[1765] | 1 | /*
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| 2 | * Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
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| 3 | *
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[2725] | 4 | * Licensed under GPLv2, see file LICENSE in this source tree.
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[1765] | 5 | */
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| 6 |
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| 7 | /*
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| 8 | * This program is a CGI application. It outputs directory index page.
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| 9 | * Put it into cgi-bin/index.cgi and chmod 0755.
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| 10 | */
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| 11 |
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| 12 | /* Build a-la
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| 13 | i486-linux-uclibc-gcc \
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| 14 | -static -static-libgcc \
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| 15 | -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
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| 16 | -Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \
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| 17 | -Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \
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| 18 | -Wmissing-prototypes -Wmissing-declarations \
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| 19 | -Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \
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| 20 | -ffunction-sections -fdata-sections -fno-guess-branch-probability \
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| 21 | -funsigned-char \
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| 22 | -falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \
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| 23 | -march=i386 -mpreferred-stack-boundary=2 \
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| 24 | -Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
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| 25 | httpd_indexcgi.c -o index.cgi
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| 26 | */
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| 27 |
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| 28 | /* We don't use printf, as it pulls in >12 kb of code from uclibc (i386). */
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| 29 | /* Currently malloc machinery is the biggest part of libc we pull in. */
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| 30 | /* We have only one realloc and one strdup, any idea how to do without? */
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[2725] | 31 |
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| 32 | /* Size (i386, static uclibc, approximate):
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[1765] | 33 | * text data bss dec hex filename
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| 34 | * 13036 44 3052 16132 3f04 index.cgi
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| 35 | * 2576 4 2048 4628 1214 index.cgi.o
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| 36 | */
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| 37 |
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[3232] | 38 | #define _GNU_SOURCE 1 /* for strchrnul */
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[1765] | 39 | #include <sys/types.h>
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| 40 | #include <sys/stat.h>
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| 41 | #include <errno.h>
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| 42 | #include <stdint.h>
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| 43 | #include <stdlib.h>
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| 44 | #include <string.h>
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| 45 | #include <unistd.h>
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| 46 | #include <stdio.h>
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| 47 | #include <dirent.h>
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| 48 | #include <time.h>
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| 49 |
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| 50 | /* Appearance of the table is controlled by style sheet *ONLY*,
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| 51 | * formatting code uses <TAG class=CLASS> to apply style
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| 52 | * to elements. Edit stylesheet to your liking and recompile. */
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| 53 |
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| 54 | #define STYLE_STR \
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| 55 | "<style>" "\n"\
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| 56 | "table {" "\n"\
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| 57 | "width:100%;" "\n"\
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| 58 | "background-color:#fff5ee;" "\n"\
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| 59 | "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
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| 60 | "border-spacing:2px;" "\n"\
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| 61 | "border-style:solid;" /* solid solid solid solid; */ "\n"\
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| 62 | "border-color:black;" /* black black black black; */ "\n"\
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| 63 | "border-collapse:collapse;" "\n"\
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| 64 | "}" "\n"\
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| 65 | "th {" "\n"\
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| 66 | "border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
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| 67 | "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
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| 68 | "border-style:solid;" /* solid solid solid solid; */ "\n"\
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| 69 | "border-color:black;" /* black black black black; */ "\n"\
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| 70 | "}" "\n"\
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| 71 | "td {" "\n"\
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| 72 | /* top right bottom left */ \
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| 73 | "border-width:0px 1px 0px 1px;" "\n"\
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| 74 | "padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
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| 75 | "border-style:solid;" /* solid solid solid solid; */ "\n"\
