/* * (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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef NO_SHARED_LIBS #include #endif #define NPROTO 255 #ifndef PROC_SYS_MODPROBE #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" #endif char *lib_dir; /* the path to command to load kernel module */ const char *modprobe_program = NULL; /* Keeping track of external matches and targets: linked lists. */ struct xtables_match *xtables_matches; struct xtables_target *xtables_targets; void *fw_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 *fw_malloc(size_t size) { void *p; if ((p = malloc(size)) == NULL) { perror("ip[6]tables: malloc failed"); exit(1); } return p; } static char *get_modprobe(void) { int procfile; char *ret; #define PROCFILE_BUFSIZ 1024 procfile = open(PROC_SYS_MODPROBE, O_RDONLY); if (procfile < 0) return NULL; ret = (char *) malloc(PROCFILE_BUFSIZ); if (ret) { memset(ret, 0, PROCFILE_BUFSIZ); switch (read(procfile, ret, PROCFILE_BUFSIZ)) { case -1: goto fail; case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */ } if (ret[strlen(ret)-1]=='\n') ret[strlen(ret)-1]=0; close(procfile); return ret; } fail: free(ret); close(procfile); return NULL; } int xtables_insmod(const char *modname, const char *modprobe, int quiet) { char *buf = NULL; char *argv[4]; int status; /* If they don't explicitly set it, read out of kernel */ if (!modprobe) { buf = get_modprobe(); if (!buf) return -1; modprobe = buf; } switch (fork()) { case 0: argv[0] = (char *)modprobe; argv[1] = (char *)modname; if (quiet) { argv[2] = "-q"; argv[3] = NULL; } else { argv[2] = NULL; argv[3] = NULL; } execv(argv[0], argv); /* not usually reached */ exit(1); case -1: return -1; default: /* parent */ wait(&status); } free(buf); if (WIFEXITED(status) && WEXITSTATUS(status) == 0) return 0; return -1; } int load_xtables_ko(const char *modprobe, int quiet) { static int loaded = 0; static int ret = -1; if (!loaded) { ret = xtables_insmod(afinfo.kmod, modprobe, quiet); loaded = (ret == 0); } return ret; } 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; } /* * strtonum{,l} - string to number conversion * * If @end is NULL, we assume the caller does not want * a case like "15a", so reject it. */ bool strtonuml(const char *s, char **end, unsigned long *value, unsigned long min, unsigned long max) { unsigned long v; char *my_end; errno = 0; v = strtoul(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 strtonum(const char *s, char **end, unsigned int *value, unsigned int min, unsigned int max) { unsigned long v; bool ret; ret = strtonuml(s, end, &v, min, max); if (value != NULL) *value = v; return ret; } int 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; } u_int16_t parse_port(const char *port, const char *proto) { unsigned int portnum; if ((string_to_number(port, 0, 65535, &portnum)) != -1 || (portnum = service_to_port(port, proto)) != (unsigned)-1) return (u_int16_t)portnum; exit_error(PARAMETER_PROBLEM, "invalid port/service `%s' specified", port); } void parse_interface(const char *arg, char *vianame, unsigned char *mask) { int vialen = strlen(arg); unsigned int i; memset(mask, 0, IFNAMSIZ); memset(vianame, 0, IFNAMSIZ); if (vialen + 1 > IFNAMSIZ) exit_error(PARAMETER_PROBLEM, "interface name `%s' must be shorter than IFNAMSIZ" " (%i)", arg, IFNAMSIZ-1); strcpy(vianame, arg); if ((vialen == 0) || (vialen == 1 && vianame[0] == '+')) memset(mask, 0, IFNAMSIZ); else if (vianame[vialen - 1] == '+') { memset(mask, 0xFF, vialen - 1); memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); /* Don't remove `+' here! -HW */ } else { /* Include nul-terminator in match */ memset(mask, 0xFF, vialen + 1); memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1); for (i = 0; vianame[i]; i++) { if (vianame[i] == ':' || vianame[i] == '!' || vianame[i] == '*') { fprintf(stderr, "Warning: weird character in interface" " `%s' (No aliases, :, ! or *).\n", vianame); break; } } } } #ifndef NO_SHARED_LIBS static void *load_extension(const char *search_path, const char *prefix, const char *name, bool is_target) { 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); snprintf(path, sizeof(path), "%.*s/libxt_%s.so", (unsigned int)(next - dir), dir, name); if (dlopen(path, RTLD_NOW) != NULL) { /* Found library. If it didn't register itself, maybe they specified target as match. */ if (is_target) ptr = find_target(name, DONT_LOAD); else ptr = find_match(name, DONT_LOAD, NULL); } else if (stat(path, &sb) == 0) { fprintf(stderr, "%s: %s\n", path, dlerror()); } if (ptr != NULL) return ptr; snprintf(path, sizeof(path), "%.