/* * (C) 2000-2006 by the netfilter coreteam : * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(HAVE_LINUX_MAGIC_H) # include /* for PROC_SUPER_MAGIC */ #elif defined(HAVE_LINUX_PROC_FS_H) # include /* Linux 2.4 */ #else # define PROC_SUPER_MAGIC 0x9fa0 #endif #include #include /* INT_MAX in ip_tables.h/ip6_tables.h */ #include #include #include #ifndef NO_SHARED_LIBS #include #endif #ifndef IPT_SO_GET_REVISION_MATCH /* Old kernel source. */ # define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) # define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) #endif #ifndef IP6T_SO_GET_REVISION_MATCH /* Old kernel source. */ # define IP6T_SO_GET_REVISION_MATCH 68 # define IP6T_SO_GET_REVISION_TARGET 69 #endif #include #include "iptables/internal.h" #include "xshared.h" #define NPROTO 255 #ifndef PROC_SYS_MODPROBE #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" #endif /* we need this for ip6?tables-restore. ip6?tables-restore.c sets line to the * current line of the input file, in order to give a more precise error * message. ip6?tables itself doesn't need this, so it is initialized to the * magic number of -1 */ int line = -1; void basic_exit_err(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); struct xtables_globals *xt_params = NULL; void basic_exit_err(enum xtables_exittype status, const char *msg, ...) { va_list args; va_start(args, msg); fprintf(stderr, "%s v%s: ", xt_params->program_name, xt_params->program_version); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, "\n"); exit(status); } void xtables_free_opts(int unused) { if (xt_params->opts != xt_params->orig_opts) { free(xt_params->opts); xt_params->opts = NULL; } } struct option *xtables_merge_options(struct option *orig_opts, struct option *oldopts, const struct option *newopts, unsigned int *option_offset) { unsigned int num_oold = 0, num_old = 0, num_new = 0, i; struct option *merge, *mp; if (newopts == NULL) return oldopts; for (num_oold = 0; orig_opts[num_oold].name; num_oold++) ; if (oldopts != NULL) for (num_old = 0; oldopts[num_old].name; num_old++) ; for (num_new = 0; newopts[num_new].name; num_new++) ; /* * Since @oldopts also has @orig_opts already (and does so at the * start), skip these entries. */ if (oldopts != NULL) { oldopts += num_oold; num_old -= num_oold; } merge = malloc(sizeof(*mp) * (num_oold + num_old + num_new + 1)); if (merge == NULL) return NULL; /* Let the base options -[ADI...] have precedence over everything */ memcpy(merge, orig_opts, sizeof(*mp) * num_oold); mp = merge + num_oold; /* Second, the new options */ xt_params->option_offset += XT_OPTION_OFFSET_SCALE; *option_offset = xt_params->option_offset; memcpy(mp, newopts, sizeof(*mp) * num_new); for (i = 0; i < num_new; ++i, ++mp) mp->val += *option_offset; /* Third, the old options */ if (oldopts != NULL) { memcpy(mp, oldopts, sizeof(*mp) * num_old); mp += num_old; } xtables_free_opts(0); /* Clear trailing entry */ memset(mp, 0, sizeof(*mp)); return merge; } static const struct xtables_afinfo afinfo_ipv4 = { .kmod = "ip_tables", .proc_exists = "/proc/net/ip_tables_names", .libprefix = "libipt_", .family = NFPROTO_IPV4, .ipproto = IPPROTO_IP, .so_rev_match = IPT_SO_GET_REVISION_MATCH, .so_rev_target = IPT_SO_GET_REVISION_TARGET, }; static const struct xtables_afinfo afinfo_ipv6 = { .kmod = "ip6_tables", .proc_exists = "/proc/net/ip6_tables_names", .libprefix = "libip6t_", .family = NFPROTO_IPV6, .ipproto = IPPROTO_IPV6, .so_rev_match = IP6T_SO_GET_REVISION_MATCH, .so_rev_target = IP6T_SO_GET_REVISION_TARGET, }; /* Dummy families for arptables-compat and ebtables-compat. Leave structure * fields that we don't use unset. */ static const struct xtables_afinfo afinfo_bridge = { .libprefix = "libebt_", .family = NFPROTO_BRIDGE, }; static const struct xtables_afinfo afinfo_arp = { .libprefix = "libarpt_", .family = NFPROTO_ARP, }; const struct xtables_afinfo *afinfo; /* Search path for Xtables .so files */ static const char *xtables_libdir; /* the path to command to load kernel module */ const char *xtables_modprobe_program; /* Keep track of matches/targets pending full registration: linked lists. */ struct xtables_match *xtables_pending_matches; struct xtables_target *xtables_pending_targets; /* Keep track of fully registered external matches/targets: linked lists. */ struct xtables_match *xtables_matches; struct xtables_target *xtables_targets; /* Fully register a match/target which was previously partially registered. */ static bool xtables_fully_register_pending_match(struct xtables_match *me); static bool xtables_fully_register_pending_target(struct xtables_target *me); void xtables_init(void) { xtables_libdir = getenv("XTABLES_LIBDIR"); if (xtables_libdir != NULL) return; xtables_libdir = getenv("IPTABLES_LIB_DIR"); if (xtables_libdir != NULL) { fprintf(stderr, "IPTABLES_LIB_DIR is deprecated, " "use XTABLES_LIBDIR.\n"); return; } /* * Well yes, IP6TABLES_LIB_DIR is of lower priority over * IPTABLES_LIB_DIR since this moved to libxtables; I think that is ok * for these env vars are deprecated anyhow, and in light of the * (shared) libxt_*.so files, makes less sense to have * IPTABLES_LIB_DIR != IP6TABLES_LIB_DIR. */ xtables_libdir = getenv("IP6TABLES_LIB_DIR"); if (xtables_libdir != NULL) { fprintf(stderr, "IP6TABLES_LIB_DIR is deprecated, " "use XTABLES_LIBDIR.