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authorDenis Vlasenko <vda.linux@googlemail.com>2007-08-22 10:38:44 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-08-22 10:38:44 +0000
commit764299819016e5fb400be2fccf12d8de248e4cef (patch)
treea031b6c86205944508794b9ef2dc0dca1e629f3d
parent72b6a65b2fab7325767ce72fc71b9cf45514764a (diff)
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httpd: replace shell-based dir indexer cgi example with C-based one.
Diffstat
-rw-r--r--networking/httpd_index_cgi_example50
-rw-r--r--networking/httpd_indexcgi.c331
2 files changed, 331 insertions, 50 deletions
diff --git a/networking/httpd_index_cgi_example b/networking/httpd_index_cgi_example
deleted file mode 100644
index 9c8e022a6..000000000
--- a/networking/httpd_index_cgi_example
+++ /dev/null
@@ -1,50 +0,0 @@
1#!/bin/sh
2# This CGI creates directory index.
3# Put it into cgi-bin/index.cgi and chmod 0755.
4#
5# Problems:
6# * Unsafe wrt weird filenames with <>"'& etc...
7# * Not efficient: calls stat (program, not syscall) for each file
8# * Probably requires bash
9#
10# If you want speed and safety, you need to code it in C
11
12# Must start with '/'
13test "${QUERY_STRING:0:1}" = "/" || exit 1
14# /../ is not allowed
15test "${QUERY_STRING%/../*}" = "$QUERY_STRING" || exit 1
16test "${QUERY_STRING%/..}" = "$QUERY_STRING" || exit 1
17
18# Outta cgi-bin...
19cd .. 2>/dev/null || exit 1
20# Strip leading '/', go to target dir
21cd "${QUERY_STRING:1}" 2>/dev/null || exit 1
22
23f=`dirname "$QUERY_STRING"`
24test "$f" = "/" && f=""
25
26printf "%s" \
27$'HTTP/1.0 200 OK\r\n'\
28$'Content-type: text/html\r\n\r\n'\
29"<html><head><title>Index of $QUERY_STRING</title></head>"$'\r\n'\
30"<body><h1>Index of $QUERY_STRING</h1><pre>"$'\r\n'\
31$'<table width=100%>\r\n'\
32$'<col><col><col width=0*>\r\n'\
33$'<tr><th>Name<th align=right>Last modified<th align=right>Size\r\n'\
34\
35"<tr><td><a href='$f/'>..</a><td><td>"$'\r\n'
36
37IFS='#'
38for f in *; do
39 # Guard against empty dirs...
40 test -e "$f" && \
41 stat -c "%F#%s#%z" "$f" | {
42 read type size cdt junk
43 dir=''
44 test "$type" = "directory" && dir='/'
45 cdt="${cdt//.*}" # no fractional seconds
46 cdt="${cdt// /&nbsp;}" # prevent wrapping around space
47 printf "%s" "<tr><td><a href='$f$dir'>$f</a><td align=right>$cdt<td align=right>$size"$'\r\n'
48 }
49done
50printf "</table></pre><hr></body></html>"$'\r\n'
diff --git a/networking/httpd_indexcgi.c b/networking/httpd_indexcgi.c
new file mode 100644
index 000000000..b7e466c4c
--- /dev/null
+++ b/networking/httpd_indexcgi.c
@@ -0,0 +1,331 @@
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 creates 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
27Size (approximate):
28 text data bss dec hex filename
2922642 160 3052 25854 64fe index.cgi
30*/
31
32/* TODO: get rid of printf's: printf code is more than 50%
33 * of the entire executable when built against static uclibc */
34
35#include <sys/types.h>
36#include <sys/stat.h>
37#include <errno.h>
38#include <stdint.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42#include <stdio.h>
43#include <dirent.h>
44#include <time.h>
45
46/* Appearance of the table is controlled by style sheet *ONLY*,
47 * formatting code uses <TAG class=CLASS> to apply style
48 * to elements. Edit stylesheet to your liking and recompile. */
49
50static const char str_header[] =
51"" /* Additional headers (currently none) */
52"\r\n" /* Mandatory empty line after headers */
53"<html><head><title>Index of %s</title>" "\n"
54"<style>" "\n"
55"table {" "\n"
56" width: 100%%;" "\n"
57" background-color: #fff5ee;" "\n"
58" border-width: 1px;" /* 1px 1px 1px 1px; */ "\n"
59" border-spacing: 2px;" "\n"
60" border-style: solid;" /* solid solid solid solid; */ "\n"
