X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/4fe64c9d253007f06b52c6d8be2c99bfc28f989b..refs/heads/tcpdump-4.0:/print-fr.c diff --git a/print-fr.c b/print-fr.c index e651ff28..f71aee66 100644 --- a/print-fr.c +++ b/print-fr.c @@ -21,7 +21,7 @@ #ifndef lint static const char rcsid[] _U_ = - "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.43 2005-07-27 00:25:58 guy Exp $ (LBL)"; + "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.51 2006-06-23 22:20:32 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -82,11 +82,25 @@ struct tok fr_header_flag_values[] = { { 0, NULL } }; +/* FRF.15 / FRF.16 */ +#define MFR_B_BIT 0x80 +#define MFR_E_BIT 0x40 +#define MFR_C_BIT 0x20 +#define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) +#define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) +#define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) + +struct tok frf_flag_values[] = { + { MFR_B_BIT, "Begin" }, + { MFR_E_BIT, "End" }, + { MFR_C_BIT, "Control" }, + { 0, NULL } +}; /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success * save the flags dep. on address length */ -static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore, +static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *addr_len, u_int8_t *flags) { if ((p[0] & FR_EA_BIT)) @@ -97,6 +111,8 @@ static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore, flags[0] = p[0] & 0x02; /* populate the first flag fields */ flags[1] = p[1] & 0x0c; + flags[2] = 0; /* clear the rest of the flags */ + flags[3] = 0; if (p[1] & FR_EA_BIT) return 0; /* 2-byte Q.922 address */ @@ -114,14 +130,26 @@ static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore, flags[3] = p[0] & 0x02; - if (p[0] & 0x02) - *sdlcore = p[0] >> 2; - else - *dlci = (*dlci << 6) | (p[0] >> 2); + *dlci = (*dlci << 6) | (p[0] >> 2); return 0; } +char *q922_string(const u_char *p) { + + static u_int dlci, addr_len; + static u_int8_t flags[4]; + static char buffer[sizeof("DLCI xxxxxxxxxx")]; + memset(buffer, 0, sizeof(buffer)); + + if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){ + snprintf(buffer, sizeof(buffer), "DLCI %u", dlci); + } + + return buffer; +} + + /* Frame Relay packet structure, with flags and CRC removed +---------------------------+ @@ -206,13 +234,12 @@ fr_print(register const u_char *p, u_int length) { u_int16_t extracted_ethertype; u_int dlci; - u_int sdlcore; u_int addr_len; u_int16_t nlpid; u_int hdr_len; u_int8_t flags[4]; - if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) { + if (parse_q922_addr(p, &dlci, &addr_len, flags)) { printf("Q.922, invalid address"); return 0; } @@ -288,6 +315,10 @@ fr_print(register const u_char *p, u_int length) frf15_print(p, length); break; + case NLPID_PPP: + ppp_print(p, length); + break; + default: if (!eflag) fr_hdr_print(length + hdr_len, addr_len, @@ -304,12 +335,23 @@ fr_print(register const u_char *p, u_int length) } -#define MFR_B_BIT 0x80 -#define MFR_E_BIT 0x40 -#define MFR_C_BIT 0x20 -#define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) -#define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) -#define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) +u_int +mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p) +{ + register u_int length = h->len; + register u_int caplen = h->caplen; + + TCHECK2(*p, 2); /* minimum frame header length */ + + if ((length = mfr_print(p, length)) == 0) + return (0); + else + return length; + trunc: + printf("[|mfr]"); + return caplen; +} + #define MFR_CTRL_MSG_ADD_LINK 1 #define MFR_CTRL_MSG_ADD_LINK_ACK 2 @@ -379,7 +421,8 @@ mfr_print(register const u_char *p, u_int length) TCHECK2(*p, 4); /* minimum frame header length */ if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { - printf("FRF.16 Control, %s, length %u", + printf("FRF.16 Control, Flags [%s], %s, length %u", + bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)), tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]), length); tptr = p + 3; @@ -470,14 +513,24 @@ mfr_print(register const u_char *p, u_int length) * +----+----+----+----+----+----+----+----+ */ - if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME) { - sequence_num = (p[0]&0x1e)<<7 | p[1]; - if (eflag) - printf("FRF.16 Frag, seq %u, ", sequence_num); + sequence_num = (p[0]&0x1e)<<7 | p[1]; + /* whole packet or first fragment ? */ + if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME || + (p[0] & MFR_BEC_MASK) == MFR_B_BIT) { + printf("FRF.16 Frag, seq %u, Flags [%s], ", + sequence_num, + bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); hdr_len = 2; fr_print(p+hdr_len,length-hdr_len); + return hdr_len; } + /* must be a middle or the last fragment */ + printf("FRF.16 Frag, seq %u, Flags [%s]", + sequence_num, + bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); + print_unknown_data(p,"\n\t",length); + return hdr_len; trunc: @@ -500,13 +553,6 @@ mfr_print(register const u_char *p, u_int length) * +----+----+----+----+----+----+----+----+ */ -struct tok