\n"); return; } xtables_libdir = XTABLES_LIBDIR; } void xtables_set_nfproto(uint8_t nfproto) { switch (nfproto) { case NFPROTO_IPV4: afinfo = &afinfo_ipv4; break; case NFPROTO_IPV6: afinfo = &afinfo_ipv6; break; case NFPROTO_BRIDGE: afinfo = &afinfo_bridge; break; case NFPROTO_ARP: afinfo = &afinfo_arp; break; default: fprintf(stderr, "libxtables: unhandled NFPROTO in %s\n", __func__); } } /** * xtables_set_params - set the global parameters used by xtables * @xtp: input xtables_globals structure * * The app is expected to pass a valid xtables_globals data-filled * with proper values * @xtp cannot be NULL * * Returns -1 on failure to set and 0 on success */ int xtables_set_params(struct xtables_globals *xtp) { if (!xtp) { fprintf(stderr, "%s: Illegal global params\n",__func__); return -1; } xt_params = xtp; if (!xt_params->exit_err) xt_params->exit_err = basic_exit_err; return 0; } int xtables_init_all(struct xtables_globals *xtp, uint8_t nfproto) { xtables_init(); xtables_set_nfproto(nfproto); return xtables_set_params(xtp); } /** * xtables_*alloc - wrappers that exit on failure */ void *xtables_calloc(size_t count, size_t size) { void *p; if ((p = calloc(count, size)) == NULL) { perror("ip[6]tables: calloc failed"); exit(1); } return p; } void *xtables_malloc(size_t size) { void *p; if ((p = malloc(size)) == NULL) { perror("ip[6]tables: malloc failed"); exit(1); } return p; } void *xtables_realloc(void *ptr, size_t size) { void *p; if ((p = realloc(ptr, size)) == NULL) { perror("ip[6]tables: realloc failed"); exit(1); } return p; } static char *get_modprobe(void) { int procfile; char *ret; int count; procfile = open(PROC_SYS_MODPROBE, O_RDONLY); if (procfile < 0) return NULL; if (fcntl(procfile, F_SETFD, FD_CLOEXEC) == -1) { fprintf(stderr, "Could not set close on exec: %s\n", strerror(errno)); exit(1); } ret = malloc(PATH_MAX); if (ret) { count = read(procfile, ret, PATH_MAX); if (count > 0 && count < PATH_MAX) { if (ret[count - 1] == '\n') ret[count - 1] = '\0'; else ret[count] = '\0'; close(procfile); return ret; } } free(ret); close(procfile); return NULL; } int xtables_insmod(const char *modname, const char *modprobe, bool quiet) { char *buf = NULL; char *argv[4]; int status; pid_t pid; /* If they don't explicitly set it, read out of kernel */ if (!modprobe) { buf = get_modprobe(); if (!buf) return -1; modprobe = buf; } argv[0] = (char *)modprobe; argv[1] = (char *)modname; argv[2] = quiet ? "-q" : NULL; argv[3] = NULL; /* * Need to flush the buffer, or the child may output it again * when switching the program thru execv. */ fflush(stdout); if (posix_spawn(&pid, argv[0], NULL, NULL, argv, NULL)) { free(buf); return -1; } else { waitpid(pid, &status, 0); } free(buf); if (WIFEXITED(status) && WEXITSTATUS(status) == 0) return 0; return -1; } /* return true if a given file exists within procfs */ static bool proc_file_exists(const char *filename) { struct stat s; struct statfs f; if (lstat(filename, &s)) return false; if (!S_ISREG(s.st_mode)) return false; if (statfs(filename, &f)) return false; if (f.f_type != PROC_SUPER_MAGIC) return false; return true; } int xtables_load_ko(const char *modprobe, bool quiet) { static bool loaded = false; int ret; if (loaded) return 0; if (proc_file_exists(afinfo->proc_exists)) { loaded = true; return 0; }; ret = xtables_insmod(afinfo->kmod, modprobe, quiet); if (ret == 0) loaded = true; return ret; } /** * xtables_strtou{i,l} - string to number conversion * @s: input string * @end: like strtoul's "end" pointer * @value: pointer for result * @min: minimum accepted value * @max: maximum accepted value * * If @end is NULL, we assume the caller wants a "strict strtoul", and hence * "15a" is rejected. * In either case, the value obtained is compared for min-max compliance. * Base is always 0, i.e. autodetect depending on @s. * * Returns true/false whether number was accepted. On failure, *value has * undefined contents. */ bool xtables_strtoul(const char *s, char **end, uintmax_t *value, uintmax_t min, uintmax_t max) { uintmax_t v; const char *p; char *my_end; errno = 0; /* Since strtoul allows leading minus, we have to check for ourself. */ for (p = s; isspace(*p); ++p) ; if (*p == '-') return false; v = strtoumax(s, &my_end, 0); if (my_end == s) return false; if (end != NULL) *end = my_end; if (errno != ERANGE && min <= v && (max == 0 || v <= max)) { if (value != NULL) *value = v; if (end == NULL) return *my_end == '\0'; return true; } return false; } bool xtables_strtoui(const char *s, char **end, unsigned int *value, unsigned int min, unsigned int max) { uintmax_t v; bool ret; ret = xtables_strtoul(s, end, &v, min, max); if (ret && value != NULL) *value = v; return ret; } int xtables_service_to_port(const char *name, const char *proto) { struct servent *service; if ((service = getservbyname(name, proto)) != NULL) return ntohs((unsigned short) service->s_port); return -1; } uint16_t xtables_parse_port(const char *port, const char *proto) { unsigned int portnum; if (xtables_strtoui(port, NULL, &portnum, 0, UINT16_MAX) || (portnum = xtables_service_to_port(port, proto)) != (unsigned)-1) return portnum; xt_params->exit_err(PARAMETER_PROBLEM, "invalid port/service `%s' specified", port); } void xtables_parse_interface(const char *arg, char *vianame, unsigned char *mask) { unsigned int vialen = strlen(arg); unsigned int i; memset(mask, 0, IFNAMSIZ); memset(vianame, 0, IFNAMSIZ); if (vialen + 1 > IFNAMSIZ) xt_params->exit_err(PARAMETER_PROBLEM, "interface name `%s' must be shorter than IFNAMSIZ" " (%i)", arg, IFNAMSIZ-1); strcpy(vianame, arg); if (vialen == 0) return; else if (vianame[vialen - 1] == '+') { memset(mask, 0xFF, vialen - 1); /* Don't remove `+' here! -HW */ } else { /* Include nul-terminator in match */ memset(mask, 0xFF, vialen + 1); } /* Display warning on invalid characters */ for (i = 0; vianame[i]; i++) { if (vianame[i] == '/' || vianame[i] == ' ') { fprintf(stderr, "Warning: weird character in interface" " `%s' ('/' and ' ' are not allowed by the kernel).\n", vianame); break; } } } #ifndef NO_SHARED_LIBS static void *load_extension(const char *search_path, const char *af_prefix, const char *name, bool is_target) { const char *all_prefixes[] = {af_prefix, "libxt_", NULL}; const char **prefix; const char *dir = search_path, *next; void *ptr = NULL; struct stat sb; char path[256]; do { next = strchr(dir, ':'); if (next == NULL) next = dir + strlen(dir); for (prefix = all_prefixes; *prefix != NULL; ++prefix) { snprintf(path, sizeof(path), "%.