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utils.c

/*
 * Copyright (c) 2000 Paul Herman
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: utils.c,v 1.19 2000/11/03 12:39:24 pherman Exp $
 */

#include "tcpstat.h"

char str[BUF_SIZ];

int is_ethernetarp_packet(packet_data *p) {
      return ( (p->link_type & LINK_ETHERNET) &&
             (p->ether.ether_type == ETHERTYPE_ARP)
                  );    /* Requires ethernet.h */
}

int is_ip_packet(packet_data *p) {
      return ((p->link_type & LINK_NONE_OTHER) == GENERIC_LINK_IP);
}

#ifdef INET6
int is_ip6_packet(packet_data *p) {
      return ((p->link_type & LINK_NONE_OTHER) == GENERIC_LINK_IP6);
}
#endif

unsigned char get_ip_proto(packet_data *p) {
      struct ip *ip;
            /* XXX: Is there TCP/UDP that *doesn't* go over IP?,
                  must be somewhere, but just say no for now.
             */
      if (is_ip_packet(p)) {
         ip = &(p->data.ip.hdr);
         return ( ip->ip_p );
         }
#ifdef INET6
      else if (is_ip6_packet(p)) {
         struct ip6_hdr *ip6;
         ip6 = &(p->data.ip6.hdr);
         return ( ip6->ip6_nxt );
         }
#endif
      return 0;
}

int is_ip_tcp_packet(packet_data *p) {
      return ( get_ip_proto(p) == IPPROTO_TCP );
}

int is_ip_udp_packet(packet_data *p) {
      return ( get_ip_proto(p) == IPPROTO_UDP );
}

int is_ip_icmp_packet(packet_data *p) {
      return ( get_ip_proto(p) == IPPROTO_ICMP
#ifdef INET6
            || get_ip_proto(p) == IPPROTO_ICMPV6
#endif
            );
}

char *my_basename(char *p) {
      char *s;

      s = p;
      if (!*s || strlen(s) < 2) return p;

      for (s += strlen(p); s>p && *s != '/'; s--) continue;
      return (*s == '/')? s+1 : s;
}

u_char count_1bits(u_int x) {
      u_char r = 0;
      int i;

      for (i=0; i<8*sizeof(x); i++)
            if ( (x>>i) & 0x1 ) r++;
      return r;
};

char *my_get_port(u_short port, int n_only) {
      struct servent *srvent;
      if (n_only) {
            snprintf(str, BUF_SIZ, "%u", port);
            }
      else {
              srvent = getservbyport(htons(port), NULL);
            if (srvent == NULL) snprintf(str, BUF_SIZ, "%u", port);
            else  snprintf(str, BUF_SIZ, "%s (%u)", srvent->s_name, port);
            }
      return str;
}

char *my_get_proto(u_short proto, int n_only) {
      struct protoent *ip_prot;

      if (n_only) {
            snprintf(str, BUF_SIZ, "%u", proto);
            }
      else {
              ip_prot = getprotobynumber(proto);
            if (ip_prot == NULL) snprintf(str, BUF_SIZ, "%u", proto);
            else  snprintf(str, BUF_SIZ, "%s", ip_prot->p_name);
            }
      return str;
}

      /* XXX: Does this define belong here? */
#define MAX_STRCPY      32768

char *my_safe_strcpy(char **dst, const char *src) {
      size_t n;

      n = strlen(src)*sizeof(char);
      if (n<1) n = 1;
      if (n>MAX_STRCPY) n = MAX_STRCPY;

      if (*dst != NULL) free(*dst);
      *dst = (char *)malloc(n+1);
      if (*dst == NULL) {
            perror("my_safe_strcpy()");
            exit(-1);
            }
      **dst = '\0';
      return strncat(*dst, src, n);
}

void my_alarm(Double seconds) {
#ifdef HAVE_UALARM
      ualarm( (u_int) (seconds*1e6 + 0.5), 0);
#else
      alarm( (u_int) (seconds));
#endif /* HAVE_UALARM */
}

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