2 * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
4 * Licensed under GPLv2, see file LICENSE in this source tree.
8 * This program is a CGI application. It outputs directory index page.
9 * Put it into cgi-bin/index.cgi and chmod 0755.
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 \
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
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? */
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
38 #define _GNU_SOURCE 1 /* for strchrnul */
39 #include <sys/types.h>
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. */
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"\
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"\
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"\
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"\
93 typedef struct dir_list_t {
100 static int compare_dl(dir_list_t
*a
, dir_list_t
*b
)
102 /* ".." is 'less than' any other dir entry */
103 if (strcmp(a
->dl_name
, "..") == 0) {
106 if (strcmp(b
->dl_name
, "..") == 0) {
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),
112 return (S_ISDIR(b
->dl_mode
) != 0) ? 1 : -1;
114 return strcmp(a
->dl_name
, b
->dl_name
);
117 static char buffer
[2*1024 > sizeof(STYLE_STR
) ? 2*1024 : sizeof(STYLE_STR
)];
118 static char *dst
= buffer
;
120 BUFFER_SIZE
= sizeof(buffer
),
124 /* After this call, you have at least size + HEADROOM bytes available
126 static void guarantee(int size
)
128 if (buffer
+ (BUFFER_SIZE
-HEADROOM
) - dst
>= size
)
130 write(STDOUT_FILENO
, buffer
, dst
- buffer
);
134 /* NB: formatters do not store terminating NUL! */
136 /* HEADROOM bytes are available after dst after this call */
137 static void fmt_str(/*char *dst,*/ const char *src
)
139 unsigned len
= strlen(src
);
141 memcpy(dst
, src
, len
);
145 /* HEADROOM bytes after dst are available after this call */
146 static void fmt_url(/*char *dst,*/ const char *name
)
149 unsigned c
= *name
++;
152 if ((c
- '0') > 9 /* not a digit */
153 && ((c
|0x20) - 'a') > ('z' - 'a') /* not A-Z or a-z */
154 && !strchr("._-+@", c
)
157 *dst
++ = "0123456789ABCDEF"[c
>> 4];
158 *dst
= "0123456789ABCDEF"[c
& 0xf];
164 /* HEADROOM bytes are available after dst after this call */
165 static void fmt_html(/*char *dst,*/ const char *name
)
183 /* HEADROOM bytes are available after dst after this call */
184 static void fmt_ull(/*char *dst,*/ unsigned long long n
)
186 char buf
[sizeof(n
)*3 + 2];
189 p
= buf
+ sizeof(buf
) - 1;
192 *--p
= (n
% 10) + '0';
198 /* Does not call guarantee - eats into headroom instead */
199 static void fmt_02u(/*char *dst,*/ unsigned n
)
201 /* n %= 100; - not needed, callers don't pass big n */
202 dst
[0] = (n
/ 10) + '0';
203 dst
[1] = (n
% 10) + '0';
207 /* Does not call guarantee - eats into headroom instead */
208 static void fmt_04u(/*char *dst,*/ unsigned n
)
210 /* n %= 10000; - not needed, callers don't pass big n */
215 int main(int argc
, char *argv
[])
217 dir_list_t
*dir_list
;
219 unsigned dir_list_count
;
221 unsigned count_files
;
222 unsigned long long size_total
;
227 location
= getenv("REQUEST_URI");
231 /* drop URL arguments if any */
232 strchrnul(location
, '?')[0] = '\0';
234 if (location
[0] != '/'
235 || strstr(location
, "//")
236 || strstr(location
, "/../")
237 || strcmp(strrchr(location
, '/'), "/..") == 0
243 || (location
[1] && chdir(location
+ 1))
260 if (dp
->d_name
[0] == '.' && !dp
->d_name
[1])
262 if (stat(dp
->d_name
, &sb
) != 0)
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
;
273 qsort(dir_list
, dir_list_count
, sizeof(dir_list
[0]), (void*)compare_dl
);
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 */
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");
299 while (dir_list_count
--) {
302 if (S_ISDIR(cdir
->dl_mode
)) {
304 } else if (S_ISREG(cdir
->dl_mode
)) {
306 size_total
+= cdir
->dl_size
;
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
))
317 fmt_html(cdir
->dl_name
); /* < etc */
318 if (S_ISDIR(cdir
->dl_mode
))
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
);
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>");
345 fmt_str("<th class=dt>\n");
346 /* "</table></body></html>" - why bother? */
347 guarantee(BUFFER_SIZE
* 2); /* flush */