*s/%s%s.so", (unsigned int)(next - dir), dir, prefix, name); if (dlopen(path, RTLD_NOW) != NULL) { if (is_target) ptr = find_target(name, DONT_LOAD); else ptr = find_match(name, DONT_LOAD, NULL); } else if (stat(path, &sb) == 0) { fprintf(stderr, "%s: %s\n", path, dlerror()); } if (ptr != NULL) return ptr; dir = next + 1; } while (*next != '\0'); return NULL; } #endif struct xtables_match *find_match(const char *name, enum xt_tryload tryload, struct xtables_rule_match **matches) { struct xtables_match *ptr; const char *icmp6 = "icmp6"; /* 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; for (ptr = xtables_matches; ptr; ptr = ptr->next) { if (strcmp(name, ptr->name) == 0) { struct xtables_match *clone; /* First match of this type: */ if (ptr->m == NULL) break; /* Second and subsequent clones */ clone = fw_malloc(sizeof(struct xtables_match)); memcpy(clone, ptr, sizeof(struct xtables_match)); clone->mflags = 0; /* This is a clone: */ clone->next = clone; ptr = clone; break; } } #ifndef NO_SHARED_LIBS if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { ptr = load_extension(lib_dir, afinfo.libprefix, name, false); if (ptr == NULL && tryload == LOAD_MUST_SUCCEED) exit_error(PARAMETER_PROBLEM, "Couldn't load match `%s':%s\n", name, dlerror()); } #else if (ptr && !ptr->loaded) { if (tryload != DONT_LOAD) ptr->loaded = 1; else ptr = NULL; } if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { exit_error(PARAMETER_PROBLEM, "Couldn't find match `%s'\n", name); } #endif if (ptr && matches) { struct xtables_rule_match **i; struct xtables_rule_match *newentry; newentry = fw_malloc(sizeof(struct xtables_rule_match)); for (i = matches; *i; i = &(*i)->next) { if (strcmp(name, (*i)->match->name) == 0) (*i)->completed = 1; } newentry->match = ptr; newentry->completed = 0; newentry->next = NULL; *i = newentry; } return ptr; } struct xtables_target *find_target(const char *name, enum xt_tryload tryload) { 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"; for (ptr = xtables_targets; ptr; ptr = ptr->next) { if (strcmp(name, ptr->name) == 0) break; } #ifndef NO_SHARED_LIBS if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { ptr = load_extension(lib_dir, afinfo.libprefix, name, true); if (ptr == NULL && tryload == LOAD_MUST_SUCCEED) exit_error(PARAMETER_PROBLEM, "Couldn't load target `%s':%s\n", name, dlerror()); } #else if (ptr && !ptr->loaded) { if (tryload != DONT_LOAD) ptr->loaded = 1; else ptr = NULL; } if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { exit_error(PARAMETER_PROBLEM, "Couldn't find target `%s'\n", name); } #endif if (ptr) ptr->used = 1; return ptr; } static int compatible_revision(const char *name, u_int8_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, "Could not determine whether " "revision %u is supported, " "assuming it is.\n", revision); return 1; } fprintf(stderr, "Could not open socket to kernel: %s\n", strerror(errno)); exit(1); } load_xtables_ko(modprobe_program, 1); 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, u_int8_t revision) { return compatible_revision(name, revision, afinfo.so_rev_match); } static int compatible_target_revision(const char *name, u_int8_t revision) { return compatible_revision(name, revision, afinfo.so_rev_target); } void xtables_register_match(struct xtables_match *me) { struct xtables_match **i, *old; if (strcmp(me->version, program_version) != 0) { fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n", program_name, me->name, me->version, program_version); exit(1); } /* Revision field stole a char from name. */ if (strlen(me->name) >= XT_FUNCTION_MAXNAMELEN-1) { fprintf(stderr, "%s: target `%s' has invalid name\n", program_name, me->name); exit(1); } if (me->family >= NPROTO) { fprintf(stderr, "%s: BUG: match %s has invalid protocol family\n", program_name, me->name); exit(1); } /* ignore not interested match */ if (me->family != afinfo.family && me->family != AF_UNSPEC) return; old = find_match(me->name, DURING_LOAD, NULL); if (old) { if (old->revision == me->revision && old->family == me->family) { fprintf(stderr, "%s: match `%s' already registered.\n", program_name, me->name); exit(1); } /* Now we have two (or more) options, check compatibility. */ if (compatible_match_revision(old->name, old->revision) && old->revision > me->revision) return; /* See if new match can be used. */ if (!compatible_match_revision(me->name, me->revision)) return; /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ if (old->revision == me->revision && me->family == AF_UNSPEC) return; /* Delete old one. */ for (i = &xtables_matches; *i!