/* Code to take an iptables-style command line and do it. */ /* * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au * * 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 #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 #define FMT_NUMERIC 0x0001 #define FMT_NOCOUNTS 0x0002 #define FMT_KILOMEGAGIGA 0x0004 #define FMT_OPTIONS 0x0008 #define FMT_NOTABLE 0x0010 #define FMT_NOTARGET 0x0020 #define FMT_VIA 0x0040 #define FMT_NONEWLINE 0x0080 #define FMT_LINENUMBERS 0x0100 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \ | FMT_NUMERIC | FMT_NOTABLE) #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab)) #define CMD_NONE 0x0000U #define CMD_INSERT 0x0001U #define CMD_DELETE 0x0002U #define CMD_DELETE_NUM 0x0004U #define CMD_REPLACE 0x0008U #define CMD_APPEND 0x0010U #define CMD_LIST 0x0020U #define CMD_FLUSH 0x0040U #define CMD_ZERO 0x0080U #define CMD_NEW_CHAIN 0x0100U #define CMD_DELETE_CHAIN 0x0200U #define CMD_SET_POLICY 0x0400U #define CMD_CHECK 0x0800U #define CMD_RENAME_CHAIN 0x1000U #define NUMBER_OF_CMD 13 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 'N', 'X', 'P', 'C', 'E' }; #define OPTION_OFFSET 256 #define OPT_NONE 0x00000U #define OPT_NUMERIC 0x00001U #define OPT_SOURCE 0x00002U #define OPT_DESTINATION 0x00004U #define OPT_PROTOCOL 0x00008U #define OPT_JUMP 0x00010U #define OPT_VERBOSE 0x00020U #define OPT_EXPANDED 0x00040U #define OPT_VIANAMEIN 0x00080U #define OPT_VIANAMEOUT 0x00100U #define OPT_FRAGMENT 0x00200U #define OPT_LINENUMBERS 0x00400U #define NUMBER_OF_OPT 11 static const char optflags[NUMBER_OF_OPT] = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '3'}; static struct option original_opts[] = { { "append", 1, 0, 'A' }, { "delete", 1, 0, 'D' }, { "insert", 1, 0, 'I' }, { "replace", 1, 0, 'R' }, { "list", 2, 0, 'L' }, { "flush", 2, 0, 'F' }, { "zero", 2, 0, 'Z' }, { "check", 1, 0, 'C' }, { "new-chain", 1, 0, 'N' }, { "delete-chain", 2, 0, 'X' }, { "rename-chain", 2, 0, 'E' }, { "policy", 1, 0, 'P' }, { "source", 1, 0, 's' }, { "destination", 1, 0, 'd' }, { "src", 1, 0, 's' }, /* synonym */ { "dst", 1, 0, 'd' }, /* synonym */ { "protocol", 1, 0, 'p' }, { "in-interface", 1, 0, 'i' }, { "jump", 1, 0, 'j' }, { "table", 1, 0, 't' }, { "match", 1, 0, 'm' }, { "numeric", 0, 0, 'n' }, { "out-interface", 1, 0, 'o' }, { "verbose", 0, 0, 'v' }, { "exact", 0, 0, 'x' }, { "fragments", 0, 0, 'f' }, { "version", 0, 0, 'V' }, { "help", 2, 0, 'h' }, { "line-numbers", 0, 0, '0' }, { 0 } }; #if 0 static struct ipt_entry_target * ipt_get_target(struct ipt_entry *e) { return (void *)e + e->target_offset; } #endif static struct option *opts = original_opts; static unsigned int global_option_offset = 0; /* Table of legal combinations of commands and options. If any of the * given commands make an option legal, that option is legal (applies to * CMD_LIST and CMD_ZERO only). * Key: * + compulsory * x illegal * optional */ static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = /* Well, it's better than "Re: Linux vs FreeBSD" */ { /* -n -s -d -p -j -v -x -i -o -f --line */ /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'}, /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'}, /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'}, /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'}, /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'}, /*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' '}, /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'}, /*CHECK*/ {'x','+','+','+','x',' ','x','+','+',' ','x'}, /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'} }; static int inverse_for_options[NUMBER_OF_OPT] = { /* -n */ 0, /* -s */ IPT_INV_SRCIP, /* -d */ IPT_INV_DSTIP, /* -p */ IPT_INV_PROTO, /* -j */ 0, /* -v */ 0, /* -x */ 0, /* -i */ IPT_INV_VIA_IN, /* -o */ IPT_INV_VIA_OUT, /* -f */ IPT_INV_FRAG, /*--line*/ 0 }; const char *program_version; const char *program_name; /* Keeping track of external matches and targets: linked lists. */ struct iptables_match *iptables_matches = NULL; struct iptables_target *iptables_targets = NULL; /* Extra debugging from libiptc */ extern void dump_entries(const iptc_handle_t handle); /* A few hardcoded protocols for 'all' and in case the user has no /etc/protocols */ struct pprot { char *name; u_int8_t num; }; static const struct pprot chain_protos[] = { { "tcp", IPPROTO_TCP }, { "udp", IPPROTO_UDP }, { "icmp", IPPROTO_ICMP }, { "all", 0 }, }; static char * proto_to_name(u_int8_t proto, int nolookup) { unsigned int i; if (proto && !nolookup) { struct protoent *pent = getprotobynumber(proto); if (pent) return pent->p_name; } for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) if (chain_protos[i].num == proto) return chain_protos[i].name; return NULL; } struct in_addr * dotted_to_addr(const char *dotted) { static struct in_addr addr; unsigned char *addrp; char *p, *q; int onebyte, 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 ((onebyte = string_to_number(p, 0, 255)) == -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 ((onebyte = string_to_number(p, 0, 255)) == -1) return (struct in_addr *) NULL; addrp[3] = (unsigned