X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/9e67c058df490bd466894a82e354c6f13d815426..da20bc56d6100b5275d6f85c4a25bac1dab4e57e:/print-zephyr.c diff --git a/print-zephyr.c b/print-zephyr.c index 9727adaa..735e273f 100644 --- a/print-zephyr.c +++ b/print-zephyr.c @@ -1,6 +1,8 @@ /* * Decode and print Zephyr packets. * + * http://web.mit.edu/zephyr/doc/protocol + * * Copyright (c) 2001 Nickolai Zeldovich * All rights reserved. * @@ -18,45 +20,42 @@ * PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-zephyr.c,v 1.2 2001-09-11 02:37:12 guy Exp $"; -#endif +/* \summary: Zephyr printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif +#include + #include -#include #include #include -#include -#include "interface.h" +#include "netdissect.h" struct z_packet { - char *version; + const char *version; int numfields; int kind; - char *uid; + const char *uid; int port; int auth; int authlen; - char *authdata; - char *class; - char *inst; - char *opcode; - char *sender; - char *recipient; - char *format; + const char *authdata; + const char *class; + const char *inst; + const char *opcode; + const char *sender; + const char *recipient; + const char *format; int cksum; int multi; - char *multi_uid; + const char *multi_uid; /* Other fields follow here.. */ }; -enum { +enum z_packet_type { Z_PACKET_UNSAFE = 0, Z_PACKET_UNACKED, Z_PACKET_ACKED, @@ -66,9 +65,9 @@ enum { Z_PACKET_SERVNAK, Z_PACKET_CLIENTACK, Z_PACKET_STAT -} z_packet_type; +}; -static struct tok z_types[] = { +static const struct tok z_types[] = { { Z_PACKET_UNSAFE, "unsafe" }, { Z_PACKET_UNACKED, "unacked" }, { Z_PACKET_ACKED, "acked" }, @@ -77,35 +76,46 @@ static struct tok z_types[] = { { Z_PACKET_SERVACK, "serv-ack" }, { Z_PACKET_SERVNAK, "serv-nak" }, { Z_PACKET_CLIENTACK, "client-ack" }, - { Z_PACKET_STAT, "stat" } + { Z_PACKET_STAT, "stat" }, + { 0, NULL } }; -char z_buf[256]; +static char z_buf[256]; -static char * -parse_field(char **pptr, int *len) +static const char * +parse_field(netdissect_options *ndo, const char **pptr, int *len, int *truncated) { - char *s; - - if (*len <= 0 || !pptr || !*pptr) - return NULL; - if (*pptr > (char *) snapend) - return NULL; + const char *s; + /* Start of string */ s = *pptr; - while (*pptr <= (char *) snapend && *len >= 0 && **pptr) { + /* Scan for the NUL terminator */ + for (;;) { + if (*len == 0) { + /* Ran out of packet data without finding it */ + return NULL; + } + if (!ND_TTEST(**pptr)) { + /* Ran out of captured data without finding it */ + *truncated = 1; + return NULL; + } + if (**pptr == '\0') { + /* Found it */ + break; + } + /* Keep scanning */ (*pptr)++; (*len)--; } + /* Skip the NUL terminator */ (*pptr)++; (*len)--; - if (*len < 0 || *pptr > (char *) snapend) - return NULL; return s; } static const char * -z_triple(char *class, char *inst, char *recipient) +z_triple(const char *class, const char *inst, const char *recipient) { if (!*recipient) recipient = "*"; @@ -115,31 +125,44 @@ z_triple(char *class, char *inst, char *recipient) } static const char * -str_to_lower(char *string) +str_to_lower(const char *string) { + char *zb_string; + strncpy(z_buf, string, sizeof(z_buf)); z_buf[sizeof(z_buf)-1] = '\0'; - string = z_buf; - while (*string) { - *string = tolower(*string); - string++; + zb_string = z_buf; + while (*zb_string) { + *zb_string = tolower((unsigned char)(*zb_string)); + zb_string++; } return z_buf; } void -zephyr_print(const u_char *cp, int length) +zephyr_print(netdissect_options *ndo, const u_char *cp, int length) { struct z_packet z; - char *parse = (char *) cp; + const char *parse = (const char *) cp; int parselen = length; - char *s; + const char *s; int lose = 0; + int truncated = 0; + + /* squelch compiler warnings */ + + z.kind = 0; + z.class = 0; + z.inst = 0; + z.opcode = 0; + z.sender = 0; + z.recipient = 0; -#define PARSE_STRING \ - s = parse_field(&parse, &parselen); \ +#define PARSE_STRING \ + s = parse_field(ndo, &parse, &parselen, &truncated); \ + if (truncated) goto trunc; \ if (!s) lose = 1; #define PARSE_FIELD_INT(field) \ @@ -172,39 +195,37 @@ zephyr_print(const u_char *cp, int length) PARSE_FIELD_INT(z.multi); PARSE_FIELD_STR(z.multi_uid); - if (lose) { - printf(" [|zephyr] (%d)", length); - return; - } + if (lose) + goto trunc; - printf(" zephyr"); + ND_PRINT((ndo, " zephyr")); if (strncmp(z.version+4, "0.2", 3)) { - printf(" v%s", z.version+4); + ND_PRINT((ndo, " v%s", z.version+4)); return; } - printf(" %s", tok2str(z_types, "type %d", z.kind)); + ND_PRINT((ndo, " %s", tok2str(z_types, "type %d", z.kind))); if (z.kind == Z_PACKET_SERVACK) { /* Initialization to silence warnings */ - char *ackdata = NULL; + const char *ackdata = NULL; PARSE_FIELD_STR(ackdata); if (!lose && strcmp(ackdata, "SENT")) - printf("/%s", str_to_lower(ackdata)); + ND_PRINT((ndo, "/%s", str_to_lower(ackdata))); } - if (*z.sender) printf(" %s", z.sender); + if (*z.sender) ND_PRINT((ndo, " %s", z.sender)); if (!strcmp(z.class, "USER_LOCATE")) { if (!strcmp(z.opcode, "USER_HIDE")) - printf(" hide"); + ND_PRINT((ndo, " hide")); else if (!strcmp(z.opcode, "USER_UNHIDE")) - printf(" unhide"); + ND_PRINT((ndo, " unhide")); else - printf(" locate %s", z.inst); + ND_PRINT((ndo, " locate %s", z.inst)); return; } if (!strcmp(z.class, "ZEPHYR_ADMIN")) { - printf(" zephyr-admin %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " zephyr-admin %s", str_to_lower(z.opcode))); return; } @@ -214,79 +235,79 @@ zephyr_print(const u_char *cp, int length) !strcmp(z.opcode, "SUBSCRIBE_NODEFS") || !strcmp(z.opcode, "UNSUBSCRIBE")) { - printf(" %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "", + ND_PRINT((ndo, " %ssub%s", strcmp(z.opcode, "SUBSCRIBE") ? "un" : "", strcmp(z.opcode, "SUBSCRIBE_NODEFS") ? "" : - "-nodefs"); + "-nodefs")); if (z.kind != Z_PACKET_SERVACK) { /* Initialization to silence warnings */ - char *c = NULL, *i = NULL, *r = NULL; + const char *c = NULL, *i = NULL, *r = NULL; PARSE_FIELD_STR(c); PARSE_FIELD_STR(i); PARSE_FIELD_STR(r); - if (!lose) printf(" %s", z_triple(c, i, r)); + if (!lose) ND_PRINT((ndo, " %s", z_triple(c, i, r))); } return; } if (!strcmp(z.opcode, "GIMME")) { - printf(" ret"); + ND_PRINT((ndo, " ret")); return; } if (!strcmp(z.opcode, "GIMMEDEFS")) { - printf(" gimme-defs"); + ND_PRINT((ndo, " gimme-defs")); return; } if (!strcmp(z.opcode, "CLEARSUB")) { - printf(" clear-subs"); + ND_PRINT((ndo, " clear-subs")); return; } - printf(" %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); return; } if (!strcmp(z.inst, "HM")) { - printf(" %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); return; } if (!strcmp(z.inst, "REALM")) { if (!strcmp(z.opcode, "ADD_SUBSCRIBE")) - printf(" realm add-subs"); + ND_PRINT((ndo, " realm add-subs")); if (!strcmp(z.opcode, "REQ_SUBSCRIBE")) - printf(" realm req-subs"); + ND_PRINT((ndo, " realm req-subs")); if (!strcmp(z.opcode, "RLM_SUBSCRIBE")) - printf(" realm rlm-sub"); + ND_PRINT((ndo, " realm rlm-sub")); if (!strcmp(z.opcode, "RLM_UNSUBSCRIBE")) - printf(" realm rlm-unsub"); + ND_PRINT((ndo, " realm rlm-unsub")); return; } } if (!strcmp(z.class, "HM_CTL")) { - printf(" hm_ctl %s", str_to_lower(z.inst)); - printf(" %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " hm_ctl %s", str_to_lower(z.inst))); + ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); return; } if (!strcmp(z.class, "HM_STAT")) { if (!strcmp(z.inst, "HMST_CLIENT") && !strcmp(z.opcode, "GIMMESTATS")) { - printf(" get-client-stats"); + ND_PRINT((ndo, " get-client-stats")); return; } } if (!strcmp(z.class, "WG_CTL")) { - printf(" wg_ctl %s", str_to_lower(z.inst)); - printf(" %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " wg_ctl %s", str_to_lower(z.inst))); + ND_PRINT((ndo, " %s", str_to_lower(z.opcode))); return; } if (!strcmp(z.class, "LOGIN")) { if (!strcmp(z.opcode, "USER_FLUSH")) { - printf(" flush_locs"); + ND_PRINT((ndo, " flush_locs")); return; } @@ -296,7 +317,7 @@ zephyr_print(const u_char *cp, int length) !strcmp(z.opcode, "REALM-ANNOUNCED") || !strcmp(z.opcode, "NET-VISIBLE") || !strcmp(z.opcode, "NET-ANNOUNCED")) { - printf(" set-exposure %s", str_to_lower(z.opcode)); + ND_PRINT((ndo, " set-exposure %s", str_to_lower(z.opcode))); return; } } @@ -304,8 +325,12 @@ zephyr_print(const u_char *cp, int length) if (!*z.recipient) z.recipient = "*"; - printf(" to %s", z_triple(z.class, z.inst, z.recipient)); + ND_PRINT((ndo, " to %s", z_triple(z.class, z.inst, z.recipient))); if (*z.opcode) - printf(" op %s", z.opcode); + ND_PRINT((ndo, " op %s", z.opcode)); + return; + +trunc: + ND_PRINT((ndo, " [|zephyr] (%d)", length)); return; }