61" border-color: black;" /* black black black black; */ "\n"
62" border-collapse: collapse;" "\n"
63"}" "\n"
64"th {" "\n"
65" border-width: 1px;" /* 1px 1px 1px 1px; */ "\n"
66" padding: 1px;" /* 1px 1px 1px 1px; */ "\n"
67" border-style: solid;" /* solid solid solid solid; */ "\n"
68" border-color: black;" /* black black black black; */ "\n"
69"}" "\n"
70"td {" "\n"
71 /* top right bottom left */
72" border-width: 0px 1px 0px 1px;" "\n"
73" padding: 1px;" /* 1px 1px 1px 1px; */ "\n"
74" border-style: solid;" /* solid solid solid solid; */ "\n"
75" border-color: black;" /* black black black black; */ "\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"</head>" "\n"
91"<body>" "\n"
92"<h1>Index of %s</h1>" "\n"
93"" "\n"
94"<table>" "\n"
95"<col class=nm><col class=sz><col class=dt>" "\n"
96"<tr class=hdr><th class=cnt>Name<th class=sz>Size<th class=dt>Last modified" "\n"
97;
98
99static const char str_footer[] =
100"<tr class=foot><th class=cnt>Files: %u, directories: %u<th class=sz>%llu<th class=dt>&nbsp;" "\n"
101/* "</table></body></html>" - why bother? */
102;
103
104static int bad_url_char(unsigned c)
105{
106 return (c - '0') > 9 /* not a digit */
107 && ((c|0x20) - 'a') > 26 /* not A-Z or a-z */
108 && !strchr("._-+@", c);
109}
110
111static char *url_encode(const char *name)
112{
113 int i;
114 int size = 0;
115 int len = strlen(name);
116 char *p, *result;
117
118 i = 0;
119 while (name[i]) {
120 if (bad_url_char((unsigned)name[i]))
121 size++;
122 i++;
123 }
124
125 /* No %xx needed! */
126 if (!size)
127 return (char*)name;
128
129 /* Each %xx requires 2 additional chars */
130 size = size * 2 + len + 1;
131 p = result = malloc(size);
132
133 i = 0;
134 while (name[i]) {
135 *p = name[i];
136 if (bad_url_char((unsigned)name[i])) {
137 *p++ = '%';
138 *p++ = "0123456789ABCDEF"[(uint8_t)(name[i]) >> 4];
139 *p = "0123456789ABCDEF"[(uint8_t)(name[i]) & 0xf];
140 }
141 p++;
142 i++;
143 }
144 *p = 0;
145 return result;
146}
147
148static char *html_encode(const char *name)
149{
150 int i;
151 int size = 0;
152 int len = strlen(name);
153 char *p, *result;
154
155 i = 0;
156 while (name[i]) {
157 if (name[i] == '<'
158 || name[i] == '>'
159 || name[i] == '&'
160 ) {
161 size++;
162 }
163 i++;
164 }
165
166 /* No &lt; etc needed! */
167 if (!size)
168 return (char*)name;
169
170 /* &amp; requires 4 additional chars */
171 size = size * 4 + len + 1;
172 p = result = malloc(size);
173
174 i = 0;
175 while (name[i]) {
176 char c;
177 *p = c = name[i++];
178 if (c == '<')
179 strcpy(p, "&lt;");
180 else if (c == '>')
181 strcpy(p, "&gt;");
182 else if (c == '&')
183 strcpy(++p, "amp;");
184 else {
185 p++;
186 continue;
187 }
188 p += 4;
189 }
190 *p = 0;
191 return result;
192}
193
194typedef struct dir_list_t {
195 char *dl_name;
196 mode_t dl_mode;
197 off_t dl_size;
198 time_t dl_mtime;
199} dir_list_t;
200
201static int compare_dl(dir_list_t *a, dir_list_t *b)
202{
203 if (strcmp(a->dl_name, "..") == 0) {
204 /* ".." is 'less than' any other dir entry */
205 return -1;
206 }
207 if (strcmp(b->dl_name, "..") == 0) {
208 return 1;
209 }
210 if (S_ISDIR(a->dl_mode) != S_ISDIR(b->dl_mode)) {
211 /* 1 if b is a dir (and thus a is 'after' b, a > b),
212 * else -1 (a < b)*/
213 return (S_ISDIR(b->dl_mode) != 0) ? 1 : -1;
214 }
215 return strcmp(a->dl_name, b->dl_name);
216}
217
218int main(void)
219{
220 dir_list_t *dir_list;
221 dir_list_t *cdir;
222 unsigned dir_list_count;
223 unsigned count_dirs;
224 unsigned count_files;
225 unsigned long long size_total;
226 int odd;
227 DIR *dirp;
228 char *QUERY_STRING;
229
230 QUERY_STRING = getenv("QUERY_STRING");
231 if (!QUERY_STRING
232 || QUERY_STRING[0] != '/'
233 || strstr(QUERY_STRING, "/../")
234 || strcmp(strrchr(QUERY_STRING, '/'), "/..") == 0
235 ) {
236 return 1;
237 }
238
239 if (chdir("..")