frf15_flag_values[] = { - { 0x80, "Begin" }, - { 0x40, "End" }, - { 0x20, "Control" }, - { 0, NULL } -}; - #define FR_FRF15_FRAGTYPE 0x01 static void @@ -514,13 +560,13 @@ frf15_print (const u_char *p, u_int length) { u_int16_t sequence_num, flags; - flags = p[0]&0xe0; + flags = p[0]&MFR_BEC_MASK; sequence_num = (p[0]&0x1e)<<7 | p[1]; printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", sequence_num, - bittok2str(frf15_flag_values,"none",flags), - flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", + bittok2str(frf_flag_values,"none",flags), + p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", length); /* TODO: @@ -695,25 +741,29 @@ q933_print(const u_char *p, u_int length) codeset = p[2]&0x0f; /* extract the codeset */ - if (p[2] == MSG_ANSI_LOCKING_SHIFT) - is_ansi = 1; + if (p[2] == MSG_ANSI_LOCKING_SHIFT) { + is_ansi = 1; + } printf("%s", eflag ? "" : "Q.933, "); /* printing out header part */ printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); - if (p[0]) - printf(", Call Ref: 0x%02x", p[0]); - - if (vflag) - printf(", %s (0x%02x), length %u", - tok2str(fr_q933_msg_values,"unknown message",p[1]), - p[1], - length); - else - printf(", %s", - tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1])); + if (p[0]) { + printf(", Call Ref: 0x%02x", p[0]); + } + if (vflag) { + printf(", %s (0x%02x), length %u", + tok2str(fr_q933_msg_values, + "unknown message", p[1]), + p[1], + length); + } else { + printf(", %s", + tok2str(fr_q933_msg_values, + "unknown message 0x%02x", p[1])); + } olen = length; /* preserve the original length for non verbose mode */ @@ -721,49 +771,57 @@ q933_print(const u_char *p, u_int length) printf("[|q.933]"); return; } - length -= 2 - is_ansi; + length -= 2 + is_ansi; ptemp += 2 + is_ansi; /* Loop through the rest of IE */ - while (length > sizeof(struct ie_tlv_header_t )) { + while (length > sizeof(struct ie_tlv_header_t)) { ie_p = (struct ie_tlv_header_t *)ptemp; - if (length < sizeof(struct ie_tlv_header_t ) || - length < sizeof(struct ie_tlv_header_t ) + ie_p->ie_len) { - if (vflag) /* not bark if there is just a trailer */ + if (length < sizeof(struct ie_tlv_header_t) || + length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) { + if (vflag) { /* not bark if there is just a trailer */ printf("\n[|q.933]"); - else + } else { printf(", length %u",olen); + } return; } /* lets do the full IE parsing only in verbose mode * however some IEs (DLCI Status, Link Verify) - * are also intereststing in non-verbose mode */ - if (vflag) + * are also interestting in non-verbose mode */ + if (vflag) { printf("\n\t%s IE (0x%02x), length %u: ", - tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_type), + tok2str(fr_q933_ie_codesets[codeset], + "unknown", ie_p->ie_type), ie_p->ie_type, ie_p->ie_len); - + } + /* sanity check */ - if (ie_p->ie_type == 0 || ie_p->ie_len == 0) + if (ie_p->ie_type == 0 || ie_p->ie_len == 0) { return; + } - if (fr_q933_print_ie_codeset[codeset] != NULL) + if (fr_q933_print_ie_codeset[codeset] != NULL) { ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp); - - if (vflag >= 1 && !ie_is_known) + } + + if (vflag >= 1 && !ie_is_known) { print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); + } /* do we want to see a hexdump of the IE ? */ - if (vflag> 1 && ie_is_known) + if (vflag> 1 && ie_is_known) { print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); + } length = length - ie_p->ie_len - 2; ptemp = ptemp + ie_p->ie_len + 2; } - if (!vflag) + if (!vflag) { printf(", length %u",olen); + } } static int @@ -775,24 +833,27 @@ fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p) case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ case FR_LMI_CCITT_REPORT_TYPE_IE: - if (vflag) + if (vflag) { printf("%s (%u)", tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]), p[2]); + } return 1; case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ case FR_LMI_CCITT_LINK_VERIFY_IE: case FR_LMI_ANSI_LINK_VERIFY_IE_91: - if (!vflag) + if (!vflag) { printf(", "); + } printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]); return 1; case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ case FR_LMI_CCITT_PVC_STATUS_IE: - if (!vflag) + if (!vflag) { printf(", "); + } /* now parse the DLCI information element. */ if ((ie_p->ie_len < 3) || (p[2] & 0x80) || @@ -801,14 +862,17 @@ fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p) ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) || !(p[5] & 0x80))) || (ie_p->ie_len > 5) || - !(p[ie_p->ie_len + 1] & 0x80)) + !(p[ie_p->ie_len + 1] & 0x80)) { printf("Invalid DLCI IE"); + } dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3); - if (ie_p->ie_len == 4) + if (ie_p->ie_len == 4) { dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1); - else if (ie_p->ie_len == 5) + } + else if (ie_p->ie_len == 5) { dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1); + } printf("DLCI %u: status %s%s", dlci, p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",