| /* route.c - Display routing table. |
| * |
| * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com> |
| * Copyright 2013 Kyungwan Han <asura321@gmail.com> |
| * |
| * No Standard |
| * |
| USE_ROUTE(NEWTOY(route, "?neA:", TOYFLAG_BIN)) |
| config ROUTE |
| bool "route" |
| default n |
| help |
| usage: route -neA inet{6} / [{add|del}] |
| |
| Display/Edit kernel routing tables. |
| |
| -n Don't resolve names |
| -e Display other/more information |
| -A inet{6} Select Address Family |
| */ |
| |
| #define FOR_route |
| #include "toys.h" |
| #include <net/route.h> |
| #include <sys/param.h> |
| |
| GLOBALS( |
| char *family; |
| ) |
| |
| #define DEFAULT_PREFIXLEN 128 |
| #define INVALID_ADDR 0xffffffffUL |
| #define IPV6_ADDR_LEN 40 //32 + 7 (':') + 1 ('\0') |
| |
| #define TEST_ARGV(argv) if (!*argv) show_route_help() |
| |
| struct _arglist { |
| char *arg; |
| int action; |
| }; |
| |
| static struct _arglist arglist1[] = { |
| { "add", 1 }, { "del", 2 }, |
| { "delete", 2 }, { NULL, 0 } |
| }; |
| |
| static struct _arglist arglist2[] = { |
| { "-net", 1 }, { "-host", 2 }, |
| { NULL, 0 } |
| }; |
| |
| // display help info and exit. |
| static void show_route_help(void) |
| { |
| toys.exithelp = 1; |
| error_exit("Invalid Argument"); |
| } |
| |
| // to get the host name from the given ip. |
| static int get_hostname(char *ipstr, struct sockaddr_in *sockin) |
| { |
| struct hostent *host; |
| |
| sockin->sin_family = AF_INET; |
| sockin->sin_port = 0; |
| |
| if (!strcmp(ipstr, "default")) { |
| sockin->sin_addr.s_addr = INADDR_ANY; |
| return 1; |
| } |
| |
| if (inet_aton(ipstr, &sockin->sin_addr)) return 0; |
| if (!(host = gethostbyname(ipstr))) return -1; |
| memcpy(&sockin->sin_addr, host->h_addr_list[0], sizeof(struct in_addr)); |
| return 0; |
| } |
| |
| // used to extract the address info from the given ip. |
| static int get_addrinfo(char *ip, struct sockaddr_in6 *sock_in6) |
| { |
| struct addrinfo hints, *result; |
| int status = 0; |
| |
| memset(&hints, 0, sizeof(struct addrinfo)); |
| hints.ai_family = AF_INET6; |
| if ((status = getaddrinfo(ip, NULL, &hints, &result))) { |
| perror_msg("getaddrinfo: %s", gai_strerror(status)); |
| return -1; |
| } |
| if (result) { |
| memcpy(sock_in6, result->ai_addr, sizeof(*sock_in6)); |
| freeaddrinfo(result); |
| } |
| return 0; |
| } |
| |
| //get the flag values for route command. |
| static void get_flag_value(char *str, int flags) |
| { |
| int i = 0; |
| static unsigned flagarray[] = { |
| RTF_GATEWAY, RTF_HOST, RTF_REINSTATE, RTF_DYNAMIC, |
| RTF_MODIFIED, RTF_DEFAULT, RTF_ADDRCONF, RTF_CACHE |
| }; |
| |
| *str++ = 'U'; |
| while ((*str = "GHRDMDAC"[i])) |
| if (flags & flagarray[i++]) ++str; |
| } |
| |
| // extract inet4 route info from /proc/net/route file and display it. |
| static void display_routes(void) |
| { |
| unsigned long dest, gate, mask; |
| int flags, ref, use, metric, mss, win, irtt, items; |
| char iface[64] = {0,}, flag_val[10]; //there are 9 flags "UGHRDMDAC" for route. |
| |
| FILE *fp = xfopen("/proc/net/route", "r"); |
| |
| xprintf("Kernel IP routing table\n" |
| "Destination Gateway Genmask Flags %s Iface\n", |
| (toys.optflags & FLAG_e)? " MSS Window irtt" : "Metric Ref Use"); |
| |
