* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: Frame Relay printer */
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "llc.h"
* 0 on invalid address, -1 on truncated packet
* save the flags dep. on address length
*/
-static int parse_q922_addr(netdissect_options *ndo,
+static int parse_q922_header(netdissect_options *ndo,
const u_char *p, u_int *dlci,
- u_int *addr_len, uint8_t *flags, u_int length)
+ u_int *addr_len, uint32_t *flags, u_int length)
{
- if (!ND_TTEST(p[0]) || length < 1)
+ if (!ND_TTEST_1(p) || length < 1)
return -1;
- if ((p[0] & FR_EA_BIT))
+ if ((GET_U_1(p) & FR_EA_BIT))
return 0;
- if (!ND_TTEST(p[1]) || length < 2)
+ if (!ND_TTEST_1(p + 1) || length < 2)
return -1;
*addr_len = 2;
- *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
+ *dlci = ((GET_U_1(p) & 0xFC) << 2) | ((GET_U_1(p + 1) & 0xF0) >> 4);
- 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;
+ *flags = ((GET_U_1(p) & 0x02) << 24) | /* CR flag */
+ ((GET_U_1(p + 1) & 0x0e) << 16); /* FECN,BECN,DE flags */
- if (p[1] & FR_EA_BIT)
+ if (GET_U_1(p + 1) & FR_EA_BIT)
return 1; /* 2-byte Q.922 address */
p += 2;
length -= 2;
- if (!ND_TTEST(p[0]) || length < 1)
+ if (!ND_TTEST_1(p) || length < 1)
return -1;
(*addr_len)++; /* 3- or 4-byte Q.922 address */
- if ((p[0] & FR_EA_BIT) == 0) {
- *dlci = (*dlci << 7) | (p[0] >> 1);
+ if ((GET_U_1(p) & FR_EA_BIT) == 0) {
+ *dlci = (*dlci << 7) | (GET_U_1(p) >> 1);
(*addr_len)++; /* 4-byte Q.922 address */
p++;
length--;
}
- if (!ND_TTEST(p[0]) || length < 1)
+ if (!ND_TTEST_1(p) || length < 1)
return -1;
- if ((p[0] & FR_EA_BIT) == 0)
+ if ((GET_U_1(p) & FR_EA_BIT) == 0)
return 0; /* more than 4 bytes of Q.922 address? */
- flags[3] = p[0] & 0x02;
+ *flags = *flags | (GET_U_1(p) & 0x02); /* SDLC flag */
- *dlci = (*dlci << 6) | (p[0] >> 2);
+ *dlci = (*dlci << 6) | (GET_U_1(p) >> 2);
return 1;
}
-char *
+const char *
q922_string(netdissect_options *ndo, const u_char *p, u_int length)
{
static u_int dlci, addr_len;
- static uint8_t flags[4];
+ static uint32_t flags;
static char buffer[sizeof("DLCI xxxxxxxxxx")];
memset(buffer, 0, sizeof(buffer));
- if (parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length) == 1){
+ if (parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length) == 1){
snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
}
*/
static void
-fr_hdr_print(netdissect_options *ndo,
- int length, u_int addr_len, u_int dlci, uint8_t *flags, uint16_t nlpid)
+fr_hdr_print(netdissect_options *ndo, int length, u_int addr_len,
+ u_int dlci, uint32_t flags, uint16_t nlpid)
{
if (ndo->ndo_qflag) {
- ND_PRINT((ndo, "Q.922, DLCI %u, length %u: ",
+ ND_PRINT("Q.922, DLCI %u, length %u: ",
dlci,
- length));
+ length);
} else {
if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
- ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
+ ND_PRINT("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
addr_len,
dlci,
- bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
+ bittok2str(fr_header_flag_values, "none", flags),
tok2str(nlpid_values,"unknown", nlpid),
nlpid,
- length));
+ length);