*s/%s%s.so", (unsigned int)(next - dir), dir, *prefix, name); if (stat(path, &sb) != 0) { if (errno == ENOENT) continue; fprintf(stderr, "%s: %s\n", path, strerror(errno)); return NULL; } if (dlopen(path, RTLD_NOW) == NULL) { fprintf(stderr, "%s: %s\n", path, dlerror()); break; } if (is_target) ptr = xtables_find_target(name, XTF_DONT_LOAD); else ptr = xtables_find_match(name, XTF_DONT_LOAD, NULL); if (ptr != NULL) return ptr; errno = ENOENT; return NULL; } dir = next + 1; } while (*next != '\0'); return NULL; } #endif static bool extension_cmp(const char *name1, const char *name2, uint32_t family) { if (strcmp(name1, name2) == 0 && (family == afinfo->family || family == NFPROTO_UNSPEC)) return true; return false; } struct xtables_match * xtables_find_match(const char *name, enum xtables_tryload tryload, struct xtables_rule_match **matches) { struct xtables_match **dptr; struct xtables_match *ptr; const char *icmp6 = "icmp6"; if (strlen(name) >= XT_EXTENSION_MAXNAMELEN) xtables_error(PARAMETER_PROBLEM, "Invalid match name \"%s\" (%u chars max)", name, XT_EXTENSION_MAXNAMELEN - 1); /* This is ugly as hell. Nonetheless, there is no way of changing * this without hurting backwards compatibility */ if ( (strcmp(name,"icmpv6") == 0) || (strcmp(name,"ipv6-icmp") == 0) || (strcmp(name,"icmp6") == 0) ) name = icmp6; /* Trigger delayed initialization */ for (dptr = &xtables_pending_matches; *dptr; ) { if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) { ptr = *dptr; *dptr = (*dptr)->next; if (xtables_fully_register_pending_match(ptr)) continue; *dptr = ptr; } dptr = &((*dptr)->next); } for (ptr = xtables_matches; ptr; ptr = ptr->next) { if (extension_cmp(name, ptr->name, ptr->family)) { struct xtables_match *clone; /* First match of this type: */ if (ptr->m == NULL) break; /* Second and subsequent clones */ clone = xtables_malloc(sizeof(struct xtables_match)); memcpy(clone, ptr, sizeof(struct xtables_match)); clone->udata = NULL; clone->mflags = 0; /* This is a clone: */ clone->next = clone; ptr = clone; break; } } #ifndef NO_SHARED_LIBS if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { ptr = load_extension(xtables_libdir, afinfo->libprefix, name, false); if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) xt_params->exit_err(PARAMETER_PROBLEM, "Couldn't load match `%s':%s\n", name, strerror(errno)); } #else if (ptr && !ptr->loaded) { if (tryload != XTF_DONT_LOAD) ptr->loaded = 1; else ptr = NULL; } if(!ptr && (tryload == XTF_LOAD_MUST_SUCCEED)) { xt_params->exit_err(PARAMETER_PROBLEM, "Couldn't find match `%s'\n", name); } #endif if (ptr && matches) { struct xtables_rule_match **i; struct xtables_rule_match *newentry; newentry = xtables_malloc(sizeof(struct xtables_rule_match)); for (i = matches; *i; i = &(*i)->next) { if (extension_cmp(name, (*i)->match->name, (*i)->match->family)) (*i)->completed = true; } newentry->match = ptr; newentry->completed = false; newentry->next = NULL; *i = newentry; } return ptr; } struct xtables_match * xtables_find_match_revision(const char *name, enum xtables_tryload tryload, struct xtables_match *match, int revision) { if (!match) { match = xtables_find_match(name, tryload, NULL); if (!match) return NULL; } while (1) { if (match->revision == revision) return match; match = match->next; if (!match) return NULL; if (!extension_cmp(name, match->name, match->family)) return NULL; } } struct xtables_target * xtables_find_target(const char *name, enum xtables_tryload tryload) { struct xtables_target **dptr; struct xtables_target *ptr; /* Standard target? */ if (strcmp(name, "") == 0 || strcmp(name, XTC_LABEL_ACCEPT) == 0 || strcmp(name, XTC_LABEL_DROP) == 0 || strcmp(name, XTC_LABEL_QUEUE) == 0 || strcmp(name, XTC_LABEL_RETURN) == 0) name = "standard"; /* Trigger delayed initialization */ for (dptr = &xtables_pending_targets; *dptr; ) { if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) { ptr = *dptr; *dptr = (*dptr)->next; if (xtables_fully_register_pending_target(ptr)) continue; *dptr = ptr; } dptr = &((*dptr)->next); } for (ptr = xtables_targets; ptr; ptr = ptr->next) { if (extension_cmp(name, ptr->name, ptr->family)) { struct xtables_target *clone; /* First target of this type: */ if (ptr->t == NULL) break; /* Second and subsequent clones */ clone = xtables_malloc(sizeof(struct xtables_target)); memcpy(clone, ptr, sizeof(struct xtables_target)); clone->udata = NULL; clone->tflags = 0; /* This is a clone: */ clone->next = clone; ptr = clone; break; } } #ifndef NO_SHARED_LIBS if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { ptr = load_extension(xtables_libdir, afinfo->libprefix, name, true); if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) xt_params->exit_err(PARAMETER_PROBLEM, "Couldn't load target `%s':%s\n", name, strerror(errno)); } #else if (ptr && !ptr->loaded) { if (tryload != XTF_DONT_LOAD) ptr->loaded = 1; else ptr = NULL; } if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) { xt_params->exit_err(PARAMETER_PROBLEM, "Couldn't find target `%s'\n", name); } #endif if (ptr) ptr->used = 1; return ptr; } struct xtables_target * xtables_find_target_revision(const char *name, enum xtables_tryload tryload, struct xtables_target *target, int revision) { if (!target) { target = xtables_find_target(name, tryload); if (!target) return NULL; } while (1) { if (target->revision == revision) return target; target = target->next; if (!target) return NULL; if (!extension_cmp(name, target->name, target->family)) return NULL; } } int xtables_compatible_revision(const char *name, uint8_t revision, int opt) { struct xt_get_revision rev; socklen_t s = sizeof(rev); int max_rev, sockfd; sockfd = socket(afinfo->family, SOCK_RAW, IPPROTO_RAW); if (sockfd < 0) { if (errno == EPERM) { /* revision 0 is always supported. */ if (revision != 0) fprintf(stderr, "%s: Could not determine whether " "revision %u is supported, " "assuming it is.