| if (fscanf(fp, "%*[^\n]\n") < 0) perror_exit("fscanf"); //skip 1st line |
| while ((items = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n", iface, &dest, |
| &gate, &flags, &ref, &use, &metric, &mask, &mss, &win, &irtt)) == 11) { |
| |
| char *destip = toybuf, *gateip = toybuf+32, *maskip = toybuf+64; //ip string 16 |
| memset(flag_val, 0, 10); |
| |
| if (!(flags & RTF_UP)) continue; //skip down interfaces. |
| |
| if (!dest && !(toys.optflags & FLAG_n)) strcpy( destip, "default"); |
| else if (!inet_ntop(AF_INET, &dest, destip, 32)) perror_exit("inet"); |
| |
| if (!gate && !(toys.optflags & FLAG_n)) strcpy( gateip, "*"); |
| else if (!inet_ntop(AF_INET, &gate, gateip, 32)) perror_exit("inet"); |
| |
| if (!inet_ntop(AF_INET, &mask, maskip, 32)) perror_exit("inet"); |
| |
| //Get flag Values |
| get_flag_value(flag_val, (flags & (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE |
| |RTF_DYNAMIC|RTF_MODIFIED))); |
| if (flags & RTF_REJECT) flag_val[0] = '!'; |
| xprintf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, maskip, flag_val); |
| if (toys.optflags & FLAG_e) xprintf("%5d %-5d %6d %s\n", mss, win, irtt, iface); |
| else xprintf("%-6d %-2d %7d %s\n", metric, ref, use, iface); |
| } |
| |
| if (items > 0 && feof(fp)) perror_exit("fscanf %d", items); |
| fclose(fp); |
| } |
| |
| |
| /* |
| * find the given parameter in list like add/del/net/host. |
| * and if match found return the appropriate action. |
| */ |
| static int get_action(char ***argv, struct _arglist *list) |
| { |
| struct _arglist *alist; |
| |
| if (!**argv) return 0; |
| for (alist = list; alist->arg; alist++) { //find the given parameter in list |
| if (!strcmp(**argv, alist->arg)) { |
| *argv += 1; |
| return alist->action; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * get prefix len (if any) and remove the prefix from target ip. |
| * if no prefix then set netmask as default. |
| */ |
| static void is_prefix(char **tip, char **netmask, struct rtentry *rt) |
| { |
| char *prefix = strchr(*tip, '/'); |
| if (prefix) { |
| unsigned long plen; |
| plen = atolx_range(prefix + 1, 0, 32); |
| //used to verify the netmask and route conflict. |
| (((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr) |
| = htonl( ~(INVALID_ADDR >> plen)); |
| *prefix = '\0'; |
| rt->rt_genmask.sa_family = AF_INET; |
| } else *netmask = "default"; //default netmask. |
| } |
| |
| /* |
| * used to get the params like: metric, netmask, gw, mss, window, irtt, dev and their values. |
| * additionally set the flag values for reject, mod, dyn and reinstate. |
| */ |
| static void get_next_params(char **argv, struct rtentry *rt, char **netmask) |
| { |
| while (*argv) { |
| //set the metric field in the routing table. |
| if (!strcmp(*argv, "metric")) { |
| argv++; |
| TEST_ARGV(argv); |
| rt->rt_metric = atolx_range(*argv, 0, ULONG_MAX) + 1; |
| argv++; |
| } else if (!strcmp(*argv, "netmask")) { |
| //when adding a network route, the netmask to be used. |
| struct sockaddr sock; |
| unsigned int addr_mask = (((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr); |
| if (addr_mask) show_route_help(); |
| argv++; |
| TEST_ARGV(argv); |
| *netmask = *argv; |
| if (get_hostname(*netmask, (struct sockaddr_in *) &sock) < 0) |
