X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fodhcpd.c;h=fafa3f68642781e82fcfeb459c443fe14ad81a90;hb=a54cee0;hp=39ce98ea5895a7ea0f47523e752bb28c93110168;hpb=0903c8170e762a8ab9fa45d521b7d509a0acdaa2;p=oweals%2Fodhcpd.git diff --git a/src/odhcpd.c b/src/odhcpd.c index 39ce98e..fafa3f6 100644 --- a/src/odhcpd.c +++ b/src/odhcpd.c @@ -24,12 +24,14 @@ #include #include #include +#include +#include #include #include #include #include -#include +#include #include #include @@ -44,15 +46,52 @@ static int ioctl_sock; -static int rtnl_socket = -1; -static int rtnl_seq = 0; static int urandom_fd = -1; +static void sighandler(_unused int signal) +{ + uloop_end(); +} + +static void print_usage(const char *app) +{ + printf( + "== %s Usage ==\n\n" + " -h, --help Print this help\n" + " -l level Specify log level 0..7 (default %d)\n", + app, config.log_level + ); +} -int main() +static bool ipv6_enabled(void) +{ + int fd = socket(AF_INET6, SOCK_DGRAM, 0); + + if (fd < 0) + return false; + + close(fd); + + return true; +} + +int main(int argc, char **argv) { openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON); - setlogmask(LOG_UPTO(LOG_INFO)); + int opt; + + while ((opt = getopt(argc, argv, "hl:")) != -1) { + switch (opt) { + case 'h': + print_usage(argv[0]); + return 0; + case 'l': + config.log_level = (atoi(optarg) & LOG_PRIMASK); + fprintf(stderr, "Log level set to %d\n", config.log_level); + break; + } + } + setlogmask(LOG_UPTO(config.log_level)); uloop_init(); if (getuid() != 0) { @@ -62,93 +101,97 @@ int main() ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); - if ((rtnl_socket = odhcpd_open_rtnl()) < 0) { - syslog(LOG_ERR, "Unable to open socket: %s", strerror(errno)); - return 2; - } + if (ioctl_sock < 0) + return 4; if ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0) return 4; signal(SIGUSR1, SIG_IGN); + signal(SIGINT, sighandler); + signal(SIGTERM, sighandler); - if (init_router()) + if (netlink_init()) return 4; - if (init_dhcpv6()) - return 4; + if (ipv6_enabled()) { + if (router_init()) + return 4; - if (init_ndp()) - return 4; + if (dhcpv6_init()) + return 4; - if (init_dhcpv4()) + if (ndp_init()) + return 4; + } +#ifndef DHCPV4_SUPPORT + else return 4; +#else + if (dhcpv4_init()) + return 4; +#endif odhcpd_run(); return 0; } -int odhcpd_open_rtnl(void) -{ - int sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE); - - // Connect to the kernel netlink interface - struct sockaddr_nl nl = {.nl_family = AF_NETLINK}; - if (connect(sock, (struct sockaddr*)&nl, sizeof(nl))) { - syslog(LOG_ERR, "Failed to connect to kernel rtnetlink: %s", - strerror(errno)); - return -1; - } - - return sock; -} - -// Read IPv6 MTU for interface -int odhcpd_get_interface_mtu(const char *ifname) +/* Read IPv6 MTU for interface */ +int odhcpd_get_interface_config(const char *ifname, const char *what) { char buf[64]; - const char *sysctl_pattern = "/proc/sys/net/ipv6/conf/%s/mtu"; - snprintf(buf, sizeof(buf), sysctl_pattern, ifname); + const char *sysctl_pattern = "/proc/sys/net/ipv6/conf/%s/%s"; + snprintf(buf, sizeof(buf), sysctl_pattern, ifname, what); int fd = open(buf, O_RDONLY); + if (fd < 0) + return -1; + ssize_t len = read(fd, buf, sizeof(buf) - 1); close(fd); if (len < 0) return -1; - buf[len] = 0; return atoi(buf); - } -// Read IPv6 MAC for interface +/* Read IPv6 MAC for interface */ int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]) { struct ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); - strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name)); + strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name) - 1); if (ioctl(ioctl_sock, SIOCGIFHWADDR, &ifr) < 0) return -1; + memcpy(mac, ifr.ifr_hwaddr.sa_data, 6); return 0; } -// Forwards a packet on a specific interface +/* Forwards a packet on a specific interface */ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, struct iovec *iov, size_t iov_len, const struct interface *iface) { - // Construct headers + /* Construct headers */ uint8_t cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))] = {0}; - struct msghdr msg = {(void*)dest, sizeof(*dest), iov, iov_len, - cmsg_buf, sizeof(cmsg_buf), 0}; - - // Set control data (define destination interface) + struct msghdr msg = { + .msg_name = (void *) dest, + .msg_namelen = sizeof(*dest), + .msg_iov = iov, + .msg_iovlen = iov_len, + .msg_control = cmsg_buf, + .msg_controllen = sizeof(cmsg_buf), + .msg_flags = 0 + }; + + /* Set control data (define destination interface) */ struct cmsghdr *chdr = CMSG_FIRSTHDR(&msg); chdr->cmsg_level = IPPROTO_IPV6; chdr->cmsg_type = IPV6_PKTINFO; @@ -156,145 +199,126 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, struct in6_pktinfo *pktinfo = (struct in6_pktinfo*)CMSG_DATA(chdr); pktinfo->ipi6_ifindex = iface->ifindex; - // Also set scope ID if link-local + /* Also set scope ID if link-local */ if (IN6_IS_ADDR_LINKLOCAL(&dest->sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&dest->sin6_addr)) dest->sin6_scope_id = iface->ifindex; - // IPV6_PKTINFO doesn't really work for IPv6-raw sockets (bug?) - if (dest->sin6_port == 0) { - msg.msg_control = NULL; - msg.msg_controllen = 0; - } - char ipbuf[INET6_ADDRSTRLEN]; inet_ntop(AF_INET6, &dest->sin6_addr, ipbuf, sizeof(ipbuf)); ssize_t sent = sendmsg(socket, &msg, MSG_DONTWAIT); if (sent < 0) - syslog(LOG_WARNING, "Failed to send to %s%%%s (%s)", - ipbuf, iface->ifname, strerror(errno)); + syslog(LOG_NOTICE, "Failed to send to %s%%%s@%s (%m)", + ipbuf, iface->name, iface->ifname); else - syslog(LOG_NOTICE, "Sent %li bytes to %s%%%s", - (long)sent, ipbuf, iface->ifname); + syslog(LOG_DEBUG, "Sent %zd bytes to %s%%%s@%s", + sent, ipbuf, iface->name, iface->ifname); return sent; } -// Detect an IPV6-address currently assigned to the given interface -ssize_t odhcpd_get_interface_addresses(int ifindex, - struct odhcpd_ipaddr *addrs, size_t cnt) +static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr) { - struct { - struct nlmsghdr nhm; - struct ifaddrmsg ifa; - } req = {{sizeof(req), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP, - ++rtnl_seq, 0}, {AF_INET6, 0, 0, 0, ifindex}}; - if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req)) - return 0; + int ret = -1; + struct sockaddr_in6 addr; + socklen_t alen = sizeof(addr); + int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); - uint8_t buf[8192]; - ssize_t len = 0, ret = 0; + if (sock < 0) + return -1; - for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) { - while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) { - len = recv(rtnl_socket, buf, sizeof(buf), 0); - nhm = (struct nlmsghdr*)buf; - if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) { - if (errno == EINTR) - continue; - else - return