1 /* $OpenBSD: print-pflog.c,v 1.31 2017/05/24 16:20:26 bluhm Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #include <sys/param.h> /* MAXCOMLEN */ 25 #include <sys/time.h> 26 #include <sys/socket.h> 27 #include <sys/file.h> 28 #include <sys/ioctl.h> 29 #include <sys/queue.h> 30 #include <sys/mbuf.h> 31 32 #ifndef NO_PID 33 #define NO_PID (99999+1) 34 #endif 35 36 struct rtentry; 37 38 #include <netinet/in.h> 39 #include <netinet/ip.h> 40 #include <net/if.h> 41 #include <net/pfvar.h> 42 #include <net/if_pflog.h> 43 44 #include <arpa/inet.h> 45 46 #include <ctype.h> 47 #include <netdb.h> 48 #include <pcap.h> 49 #include <signal.h> 50 #include <stdio.h> 51 52 #include "interface.h" 53 #include "addrtoname.h" 54 55 char *pf_reasons[PFRES_MAX+2] = PFRES_NAMES; 56 57 void 58 pflog_if_print(u_char *user, const struct pcap_pkthdr *h, 59 const u_char *p) 60 { 61 u_int length = h->len; 62 u_int hdrlen; 63 u_int caplen = h->caplen; 64 const struct ip *ip; 65 #ifdef INET6 66 const struct ip6_hdr *ip6; 67 #endif 68 const struct pfloghdr *hdr; 69 u_int8_t af; 70 71 ts_print(&h->ts); 72 73 /* check length */ 74 if (caplen < sizeof(u_int8_t)) { 75 printf("[|pflog]"); 76 goto out; 77 } 78 79 #define MIN_PFLOG_HDRLEN 45 80 hdr = (struct pfloghdr *)p; 81 if (hdr->length < MIN_PFLOG_HDRLEN) { 82 printf("[pflog: invalid header length!]"); 83 goto out; 84 } 85 hdrlen = (hdr->length + 3) & 0xfc; 86 87 if (caplen < hdrlen) { 88 printf("[|pflog]"); 89 goto out; 90 } 91 92 /* 93 * Some printers want to get back at the link level addresses, 94 * and/or check that they're not walking off the end of the packet. 95 * Rather than pass them all the way down, we set these globals. 96 */ 97 packetp = p; 98 snapend = p + caplen; 99 100 hdr = (struct pfloghdr *)p; 101 if (eflag) { 102 printf("rule "); 103 if (ntohl(hdr->rulenr) == (u_int32_t) -1) 104 printf("def"); 105 else { 106 printf("%u", ntohl(hdr->rulenr)); 107 if (hdr->ruleset[0]) { 108 printf(".%s", hdr->ruleset); 109 if (ntohl(hdr->subrulenr) == (u_int32_t) -1) 110 printf(".def"); 111 else 112 printf(".%u", ntohl(hdr->subrulenr)); 113 } 114 } 115 if (hdr->reason < PFRES_MAX) 116 printf("/(%s) ", pf_reasons[hdr->reason]); 117 else 118 printf("/(unkn %u) ", (unsigned)hdr->reason); 119 if (vflag) 120 printf("[uid %u, pid %u] ", (unsigned)hdr->rule_uid, 121 (unsigned)hdr->rule_pid); 122 123 switch (hdr->action) { 124 case PF_MATCH: 125 printf("match"); 126 break; 127 case PF_SCRUB: 128 printf("scrub"); 129 break; 130 case PF_PASS: 131 printf("pass"); 132 break; 133 case PF_DROP: 134 printf("block"); 135 break; 136 case PF_NAT: 137 case PF_NONAT: 138 printf("nat"); 139 break; 140 case PF_BINAT: 141 case PF_NOBINAT: 142 printf("binat"); 143 break; 144 case PF_RDR: 145 case PF_NORDR: 146 printf("rdr"); 147 break; 148 } 149 printf(" %s on %s: ", 150 hdr->dir == PF_OUT ? "out" : "in", 151 hdr->ifname); 152 if (vflag && hdr->pid != NO_PID) 153 printf("[uid %u, pid %u] ", (unsigned)hdr->uid, 154 (unsigned)hdr->pid); 155 if (vflag && hdr->rewritten) { 156 char buf[48]; 157 158 if (inet_ntop(hdr->af, &hdr->saddr.v4, buf, 159 sizeof(buf)) == NULL) 160 printf("[orig src ?, "); 161 else 162 printf("[orig src %s:%u, ", buf, 163 ntohs(hdr->sport)); 164 if (inet_ntop(hdr->af, &hdr->daddr.v4, buf, 165 sizeof(buf)) == NULL) 166 printf("dst ?] "); 167 else 168 printf("dst %s:%u] ", buf, 169 ntohs(hdr->dport)); 170 } 171 } 172 af = hdr->naf; 173 length -= hdrlen; 174 if (af == AF_INET) { 175 ip = (struct ip *)(p + hdrlen); 176 ip_print((const u_char *)ip, length); 177 if (xflag) 178 default_print((const u_char *)ip, 179 caplen - hdrlen); 180 } else { 181 #ifdef INET6 182 ip6 = (struct ip6_hdr *)(p + hdrlen); 183 ip6_print((const u_char *)ip6, length); 184 if (xflag) 185 default_print((const u_char *)ip6, 186 caplen - hdrlen); 187 #endif 188 } 189 190 out: 191 putchar('\n'); 192 } 193