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| 76 | "border-color:black;" /* black black black black; */ "\n"\
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| 77 | "white-space:nowrap;" "\n"\
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| 78 | "}" "\n"\
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| 79 | "tr.hdr { background-color:#eee5de; }" "\n"\
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| 80 | "tr.o { background-color:#ffffff; }" "\n"\
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| 81 | /* tr.e { ... } - for even rows (currently none) */ \
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| 82 | "tr.foot { background-color:#eee5de; }" "\n"\
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| 83 | "th.cnt { text-align:left; }" "\n"\
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| 84 | "th.sz { text-align:right; }" "\n"\
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| 85 | "th.dt { text-align:right; }" "\n"\
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| 86 | "td.sz { text-align:right; }" "\n"\
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| 87 | "td.dt { text-align:right; }" "\n"\
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| 88 | "col.nm { width:98%; }" "\n"\
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| 89 | "col.sz { width:1%; }" "\n"\
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| 90 | "col.dt { width:1%; }" "\n"\
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| 91 | "</style>" "\n"\
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| 92 |
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| 93 | typedef struct dir_list_t {
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| 94 | char *dl_name;
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| 95 | mode_t dl_mode;
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| 96 | off_t dl_size;
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| 97 | time_t dl_mtime;
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| 98 | } dir_list_t;
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| 99 |
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| 100 | static int compare_dl(dir_list_t *a, dir_list_t *b)
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| 101 | {
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| 102 | /* ".." is 'less than' any other dir entry */
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| 103 | if (strcmp(a->dl_name, "..") == 0) {
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| 104 | return -1;
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| 105 | }
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| 106 | if (strcmp(b->dl_name, "..") == 0) {
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| 107 | return 1;
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| 108 | }
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| 109 | if (S_ISDIR(a->dl_mode) != S_ISDIR(b->dl_mode)) {
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| 110 | /* 1 if b is a dir (and thus a is 'after' b, a > b),
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| 111 | * else -1 (a < b) */
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| 112 | return (S_ISDIR(b->dl_mode) != 0) ? 1 : -1;
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| 113 | }
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| 114 | return strcmp(a->dl_name, b->dl_name);
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| 115 | }
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| 116 |
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| 117 | static char buffer[2*1024 > sizeof(STYLE_STR) ? 2*1024 : sizeof(STYLE_STR)];
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| 118 | static char *dst = buffer;
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| 119 | enum {
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| 120 | BUFFER_SIZE = sizeof(buffer),
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| 121 | HEADROOM = 64,
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| 122 | };
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| 123 |
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| 124 | /* After this call, you have at least size + HEADROOM bytes available
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| 125 | * ahead of dst */
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| 126 | static void guarantee(int size)
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| 127 | {
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| 128 | if (buffer + (BUFFER_SIZE-HEADROOM) - dst >= size)
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| 129 | return;
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[2725] | 130 | write(STDOUT_FILENO, buffer, dst - buffer);
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[1765] | 131 | dst = buffer;
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| 132 | }
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| 133 |
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| 134 | /* NB: formatters do not store terminating NUL! */
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| 135 |
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| 136 | /* HEADROOM bytes are available after dst after this call */
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| 137 | static void fmt_str(/*char *dst,*/ const char *src)
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| 138 | {
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| 139 | unsigned len = strlen(src);
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| 140 | guarantee(len);
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| 141 | memcpy(dst, src, len);
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| 142 | dst += len;
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| 143 | }
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| 144 |
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| 145 | /* HEADROOM bytes after dst are available after this call */
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| 146 | static void fmt_url(/*char *dst,*/ const char *name)
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| 147 | {
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| 148 | while (*name) {
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| 149 | unsigned c = *name++;
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| 150 | guarantee(3);
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| 151 | *dst = c;
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| 152 | if ((c - '0') > 9 /* not a digit */
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[2725] | 153 | && ((c|0x20) - 'a') > ('z' - 'a') /* not A-Z or a-z */
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[1765] | 154 | && !strchr("._-+@", c)
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| 155 | ) {