\n", name, revision); return 1; } fprintf(stderr, "Could not open socket to kernel: %s\n", strerror(errno)); exit(1); } if (fcntl(sockfd, F_SETFD, FD_CLOEXEC) == -1) { fprintf(stderr, "Could not set close on exec: %s\n", strerror(errno)); exit(1); } xtables_load_ko(xtables_modprobe_program, true); strcpy(rev.name, name); rev.revision = revision; max_rev = getsockopt(sockfd, afinfo->ipproto, opt, &rev, &s); if (max_rev < 0) { /* Definitely don't support this? */ if (errno == ENOENT || errno == EPROTONOSUPPORT) { close(sockfd); return 0; } else if (errno == ENOPROTOOPT) { close(sockfd); /* Assume only revision 0 support (old kernel) */ return (revision == 0); } else { fprintf(stderr, "getsockopt failed strangely: %s\n", strerror(errno)); exit(1); } } close(sockfd); return 1; } static int compatible_match_revision(const char *name, uint8_t revision) { return xt_params->compat_rev(name, revision, afinfo->so_rev_match); } static int compatible_target_revision(const char *name, uint8_t revision) { return xt_params->compat_rev(name, revision, afinfo->so_rev_target); } static void xtables_check_options(const char *name, const struct option *opt) { for (; opt->name != NULL; ++opt) if (opt->val < 0 || opt->val >= XT_OPTION_OFFSET_SCALE) { fprintf(stderr, "%s: Extension %s uses invalid " "option value %d\n",xt_params->program_name, name, opt->val); exit(1); } } void xtables_register_match(struct xtables_match *me) { if (me->next) { fprintf(stderr, "%s: match \"%s\" already registered\n", xt_params->program_name, me->name); exit(1); } if (me->version == NULL) { fprintf(stderr, "%s: match %s<%u> is missing a version\n", xt_params->program_name, me->name, me->revision); exit(1); } if (me->size != XT_ALIGN(me->size)) { fprintf(stderr, "%s: match \"%s\" has invalid size %u.\n", xt_params->program_name, me->name, (unsigned int)me->size); exit(1); } if (strcmp(me->version, XTABLES_VERSION) != 0) { fprintf(stderr, "%s: match \"%s\" has version \"%s\", " "but \"%s\" is required.\n", xt_params->program_name, me->name, me->version, XTABLES_VERSION); exit(1); } if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { fprintf(stderr, "%s: match `%s' has invalid name\n", xt_params->program_name, me->name); exit(1); } if (me->real_name && strlen(me->real_name) >= XT_EXTENSION_MAXNAMELEN) { fprintf(stderr, "%s: match `%s' has invalid real name\n", xt_params->program_name, me->real_name); exit(1); } if (me->family >= NPROTO) { fprintf(stderr, "%s: BUG: match %s has invalid protocol family\n", xt_params->program_name, me->name); exit(1); } if (me->x6_options != NULL) xtables_option_metavalidate(me->name, me->x6_options); if (me->extra_opts != NULL) xtables_check_options(me->name, me->extra_opts); /* place on linked list of matches pending full registration */ me->next = xtables_pending_matches; xtables_pending_matches = me; } /** * Compare two actions for their preference * @a: one action * @b: another * * Like strcmp, returns a negative number if @a is less preferred than @b, * positive number if @a is more preferred than @b, or zero if equally * preferred. */ static int xtables_mt_prefer(bool a_alias, unsigned int a_rev, unsigned int a_fam, bool b_alias, unsigned int b_rev, unsigned int b_fam) { /* * Alias ranks higher than no alias. * (We want the new action to be used whenever possible.) */ if (!a_alias && b_alias) return -1; if (a_alias && !b_alias) return 1; /* Higher revision ranks higher. */ if (a_rev < b_rev) return -1; if (a_rev > b_rev) return 1; /* NFPROTO_ ranks higher than NFPROTO_UNSPEC. */ if (a_fam == NFPROTO_UNSPEC && b_fam != NFPROTO_UNSPEC) return -1; if (a_fam != NFPROTO_UNSPEC && b_fam == NFPROTO_UNSPEC) return 1; /* Must be the same thing. */ return 0; } static int xtables_match_prefer(const struct xtables_match *a, const struct xtables_match *b) { return xtables_mt_prefer(a->real_name != NULL, a->revision, a->family, b->real_name != NULL, b->revision, b->family); } static int xtables_target_prefer(const struct xtables_target *a, const struct xtables_target *b) { /* * Note that if x->real_name==NULL, it will be set to x->name in * xtables_register_*; the direct pointer comparison here is therefore * legitimate to detect an alias. */ return xtables_mt_prefer(a->real_name != NULL, a->revision, a->family, b->real_name != NULL, b->revision, b->family); } static bool xtables_fully_register_pending_match(struct xtables_match *me) { struct xtables_match **i, *old, *pos = NULL; const char *rn; int compare; /* See if new match can be used. */ rn = (me->real_name != NULL) ? me->real_name : me->name; if (!compatible_match_revision(rn, me->revision)) return false; old = xtables_find_match(me->name, XTF_DURING_LOAD, NULL); while (old) { compare = xtables_match_prefer(old, me); if (compare == 0) { fprintf(stderr, "%s: match `%s' already registered.\n", xt_params->program_name, me->name); exit(1); } /* Now we have two (or more) options, check compatibility. */ rn = (old->real_name != NULL) ? old->real_name : old->name; if (compare > 0) { /* Kernel tells old isn't compatible anymore??? */ if (!compatible_match_revision(rn, old->revision)) { /* Delete old one. */ for (i = &xtables_matches; *i != old;) i = &(*i)->next; *i = old->next; } pos = old; old = old->next; if (!old) break; if (!extension_cmp(me->name, old->name, old->family)) break; continue; } /* Found right old */ pos = old; break; } if (!pos) { /* Append to list. */ for (i = &xtables_matches; *i; i = &(*i)->next); } else if (compare < 0) { /* Prepend it */ for (i = &xtables_matches; *i != pos; i = &(*i)->next); } else if (compare > 0) { /* Append it */ i = &pos->next; pos = pos->next; } me->next = pos; *i = me; me->m = NULL; me->mflags = 0; return true; } void xtables_register_matches(struct xtables_match *match, unsigned int n) { do { xtables_register_match(&match[--n]); } while (n > 0); } void xtables_register_target(struct xtables_target *me) { if (me->next) { fprintf(stderr, "%s: target \"%s\" already registered\n", xt_params->program_name, me->name); exit(1); } if (me->version == NULL) { fprintf(stderr, "%s: target %s<%u> is missing a version\n", xt_params->program_name, me->name, me->revision); exit(1); } if (me->size != XT_ALIGN(me->size)) { fprintf(stderr, "%s: target \"%s\" has invalid size %u.\n", xt_params->program_name, me->name, (unsigned int)me->size); exit(1); } if (strcmp(me->version, XTABLES_VERSION) != 0) { fprintf(stderr, "%s: target \"%s\" has version \"%s\", " "but \"%s\" is required.