char) onebyte; return &addr; } static struct in_addr * network_to_addr(const char *name) { struct netent *net; static struct in_addr addr; if ((net = getnetbyname(name)) != NULL) { if (net->n_addrtype != AF_INET) return (struct in_addr *) NULL; addr.s_addr = htonl((unsigned long) net->n_net); return &addr; } return (struct in_addr *) NULL; } static void inaddrcpy(struct in_addr *dst, struct in_addr *src) { /* memcpy(dst, src, sizeof(struct in_addr)); */ dst->s_addr = src->s_addr; } void exit_error(enum exittype status, char *msg, ...) { va_list args; va_start(args, msg); fprintf(stderr, "%s v%s: ", program_name, program_version); 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); } void exit_tryhelp(int status) { fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", program_name, program_name ); exit(status); } void exit_printhelp(void) { struct iptables_match *m = NULL; struct iptables_target *t = NULL; printf("%s v%s\n\n" "Usage: %s -[ADC] chain rule-specification [options]\n" " %s -[RI] chain rulenum rule-specification [options]\n" " %s -D chain rulenum [options]\n" " %s -[LFZ] [chain] [options]\n" " %s -[NX] chain\n" " %s -E old-chain-name new-chain-name\n" " %s -P chain target [options]\n" " %s -h (print this help information)\n\n", program_name, program_version, program_name, program_name, program_name, program_name, program_name, program_name, program_name, program_name); printf( "Commands:\n" "Either long or short options are allowed.\n" " --append -A chain Append to chain\n" " --delete -D chain Delete matching rule from chain\n" " --delete -D chain rulenum\n" " Delete rule rulenum (1 = first) from chain\n" " --insert -I chain [rulenum]\n" " Insert in chain as rulenum (default 1=first)\n" " --replace -R chain rulenum\n" " Replace rule rulenum (1 = first) in chain\n" " --list -L [chain] List the rules in a chain or all chains\n" " --flush -F [chain] Delete all rules in chain or all chains\n" " --zero -Z [chain] Zero counters in chain or all chains\n" " --check -C chain Test this packet on chain\n" " --new -N chain Create a new user-defined chain\n" " --delete-chain\n" " -X [chain] Delete a user-defined chain\n" " --policy -P chain target\n" " Change policy on chain to target\n" " --rename-chain\n" " -E old-chain new-chain\n" " Change chain name, (moving any references)\n" "Options:\n" " --proto -p [!] proto protocol: by number or name, eg. `tcp'\n" " --source -s [!] address[/mask]\n" " source specification\n" " --destination -d [!] address[/mask]\n" " destination specification\n" " --in-interface -i [!] input name[+]\n" " network interface name ([+] for wildcard)\n" " --jump -j target\n" " target for rule\n" " --numeric -n numeric output of addresses and ports\n" " --out-interface -o [!] output name[+]\n" " network interface name ([+] for wildcard)\n" " --table -t table table to manipulate (default: `filter')\n" " --verbose -v verbose mode\n" " --exact -x expand numbers (display exact values)\n" "[!] --fragment -f match second or further fragments only\n" "[!] --version -V print package version.\n"); /* Print out any special helps. A user might like to be able to add a --help to the commandline, and see expected results. So we call help for all matches & targets */ for (t=iptables_targets;t;t=t->next) { printf("\n"); t->help(); } for (m=iptables_matches;m;m=m->next) { printf("\n"); m->help(); } exit(0); } static void generic_opt_check(int command, int options) { int i, j, legal = 0; /* Check that commands are valid with options. Complicated by the * fact that if an option is legal with *any* command given, it is * legal overall (ie. -z and -l). */ for (i = 0; i < NUMBER_OF_OPT; i++) { legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ for (j = 0; j < NUMBER_OF_CMD; j++) { if (!(command & (1< 1; option >>= 1, ptr++); return *ptr; } static char cmd2char(int option) { const char *ptr; for (ptr = cmdflags; option > 1; option >>= 1, ptr++); return *ptr; } static void add_command(int *cmd, const int newcmd, const int othercmds, int invert) { if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag"); if (*cmd & (~othercmds)) exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n", cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); *cmd |= newcmd; } int check_inverse(const char option[], int *invert) { if (option && strcmp(option, "!") == 0) { if (*invert) exit_error(PARAMETER_PROBLEM, "Multiple `!' flags not allowed"); *invert = TRUE; return TRUE; } return FALSE; } static void * fw_calloc(size_t count, size_t size) { void *p; if ((p = calloc(count, size)) == NULL) { perror("iptables: calloc failed"); exit(1); } return p; } static void * fw_malloc(size_t size) { void *p; if ((p = malloc(size)) == NULL) { perror("iptables: malloc failed"); exit(1); } return p; } static struct in_addr * host_to_addr(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 (struct in_addr *) NULL; while (host->h_addr_list[*naddr] != (char *) NULL) (*naddr)++; addr = fw_calloc(*naddr, sizeof(struct in_addr)); for (i = 0; i < *naddr; i++) inaddrcpy(&(addr[i]), (struct in_addr *) host->h_addr_list[i]); return addr; } return (struct in_addr *) NULL; } static char * addr_to_host(const struct in_addr *addr) { struct hostent *host; if ((host = gethostbyaddr((char *) addr, sizeof(struct in_addr), AF_INET)) != NULL) return (char *) host->h_name; return (char *) NULL; } /* * All functions starting with "parse" should succeed, otherwise * the program fails. * Most routines return pointers to static data that may change * between calls to the same or other routines with a few exceptions: * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" * return global static data. */ static struct in_addr * parse_hostnetwork(const char *name, unsigned int *naddrs) { struct in_addr *addrp, *addrptmp; if ((addrptmp = dotted_to_addr(name)) != NULL || (addrptmp = network_to_addr(name)) != NULL) { addrp = fw_malloc(sizeof(struct in_addr)); inaddrcpy(addrp, addrptmp); *naddrs = 1; return addrp; } if ((addrp = host_to_addr(name, naddrs)) != NULL) return addrp; exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); } static struct in_addr * parse_mask(char *mask) { static struct in_addr maskaddr; struct in_addr *addrp; int bits; if (mask == NULL) { /* no mask at all defaults to 32 bits */ maskaddr.s_addr = 0xFFFFFFFF; return &maskaddr; } if ((addrp = dotted_to_addr(mask)) != NULL) /* dotted_to_addr already returns a network byte order addr */ return addrp; if ((bits = string_to_number(mask, 0, 32)) == -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 = 0L; return &maskaddr; } static void parse_hostnetworkmask(const char *name, struct in_addr **addrpp, struct in_addr *maskp, unsigned int *naddrs) { struct in_addr *addrp; char buf[256]; char *p; int i, j, k, n; strncpy(buf, name, sizeof(buf) - 1); if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_mask(p + 1); } else addrp = parse_mask(NULL); inaddrcpy(maskp, addrp); /* if a null mask is given, the name is ignored, like in "any/0" */ if (maskp->s_addr == 0L) strcpy(buf, "0.0.0.0"); addrp = *addrpp = parse_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; } } } } struct iptables_match * find_match(const char *name, enum ipt_tryload tryload) { struct iptables_match *ptr; for (ptr = iptables_matches; ptr; ptr = ptr->next) { if (strcmp(name, ptr->name) == 0) break; } if (!ptr && tryload != DONT_LOAD) { char path[sizeof(IPT_LIB_DIR) + sizeof("/libipt_.so") + strlen(name)]; sprintf(path, IPT_LIB_DIR "/libipt_%s.so", name); if (dlopen(path, RTLD_NOW)) { /* Found library. If it didn't register itself, maybe they specified target as match. */ ptr = find_match(name, DONT_LOAD); if (!ptr) exit_error(PARAMETER_PROBLEM, "Couldn't load match `%s'\n", name); } else if (tryload == LOAD_MUST_SUCCEED) exit_error(PARAMETER_PROBLEM, "Couldn't load match `%s'\n", name); } return ptr; } /* Christophe Burki wants `-p 6' to imply `-m tcp'. */ static struct iptables_match * find_proto(const char *pname, enum ipt_tryload tryload, int nolookup) { int proto; proto = string_to_number(pname, 0, 255); if (proto != -1) return find_match(proto_to_name(proto, nolookup), tryload); return find_match(pname, tryload); } static u_int16_t parse_protocol(const char *s) { int proto = string_to_number(s, 0, 255); if (proto == -1) { struct protoent *pent; if ((pent = getprotobyname(s))) proto = pent->p_proto; else { unsigned int i; for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) { if (strcmp(s, chain_protos[i].name) == 0) { proto = chain_protos[i].num; break; } } if (i == sizeof(chain_protos)/sizeof(struct pprot)) exit_error(PARAMETER_PROBLEM, "unknown protocol `%s' specified", s); } } return (u_int16_t)proto; } static 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) memset(mask, 0, IFNAMSIZ); else if (vianame[vialen - 1] == '+') { memset(mask, 0xFF, vialen - 1); memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); /* Remove `+' */ vianame[vialen - 1] = '\0'; } 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 (!isalnum(vianame[i])) { printf("Warning: wierd character in interface" " `%s' (No aliases, :, ! or *).\n", vianame); break; } } } /* Can't be zero. */ static int parse_rulenumber(const char *rule) { int rulenum = string_to_number(rule, 1, INT_MAX); if (rulenum == -1) exit_error(PARAMETER_PROBLEM, "Invalid rule number `%s'", rule); return rulenum; } static const char * parse_target(const char *targetname) { const char *ptr; if (strlen(targetname) < 1) exit_error(PARAMETER_PROBLEM, "Invalid target name (too short)"); if (strlen(targetname)+1 > sizeof(ipt_chainlabel)) exit_error(PARAMETER_PROBLEM, "Invalid target name `%s' (%i chars max)", targetname, sizeof(ipt_chainlabel)-1); for (ptr = targetname; *ptr; ptr++) if (isspace(*ptr)) exit_error(PARAMETER_PROBLEM, "Invalid target name `%s'", targetname); return targetname; } static char * addr_to_network(const struct in_addr *addr) { struct netent *net; if ((net = getnetbyaddr((long) ntohl(addr->s_addr), AF_INET)) != NULL) return (char *) net->n_name; return (char *) NULL; } 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; } static char * addr_to_anyname(const struct in_addr *addr) { char *name; if ((name = addr_to_host(addr)) != NULL || (name = addr_to_network(addr)) != NULL) return name; return addr_to_dotted(addr); } static char * mask_to_dotted(const struct in_addr *mask) { int i; static char buf[20]; u_int32_t maskaddr, bits; 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", addr_to_dotted(mask)); return buf; } int string_to_number(const char *s, int min, int max) { int number; char *end; /* Handle hex, octal, etc. */ number = (int)strtol(s, &end, 0); if (*end == '\0' && end != s) { /* we parsed a number, let's see if we want this */ if (min <= number && number <= max) return number; } return -1; } static void set_option(unsigned int *options, unsigned int option, u_int8_t *invflg, int invert) { if (*options & option) exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", opt2char(option)); *options |= option; if (invert) { unsigned int i; for (i = 0; 1 << i != option; i++); if (!inverse_for_options[i]) exit_error(PARAMETER_PROBLEM, "cannot have ! before -%c", opt2char(option)); *invflg |= inverse_for_options[i]; } } struct iptables_target * find_target(const char *name, enum ipt_tryload tryload) { struct iptables_target *ptr; /* Standard target? */ if (strcmp(name, "") == 0 || strcmp(name, IPTC_LABEL_ACCEPT) == 0 || strcmp(name, IPTC_LABEL_DROP) == 0 || strcmp(name, IPTC_LABEL_QUEUE) == 0 || strcmp(name, IPTC_LABEL_RETURN) == 0) name = "standard"; for (ptr = iptables_targets; ptr; ptr = ptr->next) { if (strcmp(name, ptr->name) == 0) break; } if (!ptr && tryload != DONT_LOAD) { char path[sizeof(IPT_LIB_DIR) + sizeof("/libipt_.so") + strlen(name)]; sprintf(path, IPT_LIB_DIR "/libipt_%s.so", name); if (dlopen(path, RTLD_NOW)) { /* Found library. If it didn't register itself, maybe they specified match as a target. */ ptr = find_target(name, DONT_LOAD); if (!ptr) exit_error(PARAMETER_PROBLEM, "Couldn't load target `%s'\n", name); } else if (tryload == LOAD_MUST_SUCCEED) exit_error(PARAMETER_PROBLEM, "Couldn't load target `%s'\n", name); } return ptr; } static struct option * merge_options(struct option *oldopts, struct option *newopts, unsigned int *option_offset) { unsigned int num_old, num_new, i; struct option *merge; for (num_old = 0; oldopts[num_old].name; num_old++); for (num_new = 0; newopts[num_new].name; num_new++); global_option_offset += OPTION_OFFSET; *option_offset = global_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; } void register_match(struct iptables_match *me) { 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); } if (find_match(me->name, DONT_LOAD)) { fprintf(stderr, "%s: match `%s' already registered.\n", program_name, me->name); exit(1); } /* Prepend to list. */ me->next = iptables_matches; iptables_matches = me; me->m = NULL; me->mflags = 0; opts = merge_options(opts, me->extra_opts, &me->option_offset); } void register_target(struct iptables_target *me) { 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); } if (find_target(me->name, DONT_LOAD)) { fprintf(stderr, "%s: target `%s' already registered.\n", program_name, me->name); exit(1); } /* Prepend to list. */ me->next = iptables_targets; iptables_targets = me; me->t = NULL; me->tflags = 0; opts = merge_options(opts, me->extra_opts, &me->option_offset); } static void print_header(unsigned int format, const char *chain, iptc_handle_t *handle) { struct ipt_counters counters; const char *pol = iptc_get_policy(chain, &counters, handle); printf("Chain %s", chain); if (pol) { printf(" (policy %s", pol); if (!(format & FMT_NOCOUNTS)) printf(" %llu packets, %llu bytes", counters.pcnt, counters.bcnt); printf(")\n"); } else { unsigned int refs; if (!iptc_get_references(&refs, chain, handle)) printf(" (ERROR obtaining refs)\n"); else printf(" (%u references)\n", refs); } if (format & FMT_LINENUMBERS) printf(FMT("%-4s ", "%s "), "num"); if (!(format & FMT_NOCOUNTS)) { if (format & FMT_KILOMEGAGIGA) { printf(FMT("%5s ","%s "), "pkts"); printf(FMT("%5s ","%s "), "bytes"); } else { printf(FMT("%8s ","%s "), "pkts"); printf(FMT("%10s ","%s "), "bytes"); } } if (!(format & FMT_NOTARGET)) printf(FMT("%-9s ","%s "), "target"); fputs(" prot ", stdout); if (format & FMT_OPTIONS) fputs("opt", stdout); if (format & FMT_VIA) { printf(FMT(" %-6s ","%s "), "in"); printf(FMT("%-6s ","%s "), "out"); } printf(FMT(" %-19s ","%s "), "source"); printf(FMT(" %-19s "," %s "), "destination"); printf("\n"); } static void print_num(u_int64_t number, unsigned int format) { if (format & FMT_KILOMEGAGIGA) { if (number > 99999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; printf(FMT("%4lluG ","%lluG "),number); } else printf(FMT("%4lluM ","%lluM "), number); } else printf(FMT("%4lluK ","%lluK "), number); } else printf(FMT("%5llu ","%llu "), number); } else printf(FMT("%8llu ","%llu "), number); } static int print_match(const struct ipt_entry_match *m, const struct ipt_ip *ip, int numeric) { struct iptables_match *match = find_match(m->u.user.name, TRY_LOAD); if (match) { if (match->print) match->print(ip, m, numeric); } else { if (m->u.user.name[0]) printf("UNKNOWN match `%s' ", m->u.user.name); } /* Don't stop iterating. */ return 0; } /* e is called `fw' here for hysterical raisins */ static void print_firewall(const struct ipt_entry *fw, const char *targname, unsigned int num, unsigned int format, const iptc_handle_t handle) { struct iptables_target *target = NULL; const struct ipt_entry_target *t; u_int8_t flags; char buf[BUFSIZ]; /* User creates a chain called "REJECT": this overrides the `REJECT' target module. Keep feeding them rope until the revolution... Bwahahahahah */ if (!iptc_is_chain(targname, handle)) target = find_target(targname, TRY_LOAD); else target = find_target(IPT_STANDARD_TARGET, LOAD_MUST_SUCCEED); t = ipt_get_target((struct ipt_entry *)fw); flags = fw->ip.flags; if (format & FMT_LINENUMBERS) printf(FMT("%-4u ", "%u "), num+1); if (!