mirror of
https://github.com/xcat2/confluent.git
synced 2024-11-26 11:30:23 +00:00
2bd2946e9f
Since we are dealing in TLS certificates, the easiest thing is to have copernicus sync time. It is not as robust as ntp, but it'll do as a stopgap until the real time utilities kick in.
225 lines
8.8 KiB
C
225 lines
8.8 KiB
C
#include <dirent.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <ifaddrs.h>
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#include <net/if_arp.h>
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#include <linux/if_packet.h>
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#include <arpa/inet.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 <sys/types.h>
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#include <sys/time.h>
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#include <net/if.h>
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int add_uuid(char* destination, int maxsize) {
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int uuidf;
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int uuidsize;
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uuidf = open("/sys/devices/virtual/dmi/id/product_uuid", O_RDONLY);
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if (uuidf < 1) { return 0; }
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strncpy(destination, "/uuid=", maxsize);
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uuidsize = read(uuidf, destination + 6, maxsize - 6);
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close(uuidf);
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if (destination[uuidsize + 5] == '\n') {
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destination[uuidsize + 5 ] = 0;
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}
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return uuidsize + 6;
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}
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int add_macs(char* destination, int maxsize) {
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struct ifaddrs *ifc, *ifa;
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struct sockaddr_ll *lla;
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int offset;
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char macaddr[32];
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offset = 0;
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getifaddrs(&ifa);
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for (ifc = ifa; ifc != NULL; ifc = ifc->ifa_next) {
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if (ifc->ifa_addr->sa_family != AF_PACKET)
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continue;
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lla = (struct sockaddr_ll *)ifc->ifa_addr;
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if (lla->sll_hatype == ARPHRD_INFINIBAND) {
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snprintf(macaddr, 32, "/mac=%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
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lla->sll_addr[12], lla->sll_addr[13], lla->sll_addr[14],
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lla->sll_addr[15], lla->sll_addr[16], lla->sll_addr[17],
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lla->sll_addr[18], lla->sll_addr[19]
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);
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} else if (lla->sll_hatype == ARPHRD_ETHER) {
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snprintf(macaddr, 32, "/mac=%02x:%02x:%02x:%02x:%02x:%02x",
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lla->sll_addr[0], lla->sll_addr[1], lla->sll_addr[2],
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lla->sll_addr[3], lla->sll_addr[4], lla->sll_addr[5],
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lla->sll_addr[6]
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);
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} else {
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continue;
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}
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strncpy(destination + offset, macaddr, maxsize - offset);
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offset += strnlen(macaddr, 32);
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}
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freeifaddrs(ifa);
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}
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int main(int argc, char* argv[]) {
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struct ifaddrs *ifc, *ifa;
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struct sockaddr_in6 *in6;
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struct sockaddr_in *in, *bin;
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int ns, n4;
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struct sockaddr_in6 addr, dst;
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struct sockaddr_in addr4, dst4;
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char msg[1024];
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char *nodenameidx;
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char nodename[1024];
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char lastnodename[1024];
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char lastmsg[1024];
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char last6msg[1024];
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int ifidx, offset;
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fd_set rfds;
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struct timeval tv;
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int settime = 0;
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socklen_t dstsize, dst4size;
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dstsize = sizeof(dst);
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dst4size = sizeof(dst4);
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memset(msg, 0, 1024);
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memset(&addr, 0, sizeof(addr));
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memset(&dst, 0, sizeof(dst));
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memset(&dst4, 0, sizeof(dst4));
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memset(nodename, 0, 1024);
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memset(lastnodename, 0, 1024);
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memset(lastmsg, 0, 1024);
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memset(last6msg, 0, 1024);
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addr.sin6_family = AF_INET6;
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addr.sin6_addr = in6addr_any;
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addr.sin6_port = htons(190);
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addr4.sin_family = AF_INET;
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addr4.sin_addr.s_addr = htonl(INADDR_ANY);
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addr4.sin_port = htons(190);
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dst.sin6_family = AF_INET6;
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dst.sin6_port = htons(1900);
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inet_pton(AF_INET6, "ff02::c", &dst.sin6_addr);
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dst4.sin_family = AF_INET;
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dst4.sin_port = htons(1900);
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inet_pton(AF_INET, "239.255.255.250", &dst4.sin_addr);
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strncpy(msg, "M-SEARCH * HTTP/1.1\r\nST: urn:xcat.org:service:confluent:", 1024);
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offset = strnlen(msg, 1024);
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add_uuid(msg + offset, 1024 - offset);
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offset = strnlen(msg, 1024);
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add_macs(msg + offset, 1024 - offset);
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offset = strnlen(msg, 1024);
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ns = socket(AF_INET6, SOCK_DGRAM, 0);
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n4 = socket(AF_INET, SOCK_DGRAM, 0);
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ifidx = 1; /* reuse ifidx because it's an unused int here */
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setsockopt(n4, SOL_SOCKET, SO_BROADCAST, &ifidx, sizeof(ifidx));
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setsockopt(ns, IPPROTO_IPV6, IPV6_V6ONLY, &ifidx, sizeof(ifidx));
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/* For now, bind to 190 to prove we are a privileged process */
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bind(n4, (const struct sockaddr *)&addr4, sizeof(addr4));
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bind(ns, (const struct sockaddr *)&addr, sizeof(addr));
