/* $OpenBSD: print-icmp.c,v 1.4 1996/07/13 11:01:23 mickey Exp $ */ /* * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint static char rcsid[] = "@(#) Header: print-icmp.c,v 1.27 96/06/24 22:14:23 leres Exp (LBL)"; #endif #include #include #include #include #if __STDC__ struct mbuf; struct rtentry; #endif #include #include #include #include #include #include #include #include #include #include #include #include #include "interface.h" #include "addrtoname.h" /* Compatibility */ #ifndef ICMP_UNREACH_NET_UNKNOWN #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */ #endif #ifndef ICMP_UNREACH_HOST_UNKNOWN #define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */ #endif #ifndef ICMP_UNREACH_ISOLATED #define ICMP_UNREACH_ISOLATED 8 /* source host isolated */ #endif #ifndef ICMP_UNREACH_NET_PROHIB #define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */ #endif #ifndef ICMP_UNREACH_HOST_PROHIB #define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */ #endif #ifndef ICMP_UNREACH_TOSNET #define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */ #endif #ifndef ICMP_UNREACH_TOSHOST #define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */ #endif /* Most of the icmp types */ static struct tok icmp2str[] = { { ICMP_ECHOREPLY, "echo reply" }, { ICMP_SOURCEQUENCH, "source quench" }, { ICMP_ECHO, "echo request" }, { ICMP_TSTAMP, "time stamp request" }, { ICMP_TSTAMPREPLY, "time stamp reply" }, { ICMP_IREQ, "information request" }, { ICMP_IREQREPLY, "information reply" }, { ICMP_MASKREQ, "address mask request" }, { 0, NULL } }; /* Formats for most of the ICMP_UNREACH codes */ static struct tok unreach2str[] = { { ICMP_UNREACH_NET, "net %s unreachable" }, { ICMP_UNREACH_HOST, "host %s unreachable" }, { ICMP_UNREACH_NEEDFRAG, "%s unreachable - need to frag" }, { ICMP_UNREACH_SRCFAIL, "%s unreachable - source route failed" }, { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" }, { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" }, { ICMP_UNREACH_ISOLATED, "%s unreachable - source host isolated" }, { ICMP_UNREACH_NET_PROHIB, "net %s unreachable - admin prohibited" }, { ICMP_UNREACH_HOST_PROHIB, "host %s unreachable - admin prohibited" }, { ICMP_UNREACH_TOSNET, "net %s unreachable - tos prohibited" }, { ICMP_UNREACH_TOSHOST, "host %s unreachable - tos prohibited" }, { 0, NULL } }; /* Formats for the ICMP_REDIRECT codes */ static struct tok type2str[] = { { ICMP_REDIRECT_NET, "redirect %s to net %s" }, { ICMP_REDIRECT_HOST, "redirect %s to host %s" }, { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" }, { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to net %s" }, { 0, NULL } }; void icmp_print(register const u_char *bp, register const u_char *bp2) { register const struct icmp *dp; register const struct ip *ip; register const char *str, *fmt; register const struct ip *oip; register const struct udphdr *ouh; register int hlen, dport; char buf[256]; #define TCHECK(var, l) if ((u_char *)&(var) > snapend - l) goto trunc dp = (struct icmp *)bp; ip = (struct ip *)bp2; str = buf; (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst)); TCHECK(dp->icmp_code, sizeof(dp->icmp_code)); switch (dp->icmp_type) { case ICMP_UNREACH: TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst)); switch (dp->icmp_code) { case ICMP_UNREACH_PROTOCOL: TCHECK(dp->icmp_ip.ip_p, sizeof(dp->icmp_ip.ip_p)); (void)sprintf(buf, "%s protocol %d unreachable", ipaddr_string(&dp->icmp_ip.ip_dst), dp->icmp_ip.ip_p); break; case ICMP_UNREACH_PORT: TCHECK(dp->icmp_ip.ip_p, sizeof(dp->icmp_ip.ip_p)); oip = &dp->icmp_ip; hlen = oip->ip_hl * 4; ouh = (struct udphdr *)(((u_char *)oip) + hlen); dport = ntohs(ouh->uh_dport); switch (oip->ip_p) { case IPPROTO_TCP: (void)sprintf(buf, "%s tcp port %s unreachable", ipaddr_string(&oip->ip_dst), tcpport_string(dport)); break; case IPPROTO_UDP: (void)sprintf(buf, "%s udp port %s unreachable", ipaddr_string(&oip->ip_dst), udpport_string(dport)); break; default: (void)sprintf(buf, "%s protocol %d port %d unreachable", ipaddr_string(&oip->ip_dst), oip->ip_p, dport); break; } break; default: fmt = tok2str(unreach2str, "#%d %%s unreachable", dp->icmp_code); (void)sprintf(buf, fmt, ipaddr_string(&dp->icmp_ip.ip_dst)); break; } break; case ICMP_REDIRECT: TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst)); fmt = tok2str(type2str, "redirect-#%d %%s to net %%s", dp->icmp_code); (void)sprintf(buf, fmt, ipaddr_string(&dp->icmp_ip.ip_dst), ipaddr_string(&dp->icmp_gwaddr)); break; case ICMP_TIMXCEED: TCHECK(dp->icmp_ip.ip_dst, sizeof(dp->icmp_ip.ip_dst)); switch (dp->icmp_code) { case ICMP_TIMXCEED_INTRANS: str = "time exceeded in-transit"; break; case ICMP_TIMXCEED_REASS: str = "ip reassembly time exceeded"; break; default: (void)sprintf(buf, "time exceeded-#%d", dp->icmp_code); break; } break; case ICMP_PARAMPROB: if (dp->icmp_code) (void)sprintf(buf, "parameter problem - code %d", dp->icmp_code); else { TCHECK(dp->icmp_pptr, sizeof(dp->icmp_pptr)); (void)sprintf(buf, "parameter problem - octet %d", dp->icmp_pptr); } break; case ICMP_MASKREPLY: TCHECK(dp->icmp_mask, sizeof(dp->icmp_mask)); (void)sprintf(buf, "address mask is 0x%08x", (u_int32_t)ntohl(dp->icmp_mask)); break; default: str = tok2str(icmp2str, "type-#%d", dp->icmp_type); break; } (void)printf("icmp: %s", str); return; trunc: fputs("[|icmp]", stdout); #undef TCHECK }