240 || (QUERY_STRING[1] && chdir(QUERY_STRING + 1))
241 ) {
242 return 1;
243 }
244
245 dirp = opendir(".");
246 if (!dirp)
247 return 1;
248
249 dir_list = NULL;
250 dir_list_count = 0;
251 while (1) {
252 struct dirent *dp;
253 struct stat sb;
254
255 dp = readdir(dirp);
256 if (!dp)
257 break;
258 if (dp->d_name[0] == '.' && !dp->d_name[1])
259 continue;
260 if (stat(dp->d_name, &sb) != 0)
261 continue;
262 dir_list = realloc(dir_list, (dir_list_count + 1) * sizeof(dir_list[0]));
263 dir_list[dir_list_count].dl_name = strdup(dp->d_name);
264 dir_list[dir_list_count].dl_mode = sb.st_mode;
265 dir_list[dir_list_count].dl_size = sb.st_size;
266 dir_list[dir_list_count].dl_mtime = sb.st_mtime;
267 dir_list_count++;
268 }
269
270 qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl);
271
272 /* Guard against directories wit &, > etc */
273 QUERY_STRING = html_encode(QUERY_STRING);
274 printf(str_header, QUERY_STRING, QUERY_STRING);
275
276 odd = 0;
277 count_dirs = 0;
278 count_files = 0;
279 size_total = 0;
280
281 cdir = dir_list;
282 while (dir_list_count--) {
283 char size_str[sizeof(long long) * 3];
284 const char *slash_if_dir;
285 struct tm *tm;
286 char *href;
287 char *filename;
288 char datetime_str[sizeof("2000-02-02&nbsp;02:02:02")];
289
290 slash_if_dir = "/";
291 if (S_ISDIR(cdir->dl_mode)) {
292 count_dirs++;
293 size_str[0] = '\0';
294 } else if (S_ISREG(cdir->dl_mode)) {
295 count_files++;
296 size_total += cdir->dl_size;
297 slash_if_dir++; /* points to "" now */
298 sprintf(size_str, "%llu", (unsigned long long)(cdir->dl_size));
299 } else
300 goto next;
301 href = url_encode(cdir->dl_name); /* %20 etc */
302 filename = html_encode(cdir->dl_name); /* &lt; etc */
303 tm = gmtime(&cdir->dl_mtime);
304 sprintf(datetime_str, "%04u-%02u-%02u&nbsp;%02u:%02u:%02u",
305 (unsigned)(1900 + tm->tm_year),
306 (unsigned)(tm->tm_mon + 1),
307 (unsigned)(tm->tm_mday),
308 (unsigned)(tm->tm_hour),
309 (unsigned)(tm->tm_min),
310 (unsigned)(tm->tm_sec)
311 );
312 printf("<tr class=%c><td class=nm><a href='%s%s'>%s%s</a><td class=sz>%s<td class=dt>%s\n",
313 odd ? 'o' : 'e',
314 href, slash_if_dir,
315 filename, slash_if_dir,
316 size_str,
317 datetime_str
318 );
319 if (cdir->dl_name != href)
320 free(href);
321 if (cdir->dl_name != filename)
322 free(filename);
323 odd = 1 - odd;
324 next:
325 cdir++;
326 }
327
328 /* count_dirs - 1: we don't want to count ".." */
329 printf(str_footer, count_files, count_dirs - 1, size_total);
330 return 0;
331}
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