else /* must be an ethertype */
- ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
+ ND_PRINT("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
addr_len,
dlci,
- bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
+ bittok2str(fr_header_flag_values, "none", flags),
tok2str(ethertype_values, "unknown", nlpid),
nlpid,
- length));
+ length);
}
}
u_int
fr_if_print(netdissect_options *ndo,
- const struct pcap_pkthdr *h, register const u_char *p)
+ const struct pcap_pkthdr *h, const u_char *p)
{
- register u_int length = h->len;
- register u_int caplen = h->caplen;
+ u_int length = h->len;
+ u_int caplen = h->caplen;
- ND_TCHECK2(*p, 4); /* minimum frame header length */
+ ndo->ndo_protocol = "fr_if";
+ ND_TCHECK_4(p); /* minimum frame header length */
if ((length = fr_print(ndo, p, length)) == 0)
return (0);
else
return length;
- trunc:
- ND_PRINT((ndo, "[|fr]"));
+trunc:
+ nd_print_trunc(ndo);
return caplen;
}
u_int
fr_print(netdissect_options *ndo,
- register const u_char *p, u_int length)
+ const u_char *p, u_int length)
{
int ret;
uint16_t extracted_ethertype;
u_int addr_len;
uint16_t nlpid;
u_int hdr_len;
- uint8_t flags[4];
+ uint32_t flags;
- ret = parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length);
+ ndo->ndo_protocol = "fr";
+ ret = parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length);
if (ret == -1)
goto trunc;
if (ret == 0) {
- ND_PRINT((ndo, "Q.922, invalid address"));
+ ND_PRINT("Q.922, invalid address");
return 0;
}
- ND_TCHECK(p[addr_len]);
+ ND_TCHECK_1(p + addr_len);
if (length < addr_len + 1)
goto trunc;
- if (p[addr_len] != LLC_UI && dlci != 0) {
+ if (GET_U_1(p + addr_len) != LLC_UI && dlci != 0) {
/*
* Let's figure out if we have Cisco-style encapsulation,
* with an Ethernet type (Cisco HDLC type?) following the
* address.
*/
- if (!ND_TTEST2(p[addr_len], 2) || length < addr_len + 2) {
+ if (!ND_TTEST_2(p + addr_len) || length < addr_len + 2) {
/* no Ethertype */
- ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
+ ND_PRINT("UI %02x! ", GET_U_1(p + addr_len));
} else {
- extracted_ethertype = EXTRACT_16BITS(p+addr_len);
+ extracted_ethertype = GET_BE_U_2(p + addr_len);
if (ndo->ndo_eflag)
fr_hdr_print(ndo, length, addr_len, dlci,
if (ethertype_print(ndo, extracted_ethertype,
p+addr_len+ETHERTYPE_LEN,
length-addr_len-ETHERTYPE_LEN,
- length-addr_len-ETHERTYPE_LEN) == 0)
+ ND_BYTES_AVAILABLE_AFTER(p)-addr_len-ETHERTYPE_LEN,
+ NULL, NULL) == 0)
/* ether_type not known, probably it wasn't one */
- ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
+ ND_PRINT("UI %02x! ", GET_U_1(p + addr_len));
else
return addr_len + 2;
}
}
- ND_TCHECK(p[addr_len+1]);
+ ND_TCHECK_1(p + addr_len + 1);
if (length < addr_len + 2)
goto trunc;
- if (p[addr_len + 1] == 0) {
+ if (GET_U_1(p + addr_len + 1) == 0) {
/*
* Assume a pad byte after the control (UI) byte.
* A pad byte should only be used with 3-byte Q.922.
*/
if (addr_len != 3)
- ND_PRINT((ndo, "Pad! "));
+ ND_PRINT("Pad! ");
hdr_len = addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
} else {
/*
* A pad byte should be used with 3-byte Q.922.
