mirror of
https://github.com/fastfetch-cli/fastfetch.git
synced 2026-09-13 02:42:09 +02:00
Carter Li
445 lines
16 KiB
C
445 lines
16 KiB
C
#include "common/netif.h"
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#include "common/io.h"
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#include "common/mallocHelper.h"
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#include "common/debug.h"
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#include <arpa/inet.h>
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#include <linux/rtnetlink.h>
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#include <net/if.h>
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bool ffNetifGetDefaultRouteImplV4(FFNetifDefaultRouteResult* result)
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{
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FF_DEBUG("Starting IPv4 default route detection");
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FF_AUTO_CLOSE_FD int sock_fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
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if (sock_fd < 0)
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{
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FF_DEBUG("Failed to create netlink socket: %s", strerror(errno));
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return false;
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}
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FF_DEBUG("Created netlink socket: fd=%d", sock_fd);
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unsigned pid = (unsigned) getpid();
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FF_DEBUG("Process PID: %u", pid);
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// Bind socket
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struct sockaddr_nl addr = {
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.nl_family = AF_NETLINK,
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.nl_pid = 0, // Let kernel choose PID
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.nl_groups = 0, // No multicast groups
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};
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if (bind(sock_fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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FF_DEBUG("Failed to bind socket: %s", strerror(errno));
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return false;
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}
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FF_DEBUG("Successfully bound socket");
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struct __attribute__((__packed__)) {
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struct nlmsghdr nlh;
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struct rtmsg rtm;
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struct rtattr rta;
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uint32_t table;
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} req = {
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// Netlink message header
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.nlh = {
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.nlmsg_len = sizeof(req),
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.nlmsg_type = RTM_GETROUTE,
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.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
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.nlmsg_seq = 1,
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.nlmsg_pid = pid,
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},
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// Route message
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.rtm = {
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.rtm_family = AF_INET,
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.rtm_dst_len = 0, // Match all destinations
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.rtm_src_len = 0, // Match all sources
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.rtm_tos = 0,
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.rtm_table = RT_TABLE_UNSPEC,
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.rtm_protocol = RTPROT_UNSPEC,
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.rtm_scope = RT_SCOPE_UNIVERSE,
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.rtm_type = RTN_UNSPEC,
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.rtm_flags = 0,
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},
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// Route attribute for main table
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.rta = {
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.rta_len = RTA_LENGTH(sizeof(uint32_t)),
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.rta_type = RTA_TABLE,
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},
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.table = RT_TABLE_MAIN,
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};
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struct sockaddr_nl dest_addr = {
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.nl_family = AF_NETLINK,
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.nl_pid = 0, // Kernel
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.nl_groups = 0, // No multicast groups
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};
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ssize_t sent = sendto(sock_fd, &req, sizeof(req), 0,
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(struct sockaddr*)&dest_addr, sizeof(dest_addr));
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if (sent != sizeof(req)) {
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FF_DEBUG("Failed to send netlink request: sent=%zd, expected=%zu", sent, sizeof(req));
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return false;
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}
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FF_DEBUG("Sent netlink request: %zd bytes", sent);
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struct sockaddr_nl src_addr = {};
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socklen_t src_addr_len = sizeof(src_addr);
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uint8_t buffer[1024 * 16]; // 16 KB buffer should be sufficient
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uint32_t minMetric = UINT32_MAX;
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FF_MAYBE_UNUSED int routeCount = 0;
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while (true)
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{
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ssize_t received = recvfrom(sock_fd, buffer, sizeof(buffer), 0,
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(struct sockaddr*)&src_addr, &src_addr_len);
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if (received < 0) {
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FF_DEBUG("Failed to receive netlink response: %s", strerror(errno));
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return false;
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}
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if (received >= (ssize_t)sizeof(buffer)) {
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FF_DEBUG("Received truncated message: received %zd, bufsize %zu", received, sizeof(buffer));
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return false;
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}
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FF_DEBUG("Received netlink response: %zd bytes", received);
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if (received == 0) {
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FF_DEBUG("Received zero-length netlink response, ending processing");
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break;
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}
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struct {