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| 156 | *dst++ = '%';
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| 157 | *dst++ = "0123456789ABCDEF"[c >> 4];
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| 158 | *dst = "0123456789ABCDEF"[c & 0xf];
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| 159 | }
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| 160 | dst++;
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| 161 | }
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| 162 | }
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| 163 |
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| 164 | /* HEADROOM bytes are available after dst after this call */
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| 165 | static void fmt_html(/*char *dst,*/ const char *name)
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| 166 | {
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| 167 | while (*name) {
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| 168 | char c = *name++;
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| 169 | if (c == '<')
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| 170 | fmt_str("<");
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| 171 | else if (c == '>')
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| 172 | fmt_str(">");
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| 173 | else if (c == '&') {
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| 174 | fmt_str("&");
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| 175 | } else {
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| 176 | guarantee(1);
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| 177 | *dst++ = c;
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| 178 | continue;
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| 179 | }
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| 180 | }
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| 181 | }
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| 182 |
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| 183 | /* HEADROOM bytes are available after dst after this call */
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| 184 | static void fmt_ull(/*char *dst,*/ unsigned long long n)
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| 185 | {
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| 186 | char buf[sizeof(n)*3 + 2];
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| 187 | char *p;
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| 188 |
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| 189 | p = buf + sizeof(buf) - 1;
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| 190 | *p = '\0';
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| 191 | do {
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| 192 | *--p = (n % 10) + '0';
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| 193 | n /= 10;
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| 194 | } while (n);
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| 195 | fmt_str(/*dst,*/ p);
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| 196 | }
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| 197 |
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| 198 | /* Does not call guarantee - eats into headroom instead */
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| 199 | static void fmt_02u(/*char *dst,*/ unsigned n)
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| 200 | {
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| 201 | /* n %= 100; - not needed, callers don't pass big n */
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| 202 | dst[0] = (n / 10) + '0';
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| 203 | dst[1] = (n % 10) + '0';
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| 204 | dst += 2;
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| 205 | }
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| 206 |
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| 207 | /* Does not call guarantee - eats into headroom instead */
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| 208 | static void fmt_04u(/*char *dst,*/ unsigned n)
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| 209 | {
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| 210 | /* n %= 10000; - not needed, callers don't pass big n */
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| 211 | fmt_02u(n / 100);
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| 212 | fmt_02u(n % 100);
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| 213 | }
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| 214 |
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[2725] | 215 | int main(int argc, char *argv[])
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[1765] | 216 | {
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| 217 | dir_list_t *dir_list;
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| 218 | dir_list_t *cdir;
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| 219 | unsigned dir_list_count;
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| 220 | unsigned count_dirs;
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| 221 | unsigned count_files;
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| 222 | unsigned long long size_total;
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| 223 | int odd;
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| 224 | DIR *dirp;
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[3232] | 225 | char *location;
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[1765] | 226 |
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[3232] | 227 | location = getenv("REQUEST_URI");
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| 228 | if (!location)
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| 229 | return 1;
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| 230 |
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| 231 | /* drop URL arguments if any */
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| 232 | strchrnul(location, '?')[0] = '\0';
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| 233 |
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| 234 | if (location[0] != '/'
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| 235 | || strstr(location, "//")
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| 236 | || strstr(location, "/../")
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| 237 | || strcmp(strrchr(location, '/'), "/..") == 0
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[1765] | 238 | ) {
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| 239 | return 1;
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| 240 | }
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| 241 |
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| 242 | if (chdir("..")