*/
if (addr_len == 3)
- ND_PRINT((ndo, "No pad! "));
+ ND_PRINT("No pad! ");
hdr_len = addr_len + 1 /* UI */ + 1 /* NLPID */;
}
- ND_TCHECK(p[hdr_len - 1]);
+ ND_TCHECK_1(p + hdr_len - 1);
if (length < hdr_len)
goto trunc;
- nlpid = p[hdr_len - 1];
+ nlpid = GET_U_1(p + hdr_len - 1);
if (ndo->ndo_eflag)
fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid);
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
- isoclns_print(ndo, p - 1, length + 1, length + 1); /* OSI printers need the NLPID field */
+ isoclns_print(ndo, p - 1, length + 1); /* OSI printers need the NLPID field */
break;
case NLPID_SNAP:
- if (snap_print(ndo, p, length, length, NULL, NULL, 0) == 0) {
+ if (snap_print(ndo, p, length, ND_BYTES_AVAILABLE_AFTER(p), NULL, NULL, 0) == 0) {
/* ether_type not known, print raw packet */
if (!ndo->ndo_eflag)
fr_hdr_print(ndo, length + hdr_len, hdr_len,
return hdr_len;
- trunc:
- ND_PRINT((ndo, "[|fr]"));
+trunc:
+ nd_print_trunc(ndo);
return 0;
}
u_int
mfr_if_print(netdissect_options *ndo,
- const struct pcap_pkthdr *h, register const u_char *p)
+ const struct pcap_pkthdr *h, const u_char *p)
{
- register u_int length = h->len;
- register u_int caplen = h->caplen;
+ u_int length = h->len;
+ u_int caplen = h->caplen;
- ND_TCHECK2(*p, 2); /* minimum frame header length */
+ ndo->ndo_protocol = "mfr_if";
+ ND_TCHECK_2(p); /* minimum frame header length */
if ((length = mfr_print(ndo, p, length)) == 0)
return (0);
else
return length;
- trunc:
- ND_PRINT((ndo, "[|mfr]"));
+trunc:
+ nd_print_trunc(ndo);
return caplen;
}
u_int
mfr_print(netdissect_options *ndo,
- register const u_char *p, u_int length)
+ const u_char *p, u_int length)
{
u_int tlen,idx,hdr_len = 0;
uint16_t sequence_num;
* +----+----+----+----+----+----+----+----+
*/
- ND_TCHECK2(*p, 4); /* minimum frame header length */
+ ndo->ndo_protocol = "mfr";
+
+ if (length < 4) { /* minimum frame header length */
+ ND_PRINT("[length %u < 4]", length);
+ nd_print_invalid(ndo);
+ return length;
+ }
+ ND_TCHECK_4(p);
- if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
- ND_PRINT((ndo, "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));
+ if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_CTRL_FRAME && GET_U_1(p + 1) == 0) {
+ ND_PRINT("FRF.16 Control, Flags [%s], %s, length %u",
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)),
+ tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",GET_U_1(p + 2)),
+ length);
tptr = p + 3;
tlen = length -3;
hdr_len = 3;
return hdr_len;
while (tlen>sizeof(struct ie_tlv_header_t)) {
- ND_TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
- ie_type=tptr[0];
- ie_len=tptr[1];
+ ND_TCHECK_LEN(tptr, sizeof(struct ie_tlv_header_t));
+ ie_type=GET_U_1(tptr);
+ ie_len=GET_U_1(tptr + 1);
- ND_PRINT((ndo, "\n\tIE %s (%u), length %u: ",
+ ND_PRINT("\n\tIE %s (%u), length %u: ",
tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
ie_type,
- ie_len));
+ ie_len);
/* infinite loop check */
if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
return hdr_len;
- ND_TCHECK2(*tptr, ie_len);
+ ND_TCHECK_LEN(tptr, ie_len);
tptr+=sizeof(struct ie_tlv_header_t);
/* tlv len includes header */
ie_len-=sizeof(struct ie_tlv_header_t);
switch (ie_type) {
case MFR_CTRL_IE_MAGIC_NUM:
- ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(tptr)));
+ /* FRF.16.1 Section 3.4.3 Magic Number Information Element */
+ if (ie_len != 4) {
+ ND_PRINT("[IE data length %d != 4]", ie_len);
+ nd_print_invalid(ndo);
+ break;
+ }
+ ND_PRINT("0x%08x", GET_BE_U_4(tptr));
break;
case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
case MFR_CTRL_IE_LINK_ID:
for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
- if (*(tptr+idx) != 0) /* don't print null termination */
- safeputchar(ndo, *(tptr + idx));
+ if (GET_U_1(tptr + idx) != 0) /* don't print null termination */
+ fn_print_char(ndo, GET_U_1(tptr + idx));
else
break;
}
break;
}
/* fall through and hexdump if no unix timestamp */
+ ND_FALL_THROUGH;
/*
* FIXME those are the defined IEs that lack a decoder
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
- * | B | E | C=0|seq. (high 4 bits) | EA |
+ * | B | E | C=0|seq. (high 4 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