\n", xt_params->program_name, me->name, me->version, XTABLES_VERSION); exit(1); } if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { fprintf(stderr, "%s: target `%s' has invalid name\n", xt_params->program_name, me->name); exit(1); } if (me->real_name && strlen(me->real_name) >= XT_EXTENSION_MAXNAMELEN) { fprintf(stderr, "%s: target `%s' has invalid real name\n", xt_params->program_name, me->real_name); exit(1); } if (me->family >= NPROTO) { fprintf(stderr, "%s: BUG: target %s has invalid protocol family\n", xt_params->program_name, me->name); exit(1); } if (me->x6_options != NULL) xtables_option_metavalidate(me->name, me->x6_options); if (me->extra_opts != NULL) xtables_check_options(me->name, me->extra_opts); /* ignore not interested target */ if (me->family != afinfo->family && me->family != AF_UNSPEC) return; /* place on linked list of targets pending full registration */ me->next = xtables_pending_targets; xtables_pending_targets = me; } static bool xtables_fully_register_pending_target(struct xtables_target *me) { struct xtables_target **i, *old, *pos = NULL; const char *rn; int compare; if (strcmp(me->name, "standard") != 0) { /* See if new target can be used. */ rn = (me->real_name != NULL) ? me->real_name : me->name; if (!compatible_target_revision(rn, me->revision)) return false; } old = xtables_find_target(me->name, XTF_DURING_LOAD); while (old) { compare = xtables_target_prefer(old, me); if (compare == 0) { fprintf(stderr, "%s: target `%s' already registered.\n", xt_params->program_name, me->name); exit(1); } /* Now we have two (or more) options, check compatibility. */ rn = (old->real_name != NULL) ? old->real_name : old->name; if (compare > 0) { /* Kernel tells old isn't compatible anymore??? */ if (!compatible_target_revision(rn, old->revision)) { /* Delete old one. */ for (i = &xtables_targets; *i != old;) i = &(*i)->next; *i = old->next; } pos = old; old = old->next; if (!old) break; if (!extension_cmp(me->name, old->name, old->family)) break; continue; } /* Found right old */ pos = old; break; } if (!pos) { /* Prepend to list. */ i = &xtables_targets; pos = xtables_targets; } else if (compare < 0) { /* Prepend it */ for (i = &xtables_targets; *i != pos; i = &(*i)->next); } else if (compare > 0) { /* Append it */ i = &pos->next; pos = pos->next; } me->next = pos; *i = me; me->t = NULL; me->tflags = 0; return true; } void xtables_register_targets(struct xtables_target *target, unsigned int n) { do { xtables_register_target(&target[--n]); } while (n > 0); } /* receives a list of xtables_rule_match, release them */ void xtables_rule_matches_free(struct xtables_rule_match **matches) { struct xtables_rule_match *matchp, *tmp; for (matchp = *matches; matchp;) { tmp = matchp->next; if (matchp->match->m) { free(matchp->match->m); matchp->match->m = NULL; } if (matchp->match == matchp->match->next) { free(matchp->match); matchp->match = NULL; } free(matchp); matchp = tmp; } *matches = NULL; } /** * xtables_param_act - act on condition * @status: a constant from enum xtables_exittype * * %XTF_ONLY_ONCE: print error message that option may only be used once. * @p1: module name (e.g. "mark") * @p2(...): option in conflict (e.g. "--mark") * @p3(...): condition to match on (see extensions/ for examples) * * %XTF_NO_INVERT: option does not support inversion * @p1: module name * @p2: option in conflict * @p3: condition to match on * * %XTF_BAD_VALUE: bad value for option * @p1: module name * @p2: option with which the problem occurred (e.g. "--mark") * @p3: string the user passed in (e.g. "99999999999999") * * %XTF_ONE_ACTION: two mutually exclusive actions have been specified * @p1: module name * * Displays an error message and exits the program. */ void xtables_param_act(unsigned int status, const char *p1, ...) { const char *p2, *p3; va_list args; bool b; va_start(args, p1); switch (status) { case XTF_ONLY_ONCE: p2 = va_arg(args, const char *); b = va_arg(args, unsigned int); if (!b) { va_end(args); return; } xt_params->exit_err(PARAMETER_PROBLEM, "%s: \"%s\" option may only be specified once", p1, p2); break; case XTF_NO_INVERT: p2 = va_arg(args, const char *); b = va_arg(args, unsigned int); if (!b) { va_end(args); return; } xt_params->exit_err(PARAMETER_PROBLEM, "%s: \"%s\" option cannot be inverted", p1, p2); break; case XTF_BAD_VALUE: p2 = va_arg(args, const char *); p3 = va_arg(args, const char *); xt_params->exit_err(PARAMETER_PROBLEM, "%s: Bad value for \"%s\" option: \"%s\"", p1, p2, p3); break; case XTF_ONE_ACTION: b = va_arg(args, unsigned int); if (!b) { va_end(args); return; } xt_params->exit_err(PARAMETER_PROBLEM, "%s: At most one action is possible", p1); break; default: xt_params->exit_err(status, p1, args); break; } va_end(args); } const char *xtables_ipaddr_to_numeric(const struct in_addr *addrp) { static char buf[20]; const unsigned char *bytep = (const void *)&addrp->s_addr; sprintf(buf, "%u.%u.%u.%u", bytep[0], bytep[1], bytep[2], bytep[3]); return buf; } static const char *ipaddr_to_host(const struct in_addr *addr) { static char hostname[NI_MAXHOST]; struct sockaddr_in saddr = { .sin_family = AF_INET, .sin_addr = *addr, }; int err; err = getnameinfo((const void *)&saddr, sizeof(struct sockaddr_in), hostname, sizeof(hostname) - 1, NULL, 0, 0); if (err != 0) return NULL; return hostname; } static const char *ipaddr_to_network(const struct in_addr *addr) { struct netent *net; if ((net = getnetbyaddr(ntohl(addr->s_addr), AF_INET)) != NULL) return net->n_name; return NULL; } const char *xtables_ipaddr_to_anyname(const struct in_addr *addr) { const char *name; if ((name = ipaddr_to_host(addr)) != NULL || (name = ipaddr_to_network(addr)) != NULL) return name; return xtables_ipaddr_to_numeric(addr); } int xtables_ipmask_to_cidr(const struct in_addr *mask) { uint32_t maskaddr, bits; int i; maskaddr = ntohl(mask->s_addr); /* shortcut for /32 networks */ if (maskaddr == 0xFFFFFFFFL) return 32; i = 32; bits = 0xFFFFFFFEL; while (--i >= 0 && maskaddr != bits) bits <<= 1; if (i >= 0) return i; /* this mask cannot be converted to CIDR notation */ return -1; } const char *xtables_ipmask_to_numeric(const struct in_addr *mask) { static char buf[20]; uint32_t cidr; cidr = xtables_ipmask_to_cidr(mask); if (cidr == (unsigned int)-1) { /* mask was not a decent combination of 1's and 0's */ sprintf(buf, "/%s", xtables_ipaddr_to_numeric(mask)); return buf; } else if (cidr == 32) { /* we don't want to see "/32" */ return ""; } sprintf(buf, "/%d", cidr); return buf; } static struct in_addr *__numeric_to_ipaddr(const char *dotted, bool