+++ /dev/null
---- /dev/null
-+++ b/extensions/libxt_layer7.c
-@@ -0,0 +1,368 @@
-+/*
-+ Shared library add-on to iptables for layer 7 matching support.
-+
-+ By Matthew Strait <quadong@users.sf.net>, Oct 2003-Aug 2008.
-+
-+ http://l7-filter.sf.net
-+
-+ This program is free software; you can redistribute it and/or
-+ modify it under the terms of the GNU General Public License
-+ as published by the Free Software Foundation; either version
-+ 2 of the License, or (at your option) any later version.
-+ http://www.gnu.org/licenses/gpl.txt
-+*/
-+
-+#define _GNU_SOURCE
-+#include <stdio.h>
-+#include <netdb.h>
-+#include <string.h>
-+#include <stdlib.h>
-+#include <getopt.h>
-+#include <ctype.h>
-+#include <dirent.h>
-+
-+#include <xtables.h>
-+#include <linux/netfilter/xt_layer7.h>
-+
-+#define MAX_FN_LEN 256
-+
-+static char l7dir[MAX_FN_LEN] = "\0";
-+
-+/* Function which prints out usage message. */
-+static void help(void)
-+{
-+ printf(
-+ "layer7 match options:\n"
-+ " --l7dir <directory> : Look for patterns here instead of /etc/l7-protocols/\n"
-+ " (--l7dir must be specified before --l7proto if used)\n"
-+ "[!] --l7proto <name>: Match named protocol using /etc/l7-protocols/.../name.pat\n");
-+}
-+
-+static const struct option opts[] = {
-+ { .name = "l7proto", .has_arg = 1, .val = 'p' },
-+ { .name = "l7dir", .has_arg = 1, .val = 'd' },
-+ { .name = NULL }
-+};
-+
-+/* reads filename, puts protocol info into layer7_protocol_info, number of protocols to numprotos */
-+static int parse_protocol_file(char * filename, const char * protoname, struct xt_layer7_info *info)
-+{
-+ FILE * f;
-+ char * line = NULL;
-+ size_t len = 0;
-+
-+ enum { protocol, pattern, done } datatype = protocol;
-+
-+ f = fopen(filename, "r");
-+
-+ if(!f)
-+ return 0;
-+
-+ while(getline(&line, &len, f) != -1)
-+ {
-+ if(strlen(line) < 2 || line[0] == '#')
-+ continue;
-+
-+ /* strip the pesky newline... */
-+ if(line[strlen(line) - 1] == '\n')
-+ line[strlen(line) - 1] = '\0';
-+
-+ if(datatype == protocol)
-+ {
-+ /* Ignore everything on the line beginning with the
-+ first space or tab . For instance, this allows the
-+ protocol line in http.pat to be "http " (or
-+ "http I am so cool") instead of just "http". */
-+ if(strchr(line, ' ')){
-+ char * space = strchr(line, ' ');
-+ space[0] = '\0';
-+ }
-+ if(strchr(line, '\t')){
-+ char * space = strchr(line, '\t');
-+ space[0] = '\0';
-+ }
-+
-+ /* sanity check. First non-comment non-blank
-+ line must be the same as the file name. */
-+ if(strcmp(line, protoname))
-+ xtables_error(OTHER_PROBLEM,
-+ "Protocol name (%s) doesn't match file name (%s). Bailing out\n",
-+ line, filename);
-+
-+ if(strlen(line) >= MAX_PROTOCOL_LEN)
-+ xtables_error(PARAMETER_PROBLEM,
-+ "Protocol name in %s too long!", filename);
-+ strncpy(info->protocol, line, MAX_PROTOCOL_LEN);