- * | DLCI (6 bits) | CR | EA |
+ * | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+
*/
- sequence_num = (p[0]&0x1e)<<7 | p[1];
+ sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1);
/* whole packet or first fragment ? */
- if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
- (p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
- ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s], ",
+ if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
+ (GET_U_1(p) & MFR_BEC_MASK) == MFR_B_BIT) {
+ ND_PRINT("FRF.16 Frag, seq %u, Flags [%s], ",
sequence_num,
- bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)));
hdr_len = 2;
fr_print(ndo, p+hdr_len,length-hdr_len);
return hdr_len;
}
/* must be a middle or the last fragment */
- ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s]",
+ ND_PRINT("FRF.16 Frag, seq %u, Flags [%s]",
sequence_num,
- bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)));
print_unknown_data(ndo, p, "\n\t", length);
return hdr_len;
- trunc:
- ND_PRINT((ndo, "[|mfr]"));
+trunc:
+ nd_print_trunc(ndo);
return length;
}
{
uint16_t sequence_num, flags;
- flags = p[0]&MFR_BEC_MASK;
- sequence_num = (p[0]&0x1e)<<7 | p[1];
+ if (length < 2)
+ goto trunc;
+ ND_TCHECK_2(p);
- ND_PRINT((ndo, "FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
+ flags = GET_U_1(p)&MFR_BEC_MASK;
+ sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1);
+
+ ND_PRINT("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
sequence_num,
bittok2str(frf_flag_values,"none",flags),
- p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
- length));
+ GET_U_1(p)&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
+ length);
/* TODO:
* depending on all permutations of the B, E and C bit
* model is end-to-end or interface based wether we want to print
* another Q.922 header
*/
+ return;
+trunc:
+ nd_print_trunc(ndo);
}
/*
{ 0, NULL }
};
-#define MSG_ANSI_LOCKING_SHIFT 0x95
+#define IE_IS_SINGLE_OCTET(iecode) ((iecode) & 0x80)
+#define IE_IS_SHIFT(iecode) (((iecode) & 0xF0) == 0x90)
+#define IE_SHIFT_IS_NON_LOCKING(iecode) ((iecode) & 0x08)
+#define IE_SHIFT_IS_LOCKING(iecode) (!(IE_SHIFT_IS_NON_LOCKING(iecode)))
+#define IE_SHIFT_CODESET(iecode) ((iecode) & 0x07)
#define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
#define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
#define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
#define FR_LMI_CCITT_PVC_STATUS_IE 0x57
-static const struct tok fr_q933_ie_values_codeset5[] = {
+static const struct tok fr_q933_ie_values_codeset_0_5[] = {
{ FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
{ FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
{ FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
{ 0, NULL }
};
-/* array of 16 codepages - currently we only support codepage 1,5 */
+/* array of 16 codesets - currently we only support codepage 0 and 5 */
static const struct tok *fr_q933_ie_codesets[] = {
+ fr_q933_ie_values_codeset_0_5,
NULL,
- fr_q933_ie_values_codeset5,
NULL,
NULL,
NULL,
- fr_q933_ie_values_codeset5,
+ fr_q933_ie_values_codeset_0_5,
NULL,
NULL,
NULL,
NULL
};
-static int fr_q933_print_ie_codeset5(netdissect_options *ndo,
- const struct ie_tlv_header_t *ie_p, const u_char *p);
+static int fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
+ u_int ielength, const u_char *p);
-typedef int (*codeset_pr_func_t)(netdissect_options *,
- const struct ie_tlv_header_t *ie_p, const u_char *p);
+typedef int (*codeset_pr_func_t)(netdissect_options *, u_int iecode,
+ u_int ielength, const u_char *p);
-/* array of 16 codepages - currently we only support codepage 1,5 */
+/* array of 16 codesets - currently we only support codepage 0 and 5 */
static const codeset_pr_func_t fr_q933_print_ie_codeset[] = {
+ fr_q933_print_ie_codeset_0_5,
NULL,
- fr_q933_print_ie_codeset5,
NULL,
NULL,
NULL,
- fr_q933_print_ie_codeset5,
+ fr_q933_print_ie_codeset_0_5,
NULL,
NULL,
NULL,
NULL
};
+/*
+ * ITU-T Q.933.
+ *
+ * p points to octet 2, the octet containing the length of the
+ * call reference value, so p[n] is octet n+2 ("octet X" is as
+ * used in Q.931/Q.933).
+ *
+ * XXX - actually used both for Q.931 and Q.933.
