/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include "alloc-util.h" #include "errno-util.h" #include "extract-word.h" #include "log.h" #include "memory-util.h" #include "netlink-util.h" #include "parse-util.h" #include "socket-netlink.h" #include "socket-util.h" #include "string-util.h" int socket_address_parse(SocketAddress *a, const char *s) { _cleanup_free_ char *n = NULL; char *e; int r; assert(a); assert(s); if (IN_SET(*s, '/', '@')) { /* AF_UNIX socket */ struct sockaddr_un un; r = sockaddr_un_set_path(&un, s); if (r < 0) return r; *a = (SocketAddress) { .sockaddr.un = un, .size = r, }; } else if (startswith(s, "vsock:")) { /* AF_VSOCK socket in vsock:cid:port notation */ const char *cid_start = s + STRLEN("vsock:"); unsigned port, cid; e = strchr(cid_start, ':'); if (!e) return -EINVAL; r = safe_atou(e+1, &port); if (r < 0) return r; n = strndup(cid_start, e - cid_start); if (!n) return -ENOMEM; if (isempty(n)) cid = VMADDR_CID_ANY; else { r = safe_atou(n, &cid); if (r < 0) return r; } *a = (SocketAddress) { .sockaddr.vm = { .svm_cid = cid, .svm_family = AF_VSOCK, .svm_port = port, }, .size = sizeof(struct sockaddr_vm), }; } else { uint16_t port; r = parse_ip_port(s, &port); if (r == -ERANGE) return r; /* Valid port syntax, but the numerical value is wrong for a port. */ if (r >= 0) { /* Just a port */ if (socket_ipv6_is_supported()) *a = (SocketAddress) { .sockaddr.in6 = { .sin6_family = AF_INET6, .sin6_port = htobe16(port), .sin6_addr = in6addr_any, }, .size = sizeof(struct sockaddr_in6), }; else *a = (SocketAddress) { .sockaddr.in = { .sin_family = AF_INET, .sin_port = htobe16(port), .sin_addr.s_addr = INADDR_ANY, }, .size = sizeof(struct sockaddr_in), }; } else { union in_addr_union address; int family, ifindex; r = in_addr_port_ifindex_name_from_string_auto(s, &family, &address, &port, &ifindex, NULL); if (r < 0) return r; if (port == 0) /* No port, no go. */ return -EINVAL; if (family == AF_INET) *a = (SocketAddress) { .sockaddr.in = { .sin_family = AF_INET, .sin_addr = address.in, .sin_port = htobe16(port), }, .size = sizeof(struct sockaddr_in), }; else if (family == AF_INET6) *a = (SocketAddress) { .sockaddr.in6 = { .sin6_family = AF_INET6, .sin6_addr = address.in6, .sin6_port = htobe16(port), .sin6_scope_id = ifindex, }, .size = sizeof(struct sockaddr_in6), }; else assert_not_reached(); } } return 0; } int socket_address_parse_and_warn(SocketAddress *a, const char *s) { SocketAddress b; int r; /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ r = socket_address_parse(&b, s); if (r < 0) return r; if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); return -EAFNOSUPPORT; } *a = b; return 0; } int socket_address_parse_netlink(SocketAddress *a, const char *s) { _cleanup_free_ char *word = NULL; unsigned group = 0; int family, r; assert(a); assert(s); r = extract_first_word(&s, &word, NULL, 0); if (r < 0) return r; if (r == 0) return -EINVAL; family = netlink_family_from_string(word); if (family < 0) return -EINVAL; if (!isempty(s)) { r = safe_atou(s, &group); if (r < 0) return r; } *a = (SocketAddress) { .type = SOCK_RAW, .sockaddr.nl.nl_family = AF_NETLINK, .sockaddr.nl.nl_groups = group, .protocol = family, .size = sizeof(struct sockaddr_nl), }; return 0; } bool socket_address_is(const SocketAddress *a, const char *s, int type) { struct SocketAddress b; assert(a); assert(s); if (socket_address_parse(&b, s) < 0) return false; b.type = type; return socket_address_equal(a, &b); } bool socket_address_is_netlink(const SocketAddress *a, const char *s) { struct SocketAddress b; assert(a); assert(s); if (socket_address_parse_netlink(&b, s) < 0) return false; return socket_address_equal(a, &b); } int make_socket_fd(int log_level, const char* address, int type, int flags) { SocketAddress a; int fd, r; r = socket_address_parse(&a, address); if (r < 0) return log_error_errno(r, "Failed to parse socket address \"%s\": %m", address); a.type = type; fd = socket_address_listen(&a, type | flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT, NULL, false, false, false, 0755, 0644, NULL); if (fd < 0 || log_get_max_level() >= log_level) { _cleanup_free_ char *p = NULL; r = socket_address_print(&a, &p); if (r < 0) return log_error_errno(r, "socket_address_print(): %m"); if (fd < 0) log_error_errno(fd, "Failed to listen on %s: %m", p); else log_full(log_level, "Listening on %s", p); } return fd; } int in_addr_port_ifindex_name_from_string_auto( const char *s, int *ret_family, union in_addr_union *ret_address, uint16_t *ret_port, int *ret_ifindex, char **ret_server_name) { _cleanup_free_ char *buf1 = NULL, *buf2 = NULL, *name = NULL; int family, ifindex = 0, r; union in_addr_union a; uint16_t port = 0; const char *m; assert(s); /* This accepts the following: * 192.168.0.1:53#example.com * [2001:4860:4860::8888]:53%eth0#example.com * * If ret_port is NULL, then the port cannot be specified. * If ret_ifindex is NULL, then the interface index cannot be specified. * If ret_server_name is NULL, then server_name cannot be specified. * * ret_family is always AF_INET or AF_INET6. */ m = strchr(s, '#'); if (m) { if (!ret_server_name) return -EINVAL; if (isempty(m + 1)) return -EINVAL; name = strdup(m + 1); if (!name) return -ENOMEM; s = buf1 = strndup(s, m - s); if (!buf1) return -ENOMEM; } m = strchr(s, '%'); if (m) { if (!ret_ifindex) return -EINVAL; if (isempty(m + 1)) return -EINVAL; if (!ifname_valid_full(m + 1, IFNAME_VALID_ALTERNATIVE | IFNAME_VALID_NUMERIC)) return -EINVAL; /* We want to return -EINVAL for syntactically invalid names, * and -ENODEV for valid but nonexistent interfaces. */ ifindex = rtnl_resolve_interface(NULL, m + 1); if (ifindex < 0) return ifindex; s = buf2 = strndup(s, m - s); if (!buf2) return -ENOMEM; } m = strrchr(s, ':'); if (m) { if (*s == '[') { _cleanup_free_ char *ip_str = NULL; if (!ret_port) return -EINVAL; if (*(m - 1) != ']') return -EINVAL; family = AF_INET6; r = parse_ip_port(m + 1, &port); if (r < 0) return r; ip_str = strndup(s + 1, m - s - 2); if (!ip_str) return -ENOMEM; r = in_addr_from_string(family, ip_str, &a); if (r < 0) return r; } else { /* First try to parse the string as IPv6 address without port number */ r = in_addr_from_string(AF_INET6, s, &a); if (r < 0) { /* Then the input should be IPv4 address with port number */ _cleanup_free_ char *ip_str = NULL; if (!ret_port) return -EINVAL; family = AF_INET; ip_str = strndup(s, m - s); if (!ip_str) return -ENOMEM; r = in_addr_from_string(family, ip_str, &a); if (r < 0) return r; r = parse_ip_port(m + 1, &port); if (r < 0) return r; } else family = AF_INET6; } } else { family = AF_INET; r = in_addr_from_string(family, s, &a); if (r < 0) return r; } if (ret_family) *ret_family = family; if (ret_address) *ret_address = a; if (ret_port) *ret_port = port; if (ret_ifindex) *ret_ifindex = ifindex; if (ret_server_name) *ret_server_name = TAKE_PTR(name); return r; } struct in_addr_full *in_addr_full_free(struct in_addr_full *a) { if (!a) return NULL; free(a->server_name); free(a->cached_server_string); return mfree(a); } int in_addr_full_new( int family, const union in_addr_union *a, uint16_t port, int ifindex, const char *server_name, struct in_addr_full **ret) { _cleanup_free_ char *name = NULL; struct in_addr_full *x; assert(ret); if (!isempty(server_name)) { name = strdup(server_name); if (!name) return -ENOMEM; } x = new(struct in_addr_full, 1); if (!x) return -ENOMEM; *x = (struct in_addr_full) { .family = family, .address = *a, .port = port, .ifindex = ifindex, .server_name = TAKE_PTR(name), }; *ret = x; return 0; } int in_addr_full_new_from_string(const char *s, struct in_addr_full **ret) { _cleanup_free_ char *server_name = NULL; int family, ifindex, r; union in_addr_union a; uint16_t port; assert(s); r = in_addr_port_ifindex_name_from_string_auto(s, &family, &a, &port, &ifindex, &server_name); if (r < 0) return r; return in_addr_full_new(family, &a, port, ifindex, server_name, ret); } const char *in_addr_full_to_string(struct in_addr_full *a) { assert(a); if (!a->cached_server_string) (void) in_addr_port_ifindex_name_to_string( a->family, &a->address, a->port, a->ifindex, a->server_name, &a->cached_server_string); return a->cached_server_string; }