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getifaddrs(&ifa);
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for (ifc = ifa; ifc != NULL; ifc = ifc->ifa_next) {
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if (!ifc->ifa_addr) continue;
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if (ifc->ifa_flags & IFF_LOOPBACK) continue;
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if (ifc->ifa_flags & IFF_MULTICAST != IFF_MULTICAST) continue;
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if (ifc->ifa_addr->sa_family == AF_INET6) {
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in6 = (struct sockaddr_in6 *)ifc->ifa_addr;
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if (in6->sin6_scope_id == 0)
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continue;
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ifidx = in6->sin6_scope_id;
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setsockopt(ns, IPPROTO_IPV6, IPV6_MULTICAST_IF, &ifidx, sizeof(ifidx));
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sendto(ns, msg, strnlen(msg, 1024), 0, (const struct sockaddr *)&dst, sizeof(dst));
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} else if (ifc->ifa_addr->sa_family == AF_INET) {
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in = (struct sockaddr_in *)ifc->ifa_addr;
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bin = (struct sockaddr_in *)ifc->ifa_ifu.ifu_broadaddr;
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bin->sin_port = htons(1900);
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setsockopt(n4, IPPROTO_IP, IP_MULTICAST_IF, &in->sin_addr, sizeof(in->sin_addr));
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sendto(n4, msg, strnlen(msg, 1024), 0, (const struct sockaddr *)&dst4, sizeof(dst4));
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sendto(n4, msg, strnlen(msg, 1024), 0, (const struct sockaddr *)bin, sizeof(*bin));
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}
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}
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FD_ZERO(&rfds);
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FD_SET(n4, &rfds);
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FD_SET(ns, &rfds);
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tv.tv_sec = 2;
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tv.tv_usec = 500000;
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ifidx = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);
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while (ifidx) {
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if (ifidx == -1) perror("Unable to select");
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if (ifidx) {
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if (FD_ISSET(n4, &rfds)) {
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memset(msg, 0, 1024);
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/* Deny packet access to the last 24 bytes to assure null */
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recvfrom(n4, msg, 1000, 0, (struct sockaddr *)&dst4, &dst4size);
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if (nodenameidx = strstr(msg, "NODENAME: ")) {
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nodenameidx += 10;
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strncpy(nodename, nodenameidx, 1024);
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nodenameidx = strstr(nodename, "\r");
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if (nodenameidx) { nodenameidx[0] = 0; }
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if (strncmp(lastnodename, nodename, 1024) != 0) {
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printf("NODENAME: %s\n", nodename);
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strncpy(lastnodename, nodename, 1024);
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}
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}
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if (nodenameidx = strstr(msg, "CURRTIME: ")) {
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nodenameidx += 10;
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strncpy(nodename, nodenameidx, 1024);
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if (nodenameidx = strstr(nodename, "\r")) {
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nodenameidx[0] = 0;
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}
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settime = strtol(nodename, NULL, 10);
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}
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memset(msg, 0, 1024);
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inet_ntop(dst4.sin_family, &dst4.sin_addr, msg, dst4size);
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/* Take measure from printing out the same ip twice in a row */
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if (strncmp(lastmsg, msg, 1024) != 0) {
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sendto(n4, "PING", 4, 0, (const struct sockaddr *)&dst4, dst4size);
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printf("MANAGER: %s\n", msg);
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strncpy(lastmsg, msg, 1024);
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}
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}
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if (FD_ISSET(ns, &rfds)) {
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memset(msg, 0, 1024);
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/* Deny packet access to the last 24 bytes to assure null */
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recvfrom(ns, msg, 1000, 0, (struct sockaddr *)&dst, &dstsize);
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if (nodenameidx = strstr(msg, "NODENAME: ")) {
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nodenameidx += 10;
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strncpy(nodename, nodenameidx, 1024);
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nodenameidx = strstr(nodename, "\r");
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if (nodenameidx) { nodenameidx[0] = 0; }
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if (strncmp(lastnodename, nodename, 1024) != 0) {
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printf("NODENAME: %s\n", nodename);
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strncpy(lastnodename, nodename, 1024);
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}
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}
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if (nodenameidx = strstr(msg, "CURRTIME: ")) {
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nodenameidx += 10;
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strncpy(nodename, nodenameidx, 1024);
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if (nodenameidx = strstr(nodename, "\r")) {
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nodenameidx[0] = 0;
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}
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settime = strtol(nodename, NULL, 10);
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}
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memset(msg, 0, 1024);
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inet_ntop(dst.sin6_family, &dst.sin6_addr, msg, dstsize);
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if (strncmp(last6msg, msg, 1024) != 0) {
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sendto(ns, "PING", 4, 0, (const struct sockaddr *)&dst, dstsize);
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printf("MANAGER: %s", msg);
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if (strncmp(msg, "fe80::", 6) == 0) {
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printf("%%%u", dst.sin6_scope_id);
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}
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printf("\n");
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strncpy(last6msg, msg, 1024);
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}
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}
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}
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if (settime && argc > 1 && strcmp(argv[1], "-t") == 0) {
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tv.tv_sec = settime;
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settimeofday(&tv, NULL);
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settime = 0;
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}
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tv.tv_sec = 0;
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FD_SET(n4, &rfds);
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FD_SET(ns, &rfds);
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ifidx = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);
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}
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}
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