| perror_exit("resolving '%s'", *netmask); |
| rt->rt_genmask = sock; |
| argv++; |
| } else if (!strcmp(*argv, "gw")) { |
| //route packets via a gateway. |
| if (!(rt->rt_flags & RTF_GATEWAY)) { |
| int ishost; |
| argv++; |
| TEST_ARGV(argv); |
| if ((ishost = get_hostname(*argv, (struct sockaddr_in *) &rt->rt_gateway)) == 0) { |
| rt->rt_flags |= RTF_GATEWAY; |
| argv++; |
| } else if (ishost < 0) perror_exit("resolving '%s'", *argv); |
| else perror_exit("gateway '%s' is a NETWORK", *argv); |
| } else show_route_help(); |
| } else if (!strcmp(*argv, "mss")) { |
| //set the TCP Maximum Segment Size for connections over this route. |
| argv++; |
| TEST_ARGV(argv); |
| rt->rt_mss = atolx_range(*argv, 64, 32768); //MSS low and max |
| rt->rt_flags |= RTF_MSS; |
| argv++; |
| } else if (!strcmp(*argv, "window")) { |
| //set the TCP window size for connections over this route to W bytes. |
| argv++; |
| TEST_ARGV(argv); |
| rt->rt_window = atolx_range(*argv, 128, INT_MAX); //win low |
| rt->rt_flags |= RTF_WINDOW; |
| argv++; |
| } else if (!strcmp(*argv, "irtt")) { |
| long nclock_ticks = sysconf(_SC_CLK_TCK); //number of clock ticks per second. |
| argv++; |
| TEST_ARGV(argv); |
| nclock_ticks /= 100; |
| rt->rt_irtt = strtoul(*argv, NULL, 10); |
| if (nclock_ticks > 0) rt->rt_irtt *= nclock_ticks; |
| rt->rt_flags |= 0x0100; //RTF_IRTT |
| argv++; |
| } else if (!strcmp(*argv, "dev")) { |
| argv++; |
| TEST_ARGV(argv); |
| if ((!rt->rt_dev)) rt->rt_dev = *argv; |
| argv++; |
| } else if (!strcmp(*argv, "reject")) { |
| rt->rt_flags |= RTF_REJECT; |
| argv++; |
| } else if (!strcmp(*argv, "mod")) { |
| rt->rt_flags |= RTF_MODIFIED; |
| argv++; |
| } else if (!strcmp(*argv, "dyn")) { |
| rt->rt_flags |= RTF_DYNAMIC; |
| argv++; |
| } else if (!strcmp(*argv, "reinstate")) { |
| rt->rt_flags |= RTF_REINSTATE; |
| argv++; |
| } else show_route_help(); //No match found; exit form the application. |
| }//end of while loop. |
| |
| if (!rt->rt_dev && (rt->rt_flags & RTF_REJECT)) rt->rt_dev = (char *)"lo"; |
| } |
| |
| // verify the netmask and conflict in netmask and route address. |
| static void verify_netmask(struct rtentry *rt, char *netmask) |
| { |
| unsigned int addr_mask = (((struct sockaddr_in *)&((rt)->rt_genmask))->sin_addr.s_addr); |
| unsigned int router_addr = ~(unsigned int)(((struct sockaddr_in *)&((rt)->rt_dst))->sin_addr.s_addr); |
| |
| if (addr_mask) { |
| addr_mask = ~ntohl(addr_mask); |
| if ((rt->rt_flags & RTF_HOST) && addr_mask != INVALID_ADDR) |
| perror_exit("conflicting netmask and host route"); |
| if (addr_mask & (addr_mask + 1)) perror_exit("wrong netmask '%s'", netmask); |
| addr_mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr; |
| if (addr_mask & router_addr) perror_exit("conflicting netmask and route address"); |
| } |
| } |
| |
| // add/del a route. |
| static void setroute(char **argv) |
| { |
| struct rtentry rt; |
| char *netmask = NULL, *targetip; |
| int is_net_or_host = 0, sokfd, arg2_action; |
| int action = get_action(&argv, arglist1); //verify the arg for add/del. |
| |
| if (!action || !*argv) show_route_help(); |
| |
| arg2_action = get_action(&argv, arglist2); //verify the arg for -net or -host |
| if (!*argv) show_route_help(); |
| |
