348 lines
6.7 KiB
C
Executable File
348 lines
6.7 KiB
C
Executable File
/*
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add_route.c
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Created August 7, 1991 by Philip Homburg
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*/
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#define _POSIX_C_SOURCE 2
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <net/hton.h>
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#include <net/netlib.h>
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#include <net/gen/netdb.h>
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#include <net/gen/in.h>
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#include <net/gen/inet.h>
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#include <net/gen/route.h>
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#include <net/gen/socket.h>
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#include <net/gen/ip_io.h>
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static char *prog_name;
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static enum { ADD, DEL } action;
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static void usage(void);
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static int name_to_ip(char *name, ipaddr_t *addr);
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static int parse_cidr(char *cidr, ipaddr_t *addr, ipaddr_t *mask);
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int main(int argc, char *argv[])
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{
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struct netent *netent;
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ipaddr_t gateway, destination, netmask, defaultmask=0;
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u8_t high_byte;
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nwio_route_t route;
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int ip_fd, itab;
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int r;
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int metric;
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char *check;
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char *ip_device;
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char *netmask_str, *metric_str, *destination_str, *gateway_str;
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int c;
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char *d_arg, *g_arg, *m_arg, *n_arg, *I_arg;
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int i_flag, o_flag, D_flag, v_flag;
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int cidr;
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prog_name= strrchr(argv[0], '/');
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if (prog_name == NULL) prog_name= argv[0]; else prog_name++;
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if (strcmp(prog_name, "add_route") == 0)
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action= ADD;
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else if (strcmp(prog_name, "del_route") == 0)
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action= DEL;
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else
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{
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fprintf(stderr, "Don't know what to do when named '%s'\n",
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prog_name);
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exit(1);
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}
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i_flag= 0;
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o_flag= 0;
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D_flag= 0;
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v_flag= 0;
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g_arg= NULL;
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d_arg= NULL;
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m_arg= NULL;
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n_arg= NULL;
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I_arg= NULL;
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while ((c= getopt(argc, argv, "iovDg:d:m:n:I:?")) != -1)
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{
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switch(c)
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{
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case 'i':
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if (i_flag)
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usage();
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i_flag= 1;
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break;
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case 'o':
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if (o_flag)
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usage();
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o_flag= 1;
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break;
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case 'v':
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if (v_flag)
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usage();
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v_flag= 1;
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break;
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case 'D':
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if (D_flag)
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usage();
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D_flag= 1;
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break;
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case 'g':
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if (g_arg)
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usage();
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g_arg= optarg;
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break;
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case 'd':
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if (d_arg)
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usage();
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d_arg= optarg;
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break;
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case 'm':
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if (m_arg)
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usage();
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m_arg= optarg;
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break;
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case 'n':
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if (n_arg)
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usage();
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n_arg= optarg;
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break;
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case 'I':
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if (I_arg)
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usage();
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I_arg= optarg;
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break;
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case '?':
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usage();
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default:
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fprintf(stderr, "%s: getopt failed\n", prog_name);
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exit(1);
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}
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}
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if (optind != argc)
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usage();
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if (i_flag && o_flag)
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usage();
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itab= i_flag;
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if (i_flag)
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{
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if (g_arg == NULL || d_arg == NULL || m_arg == NULL)
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usage();
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}
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else
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{
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if (g_arg == NULL || (d_arg == NULL && n_arg != NULL))
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{
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usage();
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}
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}
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gateway_str= g_arg;
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destination_str= d_arg;
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metric_str= m_arg;
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netmask_str= n_arg;
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ip_device= I_arg;
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if (!name_to_ip(gateway_str, &gateway))
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{
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fprintf(stderr, "%s: unknown host '%s'\n", prog_name,
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gateway_str);
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exit(1);
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}
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destination= 0;
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netmask= 0;
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cidr= 0;
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if (destination_str)
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{
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if (parse_cidr(destination_str, &destination, &netmask))
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cidr= 1;
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else if (inet_aton(destination_str, &destination))
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;
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else if ((netent= getnetbyname(destination_str)) != NULL)
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destination= netent->n_net;
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else if (!name_to_ip(destination_str, &destination))
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{
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fprintf(stderr, "%s: unknown network/host '%s'\n",
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prog_name, destination_str);
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exit(1);
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}
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high_byte= *(u8_t *)&destination;
