diff options
Diffstat (limited to 'sbin/ipfw/nat.c')
-rw-r--r-- | sbin/ipfw/nat.c | 905 |
1 files changed, 905 insertions, 0 deletions
diff --git a/sbin/ipfw/nat.c b/sbin/ipfw/nat.c new file mode 100644 index 0000000..7c2453b --- /dev/null +++ b/sbin/ipfw/nat.c @@ -0,0 +1,905 @@ +/* + * Copyright (c) 2002-2003 Luigi Rizzo + * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp + * Copyright (c) 1994 Ugen J.S.Antsilevich + * + * Idea and grammar partially left from: + * Copyright (c) 1993 Daniel Boulet + * + * Redistribution and use in source forms, with and without modification, + * are permitted provided that this entire comment appears intact. + * + * Redistribution in binary form may occur without any restrictions. + * Obviously, it would be nice if you gave credit where credit is due + * but requiring it would be too onerous. + * + * This software is provided ``AS IS'' without any warranties of any kind. + * + * NEW command line interface for IP firewall facility + * + * $FreeBSD$ + * + * In-kernel nat support + */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/sysctl.h> + +#include "ipfw2.h" + +#include <ctype.h> +#include <err.h> +#include <netdb.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> + +#define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */ + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/route.h> /* def. of struct route */ +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip_fw.h> +#include <arpa/inet.h> +#include <alias.h> + +static struct _s_x nat_params[] = { + { "ip", TOK_IP }, + { "if", TOK_IF }, + { "log", TOK_ALOG }, + { "deny_in", TOK_DENY_INC }, + { "same_ports", TOK_SAME_PORTS }, + { "unreg_only", TOK_UNREG_ONLY }, + { "reset", TOK_RESET_ADDR }, + { "reverse", TOK_ALIAS_REV }, + { "proxy_only", TOK_PROXY_ONLY }, + { "redirect_addr", TOK_REDIR_ADDR }, + { "redirect_port", TOK_REDIR_PORT }, + { "redirect_proto", TOK_REDIR_PROTO }, + { NULL, 0 } /* terminator */ +}; + + +/* + * Search for interface with name "ifn", and fill n accordingly: + * + * n->ip ip address of interface "ifn" + * n->if_name copy of interface name "ifn" + */ +static void +set_addr_dynamic(const char *ifn, struct cfg_nat *n) +{ + size_t needed; + int mib[6]; + char *buf, *lim, *next; + struct if_msghdr *ifm; + struct ifa_msghdr *ifam; + struct sockaddr_dl *sdl; + struct sockaddr_in *sin; + int ifIndex, ifMTU; + + mib[0] = CTL_NET; + mib[1] = PF_ROUTE; + mib[2] = 0; + mib[3] = AF_INET; + mib[4] = NET_RT_IFLIST; + mib[5] = 0; +/* + * Get interface data. + */ + if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) + err(1, "iflist-sysctl-estimate"); + buf = safe_calloc(1, needed); + if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) + err(1, "iflist-sysctl-get"); + lim = buf + needed; +/* + * Loop through interfaces until one with + * given name is found. This is done to + * find correct interface index for routing + * message processing. + */ + ifIndex = 0; + next = buf; + while (next < lim) { + ifm = (struct if_msghdr *)next; + next += ifm->ifm_msglen; + if (ifm->ifm_version != RTM_VERSION) { + if (co.verbose) + warnx("routing message version %d " + "not understood", ifm->ifm_version); + continue; + } + if (ifm->ifm_type == RTM_IFINFO) { + sdl = (struct sockaddr_dl *)(ifm + 1); + if (strlen(ifn) == sdl->sdl_nlen && + strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { + ifIndex = ifm->ifm_index; + ifMTU = ifm->ifm_data.ifi_mtu; + break; + } + } + } + if (!ifIndex) + errx(1, "unknown interface name %s", ifn); +/* + * Get interface address. + */ + sin = NULL; + while (next < lim) { + ifam = (struct ifa_msghdr *)next; + next += ifam->ifam_msglen; + if (ifam->ifam_version != RTM_VERSION) { + if (co.verbose) + warnx("routing