(format & FMT_NOCOUNTS)) { print_num(fw->counters.pcnt, format); print_num(fw->counters.bcnt, format); } if (!(format & FMT_NOTARGET)) printf(FMT("%-9s ", "%s "), targname); fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout); { char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC); if (pname) printf(FMT("%-5s", "%s "), pname); else printf(FMT("%-5hu", "%hu "), fw->ip.proto); } if (format & FMT_OPTIONS) { if (format & FMT_NOTABLE) fputs("opt ", stdout); fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout); fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout); fputc(' ', stdout); } if (format & FMT_VIA) { char iface[IFNAMSIZ+2]; if (fw->ip.invflags & IPT_INV_VIA_IN) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ip.iniface[0] != '\0') { strcat(iface, fw->ip.iniface); /* If it doesn't compare the nul-term, it's a wildcard. */ if (fw->ip.iniface_mask[strlen(fw->ip.iniface)] == 0) strcat(iface, "+"); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT(" %-6s ","in %s "), iface); if (fw->ip.invflags & IPT_INV_VIA_OUT) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ip.outiface[0] != '\0') { strcat(iface, fw->ip.outiface); /* If it doesn't compare the nul-term, it's a wildcard. */ if (fw->ip.outiface_mask[strlen(fw->ip.outiface)] == 0) strcat(iface, "+"); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT("%-6s ","out %s "), iface); } fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout); if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC)) printf(FMT("%-19s ","%s "), "anywhere"); else { if (format & FMT_NUMERIC) sprintf(buf, "%s", addr_to_dotted(&(fw->ip.src))); else sprintf(buf, "%s", addr_to_anyname(&(fw->ip.src))); strcat(buf, mask_to_dotted(&(fw->ip.smsk))); printf(FMT("%-19s ","%s "), buf); } fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout); if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC)) printf(FMT("%-19s","-> %s"), "anywhere"); else { if (format & FMT_NUMERIC) sprintf(buf, "%s", addr_to_dotted(&(fw->ip.dst))); else sprintf(buf, "%s", addr_to_anyname(&(fw->ip.dst))); strcat(buf, mask_to_dotted(&(fw->ip.dmsk))); printf(FMT("%-19s","-> %s"), buf); } if (format & FMT_NOTABLE) fputs(" ", stdout); IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC); if (target) { if (target->print) /* Print the target information. */ target->print(&fw->ip, t, format & FMT_NUMERIC); } else if (t->u.target_size != sizeof(*t)) printf("[%u bytes of unknown target data] ", t->u.target_size - sizeof(*t)); if (!(format & FMT_NONEWLINE)) fputc('\n', stdout); } static void print_firewall_line(const struct ipt_entry *fw, const iptc_handle_t h) { struct ipt_entry_target *t; t = ipt_get_target((struct ipt_entry *)fw); print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); } static int append_entry(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int nsaddrs, const struct in_addr saddrs[], unsigned int ndaddrs, const struct in_addr daddrs[], int verbose, iptc_handle_t *handle) { unsigned int i, j; int ret = 1; for (i = 0; i < nsaddrs; i++) { fw->ip.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { fw->ip.dst.s_addr = daddrs[j].s_addr; if (verbose) print_firewall_line(fw, *handle); ret &= iptc_append_entry(chain, fw, handle); } } return ret; } static int replace_entry(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int rulenum, const struct in_addr *saddr, const struct in_addr *daddr, int verbose, iptc_handle_t *handle) { fw->ip.src.s_addr = saddr->s_addr; fw->ip.dst.s_addr = daddr->s_addr; if (verbose) print_firewall_line(fw, *handle); return iptc_replace_entry(chain, fw, rulenum, handle); } static int insert_entry(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int rulenum, unsigned int nsaddrs, const struct in_addr saddrs[], unsigned int ndaddrs, const struct in_addr daddrs[], int verbose, iptc_handle_t *handle) { unsigned int i, j; int ret = 1; for (i = 0; i < nsaddrs; i++) { fw->ip.