diff options
| -rw-r--r-- | toys/pending/route.c | 121 |
1 files changed, 92 insertions, 29 deletions
diff --git a/toys/pending/route.c b/toys/pending/route.c index 562e5ecd..62fde509 100644 --- a/toys/pending/route.c +++ b/toys/pending/route.c @@ -158,45 +158,108 @@ static void get_flag_value(char *str, int flags) *str = 0; } -// 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. + int fd, msg_hdr_len, route_protocol; + struct nlmsghdr buf[8192 / sizeof(struct nlmsghdr)]; + struct nlmsghdr *msg_hdr_ptr; + struct rtmsg req; - FILE *fp = xfopen("/proc/net/route", "r"); + struct rtmsg *route_entry; + struct rtattr *route_attribute; - 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 + fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); - 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"); + memset(&req, 0, sizeof(req)); + req.rtm_family = AF_INET; + req.rtm_table = RT_TABLE_MAIN; - if (!gate && !(toys.optflags & FLAG_n)) strcpy( gateip, "*"); - else if (!inet_ntop(AF_INET, &gate, gateip, 32)) perror_exit("inet"); + send_nlrtmsg(fd, RTM_GETROUTE, NLM_F_REQUEST | NLM_F_DUMP, &req); - if (!inet_ntop(AF_INET, &mask, maskip, 32)) perror_exit("inet"); + xprintf("Kernel IP routing table\n" + "Destination Gateway Genmask Flags %s Iface\n", + (toys.optflags & FLAG_e)? " MSS Window irtt" : "Metric Ref Use"); + + msg_hdr_len = xrecv(fd, buf, sizeof(buf)); + msg_hdr_ptr = (struct nlmsghdr *) buf; + while (msg_hdr_ptr->nlmsg_type != NLMSG_DONE) { + while (NLMSG_OK(msg_hdr_ptr, msg_hdr_len)) { + route_entry = (struct rtmsg *) NLMSG_DATA(msg_hdr_ptr); + route_protocol = route_entry->rtm_protocol; + + // Annoyingly NLM_F_MATCH is not yet implemented so even if we pass in + // RT_TABLE_MAIN with RTM_GETROUTE it still returns everything so we + // have to filter here. + if (route_entry->rtm_table == RT_TABLE_MAIN) { + struct in_addr netmask_addr; + char destip[32] = "0.0.0.0"; + char gateip[32] = "0.0.0.0"; + char netmask[32] = "0.0.0.0"; + char flags[10] = "U"; + uint32_t priority = 0; + char if_name[IF_NAMESIZE] = "-"; + uint32_t route_netmask; + + if (!(toys.optflags & FLAG_n)) strcpy(destip, "default"); + if (!(toys.optflags & FLAG_n)) strcpy(gateip, "*"); + + route_netmask = route_entry->rtm_dst_len; + if (route_netmask == 0) { + netmask_addr.s_addr = ~((in_addr_t) -1); + } else { + netmask_addr.s_addr = htonl(~((1 << (32 - route_netmask)) - 1)); + } + inet_ntop(AF_INET, &netmask_addr, netmask, sizeof(netmask)); + + route_attribute = RTM_RTA(route_entry); + int route_attribute_len = RTM_PAYLOAD(msg_hdr_ptr); + while (RTA_OK(route_attribute, route_attribute_len)) { + switch (route_attribute->rta_type) { + case RTA_DST: + inet_ntop(AF_INET, RTA_DATA(route_attribute), destip, 24); + break; + + case RTA_GATEWAY: + inet_ntop(AF_INET, RTA_DATA(route_attribute), gateip, 24); + strcat(flags, "G"); + break; + + case RTA_PRIORITY: + priority = *(uint32_t *) RTA_DATA(route_attribute); + break; + + case RTA_OIF: + if_indextoname(*((int *) RTA_DATA(route_attribute)), if_name); + break; + + case RTA_METRICS: + //todo: Implement mss, win, irtt + break; + } + + route_attribute = RTA_NEXT(route_attribute, route_attribute_len); + } + + // Set/Update flags, rtnetlink.h note RTPROT_REDIRECT is not used + if (route_entry->rtm_type == RTN_UNREACHABLE) flags[0] = '!'; + if (route_netmask == 32) strcat(flags, "H"); + if (route_protocol == RTPROT_REDIRECT) strcat(flags, "D"); + + // Ref is not used by the kernel so hard coding to 0 + // IPv4 caching is disabled so hard coding Use to 0 + xprintf("%-15.15s %-15.15s %-16s%-6s", destip, gateip, netmask, flags); + if (toys.optflags & FLAG_e) { + xprintf("%5d %-5d %6d %s\n", 0, 0, 0, if_name); + } else xprintf("%-6d %-2d %7d %s\n", priority, 0, 0, if_name); + } + msg_hdr_ptr = NLMSG_NEXT(msg_hdr_ptr, msg_hdr_len); + } - //Get flag Values - get_flag_value(flag_val, flags); - 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); + msg_hdr_len = xrecv(fd, buf, sizeof(buf)); + msg_hdr_ptr = (struct nlmsghdr *) buf; } - if (items > 0 && feof(fp)) perror_exit("fscanf %d", items); - fclose(fp); + xclose(fd); } /* |