is_mask) { static struct in_addr addr; unsigned char *addrp; unsigned int onebyte; char buf[20], *p, *q; int i; /* copy dotted string, because we need to modify it */ strncpy(buf, dotted, sizeof(buf) - 1); buf[sizeof(buf) - 1] = '\0'; addrp = (void *)&addr.s_addr; p = buf; for (i = 0; i < 3; ++i) { if ((q = strchr(p, '.')) == NULL) { if (is_mask) return NULL; /* autocomplete, this is a network address */ if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) return NULL; addrp[i] = onebyte; while (i < 3) addrp[++i] = 0; return &addr; } *q = '\0'; if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) return NULL; addrp[i] = onebyte; p = q + 1; } /* we have checked 3 bytes, now we check the last one */ if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) return NULL; addrp[3] = onebyte; return &addr; } struct in_addr *xtables_numeric_to_ipaddr(const char *dotted) { return __numeric_to_ipaddr(dotted, false); } struct in_addr *xtables_numeric_to_ipmask(const char *dotted) { return __numeric_to_ipaddr(dotted, true); } static struct in_addr *network_to_ipaddr(const char *name) { static struct in_addr addr; struct netent *net; if ((net = getnetbyname(name)) != NULL) { if (net->n_addrtype != AF_INET) return NULL; addr.s_addr = htonl(net->n_net); return &addr; } return NULL; } static struct in_addr *host_to_ipaddr(const char *name, unsigned int *naddr) { struct in_addr *addr; struct addrinfo hints; struct addrinfo *res, *p; int err; unsigned int i; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET; hints.ai_socktype = SOCK_RAW; *naddr = 0; err = getaddrinfo(name, NULL, &hints, &res); if (err != 0) return NULL; for (p = res; p != NULL; p = p->ai_next) ++*naddr; addr = xtables_calloc(*naddr, sizeof(struct in_addr)); for (i = 0, p = res; p != NULL; p = p->ai_next) memcpy(&addr[i++], &((const struct sockaddr_in *)p->ai_addr)->sin_addr, sizeof(struct in_addr)); freeaddrinfo(res); return addr; } static struct in_addr * ipparse_hostnetwork(const char *name, unsigned int *naddrs) { struct in_addr *addrptmp, *addrp; if ((addrptmp = xtables_numeric_to_ipaddr(name)) != NULL || (addrptmp = network_to_ipaddr(name)) != NULL) { addrp = xtables_malloc(sizeof(struct in_addr)); memcpy(addrp, addrptmp, sizeof(*addrp)); *naddrs = 1; return addrp; } if ((addrptmp = host_to_ipaddr(name, naddrs)) != NULL) return addrptmp; xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); } static struct in_addr *parse_ipmask(const char *mask) { static struct in_addr maskaddr; struct in_addr *addrp; unsigned int bits; if (mask == NULL) { /* no mask at all defaults to 32 bits */ maskaddr.s_addr = 0xFFFFFFFF; return &maskaddr; } if ((addrp = xtables_numeric_to_ipmask(mask)) != NULL) /* dotted_to_addr already returns a network byte order addr */ return addrp; if (!xtables_strtoui(mask, NULL, &bits, 0, 32)) xt_params->exit_err(PARAMETER_PROBLEM, "invalid mask `%s' specified", mask); if (bits != 0) { maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits)); return &maskaddr; } maskaddr.s_addr = 0U; return &maskaddr; } void xtables_ipparse_multiple(const char *name, struct in_addr **addrpp, struct in_addr **maskpp, unsigned int *naddrs) { struct in_addr *addrp; char buf[256], *p, *next; unsigned int len, i, j, n, count = 1; const char *loop = name; while ((loop = strchr(loop, ',')) != NULL) { ++count; ++loop; /* skip ',' */ } *addrpp = xtables_malloc(sizeof(struct in_addr) * count); *maskpp = xtables_malloc(sizeof(struct in_addr) * count); loop = name; for (i = 0; i < count; ++i) { while (isspace(*loop)) ++loop; next = strchr(loop, ','); if (next != NULL) len = next - loop; else len = strlen(loop); if (len > sizeof(buf) - 1) xt_params->exit_err(PARAMETER_PROBLEM, "Hostname too long"); strncpy(buf, loop, len); buf[len] = '\0'; if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_ipmask(p + 1); } else { addrp = parse_ipmask(NULL); } memcpy(*maskpp + i, addrp, sizeof(*addrp)); /* if a null mask is given, the name is ignored, like in "any/0" */ if ((*maskpp + i)->s_addr == 0) /* * A bit pointless to process multiple addresses * in this case... */ strcpy(buf, "0.0.0.0"); addrp = ipparse_hostnetwork(buf, &n); if (n > 1) { count += n - 1; *addrpp = xtables_realloc(*addrpp, sizeof(struct in_addr) * count); *maskpp = xtables_realloc(*maskpp, sizeof(struct in_addr) * count); for (j = 0; j < n; ++j) /* for each new addr */ memcpy(*addrpp + i + j, addrp + j, sizeof(*addrp)); for (j = 1; j < n; ++j) /* for each new mask */ memcpy(*maskpp + i + j, *maskpp + i, sizeof(*addrp)); i += n - 1; } else { memcpy(*addrpp + i, addrp, sizeof(*addrp)); } /* free what ipparse_hostnetwork had allocated: */ free(addrp); if (next == NULL) break; loop = next + 1; } *naddrs = count; for (i = 0; i < count; ++i) (*addrpp+i)->s_addr &= (*maskpp+i)->s_addr; } /** * xtables_ipparse_any - transform arbitrary name to in_addr * * Possible inputs (pseudo regex): * m{^($hostname|$networkname|$ipaddr)(/$mask)?} * "1.2.3.4/5", "1.2.3.4", "hostname", "networkname" */ void xtables_ipparse_any(const char *name, struct in_addr **addrpp, struct in_addr *maskp, unsigned int *naddrs) { unsigned int i, j, k, n; struct in_addr *addrp; char buf[256], *p; strncpy(buf, name, sizeof(buf) - 1); buf[sizeof(buf) - 1] = '\0'; if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_ipmask(p + 1); } else { addrp = parse_ipmask(NULL); } memcpy(maskp, addrp, sizeof(*maskp)); /* if a null mask is given, the name is ignored, like in "any/0" */ if (maskp->s_addr == 0U) strcpy(buf, "0.0.0.0"); addrp = *addrpp = ipparse_hostnetwork(buf, naddrs); n = *naddrs; for (i = 0, j = 0; i < n; ++i) { addrp[j++].s_addr &= maskp->s_addr; for (k = 0; k < j - 1; ++k) if (addrp[k].s_addr == addrp[j-1].s_addr) { /* * Nuke the dup by copying an address from the * tail here, and check the current position * again (--j). */ memcpy(&addrp[--j], &addrp[--*naddrs], sizeof(struct in_addr)); break; } } } const char *xtables_ip6addr_to_numeric(const struct in6_addr *addrp) { /* 0000:0000:0000:0000:0000:0000:000.000.000.000 * 0000:0000:0000:0000:0000:0000:0000:0000 */ static char buf[50+1]; return inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); } static