message version %d " + "not understood", ifam->ifam_version); + continue; + } + if (ifam->ifam_type != RTM_NEWADDR) + break; + if (ifam->ifam_addrs & RTA_IFA) { + int i; + char *cp = (char *)(ifam + 1); + + for (i = 1; i < RTA_IFA; i <<= 1) { + if (ifam->ifam_addrs & i) + cp += SA_SIZE((struct sockaddr *)cp); + } + if (((struct sockaddr *)cp)->sa_family == AF_INET) { + sin = (struct sockaddr_in *)cp; + break; + } + } + } + if (sin == NULL) + errx(1, "%s: cannot get interface address", ifn); + + n->ip = sin->sin_addr; + strncpy(n->if_name, ifn, IF_NAMESIZE); + + free(buf); +} + +/* + * XXX - The following functions, macros and definitions come from natd.c: + * it would be better to move them outside natd.c, in a file + * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live + * with it. + */ + +/* + * Definition of a port range, and macros to deal with values. + * FORMAT: HI 16-bits == first port in range, 0 == all ports. + * LO 16-bits == number of ports in range + * NOTES: - Port values are not stored in network byte order. + */ + +#define port_range u_long + +#define GETLOPORT(x) ((x) >> 0x10) +#define GETNUMPORTS(x) ((x) & 0x0000ffff) +#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) + +/* Set y to be the low-port value in port_range variable x. */ +#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) + +/* Set y to be the number of ports in port_range variable x. */ +#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) + +static void +StrToAddr (const char* str, struct in_addr* addr) +{ + struct hostent* hp; + + if (inet_aton (str, addr)) + return; + + hp = gethostbyname (str); + if (!hp) + errx (1, "unknown host %s", str); + + memcpy (addr, hp->h_addr, sizeof (struct in_addr)); +} + +static int +StrToPortRange (const char* str, const char* proto, port_range *portRange) +{ + char* sep; + struct servent* sp; + char* end; + u_short loPort; + u_short hiPort; + + /* First see if this is a service, return corresponding port if so. */ + sp = getservbyname (str,proto); + if (sp) { + SETLOPORT(*portRange, ntohs(sp->s_port)); + SETNUMPORTS(*portRange, 1); + return 0; + } + + /* Not a service, see if it's a single port or port range. */ + sep = strchr (str, '-'); + if (sep == NULL) { + SETLOPORT(*portRange, strtol(str, &end, 10)); + if (end != str) { + /* Single port. */ + SETNUMPORTS(*portRange, 1); + return 0; + } + + /* Error in port range field. */ + errx (EX_DATAERR, "%s/%s: unknown service", str, proto); + } + + /* Port range, get the values and sanity check. */ + sscanf (str, "%hu-%hu", &loPort, &hiPort); + SETLOPORT(*portRange, loPort); + SETNUMPORTS(*portRange, 0); /* Error by default */ + if (loPort <= hiPort) + SETNUMPORTS(*portRange, hiPort - loPort + 1); + + if (GETNUMPORTS(*portRange) == 0) + errx (EX_DATAERR, "invalid port range %s", str); + + return 0; +} + +static int +StrToProto (const char* str) +{ + if (!strcmp (str, "tcp")) + return IPPROTO_TCP; + + if (!strcmp (str, "udp")) + return IPPROTO_UDP; + + errx (EX_DATAERR, "unknown protocol %s. Expected tcp or udp", str); +} + +static int +StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, + port_range *portRange) +{ + char* ptr; + + ptr = strchr (str, ':'); + if (!ptr) + errx (EX_DATAERR, "%s is missing port number", str); + + *ptr = '\0'; + ++ptr; + + StrToAddr (str, addr); + return StrToPortRange (ptr, proto, portRange); +} + +/* End of stuff taken from natd.c. */ + +#define INC_ARGCV() do { \ + (*_av)++; \ + (*_ac)--; \ + av = *_av; \ + ac = *_ac; \ +} while(0) + +/* + * The next 3 functions add support for the addr, port and proto redirect and + * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() + * and SetupProtoRedirect() from