+ */
void
q933_print(netdissect_options *ndo,
const u_char *p, u_int length)
{
- const u_char *ptemp = p;
- const struct ie_tlv_header_t *ie_p;
- int olen;
- int is_ansi = 0;
- u_int codeset;
- u_int ie_is_known = 0;
-
- if (length < 9) { /* shortest: Q.933a LINK VERIFY */
- ND_PRINT((ndo, "[|q.933]"));
- return;
- }
-
- codeset = p[2]&0x0f; /* extract the codeset */
-
- if (p[2] == MSG_ANSI_LOCKING_SHIFT) {
- is_ansi = 1;
+ u_int olen;
+ u_int call_ref_length, i;
+ uint8_t call_ref[15]; /* maximum length - length field is 4 bits */
+ u_int msgtype;
+ u_int iecode;
+ u_int ielength;
+ u_int codeset = 0;
+ u_int is_ansi = 0;
+ u_int ie_is_known;
+ u_int non_locking_shift;
+ u_int unshift_codeset;
+
+ ndo->ndo_protocol = "q.933";
+ ND_PRINT("%s", ndo->ndo_eflag ? "" : "Q.933");
+
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", length);
+ goto trunc;
}
- ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933, "));
-
- /* printing out header part */
- ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset));
-
- if (p[0]) {
- ND_PRINT((ndo, ", Call Ref: 0x%02x", p[0]));
- }
- if (ndo->ndo_vflag) {
- ND_PRINT((ndo, ", %s (0x%02x), length %u",
- tok2str(fr_q933_msg_values,
- "unknown message", p[1]),
- p[1],
- length));
- } else {
- ND_PRINT((ndo, ", %s",
- tok2str(fr_q933_msg_values,
- "unknown message 0x%02x", p[1])));
+ /*
+ * Get the length of the call reference value.
+ */
+ olen = length; /* preserve the original length for display */
+ call_ref_length = GET_U_1(p) & 0x0f;
+ p++;
+ length--;
+
+ /*
+ * Get the call reference value.
+ */
+ for (i = 0; i < call_ref_length; i++) {
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
+ }
+ call_ref[i] = GET_U_1(p);
+ p++;
+ length--;
}
- olen = length; /* preserve the original length for non verbose mode */
-
- if (length < (u_int)(2 - is_ansi)) {
- ND_PRINT((ndo, "[|q.933]"));
- return;
+ /*
+ * Get the message type.
+ */
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
}
- length -= 2 + is_ansi;
- ptemp += 2 + is_ansi;
-
- /* Loop through the rest of IE */
- while (length > sizeof(struct ie_tlv_header_t)) {
- ie_p = (const 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 (ndo->ndo_vflag) { /* not bark if there is just a trailer */
- ND_PRINT((ndo, "\n[|q.933]"));
- } else {
- ND_PRINT((ndo, ", length %u", olen));
- }
- return;
+ msgtype = GET_U_1(p);
+ p++;
+ length--;
+
+ /*
+ * Peek ahead to see if we start with a shift.
+ */
+ non_locking_shift = 0;
+ unshift_codeset = codeset;
+ if (length != 0) {
+ if (!ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
}
-
- /* lets do the full IE parsing only in verbose mode
- * however some IEs (DLCI Status, Link Verify)
- * are also interestting in non-verbose mode */
- if (ndo->ndo_vflag) {
- ND_PRINT((ndo, "\n\t%s IE (0x%02x), length %u: ",
- tok2str(fr_q933_ie_codesets[codeset],
- "unknown", ie_p->ie_type),
- ie_p->ie_type,
- ie_p->ie_len));
+ iecode = GET_U_1(p);
+ if (IE_IS_SHIFT(iecode)) {
+ /*
+ * It's a shift. Skip over it.
+ */
+ p++;
+ length--;
+
+ /*
+ * Get the codeset.
+ */
+ codeset = IE_SHIFT_CODESET(iecode);
+
+ /*
+ * If it's a locking shift to codeset 5,
+ * mark this as ANSI. (XXX - 5 is actually
+ * for national variants in general, not
+ * the US variant in particular, but maybe
+ * this is more American exceptionalism. :-))
+ */
+ if (IE_SHIFT_IS_LOCKING(iecode)) {
+ /*
+ * It's a locking shift.
+ */
+ if (codeset == 5) {
+ /*
+ * It's a locking shift to
+ * codeset 5, so this is
+ * T1.617 Annex D.
