+++ /dev/null
-/*
- * m_ipt.c iptables based targets
- * utilities mostly ripped from iptables <duh, its the linux way>
- *
- * This program is free software; you can distribute 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.
- *
- * Authors: J Hadi Salim (hadi@cyberus.ca)
- *
- * TODO: bad bad hardcoding IPT_LIB_DIR and PROC_SYS_MODPROBE
- *
-*/
-
-#include <syslog.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <linux/types.h>
-#include <iptables.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include "utils.h"
-#include "tc_util.h"
-#include <linux/tc_act/tc_ipt.h>
-#include <stdio.h>
-#include <dlfcn.h>
-#include <getopt.h>
-#include <errno.h>
-#include <string.h>
-#include <netdb.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <stdarg.h>
-#include <limits.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-
-const char *pname = "tc-ipt";
-const char *tname = "mangle";
-const char *pversion = "0.1";
-
-#ifndef TRUE
-#define TRUE 1
-#endif
-#ifndef FALSE
-#define FALSE 0
-#endif
-
-#ifndef IPT_LIB_DIR
-#define IPT_LIB_DIR "/usr/local/lib/iptables"
-#endif
-
-#ifndef PROC_SYS_MODPROBE
-#define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
-#endif
-
-static const char *ipthooks[] = {
- "NF_IP_PRE_ROUTING",
- "NF_IP_LOCAL_IN",
- "NF_IP_FORWARD",
- "NF_IP_LOCAL_OUT",
- "NF_IP_POST_ROUTING",
-};
-
-static struct option original_opts[] = {
- {"jump", 1, 0, 'j'},
- {0, 0, 0, 0}
-};
-
-static struct iptables_target *t_list = NULL;
-static struct option *opts = original_opts;
-static unsigned int global_option_offset = 0;
-#define OPTION_OFFSET 256
-
-
-void
-register_target(struct iptables_target *me)
-{
-/* fprintf(stderr, "\nDummy register_target %s \n", me->name);
-*/
- me->next = t_list;
- t_list = me;
-
-}
-
-void
-exit_tryhelp(int status)
-{
- fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
- pname, pname);
- exit(status);
-}
-
-void
-exit_error(enum exittype status, char *msg, ...)
-{
- va_list args;
-
- va_start(args, msg);
- fprintf(stderr, "%s v%s: ", pname, pversion);
- vfprintf(stderr, msg, args);
- va_end(args);
- fprintf(stderr, "\n");
- if (status == PARAMETER_PROBLEM)
- exit_tryhelp(status);
- if (status == VERSION_PROBLEM)
- fprintf(stderr,
- "Perhaps iptables or your kernel needs to be upgraded.\n");
- exit(status);
-}
-
-/* stolen from iptables 1.2.11
-They should really have them as a library so i can link to them
-Email them next time i remember
-*/
-
-char *
-addr_to_dotted(const struct in_addr *addrp)
-{
- static char buf[20];
- const unsigned char *bytep;
-
- bytep = (const unsigned char *) &(addrp->s_addr);
- sprintf(buf, "%d.%d.%d.%d", bytep[0], bytep[1], bytep[2], bytep[3]);
- return buf;
-}
-
-int string_to_number_ll(const char *s, unsigned long long min,
- unsigned long long max,
- unsigned long long *ret)
-{
- unsigned long long number;
- char *end;
-
- /* Handle hex, octal, etc. */
- errno = 0;
- number = strtoull(s, &end, 0);
- if (*end == '\0' && end != s) {
- /* we parsed a number, let's see if we want this */
- if (errno != ERANGE && min <= number && (!max || number <= max)) {
- *ret = number;
- return 0;
- }
- }
- return -1;
-}
-