| memset(&rt, 0, sizeof(struct rtentry)); |
| targetip = *argv++; |
| |
| is_prefix((char **)&targetip, (char **)&netmask, &rt); |
| if ((is_net_or_host = get_hostname(targetip, |
| (struct sockaddr_in *) &rt.rt_dst)) < 0) |
| perror_exit("resolving '%s'", targetip); |
| |
| if (arg2_action) is_net_or_host = arg2_action & 1; |
| rt.rt_flags = ((is_net_or_host) ? RTF_UP : (RTF_UP | RTF_HOST)); |
| |
| get_next_params(argv, &rt, (char **)&netmask); |
| verify_netmask(&rt, (char *)netmask); |
| |
| if ((action == 1) && (rt.rt_flags & RTF_HOST)) |
| (((struct sockaddr_in *)&((rt).rt_genmask))->sin_addr.s_addr) = INVALID_ADDR; |
| |
| sokfd = xsocket(AF_INET, SOCK_DGRAM, 0); |
| if (action == 1) xioctl(sokfd, SIOCADDRT, &rt); |
| else xioctl(sokfd, SIOCDELRT, &rt); |
| xclose(sokfd); |
| } |
| |
| /* |
| * get prefix len (if any) and remove the prefix from target ip. |
| * if no prefix then set default prefix len. |
| */ |
| static void is_prefix_inet6(char **tip, struct in6_rtmsg *rt) |
| { |
| unsigned long plen; |
| char *prefix = strchr(*tip, '/'); |
| |
| if (prefix) { |
| *prefix = '\0'; |
| plen = atolx_range(prefix + 1, 0, 128); //DEFAULT_PREFIXLEN); |
| } else plen = DEFAULT_PREFIXLEN; |
| |
| rt->rtmsg_flags = (plen == DEFAULT_PREFIXLEN) ? (RTF_UP | RTF_HOST) : RTF_UP; |
| rt->rtmsg_dst_len = plen; |
| } |
| |
| /* |
| * used to get the params like: metric, gw, dev and their values. |
| * additionally set the flag values for mod and dyn. |
| */ |
| static void get_next_params_inet6(char **argv, struct sockaddr_in6 *sock_in6, struct in6_rtmsg *rt, char **dev_name) |
| { |
| while (*argv) { |
| if (!strcmp(*argv, "metric")) { |
| //set the metric field in the routing table. |
| argv++; |
| TEST_ARGV(argv); |
| rt->rtmsg_metric = atolx_range(*argv, 0, ULONG_MAX); |
| argv++; |
| } else if (!strcmp(*argv, "gw")) { |
| //route packets via a gateway. |
| if (!(rt->rtmsg_flags & RTF_GATEWAY)) { |
| argv++; |
| TEST_ARGV(argv); |
| if (!get_addrinfo(*argv, (struct sockaddr_in6 *) &sock_in6)) { |
| memcpy(&rt->rtmsg_gateway, sock_in6->sin6_addr.s6_addr, sizeof(struct in6_addr)); |
| rt->rtmsg_flags |= RTF_GATEWAY; |
| argv++; |
| } else perror_exit("resolving '%s'", *argv); |
| } else show_route_help(); |
| } else if (!strcmp(*argv, "dev")) { |
| argv++; |
| TEST_ARGV(argv); |
| if (!*dev_name) *dev_name = *argv; |
| argv++; |
| } else if (!strcmp(*argv, "mod")) { |
| rt->rtmsg_flags |= RTF_MODIFIED; |
| argv++; |
| } else if (!strcmp(*argv, "dyn")) { |
| rt->rtmsg_flags |= RTF_DYNAMIC; |
| argv++; |
| } else show_route_help(); |
| }//end of while loop. |
| } |
| |
| // add/del a route. |
| static void setroute_inet6(char **argv) |
| { |
| struct sockaddr_in6 sock_in6; |
| struct in6_rtmsg rt; |
| char *targetip; |
| int sockfd, action = get_action(&argv, arglist1); |
| |
| if (!action || !*argv) show_route_help(); |
| memset(&sock_in6, 0, sizeof(struct sockaddr_in6)); |
| memset(&rt, 0, sizeof(struct in6_rtmsg)); |
| targetip = *argv++; |
| if (*argv) { |
| unsigned long plen = 0; |
| char *dev_name = NULL; |
| if (!strcmp(targetip, "default")) { |
| rt.rtmsg_flags = RTF_UP; |
| rt.rtmsg_dst_len = plen; |
| } else { |
| is_prefix_inet6((char **)&targetip, &rt); |
