442 lines
14 KiB
C
442 lines
14 KiB
C
/* route.c - Display/edit network routing table.
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*
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* Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
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* Copyright 2013 Kyungwan Han <asura321@gmail.com>
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*
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* No Standard
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*
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USE_ROUTE(NEWTOY(route, "?neA:", TOYFLAG_BIN))
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config ROUTE
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bool "route"
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default n
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help
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usage: route [-ne] [-A inet[6]] / [add|del]
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Display/Edit kernel routing tables.
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-n no name lookups
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-e display other/more information
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-A inet{6} Select Address Family
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reject mod dyn reinstate metric netmask gw mss window irtt dev
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*/
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#define FOR_route
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#include "toys.h"
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#include <net/route.h>
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GLOBALS(
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char *family;
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)
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#define DEFAULT_PREFIXLEN 128
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#define INVALID_ADDR 0xffffffffUL
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#define IPV6_ADDR_LEN 40 //32 + 7 (':') + 1 ('\0')
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struct _arglist {
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char *arg;
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int action;
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};
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static struct _arglist arglist1[] = {
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{ "add", 1 }, { "del", 2 },
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{ "delete", 2 }, { NULL, 0 }
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};
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static struct _arglist arglist2[] = {
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{ "-net", 1 }, { "-host", 2 },
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{ NULL, 0 }
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};
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// to get the host name from the given ip.
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static int get_hostname(char *ipstr, struct sockaddr_in *sockin)
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{
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struct hostent *host;
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sockin->sin_family = AF_INET;
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sockin->sin_port = 0;
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if (!strcmp(ipstr, "default")) {
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sockin->sin_addr.s_addr = INADDR_ANY;
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return 1;
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}
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if (inet_aton(ipstr, &sockin->sin_addr)) return 0;
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if (!(host = gethostbyname(ipstr))) return -1;
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memcpy(&sockin->sin_addr, host->h_addr_list[0], sizeof(struct in_addr));
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return 0;
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}
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// used to extract the address info from the given ip.
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static int get_addrinfo(char *ip, struct sockaddr_in6 *sock_in6)
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{
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struct addrinfo hints, *result;
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int status = 0;
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_INET6;
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if ((status = getaddrinfo(ip, NULL, &hints, &result))) {
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perror_msg("getaddrinfo: %s", gai_strerror(status));
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return -1;
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}
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if (result) {
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memcpy(sock_in6, result->ai_addr, sizeof(*sock_in6));
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freeaddrinfo(result);
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}
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return 0;
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}
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static void get_flag_value(char *str, int flags)
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{
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// RTF_* bits in order:
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// UP, GATEWAY, HOST, REINSTATE, DYNAMIC, MODIFIED, DEFAULT, ADDRCONF, CACHE
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int i = 0, mask = 0x105003f;
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for (; mask; mask>>=1) if (mask&1) {
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if (flags&(1<<i)) *str++ = "UGHRDMDAC"[i];
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i++;
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}
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*str = 0;
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}
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// extract inet4 route info from /proc/net/route file and display it.
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static void display_routes(void)
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{
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unsigned long dest, gate, mask;
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int flags, ref, use, metric, mss, win, irtt, items;
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char iface[64] = {0,}, flag_val[10]; //there are 9 flags "UGHRDMDAC" for route.
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FILE *fp = xfopen("/proc/net/route", "r");
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xprintf("Kernel IP routing table\n"
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"Destination Gateway Genmask Flags %s Iface\n",
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(toys.optflags & FLAG_e)? " MSS Window irtt" : "Metric Ref Use");
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if (fscanf(fp, "%*[^\n]\n") < 0) perror_exit("fscanf"); //skip 1st line
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while ((items = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n", iface, &dest,
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&gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt)) == 11)
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{
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char *destip = toybuf, *gateip = toybuf+32, *maskip = toybuf+64; //ip string 16
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if (!(flags & RTF_UP)) continue; //skip down interfaces.
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if (!dest && !(toys.optflags & FLAG_n)) strcpy( destip, "default");
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else if (!inet_ntop(AF_INET, &dest, destip, 32)) perror_exit("inet");
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if (!gate && !(toys.optflags & FLAG_n)) strcpy( gateip, "*");
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else if (!inet_ntop(AF_INET, &gate, gateip, 32)) perror_exit("inet");
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if (!inet_ntop(AF_INET, &mask, maskip, 32)) perror_exit("inet");
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//Get flag Values
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get_flag_value(flag_val, flags);
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if (flags & RTF_REJECT) flag_val[0] = '!';
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xprintf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val);
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if (toys.optflags & FLAG_e) xprintf("%5d %-5d %6d %s\n", mss, win, irtt, iface);
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else xprintf("%-6d %-2d %7d %s\n", metric, ref, use, iface);
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}
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if (items > 0 && feof(fp)) perror_exit("fscanf %d", items);
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fclose(fp);
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}
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/*
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* find the given parameter in list like add/del/net/host.
