X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/03c3587323e8b9bc7ca83716eb11b84eb46a2af2..3eaf36bd56ae40399adece771e87cc593b4ed35a:/print-bootp.c diff --git a/print-bootp.c b/print-bootp.c index 0d780df7..c0077eeb 100644 --- a/print-bootp.c +++ b/print-bootp.c @@ -21,24 +21,16 @@ * Format and print bootp packets. */ #ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.61 2002-04-26 04:59:08 guy Exp $ (LBL)"; +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.78.2.2 2005-05-06 04:19:39 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include -#include -#include +#include -struct mbuf; -struct rtentry; - -#include - -#include #include #include @@ -53,12 +45,22 @@ static void cmu_print(const u_char *); static char tstr[] = " [|bootp]"; +static const struct tok bootp_flag_values[] = { + { 0x8000, "Broadcast" }, + { 0, NULL} +}; + +static const struct tok bootp_op_values[] = { + { BOOTPREQUEST, "Request" }, + { BOOTPREPLY, "Reply" }, + { 0, NULL} +}; + /* * Print bootp requests */ void -bootp_print(register const u_char *cp, u_int length, - u_short sport, u_short dport) +bootp_print(register const u_char *cp, u_int length) { register const struct bootp *bp; static const u_char vm_cmu[4] = VM_CMU; @@ -66,84 +68,72 @@ bootp_print(register const u_char *cp, u_int length, bp = (const struct bootp *)cp; TCHECK(bp->bp_op); - switch (bp->bp_op) { - - case BOOTREQUEST: - /* Usually, a request goes from a client to a server */ - if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS) - printf(" (request)"); - break; - - case BOOTREPLY: - /* Usually, a reply goes from a server to a client */ - if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC) - printf(" (reply)"); - break; - - default: - printf(" bootp-#%d", bp->bp_op); + + printf("BOOTP/DHCP, %s", + tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)); + + if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) { + TCHECK2(bp->bp_chaddr[0], 6); + printf(" from %s", etheraddr_string(bp->bp_chaddr)); } + printf(", length: %u", length); + + if (!vflag) + return; + TCHECK(bp->bp_secs); /* The usual hardware address type is 1 (10Mb Ethernet) */ if (bp->bp_htype != 1) - printf(" htype-#%d", bp->bp_htype); + printf(", htype-#%d", bp->bp_htype); /* The usual length for 10Mb Ethernet address is 6 bytes */ if (bp->bp_htype != 1 || bp->bp_hlen != 6) - printf(" hlen:%d", bp->bp_hlen); + printf(", hlen:%d", bp->bp_hlen); /* Only print interesting fields */ if (bp->bp_hops) - printf(" hops:%d", bp->bp_hops); + printf(", hops:%d", bp->bp_hops); if (bp->bp_xid) - printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid)); + printf(", xid:0x%x", EXTRACT_32BITS(&bp->bp_xid)); if (bp->bp_secs) - printf(" secs:%d", ntohs(bp->bp_secs)); - if (bp->bp_flags) - printf(" flags:0x%x", ntohs(bp->bp_flags)); + printf(", secs:%d", EXTRACT_16BITS(&bp->bp_secs)); + + printf(", flags: [%s]", + bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))); + if (vflag>1) + printf( " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)); /* Client's ip address */ TCHECK(bp->bp_ciaddr); if (bp->bp_ciaddr.s_addr) - printf(" C:%s", ipaddr_string(&bp->bp_ciaddr)); + printf("\n\t Client IP: %s", ipaddr_string(&bp->bp_ciaddr)); /* 'your' ip address (bootp client) */ TCHECK(bp->bp_yiaddr); if (bp->bp_yiaddr.s_addr) - printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr)); + printf("\n\t Your IP: %s", ipaddr_string(&bp->bp_yiaddr)); /* Server's ip address */ TCHECK(bp->bp_siaddr); if (bp->bp_siaddr.s_addr) - printf(" S:%s", ipaddr_string(&bp->bp_siaddr)); + printf("\n\t Server IP: %s", ipaddr_string(&bp->bp_siaddr)); /* Gateway's ip address */ TCHECK(bp->bp_giaddr); if (bp->bp_giaddr.s_addr) - printf(" G:%s", ipaddr_string(&bp->bp_giaddr)); + printf("\n\t Gateway IP: %s", ipaddr_string(&bp->bp_giaddr)); /* Client's Ethernet address */ if (bp->bp_htype == 1 && bp->bp_hlen == 6) { - register const struct ether_header *eh; - register const char *e; - TCHECK2(bp->bp_chaddr[0], 6); - eh = (const struct ether_header *)packetp; - if (bp->bp_op == BOOTREQUEST) - e = (const char *)ESRC(eh); - else if (bp->bp_op == BOOTREPLY) - e = (const char *)EDST(eh); - else - e = 0; - if (e == 0 || memcmp((const char *)bp->bp_chaddr, e, 6) != 0) - printf(" ether %s", etheraddr_string(bp->bp_chaddr)); + printf("\n\t Client Ethernet Address: %s", etheraddr_string(bp->bp_chaddr)); } TCHECK2(bp->bp_sname[0], 1); /* check first char only */ if (*bp->bp_sname) { - printf(" sname \""); + printf("\n\t sname \""); if (fn_print(bp->bp_sname, snapend)) { putchar('"'); fputs(tstr + 1, stdout); @@ -151,9 +141,9 @@ bootp_print(register const u_char *cp, u_int length, } putchar('"'); } - TCHECK2(bp->bp_sname[0], 1); /* check first char only */ + TCHECK2(bp->bp_file[0], 1); /* check first char only */ if (*bp->bp_file) { - printf(" file \""); + printf("\n\t file \""); if (fn_print(bp->bp_file, snapend)) { putchar('"'); fputs(tstr + 1, stdout); @@ -175,7 +165,7 @@ bootp_print(register const u_char *cp, u_int length, ul = EXTRACT_32BITS(&bp->bp_vend); if (ul != 0) - printf("vend-#0x%x", ul); + printf("\n\t Vendor-#0x%x", ul); } return; @@ -287,7 +277,7 @@ static struct tok tag2str[] = { { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */ /* RFC 3011 */ { TAG_IP4_SUBNET_SELECT, "iSUBNET" }, -/* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */ +/* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */ { TAG_USER_CLASS, "aCLASS" }, { TAG_SLP_NAMING_AUTH, "aSLP-NA" }, { TAG_CLIENT_FQDN, "$FQDN" }, @@ -358,7 +348,7 @@ rfc1048_print(register const u_char *bp) u_int16_t us; u_int8_t uc; - printf(" vend-rfc1048"); + printf("\n\t Vendor-rfc1048:"); /* Step over magic cookie */ bp += sizeof(int32_t); @@ -381,7 +371,7 @@ rfc1048_print(register const u_char *bp) } else cp = tok2str(tag2str, "?T%u", tag); c = *cp++; - printf(" %s:", cp); + printf("\n\t %s:", cp); /* Get the length; check for truncation */ if (bp + 1 >= snapend) { @@ -390,7 +380,7 @@ rfc1048_print(register const u_char *bp) } len = *bp++; if (bp + len >= snapend) { - fputs(tstr, stdout); + printf("[|bootp %u]", len); return; } @@ -454,7 +444,10 @@ rfc1048_print(register const u_char *bp) case 'a': /* ascii strings */ putchar('"'); - (void)fn_printn(bp, size, NULL); + if (fn_printn(bp, size, snapend)) { + putchar('"'); + goto trunc; + } putchar('"'); bp += size; size = 0; @@ -566,13 +559,21 @@ rfc1048_print(register const u_char *bp) break; case TAG_CLIENT_FQDN: + /* option 81 should be at least 4 bytes long */ + if (len < 4) { + printf("ERROR: options 81 len %u < 4 bytes", len); + break; + } if (*bp++) printf("[svrreg]"); if (*bp) printf("%u/%u/", *bp, *(bp+1)); bp += 2; putchar('"'); - (void)fn_printn(bp, size - 3, NULL); + if (fn_printn(bp, size - 3, snapend)) { + putchar('"'); + goto trunc; + } putchar('"'); bp += size - 3; size = 0; @@ -583,8 +584,13 @@ rfc1048_print(register const u_char *bp) size--; if (type == 0) { putchar('"'); - (void)fn_printn(bp, size, NULL); + if (fn_printn(bp, size, snapend)) { + putchar('"'); + goto trunc; + } putchar('"'); + bp += size; + size = 0; break; } else { printf("[%s]", tok2str(arp2str, "type-%d", type)); @@ -610,8 +616,10 @@ rfc1048_print(register const u_char *bp) break; } /* Data left over? */ - if (size) + if (size) { printf("[len %u]", len); + bp += size; + } } return; trunc: