diff options
Diffstat (limited to 'listen/ax25dump.c')
| -rw-r--r-- | listen/ax25dump.c | 335 |
1 files changed, 174 insertions, 161 deletions
diff --git a/listen/ax25dump.c b/listen/ax25dump.c index 5265453..4c4a40c 100644 --- a/listen/ax25dump.c +++ b/listen/ax25dump.c @@ -1,4 +1,4 @@ -/* @(#) $Header: /home/ax25-cvs/ax25-apps/listen/ax25dump.c,v 1.1 2001/04/10 01:58:51 csmall Exp $ */ +/* @(#) $Header: /home/ax25-cvs/ax25-apps/listen/ax25dump.c,v 1.2 2001/09/12 13:18:43 terry Exp $ */ /* AX25 header tracing * Copyright 1991 Phil Karn, KA9Q @@ -57,7 +57,7 @@ #define Y 4 #define Z 8 -static int ftype(unsigned char *, int *, int *, int *, int *, int); +static int ftype(unsigned char *, int *, int *, int *, int *, int); static char *decode_type(int); #define NDAMA_STRING "" @@ -90,11 +90,13 @@ void ax25_dump(unsigned char *data, int length, int hexdump) tmp[4] = ' ' + (data[5] >> 2); tmp[5] = ' ' + ((data[5] << 4) & 0x30) + (data[6] >> 4); if (data[6] & 0xf) - sprintf(tmp+7, "-%d", data[6] & 0xf); - lprintf(T_ADDR, "%d->%s%s", (data[0] << 6) | ((data[1] >> 2) & 0x3f), strtok(tmp, " "), tmp+7); + sprintf(tmp + 7, "-%d", data[6] & 0xf); + lprintf(T_ADDR, "%d->%s%s", + (data[0] << 6) | ((data[1] >> 2) & 0x3f), + strtok(tmp, " "), tmp + 7); cmdrsp = (data[1] & 2) ? LAPB_COMMAND : LAPB_RESPONSE; dama = NDAMA_STRING; - data += 7; + data += 7; length -= 7; } else { /* Extract the address header */ @@ -103,124 +105,133 @@ void ax25_dump(unsigned char *data, int length, int hexdump) lprintf(T_ERROR, "AX25: bad header!\n"); return; } - + if ((data[AXLEN + ALEN] & SSSID_SPARE) == SSSID_SPARE) { extseq = 0; -// lprintf(T_PROTOCOL, " "); +// lprintf(T_PROTOCOL, " "); } else { extseq = 1; lprintf(T_PROTOCOL, "EAX25: "); } - + if ((data[AXLEN + ALEN] & ESSID_SPARE) == ESSID_SPARE) dama = NDAMA_STRING; else dama = DAMA_STRING; - - lprintf(T_AXHDR, "fm "); + + lprintf(T_AXHDR, "fm "); lprintf(T_ADDR, "%s", pax25(tmp, data + AXLEN)); lprintf(T_AXHDR, " to "); lprintf(T_ADDR, "%s", pax25(tmp, data)); - + cmdrsp = LAPB_UNKNOWN; - + if ((data[ALEN] & C) && !(data[AXLEN + ALEN] & C)) cmdrsp = LAPB_COMMAND; - + if ((data[AXLEN + ALEN] & C) && !(data[ALEN] & C)) cmdrsp = LAPB_RESPONSE; end = (data[AXLEN + ALEN] & HDLCAEB); - - data += (AXLEN + AXLEN); + + data += (AXLEN + AXLEN); length -= (AXLEN + AXLEN); if (!end) { lprintf(T_AXHDR, " via"); - + while (!end) { /* Print digi string */ - lprintf(T_ADDR," %s%s", pax25(tmp, data), (data[ALEN] & REPEATED) ? "*" : ""); - + lprintf(T_ADDR, " %s%s", pax25(tmp, data), + (data[ALEN] & REPEATED) ? "*" : + ""); + end = (data[ALEN] & HDLCAEB); - - data += AXLEN; + + data += AXLEN; length -= AXLEN; } } } - if (length == 0) return; - + if (length == 0) + return; + ctlen = ftype(data, &type, &ns, &nr, &pf, extseq); - - data += ctlen; + + data += ctlen; length -= ctlen; lprintf(T_AXHDR, " ctl %s", decode_type(type)); - if ((type & 0x3) != U) /* I or S frame? */ - lprintf(T_AXHDR, "%d", nr); + if ((type & 0x3) != U) /* I or S frame? */ + lprintf(T_AXHDR, "%d", nr); if (type == I) - lprintf(T_AXHDR, "%d", ns); - + lprintf(T_AXHDR, "%d", ns); + switch (cmdrsp) { - case LAPB_COMMAND: - if (pf) lprintf(T_AXHDR, "+"); - else lprintf(T_AXHDR, "^"); - break; - case LAPB_RESPONSE: - if (pf) lprintf(T_AXHDR, "-"); - else lprintf(T_AXHDR, "v"); - break; - default: - break; + case LAPB_COMMAND: + if (pf) + lprintf(T_AXHDR, "+"); + else + lprintf(T_AXHDR, "^"); + break; + case LAPB_RESPONSE: + if (pf) + lprintf(T_AXHDR, "-"); + else + lprintf(T_AXHDR, "v"); + break; + default: + break; } if (type == I || type == UI) { /* Decode I field */ - if (length > 0) { /* Get pid */ + if (length > 0) { /* Get pid */ pid = *data++; length--; - lprintf(T_AXHDR," pid=%X",pid); - - switch (pid) { - case PID_SEGMENT: - lprintf(T_AXHDR,"(segment)"); - break; - case PID_ARP: - lprintf(T_AXHDR,"(ARP)"); - break; - case PID_NETROM: - lprintf(T_AXHDR,"(NET/ROM)"); - break; - case PID_IP: - lprintf(T_AXHDR,"(IP)"); - break; - case PID_X25: - lprintf(T_AXHDR, "(X.25)"); - break; - case PID_TEXNET: - lprintf(T_AXHDR, "(TEXNET)"); - break; - case PID_FLEXNET: - lprintf(T_AXHDR, "(FLEXNET)"); - break; - case PID_NO_L3: - lprintf(T_AXHDR, "(Text)"); - break; + lprintf(T_AXHDR, " pid=%X", pid); + + switch (pid) { + case PID_SEGMENT: + lprintf(T_AXHDR, "(segment)"); + break; + case PID_ARP: + lprintf(T_AXHDR, "(ARP)"); + break; + case PID_NETROM: + lprintf(T_AXHDR, "(NET/ROM)"); + break; + case PID_IP: + lprintf(T_AXHDR, "(IP)"); + break; + case PID_X25: + lprintf(T_AXHDR, "(X.25)"); + break; + case PID_TEXNET: + lprintf(T_AXHDR, "(TEXNET)"); + break; + case PID_FLEXNET: + lprintf(T_AXHDR, "(FLEXNET)"); + break; + case PID_NO_L3: + lprintf(T_AXHDR, "(Text)"); + break; } - lprintf(T_AXHDR, "%s len %d ",dama,length); + lprintf(T_AXHDR, "%s len %d ", dama, length); - if(timestamp) + if (timestamp) display_timestamp(); if (pid == PID_SEGMENT) { seg = *data++; length--; - lprintf(T_AXHDR, "%s remain %u", seg & SEG_FIRST ? " First seg;" : "", seg & SEG_REM); + lprintf(T_AXHDR, "%s remain %u", + seg & SEG_FIRST ? " First seg;" : + "", seg & SEG_REM); if (seg & SEG_FIRST) { pid = *data++; @@ -230,99 +241,99 @@ void ax25_dump(unsigned char *data, int length, int hexdump) lprintf(T_AXHDR, "\n"); switch (pid) { - case PID_SEGMENT: - data_dump(data, length, hexdump); - break; - case PID_ARP: - arp_dump(data, length); - break; - case PID_NETROM: - netrom_dump(data, length, hexdump); - break; - case PID_IP: - ip_dump(data, length, hexdump); - break; - case PID_X25: - rose_dump(data, length, hexdump); - break; - case PID_TEXNET: - data_dump(data, length, hexdump); - break; - case PID_FLEXNET: - flexnet_dump(data, length, hexdump); - break; - case PID_NO_L3: - data_dump(data, length, hexdump); - break; - default: - data_dump(data, length, hexdump); - break; + case PID_SEGMENT: + data_dump(data, length, hexdump); + break; + case PID_ARP: + arp_dump(data, length); + break; + case PID_NETROM: + netrom_dump(data, length, hexdump); + break; + case PID_IP: + ip_dump(data, length, hexdump); + break; + case PID_X25: + rose_dump(data, length, hexdump); + break; + case PID_TEXNET: + data_dump(data, length, hexdump); + break; + case PID_FLEXNET: + flexnet_dump(data, length, hexdump); + break; + case PID_NO_L3: + data_dump(data, length, hexdump); + break; + default: + data_dump(data, length, hexdump); + break; } } } else if (type == FRMR && length >= 3) { - /* FIX ME XXX - lprintf(T_AXHDR, ": %s", decode_type(ftype(data[0]))); - */ + /* FIX ME XXX + lprintf(T_AXHDR, ": %s", decode_type(ftype(data[0]))); + */ lprintf(T_AXHDR, ": %02X", data[0]); lprintf(T_AXHDR, " Vr = %d Vs = %d", - (data[1] >> 5) & MMASK, - (data[1] >> 1) & MMASK); - if(data[2] & W) + (data[1] >> 5) & MMASK, (data[1] >> 1) & MMASK); + if (data[2] & W) lprintf(T_ERROR, " Invalid control field"); - if(data[2] & X) + if (data[2] & X) lprintf(T_ERROR, " Illegal I-field"); - if(data[2] & Y) + if (data[2] & Y) lprintf(T_ERROR, " Too-long I-field"); - if(data[2] & Z) + if (data[2] & Z) lprintf(T_ERROR, " Invalid seq number"); - lprintf(T_AXHDR,"%s ", dama); + lprintf(T_AXHDR, "%s ", dama); - if(timestamp) - display_timestamp(); - lprintf(T_AXHDR,"\n"); + if (timestamp) + display_timestamp(); + lprintf(T_AXHDR, "\n"); } else if ((type == SABM || type == UA) && length >= 2) { /* FlexNet transmits the QSO "handle" for header * compression in SABM and UA frame data fields */ - lprintf(T_AXHDR," [%d]%s ", (data[0] << 8) | data[1], dama); - if(timestamp) + lprintf(T_AXHDR, " [%d]%s ", (data[0] << 8) | data[1], + dama); + if (timestamp) display_timestamp(); - lprintf(T_AXHDR,"\n"); + lprintf(T_AXHDR, "\n"); } else { - lprintf(T_AXHDR,"%s ", dama); - if(timestamp) - display_timestamp(); - lprintf(T_AXHDR,"\n"); + lprintf(T_AXHDR, "%s ", dama); + if (timestamp) + display_timestamp(); + lprintf(T_AXHDR, "\n"); } } static char *decode_type(int type) { switch (type) { - case I: - return "I"; - case SABM: - return "SABM"; - case SABME: - return "SABME"; - case DISC: - return "DISC"; - case DM: - return "DM"; - case UA: - return "UA"; - case RR: - return "RR"; - case RNR: - return "RNR"; - case REJ: - return "REJ"; - case FRMR: - return "FRMR"; - case UI: - return "UI"; - default: - return "[invalid]"; + case I: + return "I"; + case SABM: + return "SABM"; + case SABME: + return "SABME"; + case DISC: + return "DISC"; + case DM: + return "DM"; + case UA: + return "UA"; + case RR: + return "RR"; + case RNR: + return "RNR"; + case REJ: + return "REJ"; + case FRMR: + return "FRMR"; + case UI: + return "UI"; + default: + return "[invalid]"; } } @@ -331,9 +342,9 @@ char *pax25(char *buf, unsigned char *data) int i, ssid; char *s; char c; - + s = buf; - + for (i = 0; i < ALEN; i++) { c = (data[i] >> 1) & 0x7F; @@ -341,56 +352,58 @@ char *pax25(char *buf, unsigned char *data) strcpy(buf, "[invalid]"); return buf; } - - if (c != ' ') *s++ = c; - } + + if (c != ' ') + *s++ = c; + } if ((ssid = (data[ALEN] & SSID)) != 0) sprintf(s, "-%d", ssid >> 1); else *s = '\0'; - return(buf); + return (buf); } -static int ftype(unsigned char *data, int *type, int *ns, int *nr, int *pf, int extseq) +static int ftype(unsigned char *data, int *type, int *ns, int *nr, int *pf, + int extseq) { if (extseq) { if ((*data & 0x01) == 0) { /* An I frame is an I-frame ... */ *type = I; - *ns = (*data >> 1) & 127; + *ns = (*data >> 1) & 127; data++; - *nr = (*data >> 1) & 127; - *pf = *data & EPF; + *nr = (*data >> 1) & 127; + *pf = *data & EPF; return 2; } if (*data & 0x02) { *type = *data & ~PF; - *pf = *data & PF; + *pf = *data & PF; return 1; } else { *type = *data; data++; - *nr = (*data >> 1) & 127; - *pf = *data & EPF; + *nr = (*data >> 1) & 127; + *pf = *data & EPF; return 2; } } else { if ((*data & 0x01) == 0) { /* An I frame is an I-frame ... */ *type = I; - *ns = (*data >> 1) & 7; - *nr = (*data >> 5) & 7; - *pf = *data & PF; + *ns = (*data >> 1) & 7; + *nr = (*data >> 5) & 7; + *pf = *data & PF; return 1; } - if (*data & 0x02) { /* U-frames use all except P/F bit for type */ + if (*data & 0x02) { /* U-frames use all except P/F bit for type */ *type = *data & ~PF; - *pf = *data & PF; + *pf = *data & PF; return 1; - } else { /* S-frames use low order 4 bits for type */ + } else { /* S-frames use low order 4 bits for type */ *type = *data & 0x0F; - *nr = (*data >> 5) & 7; - *pf = *data & PF; + *nr = (*data >> 5) & 7; + *pf = *data & PF; return 1; } } |