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hush/networking/httpd_indexcgi.c
Denis Vlasenko de4c5d3d8c httpd: code shrink of dir indexer example
2007-08-23 10:43:18 +00:00

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/*
* Copyright (c) 2007 Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
/*
* This program is a CGI application. It outputs directory index page.
* Put it into cgi-bin/index.cgi and chmod 0755.
*/
/* Build a-la
i486-linux-uclibc-gcc \
-static -static-libgcc \
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
-Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \
-Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \
-Wmissing-prototypes -Wmissing-declarations \
-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \
-ffunction-sections -fdata-sections -fno-guess-branch-probability \
-funsigned-char \
-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \
-march=i386 -mpreferred-stack-boundary=2 \
-Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
httpd_indexcgi.c -o index.cgi
*/
/* We don't use printf, as it pulls in >12 kb of code from uclibc (i386). */
/* Currently malloc machinery is the biggest part of libc we pull in. */
/* We have only one realloc and one strdup, any idea how to do without? */
/* Size (i386, approximate):
* text data bss dec hex filename
* 13036 44 3052 16132 3f04 index.cgi
* 2576 4 2048 4628 1214 index.cgi.o
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <time.h>
/* Appearance of the table is controlled by style sheet *ONLY*,
* formatting code uses <TAG class=CLASS> to apply style
* to elements. Edit stylesheet to your liking and recompile. */
#define STYLE_STR \
"<style>" "\n"\
"table {" "\n"\
"width:100%;" "\n"\
"background-color:#fff5ee;" "\n"\
"border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
"border-spacing:2px;" "\n"\
"border-style:solid;" /* solid solid solid solid; */ "\n"\
"border-color:black;" /* black black black black; */ "\n"\
"border-collapse:collapse;" "\n"\
"}" "\n"\
"th {" "\n"\
"border-width:1px;" /* 1px 1px 1px 1px; */ "\n"\
"padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
"border-style:solid;" /* solid solid solid solid; */ "\n"\
"border-color:black;" /* black black black black; */ "\n"\
"}" "\n"\
"td {" "\n"\
/* top right bottom left */ \
"border-width:0px 1px 0px 1px;" "\n"\
"padding:1px;" /* 1px 1px 1px 1px; */ "\n"\
"border-style:solid;" /* solid solid solid solid; */ "\n"\
"border-color:black;" /* black black black black; */ "\n"\
"white-space:nowrap;" "\n"\
"}" "\n"\
"tr.hdr { background-color:#eee5de; }" "\n"\
"tr.o { background-color:#ffffff; }" "\n"\
/* tr.e { ... } - for even rows (currently none) */ \
"tr.foot { background-color:#eee5de; }" "\n"\
"th.cnt { text-align:left; }" "\n"\
"th.sz { text-align:right; }" "\n"\
"th.dt { text-align:right; }" "\n"\
"td.sz { text-align:right; }" "\n"\
"td.dt { text-align:right; }" "\n"\
"col.nm { width:98%; }" "\n"\
"col.sz { width:1%; }" "\n"\
"col.dt { width:1%; }" "\n"\
"</style>" "\n"\
typedef struct dir_list_t {
char *dl_name;
mode_t dl_mode;
off_t dl_size;
time_t dl_mtime;
} dir_list_t;
static int compare_dl(dir_list_t *a, dir_list_t *b)
{
/* ".." is 'less than' any other dir entry */
if (strcmp(a->dl_name, "..") == 0) {
return -1;
}
if (strcmp(b->dl_name, "..") == 0) {
return 1;
}
if (S_ISDIR(a->dl_mode) != S_ISDIR(b->dl_mode)) {
/* 1 if b is a dir (and thus a is 'after' b, a > b),
* else -1 (a < b) */
return (S_ISDIR(b->dl_mode) != 0) ? 1 : -1;
}
return strcmp(a->dl_name, b->dl_name);
}
static char buffer[2*1024 > sizeof(STYLE_STR) ? 2*1024 : sizeof(STYLE_STR)];
static char *dst = buffer;
enum {
BUFFER_SIZE = sizeof(buffer),
HEADROOM = 64,
};
/* After this call, you have at least size + HEADROOM bytes available
* ahead of dst */
static void guarantee(int size)
{
if (buffer + (BUFFER_SIZE-HEADROOM) - dst >= size)
return;
write(1, buffer, dst - buffer);
dst = buffer;
}
/* NB: formatters do not store terminating NUL! */
/* HEADROOM bytes are available after dst after this call */
static void fmt_str(/*char *dst,*/ const char *src)
{
unsigned len = strlen(src);
guarantee(len);
memcpy(dst, src, len);
dst += len;
}
/* HEADROOM bytes after dst are available after this call */