ret; - } - } + memset(&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; + inet_pton(AF_INET6, ALL_IPV6_ROUTERS, &addr.sin6_addr); + addr.sin6_scope_id = ifindex; - if (nhm->nlmsg_type != RTM_NEWADDR) - break; + if (!connect(sock, (struct sockaddr*)&addr, sizeof(addr)) && + !getsockname(sock, (struct sockaddr*)&addr, &alen)) { + *lladdr = addr.sin6_addr; + ret = 0; + } - // Skip address but keep clearing socket buffer - if (ret >= (ssize_t)cnt) + close(sock); + return ret; +} + +/* + * DNS address selection criteria order : + * - use IPv6 address with valid lifetime if none is yet selected + * - use IPv6 address with a preferred lifetime if the already selected IPv6 address is deprecated + * - use an IPv6 ULA address if the already selected IPv6 address is not an ULA address + * - use the IPv6 address with the longest preferred lifetime + */ +int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr *addr) +{ + time_t now = odhcpd_time(); + ssize_t m = -1; + + for (size_t i = 0; i < iface->addr6_len; ++i) { + if (iface->addr6[i].valid <= (uint32_t)now) continue; - struct ifaddrmsg *ifa = NLMSG_DATA(nhm); - if (ifa->ifa_scope != RT_SCOPE_UNIVERSE || - ifa->ifa_index != (unsigned)ifindex) + if (m < 0) { + m = i; continue; + } - struct rtattr *rta = (struct rtattr*)&ifa[1]; - size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa)); - memset(&addrs[ret], 0, sizeof(addrs[ret])); - addrs[ret].prefix = ifa->ifa_prefixlen; - - while (RTA_OK(rta, alen)) { - if (rta->rta_type == IFA_ADDRESS) { - memcpy(&addrs[ret].addr, RTA_DATA(rta), - sizeof(struct in6_addr)); - } else if (rta->rta_type == IFA_CACHEINFO) { - struct ifa_cacheinfo *ifc = RTA_DATA(rta); - addrs[ret].preferred = ifc->ifa_prefered; - addrs[ret].valid = ifc->ifa_valid; - } + if (iface->addr6[m].preferred >= (uint32_t)now && + iface->addr6[i].preferred < (uint32_t)now) + continue; - rta = RTA_NEXT(rta, alen); - } + if (IN6_IS_ADDR_ULA(&iface->addr6[i].addr.in6)) { + if (!IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) { + m = i; + continue; + } + } else if (IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) + continue; - if (ifa->ifa_flags & IFA_F_DEPRECATED) - addrs[ret].preferred = 0; + if (iface->addr6[i].preferred > iface->addr6[m].preferred) + m = i; + } - addrs[ret].has_class = false; - addrs[ret].class = 0; -#ifdef WITH_UBUS - struct interface *iface = odhcpd_get_interface_by_index(ifindex); - if (iface) - addrs[ret].has_class = ubus_get_class(iface->ifname, - &addrs[ret].addr, &addrs[ret].class); -#endif - ++ret; + if (m >= 0) { + *addr = iface->addr6[m].addr.in6; + return 0; } - return ret; + return odhcpd_get_linklocal_interface_address(iface->ifindex, addr); } - struct interface* odhcpd_get_interface_by_index(int ifindex) { struct interface *iface; - list_for_each_entry(iface, &interfaces, head) - if (iface->ifindex == ifindex) - return iface; - return NULL; -} - - -struct interface* odhcpd_get_interface_by_name(const char *name) -{ - struct interface *iface; - list_for_each_entry(iface, &interfaces, head) - if (!strcmp(iface->ifname, name)) + avl_for_each_element(&interfaces, iface, avl) { + if (iface->ifindex == ifindex) return iface; + } return NULL; } - struct interface* odhcpd_get_master_interface(void) { struct interface *iface; - list_for_each_entry(iface, &interfaces, head) + + avl_for_each_element(&interfaces, iface, avl) { if (iface->master) return iface; + } return