httpd: replace shell-based dir indexer cgi example with C-based one.

author: Denis Vlasenko 2007-08-22 10:38:44 +0000
committer: Denis Vlasenko 2007-08-22 10:38:44 +0000
commit: 764299819016e5fb400be2fccf12d8de248e4cef (patch)
tree: a031b6c86205944508794b9ef2dc0dca1e629f3d /networking
parent: 72b6a65b2fab7325767ce72fc71b9cf45514764a (diff)
download: busybox-764299819016e5fb400be2fccf12d8de248e4cef.zip
busybox-764299819016e5fb400be2fccf12d8de248e4cef.tar.gz
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 9c8e022..0000000
--- a/networking/httpd_index_cgi_example
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/bin/sh
-# This CGI creates directory index.
-# Put it into cgi-bin/index.cgi and chmod 0755.
-#
-# Problems:
-# * Unsafe wrt weird filenames with <>"'& etc...
-# * Not efficient: calls stat (program, not syscall) for each file
-# * Probably requires bash
-#
-# If you want speed and safety, you need to code it in C
-
-# Must start with '/'
-test "${QUERY_STRING:0:1}" = "/" || exit 1
-# /../ is not allowed
-test "${QUERY_STRING%/../*}" = "$QUERY_STRING" || exit 1
-test "${QUERY_STRING%/..}" = "$QUERY_STRING" || exit 1
-
-# Outta cgi-bin...
-cd .. 2>/dev/null || exit 1
-# Strip leading '/', go to target dir
-cd "${QUERY_STRING:1}" 2>/dev/null || exit 1
-
-f=`dirname "$QUERY_STRING"`
-test "$f" = "/" && f=""
-
-printf "%s" \
-$'HTTP/1.0 200 OK\r\n'\
-$'Content-type: text/html\r\n\r\n'\
-"<html><head><title>Index of $QUERY_STRING</title></head>"$'\r\n'\
-"<body><h1>Index of $QUERY_STRING</h1><pre>"$'\r\n'\
-$'<table width=100%>\r\n'\
-$'<col><col><col width=0*>\r\n'\
-$'<tr><th>Name<th align=right>Last modified<th align=right>Size\r\n'\
-\
-"<tr><td><a href='$f/'>..</a><td><td>"$'\r\n'
-
-IFS='#'
-for f in *; do
-    # Guard against empty dirs...
-    test -e "$f" && \
-    stat -c "%F#%s#%z" "$f" | {
-	read type size cdt junk
-	dir=''
-	test "$type" = "directory" && dir='/'
-	cdt="${cdt//.*}" # no fractional seconds
-	cdt="${cdt// /&nbsp;}" # prevent wrapping around space
-	printf "%s" "<tr><td><a href='$f$dir'>$f</a><td align=right>$cdt<td align=right>$size"$'\r\n'
-    }
-done
-printf "</table></pre><hr></body></html>"$'\r\n'
diff --git a/networking/httpd_indexcgi.c b/networking/httpd_indexcgi.c
new file mode 100644
index 0000000..b7e466c
--- /dev/null
+++ b/networking/httpd_indexcgi.c
@@ -0,0 +1,331 @@
+/*
+ * 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 creates 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
+
+Size (approximate):
+ text    data     bss     dec     hex filename
+22642     160    3052   25854    64fe index.cgi
+*/
+
+/* TODO: get rid of printf's: printf code is more than 50%
+ * of the entire executable when built against static uclibc */
+
+#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. */
+
+static const char str_header[] =
+"" /* Additional headers (currently none) */
+"\r\n" /* Mandatory empty line after headers */
+"<html><head><title>Index of %s</title>"                "\n"
+"<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"
+"}"                                                     "\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"
+"</head>"                                               "\n"
+"<body>"                                                "\n"
+"<h1>Index of %s</h1>"                                  "\n"
+""                                                      "\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"
+;
+
+static const char str_footer[] =
+"<tr class=foot><th class=cnt>Files: %u, directories: %u<th class=sz>%llu<th class=dt>&nbsp;" "\n"
+/* "</table></body></html>" - why bother? */
+;
+
+static int bad_url_char(unsigned c)
+{
+	return (c - '0') > 9 /* not a digit */
+	    && ((c|0x20) - 'a') > 26 /* not A-Z or a-z */
