395 lines
12 KiB
C
395 lines
12 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <arpa/inet.h>
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#include <errno.h>
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#include <net/if.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "errno-util.h"
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#include "extract-word.h"
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#include "log.h"
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#include "memory-util.h"
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#include "netlink-util.h"
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#include "parse-util.h"
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#include "socket-netlink.h"
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#include "socket-util.h"
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#include "string-util.h"
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int resolve_ifname(sd_netlink **rtnl, const char *name) {
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int r;
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/* Like if_nametoindex, but resolves "alternative names" too. */
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assert(name);
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r = if_nametoindex(name);
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if (r > 0)
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return r;
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return rtnl_resolve_link_alternative_name(rtnl, name);
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}
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int resolve_interface(sd_netlink **rtnl, const char *name) {
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int r;
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/* Like resolve_ifname, but resolves interface numbers too. */
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assert(name);
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r = parse_ifindex(name);
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if (r > 0)
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return r;
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assert(r < 0);
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return resolve_ifname(rtnl, name);
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}
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int resolve_interface_or_warn(sd_netlink **rtnl, const char *name) {
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int r;
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r = resolve_interface(rtnl, name);
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if (r < 0)
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return log_error_errno(r, "Failed to resolve interface \"%s\": %m", name);
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return r;
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}
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int socket_address_parse(SocketAddress *a, const char *s) {
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_cleanup_free_ char *n = NULL;
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char *e;
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int r;
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assert(a);
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assert(s);
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*a = (SocketAddress) {
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.type = SOCK_STREAM,
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};
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if (*s == '[') {
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uint16_t port;
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/* IPv6 in [x:.....:z]:p notation */
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e = strchr(s+1, ']');
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if (!e)
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return -EINVAL;
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n = strndup(s+1, e-s-1);
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if (!n)
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return -ENOMEM;
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errno = 0;
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if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0)
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return errno_or_else(EINVAL);
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e++;
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if (*e != ':')
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return -EINVAL;
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e++;
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r = parse_ip_port(e, &port);
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if (r < 0)
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return r;
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htobe16(port);
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a->size = sizeof(struct sockaddr_in6);
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} else if (*s == '/') {
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/* AF_UNIX socket */
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size_t l;
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l = strlen(s);
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if (l >= sizeof(a->sockaddr.un.sun_path)) /* Note that we refuse non-NUL-terminated sockets when
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* parsing (the kernel itself is less strict here in what it
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* accepts) */
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path, s, l);
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a->size = offsetof(struct sockaddr_un, sun_path) + l + 1;
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} else if (*s == '@') {
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/* Abstract AF_UNIX socket */
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size_t l;
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l = strlen(s+1);
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if (l >= sizeof(a->sockaddr.un.sun_path) - 1) /* Note that we refuse non-NUL-terminated sockets here
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* when parsing, even though abstract namespace sockets
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* explicitly allow embedded NUL bytes and don't consider
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* them special. But it's simply annoying to debug such
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* sockets. */
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path+1, s+1, l);
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a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
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} else if (startswith(s, "vsock:")) {
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/* AF_VSOCK socket in vsock:cid:port notation */
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const char *cid_start = s + STRLEN("vsock:");
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unsigned port;
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e = strchr(cid_start, ':');
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if (!e)
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return -EINVAL;
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r = safe_atou(e+1, &port);
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if (r < 0)
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return r;
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n = strndup(cid_start, e - cid_start);
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if (!n)
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return -ENOMEM;
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if (!isempty(n)) {
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r = safe_atou(n, &a->sockaddr.vm.svm_cid);
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if (r < 0)
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return r;
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} else
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a->sockaddr.vm.svm_cid = VMADDR_CID_ANY;
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a->sockaddr.vm.svm_family = AF_VSOCK;
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a->sockaddr.vm.svm_port = port;
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a->size = sizeof(struct sockaddr_vm);
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} else {
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uint16_t port;
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e = strchr(s, ':');
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if (e) {
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r = parse_ip_port(e + 1, &port);
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if (r < 0)
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return r;
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n = strndup(s, e-s);
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if (!n)
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return -ENOMEM;
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/* IPv4 in w.x.y.z:p notation? */
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r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr);
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if (r < 0)
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return -errno;
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if (r > 0) {
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/* Gotcha, it's a traditional IPv4 address */
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a->sockaddr.in.sin_family = AF_INET;
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a->sockaddr.in.sin_port = htobe16(port);
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a->size = sizeof(struct sockaddr_in);
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} else {
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int idx;
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/* Uh, our last resort, an interface name */
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idx = resolve_ifname(NULL, n);
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if (idx < 0)
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return idx;
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htobe16(port);
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a->sockaddr.in6.sin6_scope_id = idx;
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a->sockaddr.in6.sin6_addr = in6addr_any;
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a->size = sizeof(struct sockaddr_in6);
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}
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} else {
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/* Just a port */
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r = parse_ip_port(s, &port);
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if (r < 0)
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return r;