-int string_to_number_l(const char *s, unsigned long min, unsigned long max,
- unsigned long *ret)
-{
- int result;
- unsigned long long number;
-
- result = string_to_number_ll(s, min, max, &number);
- *ret = (unsigned long)number;
-
- return result;
-}
-
-int string_to_number(const char *s, unsigned int min, unsigned int max,
- unsigned int *ret)
-{
- int result;
- unsigned long number;
-
- result = string_to_number_l(s, min, max, &number);
- *ret = (unsigned int)number;
-
- return result;
-}
-
-static void free_opts(struct option *opts)
-{
- if (opts != original_opts) {
- free(opts);
- opts = original_opts;
- global_option_offset = 0;
- }
-}
-
-static struct option *
-merge_options(struct option *oldopts, const struct option *newopts,
- unsigned int *option_offset)
-{
- struct option *merge;
- unsigned int num_old, num_new, i;
-
- for (num_old = 0; oldopts[num_old].name; num_old++) ;
- for (num_new = 0; newopts[num_new].name; num_new++) ;
-
- *option_offset = global_option_offset + OPTION_OFFSET;
-
- merge = malloc(sizeof (struct option) * (num_new + num_old + 1));
- memcpy(merge, oldopts, num_old * sizeof (struct option));
- for (i = 0; i < num_new; i++) {
- merge[num_old + i] = newopts[i];
- merge[num_old + i].val += *option_offset;
- }
- memset(merge + num_old + num_new, 0, sizeof (struct option));
-
- return merge;
-}
-
-static void *
-fw_calloc(size_t count, size_t size)
-{
- void *p;
-
- if ((p = (void *) calloc(count, size)) == NULL) {
- perror("iptables: calloc failed");
- exit(1);
- }
- return p;
-}
-
-static struct iptables_target *
-find_t(char *name)
-{
- struct iptables_target *m;
- for (m = t_list; m; m = m->next) {
- if (strcmp(m->name, name) == 0)
- return m;
- }
-
- return NULL;
-}
-
-static struct iptables_target *
-get_target_name(char *name)
-{
- void *handle;
- char *error;
- char *new_name, *lname;
- struct iptables_target *m;
-
- char path[sizeof (IPT_LIB_DIR) + sizeof ("/libipt_.so") + strlen(name)];
-
- new_name = malloc(strlen(name) + 1);
- lname = malloc(strlen(name) + 1);
- if (new_name)
- memset(new_name, '\0', strlen(name) + 1);
- else
- exit_error(PARAMETER_PROBLEM, "get_target_name");
-
- if (lname)
- memset(lname, '\0', strlen(name) + 1);
- else
- exit_error(PARAMETER_PROBLEM, "get_target_name");
-
- strcpy(new_name, name);
- strcpy(lname, name);
-
- if (isupper(lname[0])) {
- int i;
- for (i = 0; i < strlen(name); i++) {
- lname[i] = tolower(lname[i]);
- }
- }
-
- if (islower(new_name[0])) {
- int i;
- for (i = 0; i < strlen(new_name); i++) {
- new_name[i] = toupper(new_name[i]);
- }
- }
-
- sprintf(path, IPT_LIB_DIR "/libipt_%s.so", new_name);
- handle = dlopen(path, RTLD_LAZY);
- if (!handle) {
- sprintf(path, IPT_LIB_DIR "/libipt_%s.so", lname);
- handle = dlopen(path, RTLD_LAZY);
- if (!handle) {
- fputs(dlerror(), stderr);
- printf("\n");
- return NULL;
- }
- }
-
- m = dlsym(handle, new_name);
- if ((error = dlerror()) != NULL) {
- m = (struct iptables_target *) dlsym(handle, lname);
- if ((error = dlerror()) != NULL) {
- m = find_t(new_name);
- if (NULL == m) {
- m = find_t(lname);
- if (NULL == m) {
- fputs(error, stderr);
- fprintf(stderr, "\n");
- dlclose(handle);
- return NULL;
- }