+	    && !strchr("._-+@", c);
+}
+
+static char *url_encode(const char *name)
+{
+	int i;
+	int size = 0;
+	int len = strlen(name);
+	char *p, *result;
+
+	i = 0;
+	while (name[i]) {
+		if (bad_url_char((unsigned)name[i]))
+			size++;
+		i++;
+	}
+
+	/* No %xx needed! */
+	if (!size)
+		return (char*)name;
+
+	/* Each %xx requires 2 additional chars */
+	size = size * 2 + len + 1;
+	p = result = malloc(size);
+
+	i = 0;
+	while (name[i]) {
+		*p = name[i];
+		if (bad_url_char((unsigned)name[i])) {
+			*p++ = '%';
+			*p++ = "0123456789ABCDEF"[(uint8_t)(name[i]) >> 4];
+			*p = "0123456789ABCDEF"[(uint8_t)(name[i]) & 0xf];
+		}
+		p++;
+		i++;
+	}
+	*p = 0;
+	return result;
+}
+
+static char *html_encode(const char *name)
+{
+	int i;
+	int size = 0;
+	int len = strlen(name);
+	char *p, *result;
+
+	i = 0;
+	while (name[i]) {
+		if (name[i] == '<'
+		 || name[i] == '>'
+		 || name[i] == '&'
+		) {
+			size++;
+		}
+		i++;
+	}
+
+	/* No &lt; etc needed! */
+	if (!size)
+		return (char*)name;
+
+	/* &amp; requires 4 additional chars */
+	size = size * 4 + len + 1;
+	p = result = malloc(size);
+
+	i = 0;
+	while (name[i]) {
+		char c;
+		*p = c = name[i++];
+		if (c == '<')
+			strcpy(p, "&lt;");
+		else if (c == '>')
+			strcpy(p, "&gt;");
+		else if (c == '&')
+			strcpy(++p, "amp;");
+		else {
+			p++;
+			continue;
+		}
+		p += 4;
+	}
+	*p = 0;
+	return result;
+}
+
+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)
+{
+	if (strcmp(a->dl_name, "..") == 0) {
+		/* ".." is 'less than' any other dir entry */
+		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);
+}
+
+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++;
+	}
+
+	qsort(dir_list, dir_list_count, sizeof(dir_list[0]), (void*)compare_dl);
+
+	/* Guard against directories wit &, > etc */
+	QUERY_STRING = html_encode(QUERY_STRING);
+	printf(str_header, QUERY_STRING, QUERY_STRING);
+
+	odd = 0;
+	count_dirs = 0;
+	count_files = 0;
+	size_total = 0;
+
+	cdir = dir_list;
+	while (dir_list_count--) {
+		char size_str[sizeof(long long) * 3];
+		const char *slash_if_dir;
+		struct tm *tm;
+		char *href;
+		char *filename;
+		char datetime_str[sizeof("2000-02-02&nbsp;02:02:02")];
+
+		slash_if_dir = "/";
+		if (S_ISDIR(cdir->dl_mode)) {
+			count_dirs++;
+			size_str[0] = '\0';
+		} else if (S_ISREG(cdir->dl_mode)) {
+			count_files++;
+			size_total += cdir->dl_size;
+			slash_if_dir++; /* points to "" now */
+			sprintf(size_str, "%llu", (unsigned long long)(cdir->dl_size));
+		} else
+			goto next;
+		href = url_encode(cdir->dl_name); /* %20 etc */
+		filename = html_encode(cdir->dl_name); /* &lt; etc */
+		tm = gmtime(&cdir->dl_mtime);
+		sprintf(datetime_str, "%04u-%02u-%02u&nbsp;%02u:%02u:%02u",
+			(unsigned)(1900 + tm->tm_year),
+			(unsigned)(tm->tm_mon + 1),
+			(unsigned)(tm->tm_mday),
+			(unsigned)(tm->tm_hour),
+			(unsigned)(tm->tm_min),
+			(unsigned)(tm->tm_sec)
+		);
+		printf("<tr class=%c><td class=nm><a href='%s%s'>%s%s</a><td class=sz>%s<td class=dt>%s\n",
+			odd ? 'o' : 'e',
+			href, slash_if_dir,
+			filename, slash_if_dir,
+			size_str,
+			datetime_str
+		);
+		if (cdir->dl_name != href)
+			free(href);
+		if (cdir->dl_name != filename)
+			free(filename);
+		odd = 1 - odd;
+ next:
+		cdir++;
+	}
+
+	/* count_dirs - 1: we don't want to count ".." */
+	printf(str_footer, count_files, count_dirs - 1, size_total);
+	return 0;
+}
author	Denis Vlasenko	2007-08-22 10:38:44 +0000
committer	Denis Vlasenko	2007-08-22 10:38:44 +0000
commit	764299819016e5fb400be2fccf12d8de248e4cef (patch)
tree	a031b6c86205944508794b9ef2dc0dca1e629f3d /networking
parent	72b6a65b2fab7325767ce72fc71b9cf45514764a (diff)
download	busybox-764299819016e5fb400be2fccf12d8de248e4cef.zip busybox-764299819016e5fb400be2fccf12d8de248e4cef.tar.gz