const char *ip6addr_to_host(const struct in6_addr *addr) { static char hostname[NI_MAXHOST]; struct sockaddr_in6 saddr; int err; memset(&saddr, 0, sizeof(struct sockaddr_in6)); memcpy(&saddr.sin6_addr, addr, sizeof(*addr)); saddr.sin6_family = AF_INET6; err = getnameinfo((const void *)&saddr, sizeof(struct sockaddr_in6), hostname, sizeof(hostname) - 1, NULL, 0, 0); if (err != 0) return NULL; return hostname; } const char *xtables_ip6addr_to_anyname(const struct in6_addr *addr) { const char *name; if ((name = ip6addr_to_host(addr)) != NULL) return name; return xtables_ip6addr_to_numeric(addr); } int xtables_ip6mask_to_cidr(const struct in6_addr *k) { unsigned int bits = 0; uint32_t a, b, c, d; a = ntohl(k->s6_addr32[0]); b = ntohl(k->s6_addr32[1]); c = ntohl(k->s6_addr32[2]); d = ntohl(k->s6_addr32[3]); while (a & 0x80000000U) { ++bits; a <<= 1; a |= (b >> 31) & 1; b <<= 1; b |= (c >> 31) & 1; c <<= 1; c |= (d >> 31) & 1; d <<= 1; } if (a != 0 || b != 0 || c != 0 || d != 0) return -1; return bits; } const char *xtables_ip6mask_to_numeric(const struct in6_addr *addrp) { static char buf[50+2]; int l = xtables_ip6mask_to_cidr(addrp); if (l == -1) { strcpy(buf, "/"); strcat(buf, xtables_ip6addr_to_numeric(addrp)); return buf; } /* we don't want to see "/128" */ if (l == 128) return ""; else sprintf(buf, "/%d", l); return buf; } struct in6_addr *xtables_numeric_to_ip6addr(const char *num) { static struct in6_addr ap; int err; if ((err = inet_pton(AF_INET6, num, &ap)) == 1) return ≈ return NULL; } static struct in6_addr * host_to_ip6addr(const char *name, unsigned int *naddr) { struct in6_addr *addr; struct addrinfo hints; struct addrinfo *res, *p; int err; unsigned int i; memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET6; hints.ai_socktype = SOCK_RAW; *naddr = 0; err = getaddrinfo(name, NULL, &hints, &res); if (err != 0) return NULL; /* Find length of address chain */ for (p = res; p != NULL; p = p->ai_next) ++*naddr; /* Copy each element of the address chain */ addr = xtables_calloc(*naddr, sizeof(struct in6_addr)); for (i = 0, p = res; p != NULL; p = p->ai_next) memcpy(&addr[i++], &((const struct sockaddr_in6 *)p->ai_addr)->sin6_addr, sizeof(struct in6_addr)); freeaddrinfo(res); return addr; } static struct in6_addr *network_to_ip6addr(const char *name) { /* abort();*/ /* TODO: not implemented yet, but the exception breaks the * name resolvation */ return NULL; } static struct in6_addr * ip6parse_hostnetwork(const char *name, unsigned int *naddrs) { struct in6_addr *addrp, *addrptmp; if ((addrptmp = xtables_numeric_to_ip6addr(name)) != NULL || (addrptmp = network_to_ip6addr(name)) != NULL) { addrp = xtables_malloc(sizeof(struct in6_addr)); memcpy(addrp, addrptmp, sizeof(*addrp)); *naddrs = 1; return addrp; } if ((addrp = host_to_ip6addr(name, naddrs)) != NULL) return addrp; xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); } static struct in6_addr *parse_ip6mask(char *mask) { static struct in6_addr maskaddr; struct in6_addr *addrp; unsigned int bits; if (mask == NULL) { /* no mask at all defaults to 128 bits */ memset(&maskaddr, 0xff, sizeof maskaddr); return &maskaddr; } if ((addrp = xtables_numeric_to_ip6addr(mask)) != NULL) return addrp; if (!xtables_strtoui(mask, NULL, &bits, 0, 128)) xt_params->exit_err(PARAMETER_PROBLEM, "invalid mask `%s' specified", mask); if (bits != 0) { char *p = (void *)&maskaddr; memset(p, 0xff, bits / 8); memset(p + ((bits + 7) / 8), 0, (128 - bits) / 8); if (bits < 128) p[bits/8] = 0xff << (8 - (bits & 7)); return &maskaddr; } memset(&maskaddr, 0, sizeof(maskaddr)); return &maskaddr; } void xtables_ip6parse_multiple(const char *name, struct in6_addr **addrpp, struct in6_addr **maskpp, unsigned int *naddrs) { static const struct in6_addr zero_addr; struct in6_addr *addrp; char buf[256], *p, *next; unsigned int len, i, j, n, count = 1; const char *loop = name; while ((loop = strchr(loop, ',')) != NULL) { ++count; ++loop; /* skip ',' */ } *addrpp = xtables_malloc(sizeof(struct in6_addr) * count); *maskpp = xtables_malloc(sizeof(struct in6_addr) * count); loop = name; for (i = 0; i < count /*NB: count can grow*/; ++i) { while (isspace(*loop)) ++loop; next = strchr(loop, ','); if (next != NULL) len = next - loop; else len = strlen(loop); if (len > sizeof(buf) - 1) xt_params->exit_err(PARAMETER_PROBLEM, "Hostname too long"); strncpy(buf, loop, len); buf[len] = '\0'; if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_ip6mask(p + 1); } else { addrp = parse_ip6mask(NULL); } memcpy(*maskpp + i, addrp, sizeof(*addrp)); /* if a null mask is given, the name is ignored, like in "any/0" */ if (memcmp(*maskpp + i, &zero_addr, sizeof(zero_addr)) == 0) strcpy(buf, "::"); addrp = ip6parse_hostnetwork(buf, &n); if (n > 1) { count += n - 1; *addrpp = xtables_realloc(*addrpp, sizeof(struct in6_addr) * count); *maskpp = xtables_realloc(*maskpp, sizeof(struct in6_addr) * count); for (j = 0; j < n; ++j) /* for each new addr */ memcpy(*addrpp + i + j, addrp + j, sizeof(*addrp)); for (j = 1; j < n; ++j) /* for each new mask */ memcpy(*maskpp + i + j, *maskpp + i, sizeof(*addrp)); i += n - 1; } else { memcpy(*addrpp + i, addrp, sizeof(*addrp)); } /* free what ip6parse_hostnetwork had allocated: */ free(addrp); if (next == NULL) break; loop = next + 1; } *naddrs = count; for (i = 0; i < count; ++i) for (j = 0; j < 4; ++j) (*addrpp+i)->s6_addr32[j] &= (*maskpp+i)->s6_addr32[j]; } void xtables_ip6parse_any(const char *name, struct in6_addr **addrpp, struct in6_addr *maskp, unsigned int *naddrs) { static const struct in6_addr zero_addr; struct in6_addr *addrp; unsigned int i, j, k, n; char buf[256], *p; strncpy(buf, name, sizeof(buf) - 1); buf[sizeof(buf)-1] = '\0'; if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_ip6mask(p + 1); } else { addrp = parse_ip6mask(NULL); } memcpy(maskp, addrp, sizeof(*maskp)); /* if a null mask is given, the name is ignored, like in "any/0" */ if (memcmp(maskp, &zero_addr, sizeof(zero_addr)) == 0) strcpy(buf, "::"); addrp = *addrpp = ip6parse_hostnetwork(buf, naddrs); n = *naddrs; for (i = 0, j = 0; i < n; ++i) { for (k = 0; k < 4; ++k) addrp[j].s6_addr32[k] &= maskp->s6_addr32[k]; ++j; for (k = 0; k < j - 1; ++k) if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { /* * Nuke the dup by copying an address from the * tail here, and check the current position * again (--j). */ memcpy(&addrp[--j], &addrp[--*naddrs], sizeof(struct in_addr)); break; } } } void xtables_save_string(const char *value) { static const char no_quote_chars[] = "_-0123456789" "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; static const char escape_chars[] = "\"\\'"; size_t length; const char *p; length = strspn(value, no_quote_chars); if (length > 0 && value[length] == 0) { /* no quoting required */ putchar(' '); fputs(value, stdout); } else { /* there is at least one dangerous character in the value, which we have to quote. Write double quotes around the value and escape special characters with a backslash */ printf(" \""); for (p = strpbrk(value, escape_chars); p != NULL; p = strpbrk(value, escape_chars)) { if (p > value) fwrite(value, 1, p - value, stdout); putchar('\\'); putchar(*p); value = p + 1; } /* print the rest and finish the double quoted string */ fputs(value, stdout); putchar('\"'); } } const struct xtables_pprot xtables_chain_protos[] = { {"tcp", IPPROTO_TCP}, {"sctp", IPPROTO_SCTP}, {"udp", IPPROTO_UDP}, {"udplite", IPPROTO_UDPLITE}, {"icmp", IPPROTO_ICMP}, {"icmpv6", IPPROTO_ICMPV6}, {"ipv6-icmp", IPPROTO_ICMPV6}, {"esp", IPPROTO_ESP}, {"ah", IPPROTO_AH}, {"ipv6-mh", IPPROTO_MH}, {"mh", IPPROTO_MH}, {"all", 0}, {NULL}, }; uint16_t xtables_parse_protocol(const char *s) { const struct protoent *pent; unsigned int proto, i; if (xtables_strtoui(s, NULL, &proto, 0, UINT8_MAX)) return proto; /* first deal with the special case of 'all' to prevent * people from being able to redefine 'all' in nsswitch * and/or provoke expensive [not working] ldap/nis/... * lookups */ if (strcmp(s, "all") == 0) return 0; pent = getprotobyname(s); if (pent != NULL) return pent->p_proto; for (i = 0; i < ARRAY_SIZE(xtables_chain_protos); ++i) { if (xtables_chain_protos[i].name == NULL) continue; if (strcmp(s, xtables_chain_protos[i].name) == 0) return xtables_chain_protos[i].num; } xt_params->exit_err(PARAMETER_PROBLEM, "unknown protocol \"%s\" specified", s); return -1; } void xtables_print_num(uint64_t number, unsigned int format) { if (!(format & FMT_KILOMEGAGIGA)) { printf(FMT("%8llu ","%llu "), (unsigned long long)number); return; } if (number <= 99999) { printf(FMT("%5llu ","%llu "), (unsigned long long)number); return; } number = (number + 500) / 1000; if (number <= 9999) { printf(FMT("%4lluK ","%lluK "), (unsigned long long)number); return; } number = (number + 500) / 1000; if (number <= 9999) { printf(FMT("%4lluM ","%lluM "), (unsigned long long)number); return; } number = (number + 500) / 1000; if (number <= 9999) { printf(FMT("%4lluG ","%lluG "), (unsigned long long)number); return; } number = (number + 500) / 1000; printf(FMT("%4lluT ","%lluT "), (unsigned long long)number); } void xtables_print_mac(const unsigned char *macaddress) { unsigned int i; printf("%02x", macaddress[0]); for (i = 1; i < 6; ++i) printf(":%02x", macaddress[i]); } void xtables_print_mac_and_mask(const unsigned char *mac, const unsigned char *mask) { static const char hlpmsk[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; xtables_print_mac(mac); if (memcmp(mask, hlpmsk, 6) == 0) return; printf("/"); xtables_print_mac(mask); } void xtables_parse_val_mask(struct xt_option_call *cb, unsigned int *val, unsigned int *mask, const struct xtables_lmap *lmap) { char *end; *mask = ~0U; if (!xtables_strtoui(cb->arg, &end, val, 0, UINT32_MAX)) { if (lmap) goto name2val; else goto bad_val; } if (*end == '\0') return; if (*end != '/') { if (lmap) goto name2val; else goto garbage; } if (!xtables_strtoui(end + 1, &end, mask, 0, UINT32_MAX)) goto bad_val; if (*end == '\0') return; garbage: xt_params->exit_err(PARAMETER_PROBLEM, "%s: trailing garbage after value " "for option \"--%s\".\n", cb->ext_name, cb->entry->name); bad_val: xt_params->exit_err(PARAMETER_PROBLEM, "%s: bad integer value for option \"--%s\", " "or out of range.\n", cb->ext_name, cb->entry->name); name2val: *val = xtables_lmap_name2id(lmap, cb->arg); if ((int)*val == -1) xt_params->exit_err(PARAMETER_PROBLEM, "%s: could not map name %s to an integer value " "for option \"--%s\".\n", cb->ext_name, cb->arg, cb->entry->name); } void xtables_print_val_mask(unsigned int val, unsigned int mask, const struct xtables_lmap *lmap) { if (mask != ~0U) { printf(" 0x%x/0x%x", val, mask); return; } if (lmap) { const char *name = xtables_lmap_id2name(lmap, val); if (name) { printf(" %s", name); return; } } printf(" 0x%x", val); } int kernel_version; void get_kernel_version(void) { static struct utsname uts; int x = 0, y = 0, z = 0; if (uname(&uts) == -1) { fprintf(stderr, "Unable to retrieve kernel version.\n"); xtables_free_opts(1); exit(1); } sscanf(uts.release, "%d.%d.%d", &x, &y, &z); kernel_version = LINUX_VERSION(x, y, z); } #include struct xt_xlate { struct { char *data; int size; int rem; int off; } buf; char comment[NFT_USERDATA_MAXLEN]; }; struct xt_xlate *xt_xlate_alloc(int size) { struct xt_xlate *xl; xl = malloc(sizeof(struct xt_xlate)); if (xl == NULL) xtables_error(RESOURCE_PROBLEM, "OOM"); xl->buf.data = malloc(size); if (xl->buf.data == NULL) xtables_error(RESOURCE_PROBLEM, "OOM"); xl->buf.data[0] = '\0'; xl->buf.size = size; xl->buf.rem = size; xl->buf.off = 0; xl->comment[0] = '\0'; return xl; } void xt_xlate_free(struct xt_xlate *xl) { free(xl->buf.data); free(xl); } void xt_xlate_add(struct xt_xlate *xl, const char *fmt, ...) { va_list ap; int len; va_start(ap, fmt); len = vsnprintf(xl->buf.data + xl->buf.off, xl->buf.rem, fmt, ap); if (len < 0 || len >= xl->buf.rem) xtables_error(RESOURCE_PROBLEM, "OOM"); va_end(ap); xl->buf.rem -= len; xl->buf.off += len; } void xt_xlate_add_comment(struct xt_xlate *xl, const char *comment) { strncpy(xl->comment, comment, NFT_USERDATA_MAXLEN - 1); xl->comment[NFT_USERDATA_MAXLEN - 1] = '\0'; } const char *xt_xlate_get_comment(struct xt_xlate *xl) { return xl->comment[0] ? xl->comment : NULL; } const char *xt_xlate_get(struct xt_xlate *xl) { return xl->buf.data; }