static void fmt_url(/*char *dst,*/ const char *name)
{
while (*name) {
unsigned c = *name++;
guarantee(3);
*dst = c;
if ((c - '0') > 9 /* not a digit */
&& ((c|0x20) - 'a') > 26 /* not A-Z or a-z */
&& !strchr("._-+@", c)
) {
*dst++ = '%';
*dst++ = "0123456789ABCDEF"[c >> 4];
*dst = "0123456789ABCDEF"[c & 0xf];
}
dst++;
}
}
/* HEADROOM bytes are available after dst after this call */
static void fmt_html(/*char *dst,*/ const char *name)
{
while (*name) {
char c = *name++;
if (c == '<')
fmt_str("&lt;");
else if (c == '>')
fmt_str("&gt;");
else if (c == '&') {
fmt_str("&amp;");
} else {
guarantee(1);
*dst++ = c;
continue;
}
}
}
/* HEADROOM bytes are available after dst after this call */
static void fmt_ull(/*char *dst,*/ unsigned long long n)
{
char buf[sizeof(n)*3 + 2];
char *p;
p = buf + sizeof(buf) - 1;
*p = '\0';
do {
*--p = (n % 10) + '0';
n /= 10;
} while (n);
fmt_str(/*dst,*/ p);
}
/* Does not call guarantee - eats into headroom instead */
static void fmt_02u(/*char *dst,*/ unsigned n)
{
/* n %= 100; - not needed, callers don't pass big n */
dst[0] = (n / 10) + '0';
dst[1] = (n % 10) + '0';
dst += 2;
}
/* Does not call guarantee - eats into headroom instead */
static void fmt_04u(/*char *dst,*/ unsigned n)
{
/* n %= 10000; - not needed, callers don't pass big n */
fmt_02u(n / 100);
fmt_02u(n % 100);
}
int main(void)
{
dir_list_t *dir_list;
dir_list_t *cdir;
unsigned dir_list_count;
unsigned count_dirs;
unsigned count_files;
unsigned long long size_total;
int odd;
DIR *dirp;
char *QUERY_STRING;
QUERY_STRING = getenv("QUERY_STRING");
if (!QUERY_STRING
|| QUERY_STRING[0] != '/'
|| strstr(QUERY_STRING, "/../")
|| strcmp(strrchr(QUERY_STRING, '/'), "/..") == 0
) {
return 1;
}
if (chdir("..")
|| (QUERY_STRING[1] && chdir(QUERY_STRING + 1))
) {
return 1;
}
dirp = opendir(".");
if (!dirp)
return 1;
dir_list = NULL;
dir_list_count = 0;
while (1) {
struct dirent *dp;
struct stat sb;
dp = readdir(dirp);
if (!dp)
break;
if (dp->d_name[0] == '.' && !dp->d_name[1])
continue;
if (stat(dp->d_name, &sb) != 0)
continue;
dir_list = realloc(dir_list, (dir_list_count + 1) * sizeof(dir_list[0]));
dir_list[dir_list_count].dl_name = strdup(dp->d_name);
dir_list[dir_list_count].dl_mode = sb.st_mode;
dir_list[dir_list_count].dl_size = sb.st_size;
dir_list[dir_list_count].dl_mtime = sb.st_mtime;
dir_list_count++;
}
closedir(dirp);
qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl);
fmt_str(
"" /* Additional headers (currently none) */
"\r\n" /* Mandatory empty line after headers */
"<html><head><title>Index of ");
/* Guard against directories with &, > etc */
fmt_html(QUERY_STRING);
fmt_str(
"</title>\n"
STYLE_STR
"</head>" "\n"
"<body>" "\n"
"<h1>Index of ");
fmt_html(QUERY_STRING);
fmt_str(
"</h1>" "\n"
"<table>" "\n"
"<col class=nm><col class=sz><col class=dt>" "\n"
"<tr class=hdr><th class=cnt>Name<th class=sz>Size<th class=dt>Last modified" "\n");
odd = 0;
count_dirs = 0;
count_files = 0;
size_total = 0;
cdir = dir_list;
while (dir_list_count--) {
struct tm *tm;
if (S_ISDIR(cdir->dl_mode)) {
count_dirs++;
} else if (S_ISREG(cdir->dl_mode)) {
count_files++;
size_total += cdir->dl_size;
} else
goto next;
fmt_str("<tr class=");
*dst++ = (odd ? 'o' : 'e');
fmt_str("><td class=nm><a href='");
fmt_url(cdir->dl_name); /* %20 etc */
if (S_ISDIR(cdir->dl_mode))
*dst++ = '/';
fmt_str("'>");
fmt_html(cdir->dl_name); /* &lt; etc */
if (S_ISDIR(cdir->dl_mode))
*dst++ = '/';
fmt_str("</a><td class=sz>");
if (S_ISREG(cdir->dl_mode))
fmt_ull(cdir->dl_size);
fmt_str("<td class=dt>");
tm = gmtime(&cdir->dl_mtime);
fmt_04u(1900 + tm->tm_year); *dst++ = '-';
fmt_02u(tm->tm_mon + 1); *dst++ = '-';
fmt_02u(tm->tm_mday); *dst++ = ' ';
fmt_02u(tm->tm_hour); *dst++ = ':';
fmt_02u(tm->tm_min); *dst++ = ':';
fmt_02u(tm->tm_sec);
*dst++ = '\n';
odd = 1 - odd;
next:
cdir++;
}
fmt_str("<tr class=foot><th class=cnt>Files: ");
fmt_ull(count_files);
/* count_dirs - 1: we don't want to count ".." */
fmt_str(", directories: ");
fmt_ull(count_dirs - 1);
fmt_str("<th class=sz>");
fmt_ull(size_total);
fmt_str("<th class=dt>\n");
/* "</table></body></html>" - why bother? */
guarantee(BUFFER_SIZE * 2); /* flush */
return 0;
}
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