/*
- * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2014 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
}
}
-static void flowopt_cleanup(struct flowopts *fo)
+/**
+ * Deallocate all resources of a flowopts structure.
+ *
+ * \param fo A pointer as returned from flowopt_new().
+ *
+ * It's OK to pass \p NULL here in which case the function does nothing.
+ */
+void flowopt_cleanup(struct flowopts *fo)
{
struct pre_conn_opt *cur, *next;
free(fo);
}
-/*
+/**
* Resolve an IPv4/IPv6 address.
*
* \param l4type The layer-4 type (\p IPPROTO_xxx).
*
* \sa getaddrinfo(3).
*/
-static int lookup_address(unsigned l4type, bool passive, const char *host,
+int lookup_address(unsigned l4type, bool passive, const char *host,
int port_number, struct addrinfo **result)
{
int ret;
return 1;
}
-/*
+/**
* Create an active or passive socket.
*
* \param l4type \p IPPROTO_TCP, \p IPPROTO_UDP, or \p IPPROTO_DCCP.
*
* bind(2) is called on passive sockets, and connect(2) on active sockets. The
* algorithm tries all possible address combinations until it succeeds. If \a
- * fo is supplied, options are set and cleanup is performed.
+ * fo is supplied, options are set but cleanup must be performed in the caller.
*
* \return File descriptor on success, \p E_MAKESOCK on errors.
*
* \sa \ref lookup_address(), \ref makesock(), ip(7), ipv6(7), bind(2),
* connect(2).
*/
-static int makesock_addrinfo(unsigned l4type, bool passive, struct addrinfo *ai,
+int makesock_addrinfo(unsigned l4type, bool passive, struct addrinfo *ai,
struct flowopts *fo)
{
- struct addrinfo *local, *remote, *src, *dst;
- int ret = -E_MAKESOCK, on = 1, sockfd = -1;
+ int ret = -E_MAKESOCK, on = 1;
- if (passive) {
- local = ai;
- remote = NULL;
- } else {
- local = NULL;
- remote = ai;
- }
-
- /* Iterate over all src/dst combination, exhausting dst first */
- for (src = local, dst = remote; src != NULL || dst != NULL; /* no op */ ) {
- ret = socket(src ? src->ai_family : dst->ai_family,
- sock_type(l4type), l4type);
+ for (; ai; ai = ai->ai_next) {
+ int fd;
+ ret = socket(ai->ai_family, sock_type(l4type), l4type);
if (ret < 0)
- goto get_next_dst;
- sockfd = ret;
- flowopt_setopts(sockfd, fo);
+ continue;
+ fd = ret;
+ flowopt_setopts(fd, fo);
+ if (!passive) {
+ if (connect(fd, ai->ai_addr, ai->ai_addrlen) == 0)
+ return fd;
+ close(fd);
+ continue;
+ }
/*
* Reuse the address on passive sockets to avoid failure on
* restart (protocols using listen()) and when creating
* multiple listener instances (UDP multicast).
*/
- if (passive && setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
- &on, sizeof(on)) == -1) {
- ret = -ERRNO_TO_PARA_ERROR(errno);
- close(sockfd);
- PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
- para_strerror(-ret));
- break;
- }
-
- if (passive) {
- if (bind(sockfd, src->ai_addr, src->ai_addrlen) < 0) {
- close(sockfd);
- goto get_next_src;
- }
- /* bind completed successfully */
- break;
- } else {
- if (connect(sockfd, dst->ai_addr, dst->ai_addrlen) == 0)
- break; /* connection completed successfully */
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on,
+ sizeof(on)) == -1) {
+ close(fd);
+ continue;
}
- close(sockfd);
-get_next_dst:
- if (dst && (dst = dst->ai_next))
+ if (bind(fd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ close(fd);
continue;
-get_next_src:
- if (src && (src = src->ai_next)) /* restart inner loop */
- dst = remote;
+ }
+ return fd;
}
- if (src == NULL && dst == NULL)
- return ret < 0? ret : -E_MAKESOCK;
- return sockfd;
+ return -E_MAKESOCK;
}
/**
ret = makesock_addrinfo(l4type, passive, ai, fo);
if (ai)
freeaddrinfo(ai);
- flowopt_cleanup(fo);
if (ret < 0) {
PARA_ERROR_LOG("can not create %s socket %s#%d.\n",
layer4_name(l4type), host? host : (passive?
*ia = ((struct sockaddr_in *)sa)->sin_addr;
}
+/**
+ * Compare the address part of IPv4/6 addresses.
+ *
+ * \param sa1 First address.
+ * \param sa2 Second address.
+ *
+ * \return True iff the IP address of \a sa1 and \a sa2 match.
+ */
+bool sockaddr_equal(const struct sockaddr *sa1, const struct sockaddr *sa2)
+{
+ if (!sa1 || !sa2)
+ return false;
+ if (sa1->sa_family != sa2->sa_family)
+ return false;
+ if (sa1->sa_family == AF_INET) {
+ struct sockaddr_in *a1 = (typeof(a1))sa1,
+ *a2 = (typeof (a2))sa2;
+ return a1->sin_addr.s_addr == a2->sin_addr.s_addr;
+ } else if (sa1->sa_family == AF_INET6) {
+ struct sockaddr_in6 *a1 = (typeof(a1))sa1,
+ *a2 = (typeof (a2))sa2;
+ return !memcmp(a1, a2, sizeof(*a1));
+ } else
+ return false;
+}
+
/**
* Receive data from a file descriptor.
*
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