+ */
+ is_ansi = 1;
+ }
+ } else {
+ /*
+ * It's a non-locking shift.
+ * Remember the current codeset, so we
+ * can revert to it after the next IE.
+ */
+ non_locking_shift = 1;
+ unshift_codeset = 0;
+ }
}
+ }
- /* sanity check */
- if (ie_p->ie_type == 0 || ie_p->ie_len == 0) {
- return;
+ /* printing out header part */
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
+
+ if (call_ref_length != 0) {
+ ND_TCHECK_1(p);
+ if (call_ref_length > 1 || GET_U_1(p) != 0) {
+ /*
+ * Not a dummy call reference.
+ */
+ ND_PRINT(", Call Ref: 0x");
+ for (i = 0; i < call_ref_length; i++)
+ ND_PRINT("%02x", call_ref[i]);
}
+ }
+ if (ndo->ndo_vflag) {
+ ND_PRINT(", %s (0x%02x), length %u",
+ tok2str(fr_q933_msg_values,
+ "unknown message", msgtype),
+ msgtype,
+ olen);
+ } else {
+ ND_PRINT(", %s",
+ tok2str(fr_q933_msg_values,
+ "unknown message 0x%02x", msgtype));
+ }
- if (fr_q933_print_ie_codeset[codeset] != NULL) {
- ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, ie_p, ptemp);
+ /* Loop through the rest of the IEs */
+ while (length != 0) {
+ /*
+ * What's the state of any non-locking shifts?
+ */
+ if (non_locking_shift == 1) {
+ /*
+ * There's a non-locking shift in effect for
+ * this IE. Count it, so we reset the codeset
+ * before the next IE.
+ */
+ non_locking_shift = 2;
+ } else if (non_locking_shift == 2) {
+ /*
+ * Unshift.
+ */
+ codeset = unshift_codeset;
+ non_locking_shift = 0;
}
- if (ndo->ndo_vflag >= 1 && !ie_is_known) {
- print_unknown_data(ndo, ptemp+2, "\n\t", ie_p->ie_len);
+ /*
+ * Get the first octet of the IE.
+ */
+ if (!ND_TTEST_1(p)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
}
+ iecode = GET_U_1(p);
+ p++;
+ length--;
- /* do we want to see a hexdump of the IE ? */
- if (ndo->ndo_vflag> 1 && ie_is_known) {
- print_unknown_data(ndo, ptemp+2, "\n\t ", ie_p->ie_len);
+ /* Single-octet IE? */
+ if (IE_IS_SINGLE_OCTET(iecode)) {
+ /*
+ * Yes. Is it a shift?
+ */
+ if (IE_IS_SHIFT(iecode)) {
+ /*
+ * Yes. Is it locking?
+ */
+ if (IE_SHIFT_IS_LOCKING(iecode)) {
+ /*
+ * Yes.
+ */
+ non_locking_shift = 0;
+ } else {
+ /*
+ * No. Remember the current
+ * codeset, so we can revert
+ * to it after the next IE.
+ */
+ non_locking_shift = 1;
+ unshift_codeset = codeset;
+ }
+
+ /*
+ * Get the codeset.
+ */
+ codeset = IE_SHIFT_CODESET(iecode);
+ }
+ } else {
+ /*
+ * No. Get the IE length.
+ */
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
+ }
+ ielength = GET_U_1(p);
+ p++;
+ length--;
+
+ /* lets do the full IE parsing only in verbose mode
+ * however some IEs (DLCI Status, Link Verify)
+ * are also interesting in non-verbose mode */
+ if (ndo->ndo_vflag) {
+ ND_PRINT("\n\t%s IE (0x%02x), length %u: ",
+ tok2str(fr_q933_ie_codesets[codeset],
+ "unknown", iecode),
+ iecode,
+ ielength);
+ }
+
+ /* sanity checks */
+ if (iecode == 0 || ielength == 0) {
+ return;
+ }
+ if (length < ielength || !ND_TTEST_LEN(p, ielength)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
+ }
+
+ ie_is_known = 0;
+ if (fr_q933_print_ie_codeset[codeset] != NULL) {
+ ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, iecode, ielength, p);
+ }
+
+ if (ie_is_known) {
+ /*
+ * Known IE; do we want to see a hexdump
+ * of it?