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[3232] | 243 | || (location[1] && chdir(location + 1))
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[1765] | 244 | ) {
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| 245 | return 1;
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| 246 | }
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| 247 |
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| 248 | dirp = opendir(".");
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| 249 | if (!dirp)
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| 250 | return 1;
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| 251 | dir_list = NULL;
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| 252 | dir_list_count = 0;
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| 253 | while (1) {
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| 254 | struct dirent *dp;
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| 255 | struct stat sb;
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| 256 |
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| 257 | dp = readdir(dirp);
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| 258 | if (!dp)
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| 259 | break;
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| 260 | if (dp->d_name[0] == '.' && !dp->d_name[1])
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| 261 | continue;
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| 262 | if (stat(dp->d_name, &sb) != 0)
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| 263 | continue;
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| 264 | dir_list = realloc(dir_list, (dir_list_count + 1) * sizeof(dir_list[0]));
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| 265 | dir_list[dir_list_count].dl_name = strdup(dp->d_name);
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| 266 | dir_list[dir_list_count].dl_mode = sb.st_mode;
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| 267 | dir_list[dir_list_count].dl_size = sb.st_size;
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| 268 | dir_list[dir_list_count].dl_mtime = sb.st_mtime;
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| 269 | dir_list_count++;
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| 270 | }
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| 271 | closedir(dirp);
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| 272 |
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| 273 | qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl);
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| 274 |
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| 275 | fmt_str(
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| 276 | "" /* Additional headers (currently none) */
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| 277 | "\r\n" /* Mandatory empty line after headers */
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| 278 | "<html><head><title>Index of ");
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| 279 | /* Guard against directories with &, > etc */
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[3232] | 280 | fmt_html(location);
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[1765] | 281 | fmt_str(
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| 282 | "</title>\n"
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| 283 | STYLE_STR
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| 284 | "</head>" "\n"
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| 285 | "<body>" "\n"
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| 286 | "<h1>Index of ");
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[3232] | 287 | fmt_html(location);
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[1765] | 288 | fmt_str(
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| 289 | "</h1>" "\n"
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| 290 | "<table>" "\n"
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| 291 | "<col class=nm><col class=sz><col class=dt>" "\n"
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| 292 | "<tr class=hdr><th class=cnt>Name<th class=sz>Size<th class=dt>Last modified" "\n");
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| 293 |
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| 294 | odd = 0;
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| 295 | count_dirs = 0;
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| 296 | count_files = 0;
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| 297 | size_total = 0;
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| 298 | cdir = dir_list;
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| 299 | while (dir_list_count--) {
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[2725] | 300 | struct tm *ptm;
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[1765] | 301 |
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| 302 | if (S_ISDIR(cdir->dl_mode)) {
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| 303 | count_dirs++;
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| 304 | } else if (S_ISREG(cdir->dl_mode)) {
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| 305 | count_files++;
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| 306 | size_total += cdir->dl_size;
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| 307 | } else
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| 308 | goto next;
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| 309 |
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| 310 | fmt_str("<tr class=");
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| 311 | *dst++ = (odd ? 'o' : 'e');
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| 312 | fmt_str("><td class=nm><a href='");
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| 313 | fmt_url(cdir->dl_name); /* %20 etc */
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| 314 | if (S_ISDIR(cdir->dl_mode))
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| 315 | *dst++ = '/';
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| 316 | fmt_str("'>");
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| 317 | fmt_html(cdir->dl_name); /* < etc */
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| 318 | if (S_ISDIR(cdir->dl_mode))
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| 319 | *dst++ = '/';
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| 320 | fmt_str("</a><td class=sz>");
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| 321 | if (S_ISREG(cdir->dl_mode))
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| 322 | fmt_ull(cdir->dl_size);
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| 323 | fmt_str("<td class=dt>");
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[2725] | 324 | ptm = gmtime(&cdir->dl_mtime);
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| 325 | fmt_04u(1900 + ptm->tm_year); *dst++ = '-';
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| 326 | fmt_02u(ptm->tm_mon + 1); *dst++ = '-';
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| 327 | fmt_02u(ptm->tm_mday); *dst++ = ' ';
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| 328 | fmt_02u(ptm->tm_hour); *dst++ = ':';
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| 329 | fmt_02u(ptm->tm_min); *dst++ = ':';
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| 330 | fmt_02u(ptm->tm_sec);
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[1765] | 331 | *dst++ = '\n';
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| 332 |
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| 333 | odd = 1 - odd;
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| 334 | next:
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| 335 | cdir++;
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| 336 | }
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| 337 |
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| 338 | fmt_str("<tr class=foot><th class=cnt>Files: ");
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| 339 | fmt_ull(count_files);
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| 340 | /* count_dirs - 1: we don't want to count ".." */
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| 341 | fmt_str(", directories: ");
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| 342 | fmt_ull(count_dirs - 1);
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| 343 | fmt_str("<th class=sz>");
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| 344 | fmt_ull(size_total);
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| 345 | fmt_str("<th class=dt>\n");
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| 346 | /* "</table></body></html>" - why bother? */
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| 347 | guarantee(BUFFER_SIZE * 2); /* flush */
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| 348 |
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| 349 | return 0;
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| 350 | }
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