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uint32_t metric;
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uint32_t ifindex;
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uint32_t prefsrc;
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} entry;
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for (const struct nlmsghdr* nlh = (struct nlmsghdr*)buffer;
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NLMSG_OK(nlh, received);
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nlh = NLMSG_NEXT(nlh, received))
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{
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if (nlh->nlmsg_seq != 1 || nlh->nlmsg_pid != pid)
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continue;
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if (nlh->nlmsg_type == NLMSG_DONE)
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{
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FF_DEBUG("Received NLMSG_DONE, processed %d routes", routeCount);
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goto exit;
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}
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if (nlh->nlmsg_type == NLMSG_ERROR) {
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FF_DEBUG("Netlink reports error: %s", strerror(-((struct nlmsgerr*)NLMSG_DATA(nlh))->error));
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continue;
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}
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if (nlh->nlmsg_type != RTM_NEWROUTE) {
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FF_DEBUG("Skipping non-route message: type=%d", nlh->nlmsg_type);
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continue;
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}
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routeCount++;
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struct rtmsg* rtm = (struct rtmsg*)NLMSG_DATA(nlh);
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if (rtm->rtm_family != AF_INET) {
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FF_DEBUG("Skipping non-IPv4 route #%d (family=%d)", routeCount, rtm->rtm_family);
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continue;
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}
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if (rtm->rtm_dst_len != 0) {
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FF_DEBUG("Skipping non-default route #%d (dst_len=%d)", routeCount, rtm->rtm_dst_len);
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continue;
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}
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// Skip local/loopback routes
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if (rtm->rtm_scope == RT_SCOPE_HOST || rtm->rtm_type == RTN_LOCAL) {
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FF_DEBUG("Skipping local route #%d (scope=%d, type=%d)", routeCount, rtm->rtm_scope, rtm->rtm_type);
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continue;
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}
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FF_DEBUG("Processing IPv4 default route candidate #%d", routeCount);
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entry = (__typeof__(entry)) { }; // Default to zero metric (no RTA_PRIORITY found)
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// Parse route attributes
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size_t rtm_len = RTM_PAYLOAD(nlh);
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for (struct rtattr* rta = RTM_RTA(rtm);
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RTA_OK(rta, rtm_len);
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rta = RTA_NEXT(rta, rtm_len))
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{
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if (RTA_PAYLOAD(rta) < sizeof(uint32_t))
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continue; // Skip invalid attributes
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uint32_t rta_data = *(uint32_t*) RTA_DATA(rta);
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switch (rta->rta_type) {
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case RTA_DST:
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FF_DEBUG("Unexpected RTA_DST: %s (len=%u)", inet_ntoa((struct in_addr) { .s_addr = rta_data }), rtm->rtm_dst_len);
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goto next;
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case RTA_OIF:
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entry.ifindex = rta_data;
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FF_DEBUG("Found interface index: %u", entry.ifindex);
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break;
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case RTA_GATEWAY:
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FF_DEBUG("Found gateway: %s", inet_ntoa(*(struct in_addr*)&rta_data));
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if (rta_data == 0) goto next;
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break;
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case RTA_PRIORITY:
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FF_DEBUG("Found metric: %u", rta_data);
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if (rta_data >= minMetric) goto next;
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entry.metric = rta_data;
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break;
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case RTA_PREFSRC:
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entry.prefsrc = rta_data;
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FF_DEBUG("Found preferred source: %s", inet_ntoa(*(struct in_addr*)&rta_data));
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break;
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}
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}
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if (entry.ifindex == 0 || entry.metric >= minMetric)
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{
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next:
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FF_DEBUG("Skipping route: ifindex=%u, metric=%u", entry.ifindex, entry.metric);
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continue;
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}
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minMetric = entry.metric;
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result->ifIndex = entry.ifindex;
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FF_DEBUG("Updated best route: ifindex=%u, metric=%u, prefsrc=%x", entry.ifindex, entry.metric, entry.prefsrc);
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result->preferredSourceAddrV4 = entry.prefsrc;
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if (minMetric == 0)
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{
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FF_DEBUG("Found zero metric route, stopping further processing");
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break; // Stop processing if we found a zero metric route
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}
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}
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}
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exit:
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if (minMetric < UINT32_MAX)
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{
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if_indextoname(result->ifIndex, result->ifName);
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FF_DEBUG("Found default IPv4 route: interface=%s, index=%u, metric=%u", result->ifName, result->ifIndex, minMetric);
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return true;
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}
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FF_DEBUG("No IPv4 default route found");
