diff options
Diffstat (limited to 'sbin/ipfw')
-rw-r--r-- | sbin/ipfw/ipfw.8 | 42 | ||||
-rw-r--r-- | sbin/ipfw/ipfw.c | 160 |
2 files changed, 72 insertions, 130 deletions
diff --git a/sbin/ipfw/ipfw.8 b/sbin/ipfw/ipfw.8 index d2bad95..c1f63a2 100644 --- a/sbin/ipfw/ipfw.8 +++ b/sbin/ipfw/ipfw.8 @@ -5,7 +5,7 @@ .Nm ipfw .Nd controlling utility for IP firewall .Sh SYNOPSIS -.Nm ipfw +.Nm .Ar file .Nm ipfw flush @@ -47,10 +47,12 @@ via If used as shown in the first synopsis line, the .Ar file will be read line by line and applied as arguments to the -.Nm ipfw +.Nm command. .Pp -The ipfw code works by going through the rule-list for each packet, +The +.Nm +code works by going through the rule-list for each packet, until a match is found. All rules have two associated counters, a packet count and a byte count. @@ -142,6 +144,10 @@ Only TCP packets match. Only UDP packets match. .It Nm icmp Only ICMP packets match. +.It Nm <number|name> +Only packets for the specified protocol matches (see +.Pa /etc/protocols +for a complete list). .El .Pp .Ar src @@ -249,14 +255,6 @@ Matches if the ICMP type is in the list .Ar types . The list may be specified as any combination of ranges or individual types separated by commas. -.It proto Ar ipproto -Matches if the protocol field in the IP header matches -any of the protocol numbers specified by the list -.Ar ipproto -(see -.Pa /etc/protocols -for a complete list). -Protocol ranges may not be used. .El .Sh CHECKLIST Here are some important points to consider when designing your @@ -324,8 +322,6 @@ This rule diverts all incoming packets from 192.168.2.0/24 to divert port 5000: .Pp .Dl ipfw divert 5000 all from 192.168.2.0/24 to any in .Sh SEE ALSO -.Xr gethostbyname 3 , -.Xr getservbyport 3 , .Xr divert 4 , .Xr ip 4 , .Xr ipfirewall 4 , @@ -345,16 +341,12 @@ do anything you don't understand. .Pp When manipulating/adding chain entries, service and protocol names are not accepted. +.Sh AUTHORS +Ugen J. S. Antsilevich, +Poul-Henning Kamp, +Alex Nash, +Archie Cobbs. +API based upon code written by Daniel Boulet for BSDI. .Sh HISTORY -Initially this utility was written for BSDI by: -.Pp -.Dl Daniel Boulet <danny@BouletFermat.ab.ca> -.Pp -The FreeBSD version is written completely by: -.Pp -.Dl Ugen J.S.Antsilevich <ugen@FreeBSD.ORG> -.Pp -This has all been extensively rearranged by Poul-Henning Kamp and -Alex Nash. -.Pp -Packet diversion added by Archie Cobbs <archie@whistle.com>. +.Nm +first appeared in FreeBSD 2.0. diff --git a/sbin/ipfw/ipfw.c b/sbin/ipfw/ipfw.c index fdc5ed0..b466bab 100644 --- a/sbin/ipfw/ipfw.c +++ b/sbin/ipfw/ipfw.c @@ -1,7 +1,7 @@ /* - * Copyright (c) 1996 Alex Nash - * Copyright (c) 1996 Poul-Henning Kamp + * 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 * @@ -16,7 +16,7 @@ * * NEW command line interface for IP firewall facility * - * $Id: ipfw.c,v 1.30 1996/08/05 02:38:51 alex Exp $ + * $Id: ipfw.c,v 1.31 1996/08/13 00:41:05 pst Exp $ * */ @@ -66,43 +66,27 @@ mask_bits(m_ad) } void -print_port(port, comma, flg) - u_short port,flg; +print_port(prot, port, comma) + u_char prot; + u_short port; const char *comma; { + struct servent *se; + struct protoent *pe; + const char *protocol; int printed = 0; if (do_resolv) { - struct servent *se; - struct protoent *pe; - const char *protocol; - - switch (flg & IP_FW_F_KIND) { - case IP_FW_F_TCP: - protocol = "tcp"; - break; - case IP_FW_F_UDP: - protocol = "udp"; - break; - default: - protocol = NULL; - break; - } - - if (protocol) { - se = getservbyport(htons(port), protocol); - - if (se) { - printf("%s%s", comma, se->s_name); - printed = 1; - } - } else { - pe = getprotobynumber(port); + pe = getprotobynumber(prot); + if (pe) + protocol = pe->p_name; + else + protocol = NULL; - if (pe) { - printf("%s%s", comma, pe->p_name); - printed = 1; - } + se = getservbyport(htons(port), protocol); + if (se) { + printf("%s%s", comma, se->s_name); + printed = 1; } } if (!printed) @@ -116,7 +100,8 @@ show_ipfw(chain) char *comma; u_long adrt; struct hostent *he; - int i,mb; + struct protoent *pe; + int i, mb; if (do_resolv) setservent(1/*stayopen*/); @@ -164,24 +149,13 @@ show_ipfw(chain) if (chain->fw_flg & IP_FW_F_PRN) printf(" log"); - switch (chain->fw_flg & IP_FW_F_KIND) { - case IP_FW_F_ICMP: - printf(" icmp "); - break; - case IP_FW_F_TCP: - printf(" tcp "); - break; - case IP_FW_F_UDP: - printf(" udp "); - break; - case IP_FW_F_ALL: - printf(" ip "); - break; - default: - break; - } + pe = getprotobynumber(chain->fw_prot); + if (pe) + printf(" %s", pe->p_name); + else + printf("%u", chain->fw_prot); - printf("from "); + printf(" from "); adrt=ntohl(chain->fw_smsk.s_addr); if (adrt==ULONG_MAX && do_resolv) { @@ -210,10 +184,10 @@ show_ipfw(chain) printf(inet_ntoa(chain->fw_src)); } - if ((chain->fw_flg & IP_FW_F_KIND) != IP_FW_F_ALL) { + if (chain->fw_prot != IPPROTO_IP) { comma = " "; for (i=0;i<chain->fw_nsp; i++ ) { - print_port(chain->fw_pts[i], comma, chain->fw_flg); + print_port(chain->fw_prot, chain->fw_pts[i], comma); if (i==0 && (chain->fw_flg & IP_FW_F_SRNG)) comma = "-"; else @@ -252,25 +226,14 @@ show_ipfw(chain) comma = " "; for (i=0;i<chain->fw_ndp;i++) { - print_port(chain->fw_pts[chain->fw_nsp+i], comma, chain->fw_flg); + print_port(chain->fw_prot, chain->fw_pts[chain->fw_nsp+i], + comma); if (i==0 && (chain->fw_flg & IP_FW_F_DRNG)) comma = "-"; else comma = ","; } - if ((chain->fw_flg & IP_FW_F_KIND) == IP_FW_F_ALL && chain->fw_nsp) { - printf(" proto"); - comma = " "; - for (i=0;i<chain->fw_nsp; i++) { - print_port(chain->fw_pts[i], comma, chain->fw_flg); - if (i==0 && (chain->fw_flg & IP_FW_F_SRNG)) - comma = "-"; - else - comma = ","; - } - } - if ((chain->fw_flg & IP_FW_F_IN) && (chain->fw_flg & IP_FW_F_OUT)) ; else if (chain->fw_flg & IP_FW_F_IN) @@ -387,7 +350,7 @@ show_usage(str) "\t\tzero [number]\n" "\trule:\taction proto src dst extras...\n" "\t\taction: {allow|deny|reject|count|divert port} [log]\n" -"\t\tproto: {ip|tcp|udp|icmp}}\n" +"\t\tproto: {ip|tcp|udp|icmp|<number>}}\n" "\t\tsrc: from {any|ip[{/bits|:mask}]} [{port|port-port},[port],...]\n" "\t\tdst: to {any|ip[{/bits|:mask}]} [{port|port-port},[port],...]