natd.c. + * + * Every setup_* function fills at least one redirect entry + * (struct cfg_redir) and zero or more server pool entry (struct cfg_spool) + * in buf. + * + * The format of data in buf is: + * + * + * cfg_nat cfg_redir cfg_spool ...... cfg_spool + * + * ------------------------------------- ------------ + * | | .....X ... | | | | ..... + * ------------------------------------- ...... ------------ + * ^ + * spool_cnt n=0 ...... n=(X-1) + * + * len points to the amount of available space in buf + * space counts the memory consumed by every function + * + * XXX - Every function get all the argv params so it + * has to check, in optional parameters, that the next + * args is a valid option for the redir entry and not + * another token. Only redir_port and redir_proto are + * affected by this. + */ + +static int +setup_redir_addr(char *spool_buf, int len, + int *_ac, char ***_av) +{ + char **av, *sep; /* Token separator. */ + /* Temporary buffer used to hold server pool ip's. */ + char tmp_spool_buf[NAT_BUF_LEN]; + int ac, space, lsnat; + struct cfg_redir *r; + struct cfg_spool *tmp; + + av = *_av; + ac = *_ac; + space = 0; + lsnat = 0; + if (len >= SOF_REDIR) { + r = (struct cfg_redir *)spool_buf; + /* Skip cfg_redir at beginning of buf. */ + spool_buf = &spool_buf[SOF_REDIR]; + space = SOF_REDIR; + len -= SOF_REDIR; + } else + goto nospace; + r->mode = REDIR_ADDR; + /* Extract local address. */ + if (ac == 0) + errx(EX_DATAERR, "redirect_addr: missing local address"); + sep = strchr(*av, ','); + if (sep) { /* LSNAT redirection syntax. */ + r->laddr.s_addr = INADDR_NONE; + /* Preserve av, copy spool servers to tmp_spool_buf. */ + strncpy(tmp_spool_buf, *av, strlen(*av)+1); + lsnat = 1; + } else + StrToAddr(*av, &r->laddr); + INC_ARGCV(); + + /* Extract public address. */ + if (ac == 0) + errx(EX_DATAERR, "redirect_addr: missing public address"); + StrToAddr(*av, &r->paddr); + INC_ARGCV(); + + /* Setup LSNAT server pool. */ + if (sep) { + sep = strtok(tmp_spool_buf, ","); + while (sep != NULL) { + tmp = (struct cfg_spool *)spool_buf; + if (len < SOF_SPOOL) + goto nospace; + len -= SOF_SPOOL; + space += SOF_SPOOL; + StrToAddr(sep, &tmp->addr); + tmp->port = ~0; + r->spool_cnt++; + /* Point to the next possible cfg_spool. */ + spool_buf = &spool_buf[SOF_SPOOL]; + sep = strtok(NULL, ","); + } + } + return(space); +nospace: + errx(EX_DATAERR, "redirect_addr: buf is too small\n"); +} + +static int +setup_redir_port(char *spool_buf, int len, + int *_ac, char ***_av) +{ + char **av, *sep, *protoName; + char tmp_spool_buf[NAT_BUF_LEN]; + int ac, space, lsnat; + struct cfg_redir *r; + struct cfg_spool *tmp; + u_short numLocalPorts; + port_range portRange; + + av = *_av; + ac = *_ac; + space = 0; + lsnat = 0; + numLocalPorts = 0; + + if (len >= SOF_REDIR) { + r = (struct cfg_redir *)spool_buf; + /* Skip cfg_redir at beginning of buf. */ + spool_buf = &spool_buf[SOF_REDIR]; + space = SOF_REDIR; + len -= SOF_REDIR; + } else + goto nospace; + r->mode = REDIR_PORT; + /* + * Extract protocol. + */ + if (ac == 0) + errx (EX_DATAERR, "redirect_port: missing protocol"); + r->proto = StrToProto(*av); + protoName = *av; + INC_ARGCV(); + + /* + * Extract local address. + */ + if (ac == 0) + errx (EX_DATAERR, "redirect_port: missing local address"); + + sep = strchr(*av, ','); + /* LSNAT redirection syntax. */ + if (sep) { + r->laddr.s_addr = INADDR_NONE; + r->lport = ~0; + numLocalPorts = 1; + /* Preserve av, copy spool servers to tmp_spool_buf. */ + strncpy(tmp_spool_buf, *av, strlen(*av)+1); + lsnat = 1; + } else { + if (StrToAddrAndPortRange (*av, &r->laddr, protoName, + &portRange) != 0) + errx(EX_DATAERR, "redirect_port:" + "invalid local port range"); + + r->lport = GETLOPORT(portRange); + numLocalPorts = GETNUMPORTS(portRange); + } + INC_ARGCV(); + + /* + * Extract public port and optionally address. + */ + if (ac == 0) + errx (EX_DATAERR, "redirect_port: missing public port"); + + sep = strchr (*av, ':'); + if (sep) { + if (StrToAddrAndPortRange (*av, &r->paddr, protoName, + &portRange) != 0) + errx(EX_DATAERR, "redirect_port:" + "invalid public port range"); + } else { + r->paddr.s_addr = INADDR_ANY; + if (StrToPortRange (*av, protoName, &portRange) != 0) + errx(EX_DATAERR, "redirect_port:" + "invalid public port range"); + } + + r->pport = GETLOPORT(portRange); + r->pport_cnt = GETNUMPORTS(portRange); + INC_ARGCV(); + + /* + * Extract remote address and optionally port. + */ + /* + * NB: isalpha(**av) => we've to check that next parameter is really an + * option for this redirect entry, else stop here processing arg[cv]. + */ + if (ac != 0 && !isalpha(**av)) { + sep = strchr (*av, ':'); + if (sep) { + if (StrToAddrAndPortRange (*av, &r->raddr, protoName, + &portRange) != 0) + errx(EX_DATAERR, "redirect_port:" + "invalid remote port range"); + } else { + SETLOPORT(portRange, 0); + SETNUMPORTS(portRange, 1); + StrToAddr (*av, &r->raddr); + } + INC_ARGCV(); + } else { + SETLOPORT(portRange, 0); + SETNUMPORTS(portRange, 1); + r->raddr.s_addr = INADDR_ANY; + } + r->rport = GETLOPORT(portRange); + r->rport_cnt = GETNUMPORTS(portRange); + + /* + * Make sure port ranges match up, then add the redirect ports. + */ + if (numLocalPorts != r->pport_cnt) + errx(EX_DATAERR, "redirect_port:" + "port ranges must be equal in size"); + + /* Remote port range is allowed to be '0' which means all ports. */ + if (r->rport_cnt != numLocalPorts && + (r->rport_cnt != 1 || r->rport != 0)) + errx(EX_DATAERR, "redirect_port: remote port must" + "be 0 or equal to local port range in size"); + + /* + * Setup LSNAT server pool. + */ + if (lsnat) { + sep = strtok(tmp_spool_buf, ","); + while (sep != NULL) { + tmp = (struct cfg_spool *)spool_buf; + if (len < SOF_SPOOL) + goto nospace; + len -= SOF_SPOOL; + space += SOF_SPOOL; + if (StrToAddrAndPortRange(sep, &tmp->addr, protoName, + &portRange) != 0) + errx(EX_DATAERR, "redirect_port:" + "invalid local port range"); + if (GETNUMPORTS(portRange) != 1) + errx(EX_DATAERR, "redirect_port: local port" + "must be single in this context"); + tmp->port = GETLOPORT(portRange); + r->spool_cnt++; + /* Point to the next possible cfg_spool. */ + spool_buf = &spool_buf[SOF_SPOOL]; + sep = strtok(NULL, ","); + } + } + return (space); +nospace: + errx(EX_DATAERR, "redirect_port: buf is too small\n"); +} + +static int +setup_redir_proto(char *spool_buf, int len, + int *_ac, char ***_av) +{ + char **av; + int ac, space; + struct protoent *protoent; + struct cfg_redir *r; + + av = *_av; + ac = *_ac; + if (len >= SOF_REDIR) { + r = (struct cfg_redir *)spool_buf; + /* Skip cfg_redir at beginning of buf. */ + spool_buf = &spool_buf[SOF_REDIR]; + space = SOF_REDIR; + len -= SOF_REDIR; + } else + goto nospace; + r->mode = REDIR_PROTO; + /* + * Extract protocol. + */ + if (ac == 0) + errx(EX_DATAERR, "redirect_proto: missing protocol"); + + protoent = getprotobyname(*av); + if (protoent == NULL) + errx(EX_DATAERR, "redirect_proto: unknown protocol %s", *av); + else + r->proto = protoent->p_proto; + + INC_ARGCV(); + + /* + * Extract local address. + */ + if (ac == 0) + errx(EX_DATAERR, "redirect_proto: missing local address"); + else + StrToAddr(*av, &r->laddr); + + INC_ARGCV(); + + /* + * Extract optional public address. + */ + if (ac == 0) { + r->paddr.s_addr = INADDR_ANY; + r->raddr.s_addr = INADDR_ANY; + } else { + /* see above in setup_redir_port() */ + if (!isalpha(**av)) { + StrToAddr(*av, &r->paddr); + INC_ARGCV(); + + /* + * Extract optional remote address. + */ + /* see above in setup_redir_port() */ + if (ac!