
89 | "col.sz { width:1%; }" "\n"\ |
90 | "col.dt { width:1%; }" "\n"\ |
91 | "</style>" "\n"\ |
92 | |
93 | typedef struct dir_list_t { |
94 | char *dl_name; |
95 | mode_t dl_mode; |
96 | off_t dl_size; |
97 | time_t dl_mtime; |
98 | } dir_list_t; |
99 | |
100 | static int compare_dl(dir_list_t *a, dir_list_t *b) |
101 | { |
102 | /* ".." is 'less than' any other dir entry */ |
103 | if (strcmp(a->dl_name, "..") == 0) { |
104 | return -1; |
105 | } |
106 | if (strcmp(b->dl_name, "..") == 0) { |
107 | return 1; |
108 | } |
109 | if (S_ISDIR(a->dl_mode) != S_ISDIR(b->dl_mode)) { |
110 | /* 1 if b is a dir (and thus a is 'after' b, a > b), |
111 | * else -1 (a < b) */ |
112 | return (S_ISDIR(b->dl_mode) != 0) ? 1 : -1; |
113 | } |
114 | return strcmp(a->dl_name, b->dl_name); |
115 | } |
116 | |
117 | static char buffer[2*1024 > sizeof(STYLE_STR) ? 2*1024 : sizeof(STYLE_STR)]; |
118 | static char *dst = buffer; |
119 | enum { |
120 | BUFFER_SIZE = sizeof(buffer), |
121 | HEADROOM = 64, |
122 | }; |
123 | |
124 | /* After this call, you have at least size + HEADROOM bytes available |
125 | * ahead of dst */ |
126 | static void guarantee(int size) |
127 | { |
128 | if (buffer + (BUFFER_SIZE-HEADROOM) - dst >= size) |
129 | return; |
130 | write(STDOUT_FILENO, buffer, dst - buffer); |
131 | dst = buffer; |
132 | } |
133 | |
134 | /* NB: formatters do not store terminating NUL! */ |
135 | |
136 | /* HEADROOM bytes are available after dst after this call */ |
137 | static void fmt_str(/*char *dst,*/ const char *src) |
138 | { |
139 | unsigned len = strlen(src); |
140 | guarantee(len); |
141 | memcpy(dst, src, len); |
142 | dst += len; |
143 | } |
144 | |
145 | /* HEADROOM bytes after dst are available after this call */ |
146 | static void fmt_url(/*char *dst,*/ const char *name) |
147 | { |
148 | while (*name) { |
149 | unsigned c = *name++; |
150 | guarantee(3); |
151 | *dst = c; |
152 | if ((c - '0') > 9 /* not a digit */ |
153 | && ((c|0x20) - 'a') > ('z' - 'a') /* not A-Z or a-z */ |
154 | && !strchr("._-+@", c) |
155 | ) { |
156 | *dst++ = '%'; |
157 | *dst++ = "0123456789ABCDEF"[c >> 4]; |
158 | *dst = "0123456789ABCDEF"[c & 0xf]; |
159 | } |
160 | dst++; |
161 | } |
162 | } |
163 | |
164 | /* HEADROOM bytes are available after dst after this call */ |
165 | static void fmt_html(/*char *dst,*/ const char *name) |
166 | { |
167 | while (*name) { |
168 | char c = *name++; |
169 | if (c == '<') |
170 | fmt_str("<"); |
171 | else if (c == '>') |
172 | fmt_str(">"); |
173 | else if (c == '&') { |
174 | fmt_str("&"); |
175 | } else { |
176 | guarantee(1); |
177 | *dst++ = c; |
178 | continue; |
179 | } |
180 | } |
181 | } |
182 | |
183 | /* HEADROOM bytes are available after dst after this call */ |
184 | static void fmt_ull(/*char *dst,*/ unsigned long long n) |
185 | { |
186 | char buf[sizeof(n)*3 + 2]; |
187 | char *p; |
188 | |
189 | p = buf + sizeof(buf) - 1; |
190 | *p = '\0'; |
191 | do { |
192 | *--p = (n % 10) + '0'; |
193 | n /= 10; |
194 | } while (n); |
195 | fmt_str(/*dst,*/ p); |
196 | } |
197 | |
198 | /* Does not call guarantee - eats into headroom instead */ |
199 | static void fmt_02u(/*char *dst,*/ unsigned n) |
200 | { |
201 | /* n %= 100; - not needed, callers don't pass big n */ |
202 | dst[0] = (n / 10) + '0'; |
203 | dst[1] = (n % 10) + '0'; |
204 | dst += 2; |
205 | } |
206 | |
207 | /* Does not call guarantee - eats into headroom instead */ |
208 | static void fmt_04u(/*char *dst,*/ unsigned n) |
209 | { |
210 | /* n %= 10000; - not needed, callers don't pass big n */ |
211 | fmt_02u(n / 100); |
212 | fmt_02u(n % 100); |
213 | } |
214 | |
215 | int main(int argc, char *argv[]) |
216 | { |
217 | dir_list_t *dir_list; |
218 | dir_list_t *cdir; |
219 | unsigned dir_list_count; |
220 | unsigned count_dirs; |
221 | unsigned count_files; |