-+
-+ datatype = pattern;
-+ }
-+ else if(datatype == pattern)
-+ {
-+ if(strlen(line) >= MAX_PATTERN_LEN)
-+ xtables_error(PARAMETER_PROBLEM, "Pattern in %s too long!", filename);
-+ strncpy(info->pattern, line, MAX_PATTERN_LEN);
-+
-+ datatype = done;
-+ break;
-+ }
-+ else
-+ xtables_error(OTHER_PROBLEM, "Internal error");
-+ }
-+
-+ if(datatype != done)
-+ xtables_error(OTHER_PROBLEM, "Failed to get all needed data from %s", filename);
-+
-+ if(line) free(line);
-+ fclose(f);
-+
-+ return 1;
-+}
-+
-+static int hex2dec(char c)
-+{
-+ switch (c)
-+ {
-+ case '0' ... '9':
-+ return c - '0';
-+ case 'a' ... 'f':
-+ return c - 'a' + 10;
-+ case 'A' ... 'F':
-+ return c - 'A' + 10;
-+ default:
-+ xtables_error(OTHER_PROBLEM, "hex2dec: bad value!\n");
-+ return 0;
-+ }
-+}
-+
-+/* takes a string with \xHH escapes and returns one with the characters
-+they stand for */
-+static char * pre_process(char * s)
-+{
-+ char * result = malloc(strlen(s) + 1);
-+ int sindex = 0, rrindex = 0;
-+ while( sindex < strlen(s) )
-+ {
-+ if( sindex + 3 < strlen(s) &&
-+ s[sindex] == '\\' && s[sindex+1] == 'x' &&
-+ isxdigit(s[sindex + 2]) && isxdigit(s[sindex + 3]) )
-+ {
-+ /* carefully remember to call tolower here... */
-+ result[rrindex] = tolower( hex2dec(s[sindex + 2])*16 +
-+ hex2dec(s[sindex + 3] ) );
-+
-+ switch ( result[rrindex] )
-+ {
-+ case 0x24:
-+ case 0x28:
-+ case 0x29:
-+ case 0x2a:
-+ case 0x2b:
-+ case 0x2e:
-+ case 0x3f:
-+ case 0x5b:
-+ case 0x5c:
-+ case 0x5d:
-+ case 0x5e:
-+ case 0x7c:
-+ fprintf(stderr,
-+ "Warning: layer7 regexp contains a control character, %c, in hex (\\x%c%c).\n"
-+ "I recommend that you write this as %c or \\%c, depending on what you meant.\n",
-+ result[rrindex], s[sindex + 2], s[sindex + 3], result[rrindex], result[rrindex]);
-+ break;
-+ case 0x00:
-+ fprintf(stderr,
-+ "Warning: null (\\x00) in layer7 regexp. A null terminates the regexp string!\n");
-+ break;
-+ default:
-+ break;
-+ }
-+
-+
-+ sindex += 3; /* 4 total */
-+ }
-+ else
-+ result[rrindex] = tolower(s[sindex]);
-+
-+ sindex++;
-+ rrindex++;
-+ }
-+ result[rrindex] = '\0';
-+
-+ return result;
-+}
-+
-+#define MAX_SUBDIRS 128
-+static char ** readl7dir(char * dirname)
-+{
-+ DIR * scratchdir;
-+ struct dirent ** namelist;
-+ char ** subdirs = malloc(MAX_SUBDIRS * sizeof(char *));
-+
-+ int n, d = 1;
-+ subdirs[0] = "";
-+
-+ n = scandir(dirname, &namelist, 0, alphasort);
-+
-+ if (n < 0)
-+ {
-+ perror("scandir");
-+ xtables_error(OTHER_PROBLEM, "Couldn't open %s\n", dirname);
-+ }
-+ else
-+ {
-+ while(n--)
-+ {
-+ char fulldirname[MAX_FN_LEN];
-+
-+ snprintf(fulldirname, MAX_FN_LEN, "%s/%s", dirname, namelist[n]->d_name);
-+
-+ if((scratchdir = opendir(fulldirname)) != NULL)
-+ {
-+ closedir(scratchdir);
-+
-+ if(!strcmp(namelist[n]->d_name, ".") ||
-+ !strcmp(namelist[n]->d_name, ".."))