=old; i = &(*i)->next); *i = old->next; } if (me->size != XT_ALIGN(me->size)) { fprintf(stderr, "%s: match `%s' has invalid size %u.\n", program_name, me->name, (unsigned int)me->size); exit(1); } /* Append to list. */ for (i = &xtables_matches; *i; i = &(*i)->next); me->next = NULL; *i = me; me->m = NULL; me->mflags = 0; } void xtables_register_target(struct xtables_target *me) { struct xtables_target *old; if (strcmp(me->version, program_version) != 0) { fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n", program_name, me->name, me->version, program_version); exit(1); } /* Revision field stole a char from name. */ if (strlen(me->name) >= XT_FUNCTION_MAXNAMELEN-1) { fprintf(stderr, "%s: target `%s' has invalid name\n", program_name, me->name); exit(1); } if (me->family >= NPROTO) { fprintf(stderr, "%s: BUG: target %s has invalid protocol family\n", program_name, me->name); exit(1); } /* ignore not interested target */ if (me->family != afinfo.family && me->family != AF_UNSPEC) return; old = find_target(me->name, DURING_LOAD); if (old) { struct xtables_target **i; if (old->revision == me->revision && old->family == me->family) { fprintf(stderr, "%s: target `%s' already registered.\n", program_name, me->name); exit(1); } /* Now we have two (or more) options, check compatibility. */ if (compatible_target_revision(old->name, old->revision) && old->revision > me->revision) return; /* See if new target can be used. */ if (!compatible_target_revision(me->name, me->revision)) return; /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ if (old->revision == me->revision && me->family == AF_UNSPEC) return; /* Delete old one. */ for (i = &xtables_targets; *i!=old; i = &(*i)->next); *i = old->next; } if (me->size != XT_ALIGN(me->size)) { fprintf(stderr, "%s: target `%s' has invalid size %u.\n", program_name, me->name, (unsigned int)me->size); exit(1); } /* Prepend to list. */ me->next = xtables_targets; xtables_targets = me; me->t = NULL; me->tflags = 0; } void param_act(unsigned int status, const char *p1, ...) { const char *p2, *p3; va_list args; bool b; va_start(args, p1); switch (status) { case P_ONLY_ONCE: p2 = va_arg(args, const char *); b = va_arg(args, unsigned int); if (!b) return; exit_error(PARAMETER_PROBLEM, "%s: \"%s\" option may only be specified once", p1, p2); break; case P_NO_INVERT: p2 = va_arg(args, const char *); b = va_arg(args, unsigned int); if (!b) return; exit_error(PARAMETER_PROBLEM, "%s: \"%s\" option cannot be inverted", p1, p2); break; case P_BAD_VALUE: p2 = va_arg(args, const char *); p3 = va_arg(args, const char *); exit_error(PARAMETER_PROBLEM, "%s: Bad value for \"%s\" option: \"%s\"", p1, p2, p3); break; case P_ONE_ACTION: b = va_arg(args, unsigned int); if (!b) return; exit_error(PARAMETER_PROBLEM, "%s: At most one action is possible", p1); break; default: exit_error(status, p1, args); break; } va_end(args); } const char *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) { struct hostent *host; host = gethostbyaddr(addr, sizeof(struct in_addr), AF_INET); if (host == NULL) return NULL; return host->h_name; } 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 *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 ipaddr_to_numeric(addr); } const char *ipmask_to_numeric(const struct in_addr *mask) { static char buf[20]; uint32_t maskaddr, bits; int i; maskaddr = ntohl(mask->s_addr); if (maskaddr == 0xFFFFFFFFL) /* we don't want to see "/32" */ return ""; i = 32; bits = 0xFFFFFFFEL; while (--i >= 0 && maskaddr != bits) bits <<= 1; if (i >= 0) sprintf(buf, "/%d", i); else /* mask was not a decent combination of 1's and 0's */ sprintf(buf, "/%s", ipaddr_to_numeric(mask)); 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 (!strtonum(p, NULL, &onebyte, 0, 255)) return NULL; addrp[i] = onebyte; while (i < 3) addrp[++i] = 0; return &addr; } *q = '\0'; if (!strtonum(p, NULL, &onebyte, 0, 255)) return NULL; addrp[i] = onebyte; p = q + 1; } /* we have checked 3 bytes, now we check the last one */ if (!strtonum(p, NULL, &onebyte, 0, 255)) return NULL; addrp[3] = onebyte; return &addr; } struct in_addr *numeric_to_ipaddr(const char *dotted) { return __numeric_to_ipaddr(dotted, false); } struct in_addr *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 hostent *host; struct in_addr *addr; unsigned int i; *naddr = 0; if ((host = gethostbyname(name)) != NULL) { if (host->h_addrtype != AF_INET || host->h_length != sizeof(struct