- }
- }
- }
-
- return m;
-}
-
-
-struct in_addr *dotted_to_addr(const char *dotted)
-{
- static struct in_addr addr;
- unsigned char *addrp;
- char *p, *q;
- unsigned int onebyte;
- int i;
- char buf[20];
-
- /* copy dotted string, because we need to modify it */
- strncpy(buf, dotted, sizeof (buf) - 1);
- addrp = (unsigned char *) &(addr.s_addr);
-
- p = buf;
- for (i = 0; i < 3; i++) {
- if ((q = strchr(p, '.')) == NULL)
- return (struct in_addr *) NULL;
-
- *q = '\0';
- if (string_to_number(p, 0, 255, &onebyte) == -1)
- return (struct in_addr *) NULL;
-
- addrp[i] = (unsigned char) onebyte;
- p = q + 1;
- }
-
- /* we've checked 3 bytes, now we check the last one */
- if (string_to_number(p, 0, 255, &onebyte) == -1)
- return (struct in_addr *) NULL;
-
- addrp[3] = (unsigned char) onebyte;
-
- return &addr;
-}
-
-static void set_revision(char *name, u_int8_t revision)
-{
- /* Old kernel sources don't have ".revision" field,
- * but we stole a byte from name. */
- name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
- name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
-}
-
-/*
- * we may need to check for version mismatch
-*/
-int
-build_st(struct iptables_target *target, struct ipt_entry_target *t)
-{
- unsigned int nfcache = 0;
-
- if (target) {
- size_t size;
-
- size =
- IPT_ALIGN(sizeof (struct ipt_entry_target)) + target->size;
-
- if (NULL == t) {
- target->t = fw_calloc(1, size);
- target->t->u.target_size = size;
-
- if (target->init != NULL)
- target->init(target->t, &nfcache);
- set_revision(target->t->u.user.name, target->revision);
- } else {
- target->t = t;
- }
- strcpy(target->t->u.user.name, target->name);
- return 0;
- }
-
- return -1;
-}
-
-static int parse_ipt(struct action_util *a,int *argc_p,
- char ***argv_p, int tca_id, struct nlmsghdr *n)
-{
- struct iptables_target *m = NULL;
- struct ipt_entry fw;
- struct rtattr *tail;
- int c;
- int rargc = *argc_p;
- char **argv = *argv_p;
- int argc = 0, iargc = 0;
- char k[16];
- int res = -1;
- int size = 0;
- int iok = 0, ok = 0;
- __u32 hook = 0, index = 0;
- res = 0;
-
- {
- int i;
- for (i = 0; i < rargc; i++) {
- if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
- break;
- }
- }
- iargc = argc = i;
- }
-
- if (argc <= 2) {
- fprintf(stderr,"bad arguements to ipt %d vs %d \n", argc, rargc);
- return -1;
- }
-
- while (1) {
- c = getopt_long(argc, argv, "j:", opts, NULL);
- if (c == -1)
- break;
- switch (c) {
- case 'j':
- m = get_target_name(optarg);
- if (NULL != m) {
-
- if (0 > build_st(m, NULL)) {
- printf(" %s error \n", m->name);
- return -1;
- }
- opts =
- merge_options(opts, m->extra_opts,
- &m->option_offset);
- } else {
- fprintf(stderr," failed to find target %s\n\n", optarg);
- return -1;
- }
- ok++;
- break;
-
- default:
- memset(&fw, 0, sizeof (fw));
- if (m) {
- m->parse(c - m->option_offset, argv, 0,
- &m->tflags, NULL, &m->t);
- } else {
- fprintf(stderr," failed to find target %s\n\n", optarg);
- return -1;
-
- }
- ok++;
- break;
-
- }
- }
-
- if (iargc > optind) {
- if (matches(argv[optind], "index") == 0) {
- if (get_u32(&index, argv[optind + 1], 10)) {
- fprintf(stderr, "Illegal \"index\"\n");
- free_opts(opts);
