diff options
Diffstat (limited to 'sbin/ipfw/main.c')
| -rw-r--r-- | sbin/ipfw/main.c | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/sbin/ipfw/main.c b/sbin/ipfw/main.c new file mode 100644 index 0000000..5cb5a42 --- /dev/null +++ b/sbin/ipfw/main.c @@ -0,0 +1,539 @@ +/* + * 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. + * + * Command line interface for IP firewall facility + * + * $FreeBSD$ + */ + +#include <sys/wait.h> +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> + +#include "ipfw2.h" + +static void +help(void) +{ + fprintf(stderr, +"ipfw syntax summary (but please do read the ipfw(8) manpage):\n\n" +"\tipfw [-abcdefhnNqStTv] <command>\n\n" +"where <command> is one of the following:\n\n" +"add [num] [set N] [prob x] RULE-BODY\n" +"{pipe|queue} N config PIPE-BODY\n" +"[pipe|queue] {zero|delete|show} [N{,N}]\n" +"nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|reset|\n" +" reverse|proxy_only|redirect_addr linkspec|\n" +" redirect_port linkspec|redirect_proto linkspec}\n" +"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" +"set N {show|list|zero|resetlog|delete} [N{,N}] | flush\n" +"table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" +"table all {flush | list}\n" +"\n" +"RULE-BODY: check-state [PARAMS] | ACTION [PARAMS] ADDR [OPTION_LIST]\n" +"ACTION: check-state | allow | count | deny | unreach{,6} CODE |\n" +" skipto N | {divert|tee} PORT | forward ADDR |\n" +" pipe N | queue N | nat N | setfib FIB\n" +"PARAMS: [log [logamount LOGLIMIT]] [altq QUEUE_NAME]\n" +"ADDR: [ MAC dst src ether_type ] \n" +" [ ip from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" +" [ ipv6|ip6 from IP6ADDR [ PORT ] to IP6ADDR [ PORTLIST ] ]\n" +"IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" +"IP6ADDR: [not] { any | me | me6 | ip6/bits | IP6LIST }\n" +"IP6LIST: { ip6 | ip6/bits }[,IP6LIST]\n" +"IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" +"OPTION_LIST: OPTION [OPTION_LIST]\n" +"OPTION: bridged | diverted | diverted-loopback | diverted-output |\n" +" {dst-ip|src-ip} IPADDR | {dst-ip6|src-ip6|dst-ipv6|src-ipv6} IP6ADDR |\n" +" {dst-port|src-port} LIST |\n" +" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" +" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" +" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" +" icmp6types LIST | ext6hdr LIST | flow-id N[,N] | fib FIB |\n" +" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" +" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" +" tcpdatalen LIST | verrevpath | versrcreach | antispoof\n" +); + + exit(0); +} + +/* + * Free a the (locally allocated) copy of command line arguments. + */ +static void +free_args(int ac, char **av) +{ + int i; + + for (i=0; i < ac; i++) + free(av[i]); + free(av); +} + +/* + * Called with the arguments, including program name because getopt + * wants it to be present. + * Returns 0 if successful, 1 if empty command, errx() in case of errors. + */ +static int +ipfw_main(int oldac, char **oldav) +{ + int ch, ac, save_ac; + const char *errstr; + char **av, **save_av; + int do_acct = 0; /* Show packet/byte count */ + +#define WHITESP " \t\f\v\n\r" + if (oldac < 2) + return 1; /* need at least one argument */ + + if (oldac == 2) { + /* + * If we are called with a single string, try to split it into + * arguments for subsequent parsing. + * But first, remove spaces after a ',', by copying the string + * in-place. + */ + char *arg = oldav[1]; /* The string is the first arg. */ + int l = strlen(arg); + int copy = 0; /* 1 if we need to copy, 0 otherwise */ + int i, j; + + for (i = j = 0; i < l; i++) { + if (arg[i] == '#') /* comment marker */ + break; + if (copy) { + arg[j++] = arg[i]; + copy = !index("," WHITESP, arg[i]); + } else { + copy = !index(WHITESP, arg[i]); + if (copy) + arg[j++] = arg[i]; + } + } + if (!copy && j > 0) /* last char was a 'blank', remove it */ + j--; + l = j; /* the new argument length */ + arg[j++] = '\0'; + if (l == 0) /* empty string! */ + return 1; + + /* + * First, count number of arguments. Because of the previous + * processing, this is just the number of blanks plus 1. + */ + for (i = 0, ac = 1; i < l; i++) + if (index(WHITESP, arg[i]) != NULL) + ac++; + + /* + * Allocate the argument list, including one entry for + * the program name because getopt expects it. + */ + av = safe_calloc(ac + 1, sizeof(char *)); + + /* + * Second, copy arguments from arg[] to av[]. For each one, + * j is the initial character, i is the one past the end. + */ + for (ac = 1, i = j = 0; i < l; i++) + if (index(WHITESP, arg[i]) != NULL || i == l-1) { + if (i == l-1) + i++; + av[ac] = safe_calloc(i-j+1, 1); + bcopy(arg+j, av[ac], i-j); + ac++; + j = i + 1; + } + } else { + /* + * If an argument ends with ',' join with the next one. + */ + int first, i, l; + + av = safe_calloc(oldac, sizeof(char *)); + for (first = i = ac = 1, l = 0; i < oldac; i++) { + char *arg = oldav[i]; + int k = strlen(arg); + + l += k; + if (arg[k-1] != ',' || i == oldac-1) { + /* Time to copy. */ + av[ac] = safe_calloc(l+1, 1); + for (l=0; first <= i; first++) { + strcat(av[ac]+l, oldav[first]); + l += strlen(oldav[first]); + } + ac++; + l = 0; + first = i+1; + } + } + } + + av[0] = strdup(oldav[0]); /* copy progname from the caller */ + /* Set the force flag for non-interactive processes */ + if (!co.do_force) + co.do_force = !isatty(STDIN_FILENO); + + /* Save arguments for final freeing of memory. */ + save_ac = ac; + save_av = av; + + optind = optreset = 1; /* restart getopt() */ + while ((ch = getopt(ac, av, "abcdefhinNqs:STtv")) != -1) + switch (ch) { + case 'a': + do_acct = 1; + break; + + case 'b': + co.comment_only = 1; + co.do_compact = 1; + break; + + case 'c': + co.do_compact = 1; + break; + + case 'd': + co.do_dynamic = 1; + break; + + case 'e': + co.do_expired = 1; + break; + + case 'f': + co.do_force = 1; + break; + + case 'h': /* help */ + free_args(save_ac, save_av); + help(); + break; /* NOTREACHED */ + + case 'i': + co.do_value_as_ip = 1; + break; + + case 'n': + co.test_only = 1; + break; + + case 'N': + co.do_resolv = 1; + break; + + case 'q': + co.do_quiet = 1; + break; + + case 's': /* sort */ + co.do_sort = atoi(optarg); + break; + + case 'S': + co.show_sets = 1; + break; + + case 't': + co.do_time = 1; + break; + + case 'T': + co.do_time = 2; /* numeric timestamp */ + break; + + case 'v': /* verbose */ + co.verbose = 1; + break; + + default: + free_args(save_ac, save_av); + return 1; + } + + ac -= optind; + av += optind; + NEED1("bad arguments, for usage summary ``ipfw''"); + + /* + * An undocumented behaviour of ipfw1 was to allow rule numbers first, + * e.g. "100 add allow ..." instead of "add 100 allow ...". + * In case, swap first and second argument to get the normal form. + */ + if (ac > 1 && isdigit(*av[0])) { + char *p = av[0]; + + av[0] = av[1]; + av[1] = p; + } + + /* + * Optional: pipe, queue or nat. + */ + co.do_nat = 0; + co.do_pipe = 0; + if (!strncmp(*av, "nat", strlen(*av))) + co.do_nat = 1; + else if (!strncmp(*av, "pipe", strlen(*av))) + co.do_pipe = 1; + else if (_substrcmp(*av, "queue") == 0) + co.do_pipe = 2; + else if (!strncmp(*av, "set", strlen(*av))) { + if (ac > 1 && isdigit(av[1][0])) { + co.use_set = strtonum(av[1], 0, resvd_set_number, + &errstr); + if (errstr) + errx(EX_DATAERR, + "invalid set number %s\n", av[1]); + ac -= 2; av += 2; co.use_set++; + } + } + + if (co.do_pipe || co.do_nat) { + ac--; + av++; + } + NEED1("missing command"); + + /* + * For pipes, queues and nats we normally say 'nat|pipe NN config' + * but the code is easier to parse as 'nat|pipe config NN' + * so we swap the two arguments. + */ + if ((co.do_pipe || co.do_nat) && ac > 1 && isdigit(*av[0])) { + char *p = av[0]; + + av[0] = av[1]; + av[1] = p; + } + + int try_next = 0; + if (co.use_set == 0) { + if (_substrcmp(*av, "add") == 0) + ipfw_add(ac, av); + else if (co.do_nat && _substrcmp(*av, "show") == 0) + ipfw_show_nat(ac, av); + else if (co.do_pipe && _substrcmp(*av, "config") == 0) + ipfw_config_pipe(ac, av); + else if (co.do_nat && _substrcmp(*av, "config") == 0) + ipfw_config_nat(ac, av); + else if (_substrcmp(*av, "set") == 0) + ipfw_sets_handler(ac, av); + else if (_substrcmp(*av, "table") == 0) + ipfw_table_handler(ac, av); + else if (_substrcmp(*av, "enable") == 0) + ipfw_sysctl_handler(ac, av, 1); + else if (_substrcmp(*av, "disable") == 0) + ipfw_sysctl_handler(ac, av, 