in_addr)) return NULL; while (host->h_addr_list[*naddr] != NULL) ++*naddr; addr = fw_calloc(*naddr, sizeof(struct in_addr) * *naddr); for (i = 0; i < *naddr; i++) memcpy(&addr[i], host->h_addr_list[i], sizeof(struct in_addr)); return addr; } return NULL; } static struct in_addr * ipparse_hostnetwork(const char *name, unsigned int *naddrs) { struct in_addr *addrptmp, *addrp; if ((addrptmp = numeric_to_ipaddr(name)) != NULL || (addrptmp = network_to_ipaddr(name)) != NULL) { addrp = fw_malloc(sizeof(struct in_addr)); memcpy(addrp, addrptmp, sizeof(*addrp)); *naddrs = 1; return addrp; } if ((addrptmp = host_to_ipaddr(name, naddrs)) != NULL) return addrptmp; exit_error(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 = numeric_to_ipmask(mask)) != NULL) /* dotted_to_addr already returns a network byte order addr */ return addrp; if (string_to_number(mask, 0, 32, &bits) == -1) exit_error(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 ipparse_hostnetworkmask(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) { --*naddrs; --j; break; } } } const char *ip6addr_to_numeric(const struct in6_addr *addrp) { /* 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) { #ifdef DEBUG fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); #endif return NULL; } #ifdef DEBUG fprintf (stderr, "\naddr2host: %s\n", hostname); #endif return hostname; } const char *ip6addr_to_anyname(const struct in6_addr *addr) { const char *name; if ((name = ip6addr_to_host(addr)) != NULL) return name; return ip6addr_to_numeric(addr); } static int ip6addr_prefix_length(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 *ip6mask_to_numeric(const struct in6_addr *addrp) { static char buf[50+2]; int l = ip6addr_prefix_length(addrp); if (l == -1) { strcpy(buf, "/"); strcat(buf, ip6addr_to_numeric(addrp)); return buf; } sprintf(buf, "/%d", l); return buf; } struct in6_addr *numeric_to_ip6addr(const char *num) { static struct in6_addr ap; int err; if ((err = inet_pton(AF_INET6, num, &ap)) == 1) return ≈ #ifdef DEBUG fprintf(stderr, "\nnumeric2addr: %d\n", err); #endif return NULL; } static struct in6_addr * host_to_ip6addr(const char *name, unsigned int *naddr) { static struct in6_addr *addr; struct addrinfo hints; struct addrinfo *res; int err; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; hints.ai_family = AF_INET6; hints.ai_socktype = SOCK_RAW; hints.ai_protocol = IPPROTO_IPV6; hints.ai_next = NULL; *naddr = 0; if ((err = getaddrinfo(name, NULL, &hints, &res)) != 0) { #ifdef DEBUG fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); #endif return NULL; } else { if (res->ai_family != AF_INET6 || res->ai_addrlen != sizeof(struct sockaddr_in6)) return NULL; #ifdef DEBUG fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, ip6addr_to_numeric(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)); #endif /* Get the first element of the address-chain */ addr = fw_malloc(sizeof(struct in6_addr)); memcpy(addr, &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr, sizeof(struct in6_addr)); freeaddrinfo(res); *naddr = 1; return addr; } return NULL; } 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 = numeric_to_ip6addr(name)) != NULL || (addrptmp = network_to_ip6addr(name)) != NULL) { addrp = fw_malloc(sizeof(struct in6_addr)); memcpy(addrp, addrptmp, sizeof(*addrp)); *naddrs = 1; return addrp; } if ((addrp = host_to_ip6addr(name, naddrs)) != NULL) return addrp; exit_error(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 = numeric_to_ip6addr(mask)) != NULL) return addrp; if (string_to_number(mask, 0, 128, &bits) == -1) exit_error(PARAMETER_PROBLEM, "invalid mask `%s' specified", mask); if (bits != 0) { char *p = (void *)&maskaddr; memset(p, 0xff, bits / 8); memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); p[bits/8] = 0xff << (8 - (bits & 7)); return &maskaddr; } memset(&maskaddr, 0, sizeof(maskaddr)); return &maskaddr; } void ip6parse_hostnetworkmask(const char *name, struct in6_addr **addrpp, struct in6_addr *maskp, unsigned int *naddrs) { 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, &in6addr_any, sizeof(in6addr_any)) == 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])) { --*naddrs; --j; break; } } } void 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 = strcspn(value, no_quote_chars); if (length > 0 && value[length] == 0) { /* no quoting required */ fputs(value, stdout); putchar(' '); } 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 */ putchar('"'); 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); printf("\" "); } }