222 | unsigned long long size_total; |
223 | int odd; |
224 | DIR *dirp; |
225 | char *location; |
226 | |
227 | location = getenv("REQUEST_URI"); |
228 | if (!location) |
229 | return 1; |
230 | |
231 | /* drop URL arguments if any */ |
232 | strchrnul(location, '?')[0] = '\0'; |
233 | |
234 | if (location[0] != '/' |
235 | || strstr(location, "//") |
236 | || strstr(location, "/../") |
237 | || strcmp(strrchr(location, '/'), "/..") == 0 |
238 | ) { |
239 | return 1; |
240 | } |
241 | |
242 | if (chdir("..") |
243 | || (location[1] && chdir(location + 1)) |
244 | ) { |
245 | return 1; |
246 | } |
247 | |
248 | dirp = opendir("."); |
249 | if (!dirp) |
250 | return 1; |
251 | dir_list = NULL; |
252 | dir_list_count = 0; |
253 | while (1) { |
254 | struct dirent *dp; |
255 | struct stat sb; |
256 | |
257 | dp = readdir(dirp); |
258 | if (!dp) |
259 | break; |
260 | if (dp->d_name[0] == '.' && !dp->d_name[1]) |
261 | continue; |
262 | if (stat(dp->d_name, &sb) != 0) |
263 | continue; |
264 | dir_list = realloc(dir_list, (dir_list_count + 1) * sizeof(dir_list[0])); |
265 | dir_list[dir_list_count].dl_name = strdup(dp->d_name); |
266 | dir_list[dir_list_count].dl_mode = sb.st_mode; |
267 | dir_list[dir_list_count].dl_size = sb.st_size; |
268 | dir_list[dir_list_count].dl_mtime = sb.st_mtime; |
269 | dir_list_count++; |
270 | } |
271 | closedir(dirp); |
272 | |
273 | qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl); |
274 | |
275 | fmt_str( |
276 | "" /* Additional headers (currently none) */ |
277 | "\r\n" /* Mandatory empty line after headers */ |
278 | "<html><head><title>Index of "); |
279 | /* Guard against directories with &, > etc */ |
280 | fmt_html(location); |
281 | fmt_str( |
282 | "</title>\n" |
283 | STYLE_STR |
284 | "</head>" "\n" |
285 | "<body>" "\n" |
286 | "<h1>Index of "); |
287 | fmt_html(location); |
288 | fmt_str( |
289 | "</h1>" "\n" |
290 | "<table>" "\n" |
291 | "<col class=nm><col class=sz><col class=dt>" "\n" |
292 | "<tr class=hdr><th class=cnt>Name<th class=sz>Size<th class=dt>Last modified" "\n"); |
293 | |
294 | odd = 0; |
295 | count_dirs = 0; |
296 | count_files = 0; |
297 | size_total = 0; |
298 | cdir = dir_list; |
299 | while (dir_list_count--) { |
300 | struct tm *ptm; |
301 | |
302 | if (S_ISDIR(cdir->dl_mode)) { |
303 | count_dirs++; |
304 | } else if (S_ISREG(cdir->dl_mode)) { |
305 | count_files++; |
306 | size_total += cdir->dl_size; |
307 | } else |
308 | goto next; |
309 | |
310 | fmt_str("<tr class="); |
311 | *dst++ = (odd ? 'o' : 'e'); |
312 | fmt_str("><td class=nm><a href='"); |
313 | fmt_url(cdir->dl_name); /* %20 etc */ |
314 | if (S_ISDIR(cdir->dl_mode)) |
315 | *dst++ = '/'; |
316 | fmt_str("'>"); |
317 | fmt_html(cdir->dl_name); /* < etc */ |
318 | if (S_ISDIR(cdir->dl_mode)) |
319 | *dst++ = '/'; |
320 | fmt_str("</a><td class=sz>"); |
321 | if (S_ISREG(cdir->dl_mode)) |
322 | fmt_ull(cdir->dl_size); |
323 | fmt_str("<td class=dt>"); |
324 | ptm = gmtime(&cdir->dl_mtime); |
325 | fmt_04u(1900 + ptm->tm_year); *dst++ = '-'; |
326 | fmt_02u(ptm->tm_mon + 1); *dst++ = '-'; |
327 | fmt_02u(ptm->tm_mday); *dst++ = ' '; |
328 | fmt_02u(ptm->tm_hour); *dst++ = ':'; |
329 | fmt_02u(ptm->tm_min); *dst++ = ':'; |
330 | fmt_02u(ptm->tm_sec); |
331 | *dst++ = '\n'; |
332 | |
333 | odd = 1 - odd; |
334 | next: |
335 | cdir++; |
336 | } |
337 | |
338 | fmt_str("<tr class=foot><th class=cnt>Files: "); |
339 | fmt_ull(count_files); |
340 | /* count_dirs - 1: we don't want to count ".." */ |
341 | fmt_str(", directories: "); |
342 | fmt_ull(count_dirs - 1); |
343 | fmt_str("<th class=sz>"); |
344 | fmt_ull(size_total); |
345 | fmt_str("<th class=dt>\n"); |
346 | /* "</table></body></html>" - why bother? */ |
347 | guarantee(BUFFER_SIZE * 2); /* flush */ |
348 | |
349 | return 0; |
350 | } |
351 |