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { fw->ip.dst.s_addr = daddrs[j].s_addr; if (verbose) print_firewall_line(fw, *handle); ret &= iptc_insert_entry(chain, fw, rulenum, handle); } } return ret; } static unsigned char * make_delete_mask(struct ipt_entry *fw) { /* Establish mask for comparison */ unsigned int size; struct iptables_match *m; unsigned char *mask, *mptr; size = sizeof(struct ipt_entry); for (m = iptables_matches; m; m = m->next) size += sizeof(struct ipt_entry_match) + m->size; mask = fw_calloc(1, size + sizeof(struct ipt_entry_target) + iptables_targets->size); memset(mask, 0xFF, sizeof(struct ipt_entry)); mptr = mask + sizeof(struct ipt_entry); for (m = iptables_matches; m; m = m->next) { memset(mptr, 0xFF, sizeof(struct ipt_entry_match) + m->userspacesize); mptr += sizeof(struct ipt_entry_match) + m->size; } memset(mptr, 0xFF, sizeof(struct ipt_entry_target)); mptr += sizeof(struct ipt_entry_target); memset(mptr, 0xFF, iptables_targets->userspacesize); return mask; } static int delete_entry(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int nsaddrs, const struct in_addr saddrs[], unsigned int ndaddrs, const struct in_addr daddrs[], int verbose, iptc_handle_t *handle) { unsigned int i, j; int ret = 1; unsigned char *mask; mask = make_delete_mask(fw); for (i = 0; i < nsaddrs; i++) { fw->ip.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { fw->ip.dst.s_addr = daddrs[j].s_addr; if (verbose) print_firewall_line(fw, *handle); ret &= iptc_delete_entry(chain, fw, mask, handle); } } return ret; } static int check_packet(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int nsaddrs, const struct in_addr saddrs[], unsigned int ndaddrs, const struct in_addr daddrs[], int verbose, iptc_handle_t *handle) { int ret = 1; unsigned int i, j; const char *msg; for (i = 0; i < nsaddrs; i++) { fw->ip.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { fw->ip.dst.s_addr = daddrs[j].s_addr; if (verbose) print_firewall_line(fw, *handle); msg = iptc_check_packet(chain, fw, handle); if (!msg) ret = 0; else printf("%s\n", msg); } } return ret; } static int for_each_chain(int (*fn)(const ipt_chainlabel, int, iptc_handle_t *), int verbose, int builtinstoo, iptc_handle_t *handle) { int ret = 1; const char *chain; char *chains; unsigned int i, chaincount = 0; chain = iptc_first_chain(handle); while (chain) { chaincount++; chain = iptc_next_chain(handle); } chains = fw_malloc(sizeof(ipt_chainlabel) * chaincount); i = 0; chain = iptc_first_chain(handle); while (chain) { strcpy(chains + i*sizeof(ipt_chainlabel), chain); i++; chain = iptc_next_chain(handle); } for (i = 0; i < chaincount; i++) { if (!builtinstoo && iptc_builtin(chains + i*sizeof(ipt_chainlabel), *handle)) continue; ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle); } free(chains); return ret; } static int flush_entries(const ipt_chainlabel chain, int verbose, iptc_handle_t *handle) { if (!chain) return for_each_chain(flush_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Flushing chain `%s'\n", chain); return iptc_flush_entries(chain, handle); } static int zero_entries(const ipt_chainlabel chain, int verbose, iptc_handle_t *handle) { if (!chain) return for_each_chain(zero_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Zeroing chain `%s'\n", chain); return iptc_zero_entries(chain, handle); } static int delete_chain(const ipt_chainlabel chain, int verbose, iptc_handle_t *handle) { if (!chain) return for_each_chain(delete_chain, verbose, 0, handle); if (verbose) fprintf(stdout, "Deleting chain `%s'\n", chain); return iptc_delete_chain(chain, handle); } static int list_entries(const ipt_chainlabel chain, int verbose, int numeric, int expanded, int linenumbers, iptc_handle_t *handle) { int found = 0; unsigned int format; const char *this; format = FMT_OPTIONS; if (!verbose) format |= FMT_NOCOUNTS; else format |= FMT_VIA; if (numeric) format |= FMT_NUMERIC; if (!expanded) format |= FMT_KILOMEGAGIGA; if (linenumbers) format |= FMT_LINENUMBERS; for (this = iptc_first_chain(handle); this; this = iptc_next_chain(handle)) { const struct ipt_entry *i; unsigned int num; if (chain && strcmp(chain, this) != 0) continue; if (found) printf("\n"); print_header(format, this, handle); i = iptc_first_rule(this, handle); num = 0; while (i) { print_firewall(i, iptc_get_target(i, handle), num++, format, *handle); i = iptc_next_rule(i, handle); } found = 1; } errno = ENOENT; return found; } static struct ipt_entry * generate_entry(const struct ipt_entry *fw, struct iptables_match *matches, struct ipt_entry_target *target) { unsigned int size; struct iptables_match *m; struct ipt_entry *e; size = sizeof(struct ipt_entry); for (m = matches; m; m = m->next) size += m->m->u.match_size; e = fw_malloc(size + target->u.target_size); *e = *fw; e->target_offset = size; e->next_offset = size + target->u.target_size; size = 0; for (m = matches; m; m = m->next) { memcpy(e->elems + size, m->m, m->m->u.match_size); size += m->m->u.match_size; } memcpy(e->elems + size, target, target->u.target_size); return e; } int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle) { struct ipt_entry fw, *e = NULL; int invert = 0; unsigned int nsaddrs = 0, ndaddrs = 0; struct in_addr *saddrs = NULL, *daddrs = NULL; int c, verbose = 0; const char *chain = NULL; const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; const char *policy = NULL, *newname = NULL; unsigned int rulenum = 0, options = 0, command = 0; int ret = 1; struct iptables_match *m; struct iptables_target *target = NULL; const char *jumpto = ""; char *protocol = NULL; memset(&fw, 0, sizeof(fw)); /* Suppress error messages: we may add