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if (!(high_byte & 0x80)) /* class A or 0 */
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{
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if (destination)
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defaultmask= HTONL(0xff000000);
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}
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else if (!(high_byte & 0x40)) /* class B */
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{
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defaultmask= HTONL(0xffff0000);
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}
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else if (!(high_byte & 0x20)) /* class C */
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{
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defaultmask= HTONL(0xffffff00);
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}
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else /* class D is multicast ... */
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{
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fprintf(stderr, "%s: Warning: Martian address '%s'\n",
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prog_name, inet_ntoa(destination));
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defaultmask= HTONL(0xffffffff);
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}
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if (destination & ~defaultmask)
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{
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/* host route */
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defaultmask= HTONL(0xffffffff);
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}
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if (!cidr)
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netmask= defaultmask;
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}
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if (netmask_str)
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{
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if (cidr)
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usage();
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if (inet_aton(netmask_str, &netmask) == 0)
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{
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fprintf(stderr, "%s: illegal netmask'%s'\n", prog_name,
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netmask_str);
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exit(1);
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}
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}
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if (metric_str)
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{
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metric= strtol(metric_str, &check, 0);
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if (check[0] != '\0' || metric < 1)
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{
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fprintf(stderr, "%s: illegal metric %s\n",
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prog_name, metric_str);
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}
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}
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else
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metric= 1;
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if (!ip_device)
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ip_device= getenv("IP_DEVICE");
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if (!ip_device)
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ip_device= IP_DEVICE;
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ip_fd= open(ip_device, O_RDWR);
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if (ip_fd == -1)
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{
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fprintf(stderr, "%s: unable to open('%s'): %s\n",
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prog_name, ip_device, strerror(errno));
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exit(1);
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}
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if (v_flag)
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{
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printf("%s %s route to %s ",
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action == ADD ? "adding" : "deleting",
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itab ? "input" : "output",
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inet_ntoa(destination));
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printf("with netmask %s ", inet_ntoa(netmask));
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printf("using gateway %s", inet_ntoa(gateway));
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if (itab && action == ADD)
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printf(" at distance %d", metric);
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printf("\n");
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}
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route.nwr_ent_no= 0;
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route.nwr_dest= destination;
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route.nwr_netmask= netmask;
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route.nwr_gateway= gateway;
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route.nwr_dist= action == ADD ? metric : 0;
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route.nwr_flags= (action == DEL && D_flag) ? 0 : NWRF_STATIC;
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route.nwr_pref= 0;
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route.nwr_mtu= 0;
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if (action == ADD)
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r= ioctl(ip_fd, itab ? NWIOSIPIROUTE : NWIOSIPOROUTE, &route);
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else
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r= ioctl(ip_fd, itab ? NWIODIPIROUTE : NWIODIPOROUTE, &route);
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if (r == -1)
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{
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fprintf(stderr, "%s: NWIO%cIP%cROUTE: %s\n",
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prog_name,
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action == ADD ? 'S' : 'D',
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itab ? 'I' : 'O',
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strerror(errno));
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exit(1);
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}
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return(0);
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: %s\n"
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"\t[-o] %s-g gw [-d dst [-n netmask]] %s[-I ipdev] [-v]\n"
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"\t-i %s-g gw -d dst [-n netmask] %s[-I ipdev] [-v]\n"
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"Note: <dst> may be in CIDR notation\n",
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prog_name,
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action == DEL ? "[-D] " : "",
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action == ADD ? "[-m metric] " : "",
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action == DEL ? "[-D] " : "",
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action == ADD ? "-m metric " : ""
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);
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exit(1);
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}
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static int name_to_ip(char *name, ipaddr_t *addr)
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{
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/* Translate a name to an IP address. Try first with inet_aton(), then
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* with gethostbyname(). (The latter can also recognize an IP address,
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* but only decimals with at least one dot).)
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*/
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struct hostent *hostent;
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if (!inet_aton(name, addr)) {
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if ((hostent= gethostbyname(name)) == NULL) return 0;
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if (hostent->h_addrtype != AF_INET) return 0;
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if (hostent->h_length != sizeof(*addr)) return 0;
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memcpy(addr, hostent->h_addr, sizeof(*addr));
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}
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return 1;
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}
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static int parse_cidr(char *cidr, ipaddr_t *addr, ipaddr_t *mask)
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{
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char *slash, *check;
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ipaddr_t a;
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int ok;
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unsigned long len;
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if ((slash= strchr(cidr, '/')) == NULL)
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return 0;
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*slash++= 0;
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ok= 1;
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if (!inet_aton(cidr, &a))
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ok= 0;
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len= strtoul(slash, &check, 10);
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if (check == slash || *check != 0 || len > 32)
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ok= 0;
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*--slash= '/';
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if (!ok)
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return 0;
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*addr= a;
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*mask= htonl(len == 0 ? 0 : (0xFFFFFFFF << (32-len)) & 0xFFFFFFFF);
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return 1;
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}
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/*
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* $PchId: add_route.c,v 1.6 2001/04/20 10:45:07 philip Exp $
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*/
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