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* and if match found return the appropriate action.
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*/
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static int get_action(char ***argv, struct _arglist *list)
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{
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struct _arglist *alist;
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if (!**argv) return 0;
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for (alist = list; alist->arg; alist++) { //find the given parameter in list
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if (!strcmp(**argv, alist->arg)) {
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*argv += 1;
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return alist->action;
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}
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}
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return 0;
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}
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/*
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* get prefix len (if any) and remove the prefix from target ip.
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* if no prefix then set netmask as default.
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*/
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static void is_prefix(char **tip, char **netmask, struct rtentry *rt)
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{
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char *prefix = strchr(*tip, '/');
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if (prefix) {
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unsigned long plen;
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plen = atolx_range(prefix + 1, 0, 32);
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//used to verify the netmask and route conflict.
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(((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr)
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= htonl( ~(INVALID_ADDR >> plen));
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*prefix = '\0';
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rt->rt_genmask.sa_family = AF_INET;
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} else *netmask = "default"; //default netmask.
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}
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/*
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* used to get the params like: metric, netmask, gw, mss, window, irtt, dev and their values.
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* additionally set the flag values for reject, mod, dyn and reinstate.
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*/
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static void get_next_params(char **argv, struct rtentry *rt, char **netmask)
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{
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for (;*argv;argv++) {
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if (!strcmp(*argv, "reject")) rt->rt_flags |= RTF_REJECT;
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else if (!strcmp(*argv, "mod")) rt->rt_flags |= RTF_MODIFIED;
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else if (!strcmp(*argv, "dyn")) rt->rt_flags |= RTF_DYNAMIC;
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else if (!strcmp(*argv, "reinstate")) rt->rt_flags |= RTF_REINSTATE;
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else {
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if (!argv[1]) help_exit(0);
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//set the metric field in the routing table.
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if (!strcmp(*argv, "metric"))
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rt->rt_metric = atolx_range(*argv, 0, ULONG_MAX) + 1;
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else if (!strcmp(*argv, "netmask")) {
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//when adding a network route, the netmask to be used.
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struct sockaddr sock;
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unsigned int addr_mask = (((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr);
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if (addr_mask) help_exit("dup netmask");
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*netmask = *argv;
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if (get_hostname(*netmask, (struct sockaddr_in *) &sock) < 0)
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perror_exit("resolving '%s'", *netmask);
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rt->rt_genmask = sock;
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} else if (!strcmp(*argv, "gw")) {
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//route packets via a gateway.
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if (!(rt->rt_flags & RTF_GATEWAY)) {
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int ishost;
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if ((ishost = get_hostname(*argv, (struct sockaddr_in *) &rt->rt_gateway)) == 0) {
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rt->rt_flags |= RTF_GATEWAY;
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} else if (ishost < 0) perror_exit("resolving '%s'", *argv);
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else perror_exit("gateway '%s' is a NETWORK", *argv);
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} else help_exit("dup gw");
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} else if (!strcmp(*argv, "mss")) {
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//set the TCP Maximum Segment Size for connections over this route.
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rt->rt_mss = atolx_range(*argv, 64, 32768); //MSS low and max
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rt->rt_flags |= RTF_MSS;
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} else if (!strcmp(*argv, "window")) {
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//set the TCP window size for connections over this route to W bytes.
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rt->rt_window = atolx_range(*argv, 128, INT_MAX); //win low
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rt->rt_flags |= RTF_WINDOW;
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} else if (!strcmp(*argv, "irtt")) {
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rt->rt_irtt = atolx_range(*argv, 0, INT_MAX);
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rt->rt_flags |= RTF_IRTT;
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} else if (!strcmp(*argv, "dev") && !rt->rt_dev) rt->rt_dev = *argv;
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else help_exit("no '%s'", *argv);
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}
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}
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if (!rt->rt_dev && (rt->rt_flags & RTF_REJECT)) rt->rt_dev = (char *)"lo";
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}
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// verify the netmask and conflict in netmask and route address.