new options if we demand-load a protocol. */ opterr = 0; while ((c = getopt_long(argc, argv, "-A:C:D:R:I:L::F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:x", opts, NULL)) != -1) { switch (c) { /* * Command selection */ case 'A': add_command(&command, CMD_APPEND, CMD_NONE, invert); chain = optarg; break; case 'D': add_command(&command, CMD_DELETE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') { rulenum = parse_rulenumber(argv[optind++]); command = CMD_DELETE_NUM; } break; case 'C': add_command(&command, CMD_CHECK, CMD_NONE, invert); chain = optarg; break; case 'R': add_command(&command, CMD_REPLACE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); else exit_error(PARAMETER_PROBLEM, "-%c requires a rule number", cmd2char(CMD_REPLACE)); break; case 'I': add_command(&command, CMD_INSERT, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); else rulenum = 1; break; case 'L': add_command(&command, CMD_LIST, CMD_ZERO, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'F': add_command(&command, CMD_FLUSH, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'Z': add_command(&command, CMD_ZERO, CMD_LIST, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'N': add_command(&command, CMD_NEW_CHAIN, CMD_NONE, invert); chain = optarg; break; case 'X': add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'E': add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') newname = argv[optind++]; break; case 'P': add_command(&command, CMD_SET_POLICY, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') policy = argv[optind++]; else exit_error(PARAMETER_PROBLEM, "-%c requires a chain and a policy", cmd2char(CMD_SET_POLICY)); break; case 'h': if (!optarg) optarg = argv[optind]; /* iptables -p icmp -h */ if (!iptables_matches && protocol) find_match(protocol, TRY_LOAD); exit_printhelp(); /* * Option selection */ case 'p': if (check_inverse(optarg, &invert)) optind++; set_option(&options, OPT_PROTOCOL, &fw.ip.invflags, invert); /* Canonicalize into lower case */ for (protocol = argv[optind-1]; *protocol; protocol++) *protocol = tolower(*protocol); protocol = argv[optind-1]; fw.ip.proto = parse_protocol(protocol); if (fw.ip.proto == 0 && (fw.ip.invflags & IPT_INV_PROTO)) exit_error(PARAMETER_PROBLEM, "rule would never match protocol"); fw.nfcache |= NFC_IP_PROTO; break; case 's': if (check_inverse(optarg, &invert)) optind++; set_option(&options, OPT_SOURCE, &fw.ip.invflags, invert); shostnetworkmask = argv[optind-1]; fw.nfcache |= NFC_IP_SRC; break; case 'd': if (check_inverse(optarg, &invert)) optind++; set_option(&options, OPT_DESTINATION, &fw.ip.invflags, invert); dhostnetworkmask = argv[optind-1]; fw.nfcache |= NFC_IP_DST; break; case 'j': set_option(&options, OPT_JUMP, &fw.ip.invflags, invert); jumpto = parse_target(optarg); target = find_target(jumpto, TRY_LOAD); if (target) { size_t size; size = IPT_ALIGN(sizeof(struct ipt_entry_target) + target->size); target->t = fw_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); target->init(target->t, &fw.nfcache); } break; case 'i': if (check_inverse(optarg, &invert)) optind++; set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags, invert); parse_interface(argv[optind-1], fw.ip.iniface, fw.ip.iniface_mask); fw.nfcache |= NFC_IP_IF_IN; break; case 'o': if (check_inverse(optarg, &invert)) optind++; set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags, invert); parse_interface(argv[optind-1], fw.ip.outiface, fw.ip.outiface_mask); fw.nfcache |= NFC_IP_IF_OUT; break; case 'f': set_option(&options, OPT_FRAGMENT, &fw.ip.invflags, invert); fw.ip.flags |= IPT_F_FRAG; fw.nfcache |= NFC_IP_FRAG; break; case 'v': if (!verbose) set_option(&options, OPT_VERBOSE, &fw.ip.invflags, invert); verbose++; break; case 'm': { size_t size; if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag before --match"); m = find_match(optarg, LOAD_MUST_SUCCEED); size = IPT_ALIGN(sizeof(struct ipt_entry_match) + m->size); m->m = fw_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, optarg); m->init(m->m, &fw.nfcache); } break; case 'n': set_option(&options, OPT_NUMERIC, &fw.ip.invflags, invert); break; case 't': if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag before --table"); *table = argv[optind-1]; break; case 'x': set_option(&options, OPT_EXPANDED, &fw.ip.invflags, invert); break; case 'V': if (invert) printf("Not %s ;-)\n", program_version); else printf("%s v%s\n", program_name, program_version); exit(0); case '0': set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags, invert); break; case 1: /* non option */ if (optarg[0] == '!' && optarg[1] == '\0') { if (invert) exit_error(PARAMETER_PROBLEM, "multiple consecutive ! not" " allowed"); invert = TRUE; optarg[0] = '\0'; continue; } printf("Bad argument `%s'\n", optarg); exit_tryhelp(2); default: /* FIXME: This scheme doesn't allow two of the same matches --RR */ if (!target || !