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if (socket_ipv6_is_supported()) {
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htobe16(port);
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a->sockaddr.in6.sin6_addr = in6addr_any;
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a->size = sizeof(struct sockaddr_in6);
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} else {
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a->sockaddr.in.sin_family = AF_INET;
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a->sockaddr.in.sin_port = htobe16(port);
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a->sockaddr.in.sin_addr.s_addr = INADDR_ANY;
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a->size = sizeof(struct sockaddr_in);
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}
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}
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}
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return 0;
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}
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int socket_address_parse_and_warn(SocketAddress *a, const char *s) {
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SocketAddress b;
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int r;
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/* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */
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r = socket_address_parse(&b, s);
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if (r < 0)
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return r;
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if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) {
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log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
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return -EAFNOSUPPORT;
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}
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*a = b;
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return 0;
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}
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int socket_address_parse_netlink(SocketAddress *a, const char *s) {
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_cleanup_free_ char *word = NULL;
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unsigned group = 0;
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int family, r;
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assert(a);
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assert(s);
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*a = (SocketAddress) {
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.type = SOCK_RAW,
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};
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r = extract_first_word(&s, &word, NULL, 0);
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if (r < 0)
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return r;
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if (r == 0)
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return -EINVAL;
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family = netlink_family_from_string(word);
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if (family < 0)
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return -EINVAL;
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if (!isempty(s)) {
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r = safe_atou(s, &group);
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if (r < 0)
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return r;
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}
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a->sockaddr.nl.nl_family = AF_NETLINK;
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a->sockaddr.nl.nl_groups = group;
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a->type = SOCK_RAW;
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a->size = sizeof(struct sockaddr_nl);
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a->protocol = family;
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return 0;
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}
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bool socket_address_is(const SocketAddress *a, const char *s, int type) {
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struct SocketAddress b;
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assert(a);
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assert(s);
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if (socket_address_parse(&b, s) < 0)
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return false;
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b.type = type;
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return socket_address_equal(a, &b);
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}
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bool socket_address_is_netlink(const SocketAddress *a, const char *s) {
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struct SocketAddress b;
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assert(a);
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assert(s);
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if (socket_address_parse_netlink(&b, s) < 0)
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return false;
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return socket_address_equal(a, &b);
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}
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int make_socket_fd(int log_level, const char* address, int type, int flags) {
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SocketAddress a;
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int fd, r;
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r = socket_address_parse(&a, address);
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if (r < 0)
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return log_error_errno(r, "Failed to parse socket address \"%s\": %m", address);
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a.type = type;
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fd = socket_address_listen(&a, type | flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT,
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NULL, false, false, false, 0755, 0644, NULL);
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if (fd < 0 || log_get_max_level() >= log_level) {
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_cleanup_free_ char *p = NULL;
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r = socket_address_print(&a, &p);
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if (r < 0)
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return log_error_errno(r, "socket_address_print(): %m");
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if (fd < 0)
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log_error_errno(fd, "Failed to listen on %s: %m", p);
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else
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log_full(log_level, "Listening on %s", p);
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}
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return fd;
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}
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int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret_addr, int *ret_ifindex) {
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_cleanup_free_ char *buf = NULL;
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const char *suffix;
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int r, ifindex = 0;
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assert(s);
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assert(family);
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assert(ret_addr);
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/* Similar to in_addr_from_string_auto() but also parses an optionally appended IPv6 zone suffix ("scope id")
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* if one is found. */
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suffix = strchr(s, '%');
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if (suffix) {
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if (ret_ifindex) {
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/* If we shall return the interface index, try to parse it */
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ifindex = resolve_interface(NULL, suffix + 1);
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if (ifindex < 0)
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return ifindex;
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}
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s = buf = strndup(s, suffix - s);
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if (!buf)
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return -ENOMEM;
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}
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r = in_addr_from_string_auto(s, family, ret_addr);
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if (r < 0)
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return r;
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if (ret_ifindex)
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*ret_ifindex = ifindex;
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return r;
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}
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int in_addr_ifindex_name_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex, char **server_name) {
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_cleanup_free_ char *buf = NULL, *name = NULL;
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const char *m;
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int r;
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assert(s);
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m = strchr(s, '#');
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if (m) {
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name = strdup(m+1);
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if (!name)
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return -ENOMEM;
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buf = strndup(s, m - s);
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if (!buf)
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return -ENOMEM;
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s = buf;
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}
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r = in_addr_ifindex_from_string_auto(s, family, ret, ifindex);
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if (r < 0)
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return r;
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if (server_name)
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*server_name = TAKE_PTR(name);
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return r;
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}
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