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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 17:13:01 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 17:13:01 +0000 |
commit | 7adcb5b605cc1328a3084c334f4697ec9771936c (patch) | |
tree | 03e681bfda053978ba896745828e09cb056ad156 /print-sl.c | |
parent | Initial commit. (diff) | |
download | tcpdump-7adcb5b605cc1328a3084c334f4697ec9771936c.tar.xz tcpdump-7adcb5b605cc1328a3084c334f4697ec9771936c.zip |
Adding upstream version 4.99.4.upstream/4.99.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | print-sl.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/print-sl.c b/print-sl.c new file mode 100644 index 0000000..85b7624 --- /dev/null +++ b/print-sl.c @@ -0,0 +1,259 @@ +/* + * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997 + * 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. + */ + +/* \summary: Compressed Serial Line Internet Protocol printer */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "netdissect-stdinc.h" + +#define ND_LONGJMP_FROM_TCHECK +#include "netdissect.h" +#include "extract.h" + +#include "ip.h" +#include "tcp.h" +#include "slcompress.h" + +/* + * definitions of the pseudo- link-level header attached to slip + * packets grabbed by the packet filter (bpf) traffic monitor. + */ +#define SLIP_HDRLEN 16 + +#define SLX_DIR 0 +#define SLX_CHDR 1 + +#define SLIPDIR_IN 0 +#define SLIPDIR_OUT 1 + + +static u_int lastlen[2][256]; +static u_int lastconn = 255; + +static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int); +static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int); + +void +sl_if_print(netdissect_options *ndo, + const struct pcap_pkthdr *h, const u_char *p) +{ + u_int length = h->len; + const struct ip *ip; + + ndo->ndo_protocol = "slip"; + ND_TCHECK_LEN(p, SLIP_HDRLEN); + ndo->ndo_ll_hdr_len += SLIP_HDRLEN; + + length -= SLIP_HDRLEN; + + ip = (const struct ip *)(p + SLIP_HDRLEN); + + if (ndo->ndo_eflag) + sliplink_print(ndo, p, ip, length); + + switch (IP_V(ip)) { + case 4: + ip_print(ndo, (const u_char *)ip, length); + break; + case 6: + ip6_print(ndo, (const u_char *)ip, length); + break; + default: + ND_PRINT("ip v%u", IP_V(ip)); + } +} + +void +sl_bsdos_if_print(netdissect_options *ndo, + const struct pcap_pkthdr *h, const u_char *p) +{ + u_int length = h->len; + const struct ip *ip; + + ndo->ndo_protocol = "slip_bsdos"; + ND_TCHECK_LEN(p, SLIP_HDRLEN); + ndo->ndo_ll_hdr_len += SLIP_HDRLEN; + + length -= SLIP_HDRLEN; + + ip = (const struct ip *)(p + SLIP_HDRLEN); + +#ifdef notdef + if (ndo->ndo_eflag) + sliplink_print(ndo, p, ip, length); +#endif + + ip_print(ndo, (const u_char *)ip, length); +} + +static void +sliplink_print(netdissect_options *ndo, + const u_char *p, const struct ip *ip, + u_int length) +{ + int dir; + u_int hlen; + + dir = GET_U_1(p + SLX_DIR); + switch (dir) { + + case SLIPDIR_IN: + ND_PRINT("I "); + break; + + case SLIPDIR_OUT: + ND_PRINT("O "); + break; + + default: + ND_PRINT("Invalid direction %d ", dir); + dir = -1; + break; + } + switch (GET_U_1(p + SLX_CHDR) & 0xf0) { + + case TYPE_IP: + ND_PRINT("ip %u: ", length + SLIP_HDRLEN); + break; + + case TYPE_UNCOMPRESSED_TCP: + /* + * The connection id is stored in the IP protocol field. + * Get it from the link layer since sl_uncompress_tcp() + * has restored the IP header copy to IPPROTO_TCP. + */ + lastconn = GET_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p); + ND_PRINT("utcp %u: ", lastconn); + if (dir == -1) { + /* Direction is bogus, don't use it */ + return; + } + ND_TCHECK_SIZE(ip); + hlen = IP_HL(ip); + ND_TCHECK_SIZE((const struct tcphdr *)&((const int *)ip)[hlen]); + hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]); + lastlen[dir][lastconn] = length - (hlen << 2); + break; + + default: + if (dir == -1) { + /* Direction is bogus, don't use it */ + return; + } + if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) { + compressed_sl_print(ndo, p + SLX_CHDR, ip, length, dir); + ND_PRINT(": "); + } else + ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR)); + } +} + +static const u_char * +print_sl_change(netdissect_options *ndo, + const char *str, const u_char *cp) +{ + u_int i; + + if ((i = GET_U_1(cp)) == 0) { + cp++; + i = GET_BE_U_2(cp); + cp += 2; + } + ND_PRINT(" %s%u", str, i); + return (cp); +} + +static const u_char * +print_sl_winchange(netdissect_options *ndo, + const u_char *cp) +{ + int16_t i; + + if ((i = GET_U_1(cp)) == 0) { + cp++; + i = GET_BE_S_2(cp); + cp += 2; + } + if (i >= 0) + ND_PRINT(" W+%d", i); + else + ND_PRINT(" W%d", i); + return (cp); +} + +static void +compressed_sl_print(netdissect_options *ndo, + const u_char *chdr, const struct ip *ip, + u_int length, int dir) +{ + const u_char *cp = chdr; + u_int flags, hlen; + + flags = GET_U_1(cp); + cp++; + if (flags & NEW_C) { + lastconn = GET_U_1(cp); + cp++; + ND_PRINT("ctcp %u", lastconn); + } else + ND_PRINT("ctcp *"); + + /* skip tcp checksum */ + cp += 2; + + switch (flags & SPECIALS_MASK) { + case SPECIAL_I: + ND_PRINT(" *SA+%u", lastlen[dir][lastconn]); + break; + + case SPECIAL_D: + ND_PRINT(" *S+%u", lastlen[dir][lastconn]); + break; + + default: + if (flags & NEW_U) + cp = print_sl_change(ndo, "U=", cp); + if (flags & NEW_W) + cp = print_sl_winchange(ndo, cp); + if (flags & NEW_A) + cp = print_sl_change(ndo, "A+", cp); + if (flags & NEW_S) + cp = print_sl_change(ndo, "S+", cp); + break; + } + if (flags & NEW_I) + cp = print_sl_change(ndo, "I+", cp); + + /* + * 'hlen' is the length of the uncompressed TCP/IP header (in words). + * 'cp - chdr' is the length of the compressed header. + * 'length - hlen' is the amount of data in the packet. + */ + ND_TCHECK_SIZE(ip); + hlen = IP_HL(ip); + ND_TCHECK_SIZE((const struct tcphdr *)&((const int32_t *)ip)[hlen]); + hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]); + lastlen[dir][lastconn] = length - (hlen << 2); + ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)); +} |