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return false;
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}
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bool ffNetifGetDefaultRouteImplV6(FFNetifDefaultRouteResult* result)
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{
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FF_DEBUG("Starting IPv6 default route detection");
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FF_AUTO_CLOSE_FD int sock_fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
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if (sock_fd < 0)
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{
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FF_DEBUG("Failed to create netlink socket: %s", strerror(errno));
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return false;
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}
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FF_DEBUG("Created netlink socket: fd=%d", sock_fd);
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unsigned pid = (unsigned) getpid();
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FF_DEBUG("Process PID: %u", pid);
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// Bind socket
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struct sockaddr_nl addr = {
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.nl_family = AF_NETLINK,
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.nl_pid = 0, // Let kernel choose PID
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.nl_groups = 0, // No multicast groups
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};
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if (bind(sock_fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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FF_DEBUG("Failed to bind socket: %s", strerror(errno));
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return false;
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}
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FF_DEBUG("Successfully bound socket");
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struct __attribute__((__packed__)) {
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struct nlmsghdr nlh;
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struct rtmsg rtm;
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struct rtattr rta;
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uint32_t table;
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} req = {
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// Netlink message header
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.nlh = {
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.nlmsg_len = sizeof(req),
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.nlmsg_type = RTM_GETROUTE,
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.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
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.nlmsg_seq = 1,
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.nlmsg_pid = pid,
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},
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// Route message
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.rtm = {
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.rtm_family = AF_INET6, // IPv6 instead of IPv4
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.rtm_dst_len = 0, // Match all destinations
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.rtm_src_len = 0, // Match all sources
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.rtm_tos = 0,
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.rtm_table = RT_TABLE_UNSPEC,
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.rtm_protocol = RTPROT_UNSPEC,
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.rtm_scope = RT_SCOPE_UNIVERSE,
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.rtm_type = RTN_UNSPEC,
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.rtm_flags = 0,
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},
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// Route attribute for main table
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.rta = {
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.rta_len = RTA_LENGTH(sizeof(uint32_t)),
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.rta_type = RTA_TABLE,
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},
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.table = RT_TABLE_MAIN,
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};
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struct sockaddr_nl dest_addr = {
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.nl_family = AF_NETLINK,
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.nl_pid = 0, // Kernel
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.nl_groups = 0, // No multicast groups
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};
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ssize_t sent = sendto(sock_fd, &req, sizeof(req), 0,
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(struct sockaddr*)&dest_addr, sizeof(dest_addr));
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if (sent != sizeof(req)) {
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FF_DEBUG("Failed to send netlink request: sent=%zd, expected=%zu", sent, sizeof(req));
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return false;
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}
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FF_DEBUG("Sent netlink request: %zd bytes", sent);
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struct sockaddr_nl src_addr = {};
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socklen_t src_addr_len = sizeof(src_addr);
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uint8_t buffer[1024 * 16]; // 16 KB buffer should be sufficient
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uint32_t minMetric = UINT32_MAX;
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FF_MAYBE_UNUSED int routeCount = 0;
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while (true)
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{
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ssize_t received = recvfrom(sock_fd, buffer, sizeof(buffer), 0,
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(struct sockaddr*)&src_addr, &src_addr_len);
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if (received < 0) {
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FF_DEBUG("Failed to receive netlink response: %s", strerror(errno));
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return false;
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}
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if (received >= (ssize_t)sizeof(buffer)) {
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FF_DEBUG("Received truncated message: received %zd, bufsize %zu", received, sizeof(buffer));
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return false;
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}
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FF_DEBUG("Received netlink response: %zd bytes", received);
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if (received == 0) {
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FF_DEBUG("Received zero-length netlink response, ending processing");
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break;
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}
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struct {
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uint32_t metric;
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uint32_t ifindex;
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} entry;
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for (const struct nlmsghdr* nlh = (struct nlmsghdr*)buffer;
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NLMSG_OK(nlh, received);
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nlh = NLMSG_NEXT(nlh, received))
