1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
|
/* getifname.c -- network interface handling
* Copyright(C) 1999,2000,2001 Salvatore Sanfilippo <antirez@invece.org>
* Copyright(C) 2001 by Nicolas Jombart <Nicolas.Jombart@hsc.fr>
* This code is under the GPL license */
/* BSD support thanks to Nicolas Jombart <Nicolas.Jombart@hsc.fr> */
/* $Id: getifname.c,v 1.3 2003/10/22 10:41:00 antirez Exp $ */
#include <stdio.h> /* perror */
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h> /* struct sockaddr_in */
#include <arpa/inet.h> /* inet_ntoa */
#include <net/if.h>
#include <unistd.h> /* close */
#include <stdlib.h>
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || \
defined(__bsdi__) || defined(__APPLE__)
#include <ifaddrs.h>
#include <net/route.h>
#endif /* defined(__*BSD__) */
#include "hping2.h"
#include "globals.h"
#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && \
!defined(__linux__) && !defined(__sun__) && !defined(__bsdi__) && \
!defined(__APPLE__)
#error Sorry, interface code not implemented.
#endif
#ifdef __sun__
#include <sys/sockio.h>
#include <net/route.h>
#include <net/if_dl.h>
#endif
#if (defined OSTYPE_LINUX) || (defined __sun__)
int get_if_name(void)
{
int fd;
struct ifconf ifc;
struct ifreq ibuf[16],
ifr,
*ifrp,
*ifend;
struct sockaddr_in sa;
struct sockaddr_in output_if_addr;
int known_output_if = 0;
/* Try to get the output interface address according to
* the OS routing table */
if (ifname[0] == '\0') {
if (get_output_if(&remote, &output_if_addr) == 0) {
known_output_if = 1;
if (opt_debug)
printf("DEBUG: Output interface address: %s\n",
inet_ntoa(sa.sin_addr));
} else {
fprintf(stderr, "Warning: Unable to guess the output "
"interface\n");
}
}
if ( (fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
perror("[get_if_name] socket(AF_INET, SOCK_DGRAM, 0)");
return -1;
}
memset(ibuf, 0, sizeof(struct ifreq)*16);
ifc.ifc_len = sizeof ibuf;
ifc.ifc_buf = (caddr_t) ibuf;
/* gets interfaces list */
if ( ioctl(fd, SIOCGIFCONF, (char*)&ifc) == -1 ||
ifc.ifc_len < sizeof(struct ifreq) ) {
perror("[get_if_name] ioctl(SIOCGIFCONF)");
close(fd);
return -1;
}
/* ifrp points to buffer and ifend points to buffer's end */
ifrp = ibuf;
ifend = (struct ifreq*) ((char*)ibuf + ifc.ifc_len);
for (; ifrp < ifend; ifrp++) {
strlcpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
if ( ioctl(fd, SIOCGIFFLAGS, (char*)&ifr) == -1) {
if (opt_debug)
perror("DEBUG: [get_if_name] ioctl(SIOCGIFFLAGS)");
continue;
}
if (opt_debug)
printf("DEBUG: if %s: ", ifr.ifr_name);
/* Down interface? */
if ( !(ifr.ifr_flags & IFF_UP) )
{
if (opt_debug)
printf("DOWN\n");
continue;
}
if (known_output_if) {
/* Get the interface address */
if (ioctl(fd, SIOCGIFADDR, (char*)&ifr) == -1) {
perror("[get_if_name] ioctl(SIOCGIFADDR)");
continue;
}
/* Copy it */
memcpy(&sa, &ifr.ifr_addr,
sizeof(struct sockaddr_in));
/* Check if it is what we are locking for */
if (sa.sin_addr.s_addr !=
output_if_addr.sin_addr.s_addr) {
if (opt_debug)
printf("The address doesn't match\n");
continue;
}
} else if (ifname[0] != '\0' && !strstr(ifr.ifr_name, ifname)) {
if (opt_debug)
printf("Don't Match (but seems to be UP)\n");
continue;
}
if (opt_debug)
printf("OK\n");
/* interface found, save if name */
strlcpy(ifname, ifr.ifr_name, 1024);
/* get if address */
if ( ioctl(fd, SIOCGIFADDR, (char*)&ifr) == -1) {
perror("DEBUG: [get_if_name] ioctl(SIOCGIFADDR)");
exit(1);
}
/* save if address */
memcpy(&sa, &ifr.ifr_addr,
sizeof(struct sockaddr_in));
strlcpy(ifstraddr, inet_ntoa(sa.sin_addr), 1024);
/* get if mtu */
if ( ioctl(fd, SIOCGIFMTU, (char*)&ifr) == -1) {
perror("Warning: [get_if_name] ioctl(SIOCGIFMTU)");
fprintf(stderr, "Using a fixed MTU of 1500\n");
h_if_mtu = 1500;
}
else
{
#ifdef __sun__
/* somehow solaris is braidamaged in wrt ifr_mtu */
h_if_mtu = ifr.ifr_metric;
#else
h_if_mtu = ifr.ifr_mtu;
#endif
}
close(fd);
return 0;
}
/* interface not found, use 'lo' */
strlcpy(ifname, "lo", 1024);
strlcpy(ifstraddr, "127.0.0.1", 1024);
h_if_mtu = 1500;
close(fd);
return 0;
}
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
defined(__bsdi__) || defined(__APPLE__)
/* return interface informations :