| if (get_addrinfo(targetip, (struct sockaddr_in6 *) &sock_in6)) |
| perror_exit("resolving '%s'", targetip); |
| } |
| rt.rtmsg_metric = 1; //default metric. |
| memcpy(&rt.rtmsg_dst, sock_in6.sin6_addr.s6_addr, sizeof(struct in6_addr)); |
| get_next_params_inet6(argv, &sock_in6, &rt, (char **)&dev_name); |
| |
| sockfd = xsocket(AF_INET6, SOCK_DGRAM, 0); |
| if (dev_name) { |
| char ifre_buf[sizeof(struct ifreq)] = {0,}; |
| struct ifreq *ifre = (struct ifreq*)ifre_buf; |
| strncpy(ifre->ifr_name, dev_name, IFNAMSIZ-1); |
| xioctl(sockfd, SIOGIFINDEX, ifre); |
| rt.rtmsg_ifindex = ifre->ifr_ifindex; |
| } |
| if (action == 1) xioctl(sockfd, SIOCADDRT, &rt); |
| else xioctl(sockfd, SIOCDELRT, &rt); |
| xclose(sockfd); |
| } else show_route_help(); |
| } |
| |
| /* |
| * format the dest and src address in ipv6 format. |
| * e.g. 2002:6b6d:26c8:d:ea03:9aff:fe65:9d62 |
| */ |
| static void ipv6_addr_formating(char *ptr, char *addr) |
| { |
| int i = 0; |
| while (i <= IPV6_ADDR_LEN) { |
| if (!*ptr) { |
| if (i == IPV6_ADDR_LEN) { |
| addr[IPV6_ADDR_LEN - 1] = 0; //NULL terminating the ':' seperated address. |
| break; |
| } |
| error_exit("IPv6 ip format error"); |
| } |
| addr[i++] = *ptr++; |
| if (!((i+1) % 5)) addr[i++] = ':'; //put ':' after 4th bit |
| } |
| } |
| |
| static void display_routes6(void) |
| { |
| char iface[16] = {0,}, ipv6_dest_addr[41]; |
| char ipv6_src_addr[41], flag_val[10], buf2[INET6_ADDRSTRLEN]; |
| int prefixlen, metric, use, refcount, flag, items = 0; |
| unsigned char buf[sizeof(struct in6_addr)]; |
| |
| FILE *fp = xfopen("/proc/net/ipv6_route", "r"); |
| |
| xprintf("Kernel IPv6 routing table\n" |
| "%-43s%-40s Flags Metric Ref Use Iface\n", "Destination", "Next Hop"); |
| |
| while ((items = fscanf(fp, "%32s%x%*s%*x%32s%x%x%x%x%10s\n", ipv6_dest_addr+8, |
| &prefixlen, ipv6_src_addr+8, &metric, &use, &refcount, &flag, |
| iface)) == 8) { |
| |
| memset(flag_val, 0, 10); |
| |
| if (!(flag & RTF_UP)) continue; //skip down interfaces. |
| |
| //ipv6_dest_addr+8: as the values are filled from the 8th location of the array. |
| ipv6_addr_formating(ipv6_dest_addr+8, ipv6_dest_addr); |
| ipv6_addr_formating(ipv6_src_addr+8, ipv6_src_addr); |
| |
| get_flag_value(flag_val, (flag & (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT| |
| RTF_ADDRCONF|RTF_CACHE))); |
| if (inet_pton(AF_INET6, ipv6_dest_addr, buf) <= 0) perror_exit("inet"); |
| if (inet_ntop(AF_INET6, buf, buf2, INET6_ADDRSTRLEN)) { |
| sprintf(toybuf, "%s/%d", buf2, prefixlen); |
| } |
| |
| if (inet_pton(AF_INET6, ipv6_src_addr, buf) <= 0) perror_exit("inet"); |
| if (inet_ntop(AF_INET6, buf, buf2, INET6_ADDRSTRLEN)) { |
| xprintf("%-43s %-39s %-5s %-6d %-4d %5d %-8s\n", |
| toybuf, buf2, flag_val, metric, refcount, use, iface); |
| } |
| } |
| if ((items > 0) && feof(fp)) perror_exit("fscanf"); |
| |
| fclose(fp); |
| } |
| |
| void route_main(void) |
| { |
| if (!(toys.optflags & FLAG_A)) TT.family = "inet"; |
| if (!*toys.optargs) { |
| if (!strcmp(TT.family, "inet")) display_routes(); |
| else if (!strcmp(TT.family, "inet6")) display_routes6(); |
| else show_route_help(); |
| return; |
| }//End of if statement. |
| |
| if (!strcmp(TT.family, "inet6")) setroute_inet6(toys.optargs); |
| else setroute(toys.optargs); |
| } |