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static void verify_netmask(struct rtentry *rt, char *netmask)
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{
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unsigned int addr_mask = (((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr);
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unsigned int router_addr = ~(unsigned int)(((struct sockaddr_in *)&((rt)->rt_dst))->sin_addr.s_addr);
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if (addr_mask) {
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addr_mask = ~ntohl(addr_mask);
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if ((rt->rt_flags & RTF_HOST) && addr_mask != INVALID_ADDR)
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perror_exit("conflicting netmask and host route");
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if (addr_mask & (addr_mask + 1)) perror_exit("wrong netmask '%s'", netmask);
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addr_mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr;
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if (addr_mask & router_addr) perror_exit("conflicting netmask and route address");
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}
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}
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// add/del a route.
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static void setroute(char **argv)
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{
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struct rtentry rt;
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char *netmask = NULL, *targetip;
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int is_net_or_host = 0, sokfd, arg2_action;
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int action = get_action(&argv, arglist1); //verify the arg for add/del.
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if (!action || !*argv) help_exit("setroute");
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arg2_action = get_action(&argv, arglist2); //verify the arg for -net or -host
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if (!*argv) help_exit("setroute");
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memset(&rt, 0, sizeof(struct rtentry));
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targetip = *argv++;
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is_prefix((char **)&targetip, (char **)&netmask, &rt);
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if ((is_net_or_host = get_hostname(targetip,
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(struct sockaddr_in *) &rt.rt_dst)) < 0)
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perror_exit("resolving '%s'", targetip);
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if (arg2_action) is_net_or_host = arg2_action & 1;
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rt.rt_flags = ((is_net_or_host) ? RTF_UP : (RTF_UP | RTF_HOST));
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get_next_params(argv, &rt, (char **)&netmask);
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verify_netmask(&rt, (char *)netmask);
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if ((action == 1) && (rt.rt_flags & RTF_HOST))
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(((struct sockaddr_in *)&((rt).rt_genmask))->sin_addr.s_addr) = INVALID_ADDR;
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sokfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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if (action == 1) xioctl(sokfd, SIOCADDRT, &rt);
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else xioctl(sokfd, SIOCDELRT, &rt);
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xclose(sokfd);
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}
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/*
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* get prefix len (if any) and remove the prefix from target ip.
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* if no prefix then set default prefix len.
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*/
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static void is_prefix_inet6(char **tip, struct in6_rtmsg *rt)
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{
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unsigned long plen;
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char *prefix = strchr(*tip, '/');
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if (prefix) {
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*prefix = '\0';
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plen = atolx_range(prefix + 1, 0, 128); //DEFAULT_PREFIXLEN);
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} else plen = DEFAULT_PREFIXLEN;
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rt->rtmsg_flags = (plen == DEFAULT_PREFIXLEN) ? (RTF_UP | RTF_HOST) : RTF_UP;
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rt->rtmsg_dst_len = plen;
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}
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/*
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* used to get the params like: metric, gw, dev and their values.
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* additionally set the flag values for mod and dyn.
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*/
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static void get_next_params_inet6(char **argv, struct sockaddr_in6 *sock_in6, struct in6_rtmsg *rt, char **dev_name)
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{
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for (;*argv;argv++) {
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if (!strcmp(*argv, "mod")) rt->rtmsg_flags |= RTF_MODIFIED;
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else if (!strcmp(*argv, "dyn")) rt->rtmsg_flags |= RTF_DYNAMIC;
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else {
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if (!argv[1]) help_exit(0);
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if (!strcmp(*argv, "metric"))
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rt->rtmsg_metric = atolx_range(*argv, 0, ULONG_MAX);
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else if (!strcmp(*argv, "gw")) {
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//route packets via a gateway.
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if (!(rt->rtmsg_flags & RTF_GATEWAY)) {
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if (!get_addrinfo(*argv, (struct sockaddr_in6 *) &sock_in6)) {
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memcpy(&rt->rtmsg_gateway, sock_in6->sin6_addr.s6_addr, sizeof(struct in6_addr));
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rt->rtmsg_flags |= RTF_GATEWAY;
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} else perror_exit("resolving '%s'", *argv);
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} else help_exit(0);
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} else if (!strcmp(*argv, "dev")) {
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if (!*dev_name) *dev_name = *argv;
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} else help_exit(0);
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}
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}
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}
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// add/del a route.