(target->parse(c - target->option_offset, argv, invert, &target->tflags, &fw, &target->t))) { for (m = iptables_matches; m; m = m->next) { if (m->parse(c - m->option_offset, argv, invert, &m->mflags, &fw, &fw.nfcache, &m->m)) break; } /* If you listen carefully, you can actually hear this code suck. */ if (m == NULL && protocol && !find_proto(protocol, DONT_LOAD, options&OPT_NUMERIC) && (m = find_proto(protocol, TRY_LOAD, options&OPT_NUMERIC))) { /* Try loading protocol */ size_t size; size = IPT_ALIGN(sizeof(struct ipt_entry_match) + m->size); m->m = fw_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, protocol); m->init(m->m, &fw.nfcache); optind--; continue; } if (!m) exit_error(PARAMETER_PROBLEM, "Unknown arg `%s'", argv[optind-1]); } } invert = FALSE; } for (m = iptables_matches; m; m = m->next) m->final_check(m->mflags); if (target) target->final_check(target->tflags); /* Fix me: must put inverse options checking here --MN */ if (optind < argc) exit_error(PARAMETER_PROBLEM, "unknown arguments found on commandline"); if (!command) exit_error(PARAMETER_PROBLEM, "no command specified"); if (invert) exit_error(PARAMETER_PROBLEM, "nothing appropriate following !"); if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) { if (!(options & OPT_DESTINATION)) dhostnetworkmask = "0.0.0.0/0"; if (!(options & OPT_SOURCE)) shostnetworkmask = "0.0.0.0/0"; } if (shostnetworkmask) parse_hostnetworkmask(shostnetworkmask, &saddrs, &(fw.ip.smsk), &nsaddrs); if (dhostnetworkmask) parse_hostnetworkmask(dhostnetworkmask, &daddrs, &(fw.ip.dmsk), &ndaddrs); if ((nsaddrs > 1 || ndaddrs > 1) && (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP))) exit_error(PARAMETER_PROBLEM, "! not allowed with multiple" " source or destination IP addresses"); if (command == CMD_CHECK && fw.ip.invflags != 0) exit_error(PARAMETER_PROBLEM, "! not allowed with -%c", cmd2char(CMD_CHECK)); if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) exit_error(PARAMETER_PROBLEM, "Replacement rule does not " "specify a unique address"); generic_opt_check(command, options); if (chain && strlen(chain) > IPT_FUNCTION_MAXNAMELEN) exit_error(PARAMETER_PROBLEM, "chain name `%s' too long (must be under %i chars)", chain, IPT_FUNCTION_MAXNAMELEN); *handle = iptc_init(*table); if (!*handle) exit_error(VERSION_PROBLEM, "can't initialize iptables table `%s': %s", *table, iptc_strerror(errno)); if (command == CMD_CHECK || command == CMD_APPEND || command == CMD_DELETE || command == CMD_INSERT || command == CMD_REPLACE) { /* -o not valid with incoming packets. */ if (options & OPT_VIANAMEOUT) if (strcmp(chain, "PREROUTING") == 0 || strcmp(chain, "INPUT") == 0) { exit_error(PARAMETER_PROBLEM, "Can't use -%c with %s\n", opt2char(OPT_VIANAMEOUT), chain); } /* -i not valid with outgoing packets */ if (options & OPT_VIANAMEIN) if (strcmp(chain, "POSTROUTING") == 0 || strcmp(chain, "OUTPUT") == 0) { exit_error(PARAMETER_PROBLEM, "Can't use -%c with %s\n", opt2char(OPT_VIANAMEIN), chain); } if (target && iptc_is_chain(jumpto, *handle)) { printf("Warning: using chain %s, not extension\n", jumpto); target = NULL; } /* If they didn't specify a target, or it's a chain name, use standard. */ if (!target && (strlen(jumpto) == 0 || iptc_is_chain(jumpto, *handle))) { size_t size; target = find_target(IPT_STANDARD_TARGET, LOAD_MUST_SUCCEED); size = sizeof(struct ipt_entry_target) + target->size; target->t = fw_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); target->init(target->t, &fw.nfcache); } if (!target) { struct ipt_entry_target unknown_target; /* Don't know it. Must be extension with no options? */ unknown_target.u.target_size = sizeof(unknown_target); strcpy(unknown_target.u.user.name, jumpto); e = generate_entry(&fw, iptables_matches, &unknown_target); } else { e = generate_entry(&fw, iptables_matches, target->t); } } switch (command) { case CMD_APPEND: ret = append_entry(chain, e, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_CHECK: ret = check_packet(chain, e, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_DELETE: ret = delete_entry(chain, e, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_DELETE_NUM: ret = iptc_delete_num_entry(chain, rulenum - 1, handle); break; case CMD_REPLACE: ret = replace_entry(chain, e, rulenum - 1, saddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_INSERT: ret = insert_entry(chain, e, rulenum - 1, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_LIST: ret = list_entries(chain, options&OPT_VERBOSE, options&OPT_NUMERIC, options&OPT_EXPANDED, options&OPT_LINENUMBERS, handle); break; case CMD_FLUSH: ret = flush_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_ZERO: ret = zero_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_LIST|CMD_ZERO: ret = list_entries(chain, options&OPT_VERBOSE, options&OPT_NUMERIC, options&OPT_EXPANDED, options&OPT_LINENUMBERS, handle); if (ret) ret = zero_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_NEW_CHAIN: ret = iptc_create_chain(chain, handle); break; case CMD_DELETE_CHAIN: ret = delete_chain(chain, options&OPT_VERBOSE, handle); break; case CMD_RENAME_CHAIN: ret = iptc_rename_chain(chain, newname, handle); break; case CMD_SET_POLICY: ret = iptc_set_policy(chain, policy, handle); break; default: /* We should never reach this... */ exit_tryhelp(2); } if (verbose > 1) dump_entries(*handle); return ret; }