- return -1;
- }
- iok++;
-
- optind += 2;
- }
- }
-
- if (!ok && !iok) {
- fprintf(stderr," ipt Parser BAD!! (%s)\n", *argv);
- return -1;
- }
-
- /* check that we passed the correct parameters to the target */
- if (m)
- m->final_check(m->tflags);
-
- {
- struct tcmsg *t = NLMSG_DATA(n);
- if (t->tcm_parent != TC_H_ROOT
- && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
- hook = NF_IP_PRE_ROUTING;
- } else {
- hook = NF_IP_POST_ROUTING;
- }
- }
-
- tail = NLMSG_TAIL(n);
- addattr_l(n, MAX_MSG, tca_id, NULL, 0);
- fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
- fprintf(stdout, "\ttarget: ");
-
- if (m)
- m->print(NULL, m->t, 0);
- fprintf(stdout, " index %d\n", index);
-
- if (strlen(tname) > 16) {
- size = 16;
- k[15] = 0;
- } else {
- size = 1 + strlen(tname);
- }
- strncpy(k, tname, size);
-
- addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
- addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
- addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
- if (m)
- addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
- tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
-
- argc -= optind;
- argv += optind;
- *argc_p = rargc - iargc;
- *argv_p = argv;
-
- optind = 1;
- free_opts(opts);
-
- return 0;
-
-}
-
-static int
-print_ipt(struct action_util *au,FILE * f, struct rtattr *arg)
-{
- struct rtattr *tb[TCA_IPT_MAX + 1];
- struct ipt_entry_target *t = NULL;
-
- if (arg == NULL)
- return -1;
-
- parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
-
- if (tb[TCA_IPT_TABLE] == NULL) {
- fprintf(f, "[NULL ipt table name ] assuming mangle ");
- } else {
- fprintf(f, "tablename: %s ",
- (char *) RTA_DATA(tb[TCA_IPT_TABLE]));
- }
-
- if (tb[TCA_IPT_HOOK] == NULL) {
- fprintf(f, "[NULL ipt hook name ]\n ");
- return -1;
- } else {
- __u32 hook;
- hook = *(__u32 *) RTA_DATA(tb[TCA_IPT_HOOK]);
- fprintf(f, " hook: %s \n", ipthooks[hook]);
- }
-
- if (tb[TCA_IPT_TARG] == NULL) {
- fprintf(f, "\t[NULL ipt target parameters ] \n");
- return -1;
- } else {
- struct iptables_target *m = NULL;
- t = RTA_DATA(tb[TCA_IPT_TARG]);
- m = get_target_name(t->u.user.name);
- if (NULL != m) {
- if (0 > build_st(m, t)) {
- fprintf(stderr, " %s error \n", m->name);
- return -1;
- }
-
- opts =
- merge_options(opts, m->extra_opts,
- &m->option_offset);
- } else {
- fprintf(stderr, " failed to find target %s\n\n",
- t->u.user.name);
- return -1;
- }
- fprintf(f, "\ttarget ");
- m->print(NULL, m->t, 0);
- if (tb[TCA_IPT_INDEX] == NULL) {
- fprintf(f, " [NULL ipt target index ]\n");
- } else {
- __u32 index;
- index = *(__u32 *) RTA_DATA(tb[TCA_IPT_INDEX]);
- fprintf(f, " \n\tindex %d", index);
- }
-
- if (tb[TCA_IPT_CNT]) {
- struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);;
- fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
- }
- if (show_stats) {
- if (tb[TCA_IPT_TM]) {
- struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
- print_tm(f,tm);
- }
- }
- fprintf(f, " \n");
-
- }
- free_opts(opts);
-
- return 0;
-}
-
-struct action_util ipt_action_util = {
- .id = "ipt",
- .parse_aopt = parse_ipt,
- .print_aopt = print_ipt,
-};
-
git://git.onelab.eu / iproute2.git / blobdiff