0); + else + try_next = 1; + } + + if (co.use_set || try_next) { + if (_substrcmp(*av, "delete") == 0) + ipfw_delete(ac, av); + else if (_substrcmp(*av, "flush") == 0) + ipfw_flush(co.do_force); + else if (_substrcmp(*av, "zero") == 0) + ipfw_zero(ac, av, 0 /* IP_FW_ZERO */); + else if (_substrcmp(*av, "resetlog") == 0) + ipfw_zero(ac, av, 1 /* IP_FW_RESETLOG */); + else if (_substrcmp(*av, "print") == 0 || + _substrcmp(*av, "list") == 0) + ipfw_list(ac, av, do_acct); + else if (_substrcmp(*av, "show") == 0) + ipfw_list(ac, av, 1 /* show counters */); + else + errx(EX_USAGE, "bad command `%s'", *av); + } + + /* Free memory allocated in the argument parsing. */ + free_args(save_ac, save_av); + return 0; +} + + +static void +ipfw_readfile(int ac, char *av[]) +{ +#define MAX_ARGS 32 + char buf[BUFSIZ]; + char *progname = av[0]; /* original program name */ + const char *cmd = NULL; /* preprocessor name, if any */ + const char *filename = av[ac-1]; /* file to read */ + int c, lineno=0; + FILE *f = NULL; + pid_t preproc = 0; + + while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { + switch(c) { + case 'c': + co.do_compact = 1; + break; + + case 'f': + co.do_force = 1; + break; + + case 'N': + co.do_resolv = 1; + break; + + case 'n': + co.test_only = 1; + break; + + case 'p': + /* + * ipfw -p cmd [args] filename + * + * We are done with getopt(). All arguments + * except the filename go to the preprocessor, + * so we need to do the following: + * - check that a filename is actually present; + * - advance av by optind-1 to skip arguments + * already processed; + * - decrease ac by optind, to remove the args + * already processed and the final filename; + * - set the last entry in av[] to NULL so + * popen() can detect the end of the array; + * - set optind=ac to let getopt() terminate. + */ + if (optind == ac) + errx(EX_USAGE, "no filename argument"); + cmd = optarg; + av[ac-1] = NULL; + av += optind - 1; + ac -= optind; + optind = ac; + break; + + case 'q': + co.do_quiet = 1; + break; + + case 'S': + co.show_sets = 1; + break; + + default: + errx(EX_USAGE, "bad arguments, for usage" + " summary ``ipfw''"); + } + + } + + if (cmd == NULL && ac != optind + 1) + errx(EX_USAGE, "extraneous filename arguments %s", av[ac-1]); + + if ((f = fopen(filename, "r")) == NULL) + err(EX_UNAVAILABLE, "fopen: %s", filename); + + if (cmd != NULL) { /* pipe through preprocessor */ + int pipedes[2]; + + if (pipe(pipedes) == -1) + err(EX_OSERR, "cannot create pipe"); + + preproc = fork(); + if (preproc == -1) + err(EX_OSERR, "cannot fork"); + + if (preproc == 0) { + /* + * Child, will run the preprocessor with the + * file on stdin and the pipe on stdout. + */ + if (dup2(fileno(f), 0) == -1 + || dup2(pipedes[1], 1) == -1) + err(EX_OSERR, "dup2()"); + fclose(f); + close(pipedes[1]); + close(pipedes[0]); + execvp(cmd, av); + err(EX_OSERR, "execvp(%s) failed", cmd); + } else { /* parent, will reopen f as the pipe */ + fclose(f); + close(pipedes[1]); + if ((f = fdopen(pipedes[0], "r")) == NULL) { + int savederrno = errno; + + (void)kill(preproc, SIGTERM); + errno = savederrno; + err(EX_OSERR, "fdopen()"); + } + } + } + + while (fgets(buf, BUFSIZ, f)) { /* read commands */ + char linename[10]; + char *args[2]; + + lineno++; + sprintf(linename, "Line %d", lineno); + setprogname(linename); /* XXX */ + args[0] = progname; + args[1] = buf; + ipfw_main(2, args); + } + fclose(f); + if (cmd != NULL) { + int status; + + if (waitpid(preproc, &status, 0) == -1) + errx(EX_OSERR, "waitpid()"); + if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) + errx(EX_UNAVAILABLE, + "preprocessor exited with status %d", + WEXITSTATUS(status)); + else if (WIFSIGNALED(status)) + errx(EX_UNAVAILABLE, + "preprocessor exited with signal %d", + WTERMSIG(status)); + } +} + +int +main(int ac, char *av[]) +{ + /* + * If the last argument is an absolute pathname, interpret it + * as a file to be preprocessed. + */ + + if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) + ipfw_readfile(ac, av); + else { + if (ipfw_main(ac, av)) { + errx(EX_USAGE, + "usage: ipfw [options]\n" + "do \"ipfw -h\" or \"man ipfw\" for details"); + } + } + return EX_OK; +} |