\n" "\textras:\n" @@ -470,22 +433,17 @@ fill_ip(ipno, mask, acp, avp) } void -add_port(cnt, ptr, off, port, proto) +add_port(cnt, ptr, off, port) u_short *cnt, *ptr, off, port; - int proto; { - if (proto && port > 255) - errx(1, "proto must be in the range 0-255"); if (off + *cnt >= IP_FW_MAX_PORTS) - errx(1, "too many %s (max is %d)", - proto ? "protocols" : "ports", - IP_FW_MAX_PORTS); + errx(1, "too many ports (max is %d)", IP_FW_MAX_PORTS); ptr[off+*cnt] = port; (*cnt)++; } int -fill_port(cnt, ptr, off, arg, proto) +fill_port(cnt, ptr, off, arg) u_short *cnt, *ptr, off; char *arg; { @@ -494,17 +452,15 @@ fill_port(cnt, ptr, off, arg, proto) s = strchr(arg,'-'); if (s) { - if (proto) - errx(1,"proto ranges are not allowed"); *s++ = '\0'; if (strchr(arg, ',')) errx(1, "port range must be first in list"); - add_port(cnt, ptr, off, *arg ? atoi(arg) : 0x0000, proto); + add_port(cnt, ptr, off, *arg ? atoi(arg) : 0x0000); arg = s; s = strchr(arg,','); if (s) *s++ = '\0'; - add_port(cnt, ptr, off, *arg ? atoi(arg) : 0xffff, proto); + add_port(cnt, ptr, off, *arg ? atoi(arg) : 0xffff); arg = s; initial_range = 1; } @@ -512,7 +468,7 @@ fill_port(cnt, ptr, off, arg, proto) s = strchr(arg,','); if (s) *s++ = '\0'; - add_port(cnt, ptr, off, atoi(arg), proto); + add_port(cnt, ptr, off, atoi(arg)); arg = s; } return initial_range; @@ -644,6 +600,8 @@ add(ac,av) { struct ip_fw rule; int i; + u_char proto; + struct protoent *pe; memset(&rule, 0, sizeof rule); @@ -683,19 +641,18 @@ add(ac,av) } /* protocol */ - if (ac && !strncmp(*av,"ip",strlen(*av))) { - rule.fw_flg |= IP_FW_F_ALL; av++; ac--; - } else if (ac && !strncmp(*av,"all",strlen(*av))) { - rule.fw_flg |= IP_FW_F_ALL; av++; ac--; - } else if (ac && !strncmp(*av,"tcp",strlen(*av))) { - rule.fw_flg |= IP_FW_F_TCP; av++; ac--; - } else if (ac && !strncmp(*av,"udp",strlen(*av))) { - rule.fw_flg |= IP_FW_F_UDP; av++; ac--; - } else if (ac && !strncmp(*av,"icmp",strlen(*av))) { - rule.fw_flg |= IP_FW_F_ICMP; av++; ac--; - } else { + if (ac) { + if ((proto = atoi(*av)) > 0) { + rule.fw_prot = proto; av++; ac--; + } else if (!strncmp(*av,"all",strlen(*av))) { + rule.fw_prot = IPPROTO_IP; av++; ac--; + } else if ((pe = getprotobyname(*av)) != NULL) { + rule.fw_prot = pe->p_proto; av++; ac--; + } else { + show_usage("invalid protocol\n"); + } + } else show_usage("missing protocol\n"); - } /* from */ if (ac && !strncmp(*av,"from",strlen(*av))) { av++; ac--; } @@ -723,9 +680,9 @@ add(ac,av) av++; ac--; } - if ((rule.fw_flg & IP_FW_F_KIND) != IP_FW_F_TCP && - (rule.fw_flg & IP_FW_F_KIND) != IP_FW_F_UDP && - (rule.fw_nsp || rule.fw_ndp)) { + if ((rule.fw_prot != IPPROTO_TCP) && + (rule.fw_prot != IPPROTO_UDP) && + (rule.fw_nsp || rule.fw_ndp)) { show_usage("only TCP and UDP protocols are valid with port specifications"); } @@ -768,7 +725,7 @@ add(ac,av) fill_ipopt(&rule.fw_ipopt, &rule.fw_ipnopt, av); av++; ac--; continue; } - if ((rule.fw_flg & IP_FW_F_KIND) == IP_FW_F_TCP) { + if (rule.fw_prot == IPPROTO_TCP) { if (!strncmp(*av,"established",strlen(*av))) { rule.fw_tcpf |= IP_FW_TCPF_ESTAB; av++; ac--; continue; @@ -784,20 +741,13 @@ add(ac,av) av++; ac--; continue; } } - if ((rule.fw_flg & IP_FW_F_KIND) == IP_FW_F_ICMP) { + if (rule.fw_prot == IPPROTO_ICMP) { if (ac > 1 && !strncmp(*av,"icmptypes",strlen(*av))) { av++; ac--; fill_icmptypes(rule.fw_icmptypes, av, &rule.fw_flg); av++; ac--; continue; } } - if ((rule.fw_flg & IP_FW_F_KIND) == IP_FW_F_ALL) { - if (ac > 1 && !strncmp(*av,"proto",strlen(*av))) { - av++; ac--; - fill_port(&rule.fw_nsp, &rule.fw_pts, 0, *av, 1); - av++; ac--; continue; - } - } printf("%d %s\n",ac,*av); show_usage("Unknown argument\n"); } |