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{
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if (nlh->nlmsg_seq != 1 || nlh->nlmsg_pid != pid)
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continue;
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if (nlh->nlmsg_type == NLMSG_DONE)
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{
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FF_DEBUG("Received NLMSG_DONE, processed %d routes", routeCount);
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goto exit;
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}
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if (nlh->nlmsg_type == NLMSG_ERROR) {
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FF_DEBUG("Netlink reports error: %s", strerror(-((struct nlmsgerr*)NLMSG_DATA(nlh))->error));
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continue;
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}
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if (nlh->nlmsg_type != RTM_NEWROUTE) {
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FF_DEBUG("Skipping non-route message: type=%d", nlh->nlmsg_type);
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continue;
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}
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routeCount++;
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struct rtmsg* rtm = (struct rtmsg*)NLMSG_DATA(nlh);
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if (rtm->rtm_family != AF_INET6) {
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FF_DEBUG("Skipping non-IPv6 route #%d (family=%d)", routeCount, rtm->rtm_family);
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continue;
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}
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if (rtm->rtm_dst_len != 0) {
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FF_DEBUG("Skipping non-default route #%d (dst_len=%d)", routeCount, rtm->rtm_dst_len);
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continue;
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}
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// Skip local/loopback routes
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if (rtm->rtm_scope == RT_SCOPE_HOST || rtm->rtm_type == RTN_LOCAL) {
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FF_DEBUG("Skipping local route #%d (scope=%d, type=%d)", routeCount, rtm->rtm_scope, rtm->rtm_type);
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continue;
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}
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FF_DEBUG("Processing IPv6 default route candidate #%d", routeCount);
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entry = (__typeof__(entry)) { }; // Default to zero metric (no RTA_PRIORITY found)
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// Parse route attributes
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size_t rtm_len = RTM_PAYLOAD(nlh);
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for (struct rtattr* rta = RTM_RTA(rtm);
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RTA_OK(rta, rtm_len);
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rta = RTA_NEXT(rta, rtm_len))
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{
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switch (rta->rta_type) {
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case RTA_DST:
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if (RTA_PAYLOAD(rta) >= sizeof(struct in6_addr)) {
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FF_MAYBE_UNUSED char str[INET6_ADDRSTRLEN];
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FF_DEBUG("Unexpected RTA_DST: %s", inet_ntop(AF_INET6, RTA_DATA(rta), str, sizeof(str)));
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goto next;
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}
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break;
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case RTA_OIF:
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if (RTA_PAYLOAD(rta) >= sizeof(uint32_t)) {
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entry.ifindex = *(uint32_t*) RTA_DATA(rta);
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FF_DEBUG("Found interface index: %u", entry.ifindex);
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}
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break;
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case RTA_GATEWAY:
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if (RTA_PAYLOAD(rta) >= sizeof(struct in6_addr)) {
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struct in6_addr* gw = (struct in6_addr*) RTA_DATA(rta);
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if (IN6_IS_ADDR_UNSPECIFIED(gw)) goto next;
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FF_MAYBE_UNUSED char str[INET6_ADDRSTRLEN];
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FF_DEBUG("Found gateway: %s", inet_ntop(AF_INET6, gw, str, sizeof(str)));
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}
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break;
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case RTA_PRIORITY:
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if (RTA_PAYLOAD(rta) >= sizeof(uint32_t)) {
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uint32_t metric = *(uint32_t*) RTA_DATA(rta);
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FF_DEBUG("Found metric: %u", metric);
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if (metric >= minMetric) goto next;
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entry.metric = metric;
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}
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break;
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}
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}
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if (entry.ifindex == 0 || entry.metric >= minMetric)
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{
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next:
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FF_DEBUG("Skipping route: ifindex=%u, metric=%u", entry.ifindex, entry.metric);
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continue;
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}
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minMetric = entry.metric;
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result->ifIndex = entry.ifindex;
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FF_DEBUG("Updated best route: ifindex=%u, metric=%u", entry.ifindex, entry.metric);
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if (minMetric == 0)
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{
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FF_DEBUG("Found zero metric route, stopping further processing");
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break; // Stop processing if we found a zero metric route
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}
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}
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}
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exit:
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if (minMetric < UINT32_MAX)
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{
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if_indextoname(result->ifIndex, result->ifName);
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FF_DEBUG("Found default IPv6 route: interface=%s, index=%u, metric=%u", result->ifName, result->ifIndex, minMetric);
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return true;
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}
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FF_DEBUG("No IPv6 default route found");
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return false;
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}
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