NULL; } -// Convenience function to receive and do basic validation of packets +/* Convenience function to receive and do basic validation of packets */ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int events) { struct odhcpd_event *e = container_of(u, struct odhcpd_event, uloop); - uint8_t data_buf[RELAYD_BUFFER_SIZE], cmsg_buf[128]; + uint8_t data_buf[8192], cmsg_buf[128]; union { struct sockaddr_in6 in6; struct sockaddr_in in; @@ -302,10 +326,31 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even struct sockaddr_nl nl; } addr; + if (u->error) { + int ret = -1; + socklen_t ret_len = sizeof(ret); + + u->error = false; + if (e->handle_error && getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len) == 0) + e->handle_error(e, ret); + } + + if (e->recv_msgs) { + e->recv_msgs(e); + return; + } + while (true) { struct iovec iov = {data_buf, sizeof(data_buf)}; - struct msghdr msg = {&addr, sizeof(addr), &iov, 1, - cmsg_buf, sizeof(cmsg_buf), 0}; + struct msghdr msg = { + .msg_name = (void *) &addr, + .msg_namelen = sizeof(addr), + .msg_iov = &iov, + .msg_iovlen = 1, + .msg_control = cmsg_buf, + .msg_controllen = sizeof(cmsg_buf), + .msg_flags = 0 + }; ssize_t len = recvmsg(u->fd, &msg, MSG_DONTWAIT); if (len < 0) { @@ -316,9 +361,10 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even } - // Extract destination interface + /* Extract destination interface */ int destiface = 0; int *hlim = NULL; + void *dest = NULL; struct in6_pktinfo *pktinfo; struct in_pktinfo *pkt4info; for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL; ch = CMSG_NXTHDR(&msg, ch)) { @@ -326,30 +372,26 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even ch->cmsg_type == IPV6_PKTINFO) { pktinfo = (struct in6_pktinfo*)CMSG_DATA(ch); destiface = pktinfo->ipi6_ifindex; + dest = &pktinfo->ipi6_addr; } else if (ch->cmsg_level == IPPROTO_IP && ch->cmsg_type == IP_PKTINFO) { pkt4info = (struct in_pktinfo*)CMSG_DATA(ch); destiface = pkt4info->ipi_ifindex; + dest = &pkt4info->ipi_addr; } else if (ch->cmsg_level == IPPROTO_IPV6 && ch->cmsg_type == IPV6_HOPLIMIT) { hlim = (int*)CMSG_DATA(ch); } } - // Check hoplimit if received + /* Check hoplimit if received */ if (hlim && *hlim != 255) continue; - // Detect interface for packet sockets + /* Detect interface for packet sockets */ if (addr.ll.sll_family == AF_PACKET) destiface = addr.ll.sll_ifindex; - struct interface *iface = - odhcpd_get_interface_by_index(destiface); - - if (!iface && addr.nl.nl_family != AF_NETLINK) - continue; - char ipbuf[INET6_ADDRSTRLEN] = "kernel"; if (addr.ll.sll_family == AF_PACKET && len >= (ssize_t)sizeof(struct ip6_hdr)) @@ -359,24 +401,52 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even else if (addr.in.sin_family == AF_INET) inet_ntop(AF_INET, &addr.in.sin_addr, ipbuf, sizeof(ipbuf)); - syslog(LOG_NOTICE, "--"); - syslog(LOG_NOTICE, "Received %li Bytes from %s%%%s", (long)len, - ipbuf, (iface) ? iface->ifname : "netlink"); + /* From netlink */ + if (addr.nl.nl_family == AF_NETLINK) { + syslog(LOG_DEBUG, "Received %zd Bytes from %s%%netlink", len, + ipbuf); + e->handle_dgram(&addr, data_buf, len, NULL, dest); + return; + } else if (destiface != 0) { + struct interface *iface; + + avl_for_each_element(&interfaces, iface, avl) { + if (iface->ifindex != destiface) + continue; + + syslog(LOG_DEBUG, "Received %zd Bytes from %s%%%s@%s", len, + ipbuf, iface->name, iface->ifname); + + e->handle_dgram(&addr, data_buf, len, iface, dest); + } + } + - e->handle_dgram(&addr, data_buf, len, iface); } } -// Register events for the multiplexer +/* Register events for the multiplexer */ int odhcpd_register(struct odhcpd_event *event) { event->uloop.cb = odhcpd_receive_packets; - return uloop_fd_add(&event->uloop, ULOOP_READ); + return uloop_fd_add(&event->uloop, ULOOP_READ | + ((event->handle_error) ? ULOOP_ERROR_CB : 0)); } -void odhcpd_urandom(void *data, size_t len) +int odhcpd_deregister(struct odhcpd_event *event) { - read(urandom_fd, data, len); + event->uloop.cb = NULL; + return uloop_fd_delete(&event->uloop); +} + +void odhcpd_process(struct odhcpd_event *event) +{ + odhcpd_receive_packets(&event->uloop, 0); +} + +int odhcpd_urandom(void *data, size_t len) +{ + return read(urandom_fd, data, len); } @@ -427,3 +497,129 @@ void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len) } *dst = 0; } + +const char *odhcpd_print_mac(const uint8_t *mac, const size_t len) +{ + static char buf[32]; + + snprintf(buf, sizeof(buf), "%02x", mac[0]); + for (size_t i = 1, j = 2; i < len && j < sizeof(buf); i++, j += 3) + snprintf(buf + j, sizeof(buf) - j, ":%02x", mac[i]); + + return buf; +} + +int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits) +{ + const uint8_t *a = av, *b = bv; + size_t bytes = bits / 8; + bits %= 8; + + int res = memcmp(a, b, bytes); + if (res == 0 && bits > 0) + res = (a[bytes] >> (8 - bits)) - (b[bytes] >> (8 - bits)); + + return res; +} + + +void odhcpd_bmemcpy(void *av, const void *bv, size_t bits) +{ + uint8_t *a = av; + const uint8_t *b = bv; + + size_t bytes = bits / 8; + bits %= 8; + memcpy(a, b, bytes); + + if (bits > 0) { + uint8_t mask = (1 << (8 - bits)) - 1; + a[bytes] = (a[bytes] & mask) | ((~mask) & b[bytes]); + } +} + + +int odhcpd_netmask2bitlen(bool inet6, void *mask) +{ + int bits; + struct in_addr *v4; + struct in6_addr *v6; + + if (inet6) + for (bits = 0, v6 = mask; + bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128; + bits++); + else + for (bits = 0, v4 = mask; + bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000; + bits++); + + return bits; +} + +bool odhcpd_bitlen2netmask(bool inet6, unsigned int bits, void *mask) +{ + uint8_t b; + struct in_addr *v4; + struct in6_addr *v6; + + if (inet6) + { + if (bits > 128) + return false; + + v6 = mask; + + for (unsigned int i = 0; i < sizeof(v6->s6_addr); i++) + { + b = (bits > 8) ? 8 : bits; + v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b)); + bits -= b; + } + } + else + { + if (bits > 32) + return false; + + v4 = mask; + v4->s_addr = bits ? htonl(~((1 << (32 - bits)) - 1)) : 0; + } + + return true; +} + +bool odhcpd_valid_hostname(const char *name) +{ +#define MAX_LABEL 63 + const char *c, *label, *label_end; + int label_sz = 0; + + for (c = name, label_sz = 0, label = name, label_end = name + strcspn(name, ".") - 1; + *c && label_sz <= MAX_LABEL; c++) { + if ((*c >= '0' && *c <= '9') || + (*c >= 'A' && *c <= 'Z') || + (*c >= 'a' && *c <= 'z')) { + label_sz++; + continue; + } + + if ((*c == '_' || *c == '-') && c != label && c != label_end) { + label_sz++; + continue; + } + + if (*c == '.') { + if (*(c + 1)) { + label = c + 1; + label_end = label + strcspn(label, ".") - 1; + label_sz = 0; + } + continue; + } + + return false; + } + + return (label_sz && label_sz <= MAX_LABEL ? true : false); +}