+ */
+ if (ndo->ndo_vflag > 1) {
+ /* Yes. */
+ print_unknown_data(ndo, p, "\n\t ", ielength);
+ }
+ } else {
+ /*
+ * Unknown IE; if we're printing verbosely,
+ * print its content in hex.
+ */
+ if (ndo->ndo_vflag >= 1) {
+ print_unknown_data(ndo, p, "\n\t", ielength);
+ }
+ }
+
+ length -= ielength;
+ p += ielength;
}
-
- length = length - ie_p->ie_len - 2;
- ptemp = ptemp + ie_p->ie_len + 2;
}
- if (!ndo->ndo_vflag) {
- ND_PRINT((ndo, ", length %u", olen));
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
}
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
}
static int
-fr_q933_print_ie_codeset5(netdissect_options *ndo,
- const struct ie_tlv_header_t *ie_p, const u_char *p)
+fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
+ u_int ielength, const u_char *p)
{
u_int dlci;
- switch (ie_p->ie_type) {
+ switch (iecode) {
case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
case FR_LMI_CCITT_REPORT_TYPE_IE:
+ if (ielength < 1) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", ");
+ }
+ ND_PRINT("Invalid REPORT TYPE IE");
+ return 1;
+ }
if (ndo->ndo_vflag) {
- ND_PRINT((ndo, "%s (%u)",
- tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
- p[2]));
+ ND_PRINT("%s (%u)",
+ tok2str(fr_lmi_report_type_ie_values,"unknown",GET_U_1(p)),
+ GET_U_1(p));
}
return 1;
case FR_LMI_CCITT_LINK_VERIFY_IE:
case FR_LMI_ANSI_LINK_VERIFY_IE_91:
if (!ndo->ndo_vflag) {
- ND_PRINT((ndo, ", "));
+ ND_PRINT(", ");
}
- ND_PRINT((ndo, "TX Seq: %3d, RX Seq: %3d", p[2], p[3]));
+ if (ielength < 2) {
+ ND_PRINT("Invalid LINK VERIFY IE");
+ return 1;
+ }
+ ND_PRINT("TX Seq: %3d, RX Seq: %3d", GET_U_1(p), GET_U_1(p + 1));
return 1;
case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
case FR_LMI_CCITT_PVC_STATUS_IE:
if (!ndo->ndo_vflag) {
- ND_PRINT((ndo, ", "));
+ ND_PRINT(", ");
}
/* now parse the DLCI information element. */
- if ((ie_p->ie_len < 3) ||
- (p[2] & 0x80) ||
- ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
- ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
- ((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)) {
- ND_PRINT((ndo, "Invalid DLCI IE"));
+ if ((ielength < 3) ||
+ (GET_U_1(p) & 0x80) ||
+ ((ielength == 3) && !(GET_U_1(p + 1) & 0x80)) ||
+ ((ielength == 4) &&
+ ((GET_U_1(p + 1) & 0x80) || !(GET_U_1(p + 2) & 0x80))) ||
+ ((ielength == 5) &&
+ ((GET_U_1(p + 1) & 0x80) || (GET_U_1(p + 2) & 0x80) ||
+ !(GET_U_1(p + 3) & 0x80))) ||
+ (ielength > 5) ||
+ !(GET_U_1(p + ielength - 1) & 0x80)) {
+ ND_PRINT("Invalid DLCI in PVC STATUS IE");
+ return 1;
}
- dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
- if (ie_p->ie_len == 4) {
- dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
+ dlci = ((GET_U_1(p) & 0x3F) << 4) | ((GET_U_1(p + 1) & 0x78) >> 3);
+ if (ielength == 4) {
+ dlci = (dlci << 6) | ((GET_U_1(p + 2) & 0x7E) >> 1);
}
- else if (ie_p->ie_len == 5) {
- dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
+ else if (ielength == 5) {
+ dlci = (dlci << 13) | (GET_U_1(p + 2) & 0x7F) | ((GET_U_1(p + 3) & 0x7E) >> 1);
}
- ND_PRINT((ndo, "DLCI %u: status %s%s", dlci,
- p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
- p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"));
+ ND_PRINT("DLCI %u: status %s%s", dlci,
+ GET_U_1(p + ielength - 1) & 0x8 ? "New, " : "",
+ GET_U_1(p + ielength - 1) & 0x2 ? "Active" : "Inactive");
return 1;
}
return 0;
}
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff