/*
- * 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.
*/
*/
#define _GNU_SOURCE
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <sys/socket.h>
#include <netdb.h>
/* At least NetBSD needs these. */
if (*o++ != ']' || (*o != '\0' && *o != ':'))
goto failed;
} else {
- for (; (*c = *o == ':'? '\0' : *o); c++, o++)
- if (c == end)
+ for (; (*c = *o == ':'? '\0' : *o); c++, o++) {
+ if (c == end && o[1])
goto failed;
+ }
}
if (*o == ':')
if (para_atoi32(++o, port) < 0 ||
*port < 0 || *port > 0xffff)
goto failed;
-
if (host_string_ok(host))
return host;
failed:
}
}
-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;
}
/**
- * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
+ * Resolve an IPv4/IPv6 address.
*
* \param l4type The layer-4 type (\p IPPROTO_xxx).
- * \param passive Whether this is a passive (1) or active (0) socket.
+ * \param passive Whether \p AI_PASSIVE should be included as hint.
* \param host Remote or local hostname or IPv/6 address string.
- * \param port_number Decimal port number.
- * \param fo Socket options to be set before making the connection.
+ * \param port_number Used to set the port in each returned address structure.
+ * \param result addrinfo structures are returned here.
*
- * This creates a ready-made IPv4/v6 socket structure after looking up the
- * necessary parameters. The interpretation of \a host depends on the value of
- * \a passive:
- * - on a passive socket host is interpreted as an interface IPv4/6 address
- * (can be left NULL);
- * - on an active socket, \a host is the peer DNS name or IPv4/6 address
- * to connect to;
- * - \a port_number is in either case the numeric port number (not service
- * string).
- *
- * Furthermore, 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.
- *
- * \return This function returns 1 on success and \a -E_ADDRESS_LOOKUP when no
- * matching connection could be set up (with details in the error log).
- *
- * \sa ipv6(7), getaddrinfo(3), bind(2), connect(2).
- */
-int makesock(unsigned l4type, bool passive,
- const char *host, uint16_t port_number,
- struct flowopts *fo)
-{
- struct addrinfo *local = NULL, *src = NULL, *remote = NULL,
- *dst = NULL, hints;
- unsigned int l3type = AF_UNSPEC;
- int rc, on = 1, sockfd = -1,
- socktype = sock_type(l4type);
+ * The interpretation of \a host depends on the value of \a passive. On a
+ * passive socket host is interpreted as an interface IPv4/6 address (can be
+ * left NULL). On an active socket, \a host is the peer DNS name or IPv4/6
+ * address to connect to.
+ *
+ * \return Standard.
+ *
+ * \sa getaddrinfo(3).
+ */
+int lookup_address(unsigned l4type, bool passive, const char *host,
+ int port_number, struct addrinfo **result)
+{
+ int ret;
char port[6]; /* port number has at most 5 digits */
+ struct addrinfo *addr = NULL, hints;
- sprintf(port, "%u", port_number);
+ *result = NULL;
+ sprintf(port, "%u", port_number & 0xffff);
/* Set up address hint structure */
memset(&hints, 0, sizeof(hints));
- hints.ai_family = l3type;
- hints.ai_socktype = socktype;
- /*
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = sock_type(l4type);
+ /*
* getaddrinfo does not support SOCK_DCCP, so for the sake of lookup
* (and only then) pretend to be UDP.