-+ /* do nothing */ ;
-+ else
-+ {
-+ subdirs[d] = malloc(strlen(namelist[n]->d_name) + 1);
-+ strcpy(subdirs[d], namelist[n]->d_name);
-+ d++;
-+ if(d >= MAX_SUBDIRS - 1)
-+ {
-+ fprintf(stderr,
-+ "Too many subdirectories, skipping the rest!\n");
-+ break;
-+ }
-+ }
-+ }
-+ free(namelist[n]);
-+ }
-+ free(namelist);
-+ }
-+
-+ subdirs[d] = NULL;
-+
-+ return subdirs;
-+}
-+
-+static void parse_layer7_protocol(const char *s, struct xt_layer7_info *info)
-+{
-+ char filename[MAX_FN_LEN];
-+ char * dir = NULL;
-+ char ** subdirs;
-+ int n = 0, done = 0;
-+
-+ if(strlen(l7dir) > 0) dir = l7dir;
-+ else dir = "/etc/l7-protocols";
-+
-+ subdirs = readl7dir(dir);
-+
-+ while(subdirs[n] != NULL)
-+ {
-+ int c = snprintf(filename, MAX_FN_LEN, "%s/%s/%s.pat", dir, subdirs[n], s);
-+
-+ if(c > MAX_FN_LEN)
-+ xtables_error(OTHER_PROBLEM,
-+ "Filename beginning with %s is too long!\n", filename);
-+
-+ /* read in the pattern from the file */
-+ if(parse_protocol_file(filename, s, info)){
-+ done = 1;
-+ break;
-+ }
-+
-+ n++;
-+ }
-+
-+ if(!done)
-+ xtables_error(OTHER_PROBLEM,
-+ "Couldn't find a pattern definition file for %s.\n", s);
-+
-+ /* process \xHH escapes and tolower everything. (our regex lib has no
-+ case insensitivity option.) */
-+ strncpy(info->pattern, pre_process(info->pattern), MAX_PATTERN_LEN);
-+}
-+
-+/* Function which parses command options; returns true if it ate an option */
-+static int parse(int c, char **argv, int invert, unsigned int *flags,
-+ const void *entry, struct xt_entry_match **match)
-+{
-+ struct xt_layer7_info *layer7info =
-+ (struct xt_layer7_info *)(*match)->data;
-+
-+ switch (c) {
-+ case 'p':
-+ parse_layer7_protocol(argv[optind-1], layer7info);
-+ if (invert)
-+ layer7info->invert = true;
-+ *flags = 1;
-+ break;
-+
-+ case 'd':
-+ if(strlen(argv[optind-1]) >= MAX_FN_LEN)
-+ xtables_error(PARAMETER_PROBLEM, "directory name too long\n");
-+
-+ strncpy(l7dir, argv[optind-1], MAX_FN_LEN);
-+
-+ *flags = 1;
-+ break;
-+
-+ default:
-+ return 0;
-+ }
-+
-+ return 1;
-+}
-+
-+/* Final check; must have specified --l7proto */
-+static void final_check(unsigned int flags)
-+{
-+ if (!flags)
-+ xtables_error(PARAMETER_PROBLEM,
-+ "LAYER7 match: You must specify `--l7proto'");
-+}
-+
-+static void print_protocol(char s[], int invert, int numeric)
-+{
-+ fputs("l7proto ", stdout);
-+ if (invert) fputc('!', stdout);
-+ printf("%s ", s);
-+}
-+
-+/* Prints out the matchinfo. */
-+static void print(const void *ip,
-+ const struct xt_entry_match *match,
-+ int numeric)
-+{
-+ printf("LAYER7 ");
-+ print_protocol(((struct xt_layer7_info *)match->data)->protocol,
-+ ((struct xt_layer7_info *)match->data)->invert, numeric);
-+}
-+/* Saves the union ipt_matchinfo in parsable form to stdout. */
-+static void save(const void *ip, const struct xt_entry_match *match)
-+{
-+ const struct xt_layer7_info *info =
-+ (const struct xt_layer7_info*) match->data;
-+
-+ printf("--l7proto %s%s ", (info->invert)? "! ":"", info->protocol);
-+}
-+
-+static struct xtables_match layer7 = {
-+ .family = AF_INET,
-+ .name = "layer7",
-+ .version = XTABLES_VERSION,
-+ .size = XT_ALIGN(sizeof(struct xt_layer7_info)),
-+ .userspacesize = XT_ALIGN(sizeof(struct xt_layer7_info)),
-+ .help = &help,
-+ .parse = &parse,
-+ .final_check = &final_check,
-+ .print = &print,
-+ .save = &save,
-+ .extra_opts = opts
-+};
-+
-+void _init(void)
-+{
-+ xtables_register_match(&layer7);
-+}
projects / openwrt / staging / yousong.git / blobdiff