- from the specified (-I) interface
- from the routing table
- or at least from the first UP interface found
*/
int get_if_name(void)
{
/* variable declarations */
struct ifaddrs *ifap, *ifa;
char current_if_name[24];
char saved_ifname[24];
struct sockaddr_in output_if_addr;
#ifdef __NetBSD__
int s;
struct ifreq ifr;
#endif /* __NetBSD__ */
if (getifaddrs(&ifap) < 0)
perror("getifaddrs");
saved_ifname[0] = 0;
/* lookup desired interface */
if(ifname[0] == 0) {
/* find gateway interface from kernel */
if (get_output_if(&remote, &output_if_addr) == 0) {
if (opt_debug)
printf("DEBUG: Output interface address: %s\n",
inet_ntoa(output_if_addr.sin_addr));
/* Put something in saved_ifname in order to tell
that the output adress is known */
saved_ifname[0] = 'X'; saved_ifname[1] = 0;
} else {
fprintf(stderr, "Warning: Unable to guess the output "
"interface\n");
}
}
else {
/* use the forced interface name */
strlcpy(saved_ifname,ifname,24);
}
/* get interface information */
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (opt_debug) printf("\n DEBUG: if %s: ", ifa->ifa_name);
/* print if the data structure is null or not */
if (ifa->ifa_data) {
if(opt_debug) printf("DEBUG: (struct DATA) "); }
else
if(opt_debug) printf("DEBUG: (struct DATA is NULL) ");
if (!(ifa->ifa_flags & IFF_UP)) { /* if down */
if (opt_debug)
printf("DEBUG: DOWN");
continue;
}
if ((ifa->ifa_flags & IFF_LOOPBACK)&&
(strncmp(saved_ifname,"lo0",3))) { /* if loopback */
if (opt_debug)
printf("DEBUG: LOOPBACK, SKIPPED");
continue;
}
if (ifa->ifa_addr->sa_family == AF_LINK) {
if (opt_debug)
printf("DEBUG: AF_LINK ");
strlcpy(ifname,ifa->ifa_name,1024);
strlcpy(current_if_name,ifa->ifa_name,24);
/* I don't know why NetBSD behavior is not the same */
#ifdef __NetBSD__
memset( &ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
if( sizeof(ifr.ifr_addr) >= ifa->ifa_addr->sa_len )
memcpy(&ifr.ifr_addr, ifa->ifa_addr,
ifa->ifa_addr->sa_len);
if( (s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
perror("[get_if_name] socket");
return -1;
}
if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) h_if_mtu = 0;
else h_if_mtu = ifr.ifr_mtu;
close(s);
#else
if( ifa->ifa_data )
h_if_mtu = ((struct if_data *)ifa->ifa_data)->ifi_mtu;
else {
h_if_mtu = 1500;
fprintf(stderr, "Warning: fixing MTU to 1500 !\n");
}
#endif /* __NetBSD__ */
continue;
}
if (ifa->ifa_addr->sa_family == AF_INET6) {
if (opt_debug)
printf("AF_INET6 ");
continue;
}
if (ifa->ifa_addr->sa_family == AF_INET) {
if (opt_debug)
printf("AF_INET ");
if(strncmp(ifa->ifa_name,current_if_name,24))
continue; /* error */
if(opt_debug) printf("OK\n");
strlcpy(ifstraddr,
inet_ntoa(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr),
1024);
if( (saved_ifname[0] == 0) ||
(!strncmp(ifa->ifa_name, saved_ifname, 24)) ||
(((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr ==
output_if_addr.sin_addr.s_addr) )
break; /* asked if found or first UP interface */
}
/* interface not found, use hardcoded 'lo' */
strlcpy(ifname, "lo0", 1024);
strlcpy(ifstraddr, "127.0.0.1", 1024);
h_if_mtu = 1500;
}
freeifaddrs(ifap);
return 0;
}
#endif /* __*BSD__ */
/* Try to obtain the IP address of the output interface according
* to the OS routing table. Derived from R.Stevens */
int get_output_if(struct sockaddr_in *dest, struct sockaddr_in *ifip)
{
int sock_rt, len, on=1;
struct sockaddr_in iface_out;
memset(&iface_out, 0, sizeof(iface_out));
sock_rt = socket(AF_INET, SOCK_DGRAM, 0 );
dest->sin_port = htons(11111);
if (setsockopt(sock_rt, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on))
== -1) {
if (opt_debug)
perror("DEBUG: [get_output_if] setsockopt(SOL_SOCKET, "
"SO_BROADCAST");
close(sock_rt);
return -1;
}
if (connect(sock_rt, (struct sockaddr*)dest, sizeof(struct sockaddr_in))
== -1 ) {
if (opt_debug)
perror("DEBUG: [get_output_if] connect");
close(sock_rt);
return -1;
}
len = sizeof(iface_out);
if (getsockname(sock_rt, (struct sockaddr *)&iface_out, &len) == -1 ) {
if (opt_debug)
perror("DEBUG: [get_output_if] getsockname");
close(sock_rt);
return -1;
}
close(sock_rt);
if (iface_out.sin_addr.s_addr == 0)
return 1;
memcpy(ifip, &iface_out, sizeof(struct sockaddr_in));
return 0;
}
|