=0 && !isalpha(**av)) { + StrToAddr(*av, &r->raddr); + INC_ARGCV(); + } + } + } + return (space); +nospace: + errx(EX_DATAERR, "redirect_proto: buf is too small\n"); +} + +static void +print_nat_config(unsigned char *buf) +{ + struct cfg_nat *n; + int i, cnt, flag, off; + struct cfg_redir *t; + struct cfg_spool *s; + struct protoent *p; + + n = (struct cfg_nat *)buf; + flag = 1; + off = sizeof(*n); + printf("ipfw nat %u config", n->id); + if (strlen(n->if_name) != 0) + printf(" if %s", n->if_name); + else if (n->ip.s_addr != 0) + printf(" ip %s", inet_ntoa(n->ip)); + while (n->mode != 0) { + if (n->mode & PKT_ALIAS_LOG) { + printf(" log"); + n->mode &= ~PKT_ALIAS_LOG; + } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { + printf(" deny_in"); + n->mode &= ~PKT_ALIAS_DENY_INCOMING; + } else if (n->mode & PKT_ALIAS_SAME_PORTS) { + printf(" same_ports"); + n->mode &= ~PKT_ALIAS_SAME_PORTS; + } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { + printf(" unreg_only"); + n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; + } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { + printf(" reset"); + n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; + } else if (n->mode & PKT_ALIAS_REVERSE) { + printf(" reverse"); + n->mode &= ~PKT_ALIAS_REVERSE; + } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { + printf(" proxy_only"); + n->mode &= ~PKT_ALIAS_PROXY_ONLY; + } + } + /* Print all the redirect's data configuration. */ + for (cnt = 0; cnt < n->redir_cnt; cnt++) { + t = (struct cfg_redir *)&buf[off]; + off += SOF_REDIR; + switch (t->mode) { + case REDIR_ADDR: + printf(" redirect_addr"); + if (t->spool_cnt == 0) + printf(" %s", inet_ntoa(t->laddr)); + else + for (i = 0; i < t->spool_cnt; i++) { + s = (struct cfg_spool *)&buf[off]; + if (i) + printf(","); + else + printf(" "); + printf("%s", inet_ntoa(s->addr)); + off += SOF_SPOOL; + } + printf(" %s", inet_ntoa(t->paddr)); + break; + case REDIR_PORT: + p = getprotobynumber(t->proto); + printf(" redirect_port %s ", p->p_name); + if (!t->spool_cnt) { + printf("%s:%u", inet_ntoa(t->laddr), t->lport); + if (t->pport_cnt > 1) + printf("-%u", t->lport + + t->pport_cnt - 1); + } else + for (i=0; i < t->spool_cnt; i++) { + s = (struct cfg_spool *)&buf[off]; + if (i) + printf(","); + printf("%s:%u", inet_ntoa(s->addr), + s->port); + off += SOF_SPOOL; + } + + printf(" "); + if (t->paddr.s_addr) + printf("%s:", inet_ntoa(t->paddr)); + printf("%u", t->pport); + if (!t->spool_cnt && t->pport_cnt > 1) + printf("-%u", t->pport + t->pport_cnt - 1); + + if (t->raddr.s_addr) { + printf(" %s", inet_ntoa(t->raddr)); + if (t->rport) { + printf(":%u", t->rport); + if (!t->spool_cnt && t->rport_cnt > 1) + printf("-%u", t->rport + + t->rport_cnt - 1); + } + } + break; + case REDIR_PROTO: + p = getprotobynumber(t->proto); + printf(" redirect_proto %s %s", p->p_name, + inet_ntoa(t->laddr)); + if (t->paddr.s_addr != 0) { + printf(" %s", inet_ntoa(t->paddr)); + if (t->raddr.s_addr) + printf(" %s", inet_ntoa(t->raddr)); + } + break; + default: + errx(EX_DATAERR, "unknown redir mode"); + break; + } + } + printf("\n"); +} + +void +ipfw_config_nat(int ac, char **av) +{ + struct cfg_nat *n; /* Nat instance configuration. */ + int i, len, off, tok; + char *id, buf[NAT_BUF_LEN]; /* Buffer for serialized data. */ + + len = NAT_BUF_LEN; + /* Offset in buf: save space for n at the beginning. */ + off = sizeof(*n); + memset(buf, 0, sizeof(buf)); + n = (struct cfg_nat *)buf; + + av++; ac--; + /* Nat id. */ + if (ac && isdigit(**av)) { + id = *av; + i = atoi(*av); + ac--; av++; + n->id = i; + } else + errx(EX_DATAERR, "missing nat id"); + if (ac == 0) + errx(EX_DATAERR, "missing option"); + + while (ac > 0) { + tok = match_token(nat_params, *av); + ac--; av++; + switch (tok) { + case TOK_IP: + if (ac == 0) + errx(EX_DATAERR, "missing option"); + if (!inet_aton(av[0], &(n->ip))) + errx(EX_DATAERR, "bad ip address ``%s''", + av[0]); + ac--; av++; + break; + case TOK_IF: + if (ac == 0) + errx(EX_DATAERR, "missing option"); + set_addr_dynamic(av[0], n); + ac--; av++; + break; + case TOK_ALOG: + n->mode |= PKT_ALIAS_LOG; + break; + case TOK_DENY_INC: + n->mode |= PKT_ALIAS_DENY_INCOMING; + break; + case TOK_SAME_PORTS: + n->mode |= PKT_ALIAS_SAME_PORTS; + break; + case TOK_UNREG_ONLY: + n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; + break; + case TOK_RESET_ADDR: + n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; + break; + case TOK_ALIAS_REV: + n->mode |= PKT_ALIAS_REVERSE; + break; + case TOK_PROXY_ONLY: + n->mode |= PKT_ALIAS_PROXY_ONLY; + break; + /* + * All the setup_redir_* functions work directly in the final + * buffer, see above for details. + */ + case TOK_REDIR_ADDR: + case TOK_REDIR_PORT: + case TOK_REDIR_PROTO: + switch (tok) { + case TOK_REDIR_ADDR: + i = setup_redir_addr(&buf[off], len, &ac, &av); + break; + case TOK_REDIR_PORT: + i = setup_redir_port(&buf[off], len, &ac, &av); + break; + case TOK_REDIR_PROTO: + i = setup_redir_proto(&buf[off], len, &ac, &av); + break; + } + n->redir_cnt++; + off += i; + len -= i; + break; + default: + errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); + } + } + + i = do_cmd(IP_FW_NAT_CFG, buf, off); + if (i) + err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); + + if (!co.do_quiet) { + /* After every modification, we show the resultant rule. */ + int _ac = 3; + char *_av[] = {"show", "config", id}; + ipfw_show_nat(_ac, _av); + } +} + + +void +ipfw_show_nat(int ac, char **av) +{ + struct cfg_nat *n; + struct cfg_redir *e; + int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; + int nat_cnt, redir_cnt, r; + uint8_t *data, *p; + char *endptr; + + do_rule = 0; + nalloc = 1024; + size = 0; + data = NULL; + frule = 0; + lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */ + ac--; av++; + + if (co.test_only) + return; + + /* Parse parameters. */ + for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { + if (!strncmp(av[0], "config", strlen(av[0]))) { + cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; + continue; + } + /* Convert command line rule #. */ + frule = lrule = strtoul(av[0], &endptr, 10); + if (*endptr == '-') + lrule = strtoul(endptr+1, &endptr, 10); + if (lrule == 0) + err(EX_USAGE, "invalid rule number: %s", av[0]); + do_rule = 1; + } + + nbytes = nalloc; + while (nbytes >= nalloc) { + nalloc = nalloc * 2; + nbytes = nalloc; + data = safe_realloc(data, nbytes); + if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) + err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", + (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); + } + if (nbytes == 0) + exit(0); + if (do_cfg) { + nat_cnt = *((int *)data); + for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { + n = (struct cfg_nat *)&data[i]; + if (frule <= n->id && lrule >= n->id) + print_nat_config(&data[i]); + i += sizeof(struct cfg_nat); + for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) { + e = (struct cfg_redir *)&data[i]; + i += sizeof(struct cfg_redir) + e->spool_cnt * + sizeof(struct cfg_spool); + } + } + } else { + for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { + p = &data[i]; + if (p == data + nbytes) + break; + bcopy(p, &r, sizeof(int)); + if (do_rule) { + if (!(frule <= r && lrule >= r)) + continue; + } + printf("nat %u: %s\n", r, p+sizeof(int)); + } + } +} |