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Annotation of embedaddon/libnet/src/libnet_link_snoop.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *  $Id: libnet_link_snoop.c,v 1.5 2004/01/03 20:31:02 mike Exp $
                      3:  *
                      4:  *  libnet
                      5:  *  libnet_snoop.c - snoop routines
                      6:  *
                      7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
                      8:  *  All rights reserved.
                      9:  *
                     10:  * Copyright (c) 1993, 1994, 1995, 1996, 1997
                     11:  *     The Regents of the University of California.  All rights reserved.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that: (1) source code distributions
                     15:  * retain the above copyright notice and this paragraph in its entirety, (2)
                     16:  * distributions including binary code include the above copyright notice and
                     17:  * this paragraph in its entirety in the documentation or other materials
                     18:  * provided with the distribution, and (3) all advertising materials mentioning
                     19:  * features or use of this software display the following acknowledgement:
                     20:  * ``This product includes software developed by the University of California,
                     21:  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
                     22:  * the University nor the names of its contributors may be used to endorse
                     23:  * or promote products derived from this software without specific prior
                     24:  * written permission.
                     25:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     26:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     27:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     28:  */
                     29: 
                     30: #include <sys/param.h>
                     31: #include <sys/file.h>
                     32: 
                     33: #if (HAVE_CONFIG_H)
                     34: #include "../include/config.h"
                     35: #endif
                     36: #include "../include/libnet.h"
                     37: 
                     38: #include <net/raw.h>
                     39: #include <net/if.h>
                     40: 
                     41: #include <netinet/ip_var.h>
                     42: #include <netinet/if_ether.h>
                     43: #include <netinet/udp_var.h>
                     44: #include <netinet/tcpip.h>
                     45: 
                     46: #include "../include/gnuc.h"
                     47: #include "../include/bpf.h"
                     48: #ifdef HAVE_OS_PROTO_H
                     49: #include "../include/os-proto.h"
                     50: #endif
                     51: 
                     52: 
                     53: struct libnet_link_int *
                     54: libnet_open_link_interface(int8_t *device, int8_t *ebuf)
                     55: {
                     56:     int fd;
                     57:     struct sockaddr_raw sr;
                     58:     u_int v;
                     59:     struct libnet_link_int *l;
                     60: 
                     61:     l = (struct libnet_link_int *)malloc(sizeof(*l));
                     62:     if (l == NULL)
                     63:     {
                     64:         sprintf(ebuf, "malloc: %s", strerror(errno));
                     65:         return (NULL);
                     66:     }
                     67:     memset(l, 0, sizeof(*l));
                     68:     l->fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_DRAIN);
                     69:     if (l->fd < 0)
                     70:     {
                     71:         sprintf(ebuf, "drain socket: %s", strerror(errno));
                     72:         goto bad;
                     73:     }
                     74: 
                     75:     memset(&sr, 0, sizeof(sr));
                     76:     sr.sr_family = AF_RAW;
                     77:        strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname) - 1);
                     78:     sr.sr_name[sizeof(sr.sr_name) - 1] = '\0';
                     79: 
                     80:     if (bind(l->fd, (struct sockaddr *)&sr, sizeof(sr)))
                     81:     {
                     82:         sprintf(ebuf, "drain bind: %s", strerror(errno));
                     83:         goto bad;
                     84:     }
                     85: 
                     86:     /*
                     87:      * XXX hack - map device name to link layer type
                     88:      */
                     89:     if (strncmp("et", device, 2) == 0      ||    /* Challenge 10 Mbit */
                     90:            strncmp("ec", device, 2) == 0  ||    /* Indigo/Indy 10 Mbit, O2 10/100 */
                     91:             strncmp("ef", device, 2) == 0 ||    /* O200/2000 10/100 Mbit */
                     92:             strncmp("gfe", device, 3) == 0 ||   /* GIO 100 Mbit */
                     93:             strncmp("fxp", device, 3) == 0 ||   /* Challenge VME Enet */
                     94:             strncmp("ep", device, 2) == 0 ||    /* Challenge 8x10 Mbit EPLEX */
                     95:             strncmp("vfe", device, 3) == 0 ||   /* Challenge VME 100Mbit */
                     96:             strncmp("fa", device, 2) == 0 ||
                     97:             strncmp("qaa", device, 3) == 0)
                     98:     {
                     99:         l->linktype = DLT_EN10MB;
                    100:     }
                    101:     else if (strncmp("ipg", device, 3) == 0 ||
                    102:             strncmp("rns", device, 3) == 0 ||  /* O2/200/2000 FDDI */
                    103:             strncmp("xpi", device, 3) == 0)
                    104:         {
                    105:             l->linktype = DLT_FDDI;
                    106:        }
                    107:     else if (strncmp("ppp", device, 3) == 0) {
                    108:                l->linktype = DLT_RAW;
                    109:        } else if (strncmp("lo", device, 2) == 0) {
                    110:                l->linktype = DLT_NULL;
                    111:        } else {
                    112:                sprintf(ebuf, "drain: unknown physical layer type");
                    113:                goto bad;
                    114:        }
                    115: 
                    116:        return (l);
                    117:  bad:
                    118:        close(fd);
                    119:        free(l);
                    120:        return (NULL);
                    121: }
                    122: 
                    123: 
                    124: int
                    125: libnet_close_link_interface(struct libnet_link_int *l)
                    126: {
                    127:     if (close(l->fd) == 0)
                    128:     {
                    129:         free(l);
                    130:         return (1);
                    131:     }
                    132:     else
                    133:     {
                    134:         free(l);
                    135:         return (-1);
                    136:     }
                    137: }
                    138: 
                    139: 
                    140: int
                    141: libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device,
                    142:             u_int8_t *buf, int len)
                    143: {
                    144:     int c;
                    145:     struct ifreq ifr;
                    146:     struct ether_header *eh = (struct ether_header *)buf;
                    147:   
                    148:     memset(&ifr, 0, sizeof(ifr));
                    149:     strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
                    150:   
                    151:     if (ioctl(l->fd, SIOCGIFADDR, &ifr) == -1)
                    152:     {
                    153:         perror("ioctl SIOCGIFADDR");
                    154:         return (-1);
                    155:     }
                    156:   
                    157:     memcpy(eh->ether_shost, ifr.ifr_addr.sa_data, sizeof(eh->ether_shost));
                    158:   
                    159:     if (write(l->fd, buf, len) == -1)
                    160:     {
                    161:         /* err */
                    162:         return (-1);
                    163:     }
                    164: 
                    165:     return (len);
                    166: }