/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
* Append new socket option to flowopt queue.
*
* \param fo The flowopt queue to append to.
- * \param lev Level at which \opt resides.
+ * \param lev Level at which \a opt resides.
* \param opt New option to add.
* \param name Stringified name of \a opt.
* \param val The value to set \a opt to.
/**
* Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
*
- * \param l3type The layer-3 type (\p AF_INET, \p AF_INET6, \p AF_UNSPEC).
* \param l4type The layer-4 type (\p IPPROTO_xxx).
* \param passive Whether this is a passive (1) or active (0) socket.
* \param host Remote or local hostname or IPv/6 address string.
*
* \sa ipv6(7), getaddrinfo(3), bind(2), connect(2).
*/
-int makesock(unsigned l3type, unsigned l4type, int passive,
- const char *host, unsigned short port_number,
+int makesock(unsigned l4type, bool passive,
+ const char *host, uint16_t port_number,
struct flowopts *fo)
{
struct addrinfo *local = NULL, *src,
*remote = NULL, *dst, hints;
+ unsigned int l3type = AF_UNSPEC;
int rc, on = 1, sockfd = -1,
socktype = sock_type(l4type);
char port[6]; /* port number has at most 5 digits */
goto get_next_dst;
/*
- * Set those options that need to be set before establishing
- * the connection. Reuse the address on passive (listening)
- * sockets to avoid failure on restart.
+ * 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) {
+ &on, sizeof(on)) == -1) {
+ rc = errno;
+ close(sockfd);
PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
- strerror(errno));
- return -ERRNO_TO_PARA_ERROR(errno);
+ strerror(rc));
+ return -ERRNO_TO_PARA_ERROR(rc);
}
flowopt_setopts(sockfd, fo);
flowopt_cleanup(fo);
if (src == NULL && dst == NULL) {
+ rc = errno;
PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
layer4_name(l4type), host? host : (passive?
"[loopback]" : "[localhost]"), port);
- return -ERRNO_TO_PARA_ERROR(errno);
+ return -ERRNO_TO_PARA_ERROR(rc);
}
return sockfd;
}
/**
* Create a passive / listening socket.
*
- * \param l3type The network-layer type (\p AF_xxx).
* \param l4type The transport-layer type (\p IPPROTO_xxx).
* \param port The decimal port number to listen on.
+ * \param fo Flowopts (if any) to set before starting to listen.
*
* \return Positive integer (socket descriptor) on success, negative value
* otherwise.
*
* \sa makesock(), ip(7), ipv6(7), bind(2), listen(2).
*/
-int para_listen(unsigned l3type, unsigned l4type, unsigned short port)
+int para_listen(unsigned l4type, uint16_t port, struct flowopts *fo)
{
- int ret, fd = makesock(l3type, l4type, 1, NULL, port, NULL);
+ int ret, fd = makesock(l4type, 1, NULL, port, fo);
if (fd > 0) {
ret = listen(fd, BACKLOG);
if (ret < 0) {
+ ret = errno;
close(fd);
- return -ERRNO_TO_PARA_ERROR(errno);
+ return -ERRNO_TO_PARA_ERROR(ret);
}
PARA_INFO_LOG("listening on %s port %u, fd %d\n",
layer4_name(l4type), port, fd);
* Wrapper around the accept system call.
*
* \param fd The listening socket.
+ * \param rfds An optional fd_set pointer.
* \param addr Structure which is filled in with the address of the peer socket.
* \param size Should contain the size of the structure pointed to by \a addr.
+ * \param new_fd Result pointer.
*
- * Accept incoming connections on \a addr. Retry if interrupted.
+ * Accept incoming connections on \a addr, retry if interrupted. If \a rfds is
+ * not \p NULL, return 0 if \a fd is not set in \a rfds without calling accept().
*
- * \return The new file descriptor on success, negative on errors.
+ * \return Negative on errors, zero if no connections are present to be accepted,
+ * one otherwise.
*
* \sa accept(2).
*/
-int para_accept(int fd, void *addr, socklen_t size)
+int para_accept(int fd, fd_set *rfds, void *addr, socklen_t size, int *new_fd)
{
- int new_fd;
+ int ret;
+ if (rfds && !FD_ISSET(fd, rfds))
+ return 0;
do
- new_fd = accept(fd, (struct sockaddr *) addr, &size);
- while (new_fd < 0 && errno == EINTR);
- return new_fd < 0? -ERRNO_TO_PARA_ERROR(errno) : new_fd;
+ ret = accept(fd, (struct sockaddr *) addr, &size);
+ while (ret < 0 && errno == EINTR);
+
+ if (ret >= 0) {
+ *new_fd = ret;
+ return 1;
+ }
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ return 0;
+ return -ERRNO_TO_PARA_ERROR(errno);
}
/**
- * Probe the list of DCCP CCIDs supported locally by the host.
- * \param ccids Array to be filled in.
- * \param nccids Length of \a ccids.
- * \return Pointer to \a ccids, NULL on failure.
+ * Probe the list of DCCP CCIDs configured on this host.
+ * \param ccid_array Pointer to return statically allocated array in.
+ * \return Number of elements returned in \a ccid_array or error.
*
* NB: This feature is only available on Linux > 2.6.30; on older kernels
* ENOPROTOOPT ("Protocol not available") will be returned.
*/
-const uint8_t *dccp_available_ccids(uint8_t *ccids, uint8_t *nccids)
+int dccp_available_ccids(uint8_t **ccid_array)
{
- int fd = makesock(AF_UNSPEC, IPPROTO_DCCP, 1, NULL, 0, NULL);
+ static uint8_t ccids[DCCP_MAX_HOST_CCIDS];
+ socklen_t nccids = sizeof(ccids);
+ int ret, fd;
- if (fd < 0)
- return NULL;
+ ret = fd = makesock(IPPROTO_DCCP, 1, NULL, 0, NULL);
+ if (ret < 0)
+ return ret;
if (getsockopt(fd, SOL_DCCP, DCCP_SOCKOPT_AVAILABLE_CCIDS,
- ccids, (socklen_t *)nccids) < 0) {
+ ccids, &nccids) < 0) {
+ ret = errno;
+ close(fd);
PARA_ERROR_LOG("No DCCP_SOCKOPT_AVAILABLE_CCIDS: %s\n",
- strerror(errno));
- *nccids = 0;
+ strerror(ret));
+ return -ERRNO_TO_PARA_ERROR(ret);
}
- close(fd);
- return *nccids ? ccids : NULL;
+ close(fd);
+ *ccid_array = ccids;
+ return nccids;
}
/**
return result;
}
#endif /* HAVE_UCRED */
-
-/**
- * Receive a buffer and check for a pattern.
- *
- * \param fd The file descriptor to receive from.
- * \param pattern The expected pattern.
- * \param bufsize The size of the internal buffer.
- *
- * \return Positive if \a pattern was received, negative otherwise.
- *
- * This function tries to receive at most \a bufsize bytes from file descriptor
- * \a fd. If at least \p strlen(\a pattern) bytes were received, the beginning
- * of the received buffer is compared with \a pattern, ignoring case.
- *
- * \sa recv_buffer(), \sa strncasecmp(3).
- */
-int recv_pattern(int fd, const char *pattern, size_t bufsize)
-{
- size_t len = strlen(pattern);
- char *buf = para_malloc(bufsize + 1);
- int ret = -E_RECV_PATTERN, n = recv_buffer(fd, buf, bufsize + 1);
-
- if (n < len)
- goto out;
- if (strncasecmp(buf, pattern, len))
- goto out;
- ret = 1;
-out:
- if (ret < 0) {
- PARA_NOTICE_LOG("did not receive pattern '%s'\n", pattern);
- if (n > 0)
- PARA_NOTICE_LOG("recvd %d bytes: %s\n", n, buf);
- else if (n < 0)
- PARA_NOTICE_LOG("%s\n", para_strerror(-n));
- }
- free(buf);
- return ret;
-}
projects / paraslash.git / blobdiff