*/
if (l4type == IPPROTO_DCCP)
hints.ai_socktype = SOCK_DGRAM;
-
/* only use addresses available on the host */
hints.ai_flags = AI_ADDRCONFIG;
- if (l3type == AF_INET6)
- /* use v4-mapped-v6 if no v6 addresses found */
- hints.ai_flags |= AI_V4MAPPED | AI_ALL;
-
if (passive && host == NULL)
hints.ai_flags |= AI_PASSIVE;
-
/* Obtain local/remote address information */
- if ((rc = getaddrinfo(host, port, &hints, passive ? &local : &remote))) {
- PARA_ERROR_LOG("can not resolve %s address %s#%s: %s.\n",
- layer4_name(l4type),
- host? host : (passive? "[loopback]" : "[localhost]"),
- port, gai_strerror(rc));
- rc = -E_ADDRESS_LOOKUP;
- goto out;
+ ret = getaddrinfo(host, port, &hints, &addr);
+ if (ret != 0) {
+ PARA_ERROR_LOG("can not resolve %s address %s#%s: %s\n",
+ layer4_name(l4type),
+ host? host : (passive? "[loopback]" : "[localhost]"),
+ port, gai_strerror(ret));
+ return -E_ADDRESS_LOOKUP;
}
+ *result = addr;
+ return 1;
+}
- /* Iterate over all src/dst combination, exhausting dst first */
- for (src = local, dst = remote; src != NULL || dst != NULL; /* no op */ ) {
- if (src && dst && src->ai_family == AF_INET
- && dst->ai_family == AF_INET6)
- goto get_next_dst; /* v4 -> v6 is not possible */
-
- sockfd = socket(src ? src->ai_family : dst->ai_family,
- socktype, l4type);
- if (sockfd < 0)
- goto get_next_dst;
+/**
+ * Create an active or passive socket.
+ *
+ * \param l4type \p IPPROTO_TCP, \p IPPROTO_UDP, or \p IPPROTO_DCCP.
+ * \param passive Whether to call bind(2) or connect(2).
+ * \param ai Address information as obtained from \ref lookup_address().
+ * \param fo Socket options to be set before making the connection.
+ *
+ * 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 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).
+ */
+int makesock_addrinfo(unsigned l4type, bool passive, struct addrinfo *ai,
+ struct flowopts *fo)
+{
+ int ret = -E_MAKESOCK, on = 1;
+ for (; ai; ai = ai->ai_next) {
+ int fd;
+ ret = socket(ai->ai_family, sock_type(l4type), l4type);
+ if (ret < 0)
+ 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) {
- rc = errno;
- close(sockfd);
- PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
- strerror(rc));
- rc = -ERRNO_TO_PARA_ERROR(rc);
- break;
- }
- flowopt_setopts(sockfd, fo);
-
- if (src) {
- if (bind(sockfd, src->ai_addr, src->ai_addrlen) < 0) {
- close(sockfd);
- goto get_next_src;
- }
- if (!dst) /* bind-only completed successfully */
- break;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on,
+ sizeof(on)) == -1) {
+ close(fd);
+ continue;
}
-
- if (dst && connect(sockfd, dst->ai_addr, dst->ai_addrlen) == 0)
- break; /* connection completed successfully */
- 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;
}
-out:
- if (local)
- freeaddrinfo(local);
- if (remote)
- freeaddrinfo(remote);
- flowopt_cleanup(fo);
-
- if (src == NULL && dst == NULL) {
- if (rc >= 0)
- rc = -E_MAKESOCK;
- PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
- layer4_name(l4type), host? host : (passive?
- "[loopback]" : "[localhost]"), port);
- return rc;
+ return -E_MAKESOCK;
+}
+
+/**
+ * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
+ *
+ * \param l4type The layer-4 type (\p IPPROTO_xxx).
+ * \param passive Whether this is a passive or active socket.
+ * \param host Passed to \ref lookup_address().
+ * \param port_number Passed to \ref lookup_address().
+ * \param fo Passed to \ref makesock_addrinfo().
+ *
+ * This creates a ready-made IPv4/v6 socket structure after looking up the
+ * necessary parameters. The function first calls \ref lookup_address() and
+ * passes the address information to makesock_addrinfo() to create and
+ * initialize the socket.
+ *
+ * \return The newly created file descriptor on success, a negative error code
+ * on failure.
+ *
+ * \sa \ref lookup_address(), \ref makesock_addrinfo().
+ */
+int makesock(unsigned l4type, bool passive, const char *host, uint16_t port_number,
+ struct flowopts *fo)
+{
+ struct addrinfo *ai;
+ int ret = lookup_address(l4type, passive, host, port_number, &ai);
+
+ if (ret >= 0)
+ ret = makesock_addrinfo(l4type, passive, ai, fo);
+ if (ai)
+ freeaddrinfo(ai);
+ if (ret < 0) {
+ PARA_ERROR_LOG("can not create %s socket %s#%d.\n",
+ layer4_name(l4type), host? host : (passive?
+ "[loopback]" : "[localhost]"), port_number);
}
- return sockfd;
+ return ret;
}
/**
*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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