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static void setroute_inet6(char **argv)
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{
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struct sockaddr_in6 sock_in6;
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struct in6_rtmsg rt;
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char *targetip, *dev_name = 0;
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int sockfd, action = get_action(&argv, arglist1);
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if (!action || !*argv) help_exit(0);
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memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
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memset(&rt, 0, sizeof(struct in6_rtmsg));
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targetip = *argv++;
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if (!*argv) help_exit(0);
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if (!strcmp(targetip, "default")) {
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rt.rtmsg_flags = RTF_UP;
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rt.rtmsg_dst_len = 0;
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} else {
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is_prefix_inet6((char **)&targetip, &rt);
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if (get_addrinfo(targetip, (struct sockaddr_in6 *) &sock_in6))
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perror_exit("resolving '%s'", targetip);
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}
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rt.rtmsg_metric = 1; //default metric.
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memcpy(&rt.rtmsg_dst, sock_in6.sin6_addr.s6_addr, sizeof(struct in6_addr));
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get_next_params_inet6(argv, &sock_in6, &rt, (char **)&dev_name);
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sockfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
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if (dev_name) {
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char ifre_buf[sizeof(struct ifreq)] = {0,};
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struct ifreq *ifre = (struct ifreq*)ifre_buf;
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xstrncpy(ifre->ifr_name, dev_name, IFNAMSIZ);
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xioctl(sockfd, SIOGIFINDEX, ifre);
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rt.rtmsg_ifindex = ifre->ifr_ifindex;
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}
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if (action == 1) xioctl(sockfd, SIOCADDRT, &rt);
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else xioctl(sockfd, SIOCDELRT, &rt);
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xclose(sockfd);
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}
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/*
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* format the dest and src address in ipv6 format.
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* e.g. 2002:6b6d:26c8:d:ea03:9aff:fe65:9d62
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*/
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static void ipv6_addr_formating(char *ptr, char *addr)
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{
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int i = 0;
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while (i <= IPV6_ADDR_LEN) {
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if (!*ptr) {
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if (i == IPV6_ADDR_LEN) {
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addr[IPV6_ADDR_LEN - 1] = 0; //NULL terminating the ':' seperated address.
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break;
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}
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error_exit("IPv6 ip format error");
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}
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addr[i++] = *ptr++;
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if (!((i+1) % 5)) addr[i++] = ':'; //put ':' after 4th bit
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}
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}
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static void display_routes6(void)
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{
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char iface[16] = {0,}, ipv6_dest_addr[41];
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char ipv6_src_addr[41], flag_val[10], buf2[INET6_ADDRSTRLEN];
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int prefixlen, metric, use, refcount, flag, items = 0;
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unsigned char buf[sizeof(struct in6_addr)];
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FILE *fp = xfopen("/proc/net/ipv6_route", "r");
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xprintf("Kernel IPv6 routing table\n"
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"%-43s%-40s Flags Metric Ref Use Iface\n", "Destination", "Next Hop");
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while ((items = fscanf(fp, "%32s%x%*s%*x%32s%x%x%x%x%10s\n", ipv6_dest_addr+8,
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&prefixlen, ipv6_src_addr+8, &metric, &use, &refcount, &flag,
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iface)) == 8)
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{
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if (!(flag & RTF_UP)) continue; //skip down interfaces.
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//ipv6_dest_addr+8: as the values are filled from the 8th location of the array.
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ipv6_addr_formating(ipv6_dest_addr+8, ipv6_dest_addr);
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ipv6_addr_formating(ipv6_src_addr+8, ipv6_src_addr);
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get_flag_value(flag_val, flag);
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if (inet_pton(AF_INET6, ipv6_dest_addr, buf) <= 0) perror_exit("inet");
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if (inet_ntop(AF_INET6, buf, buf2, INET6_ADDRSTRLEN))
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sprintf(toybuf, "%s/%d", buf2, prefixlen);
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if (inet_pton(AF_INET6, ipv6_src_addr, buf) <= 0) perror_exit("inet");
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if (inet_ntop(AF_INET6, buf, buf2, INET6_ADDRSTRLEN))
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xprintf("%-43s %-39s %-5s %-6d %-4d %5d %-8s\n",
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toybuf, buf2, flag_val, metric, refcount, use, iface);
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}
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if ((items > 0) && feof(fp)) perror_exit("fscanf");
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fclose(fp);
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}
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void route_main(void)
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{
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if (!TT.family) TT.family = "inet";
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if (!*toys.optargs) {
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if (!strcmp(TT.family, "inet")) display_routes();
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else if (!strcmp(TT.family, "inet6")) display_routes6();
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else help_exit(0);
|
|
} else {
|
|
if (!strcmp(TT.family, "inet6")) setroute_inet6(toys.optargs);
|
|
else setroute(toys.optargs);
|
|
}
|
|
}
|