/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#define AI_ADDRCONFIG 0
#endif
-#include <dirent.h>
#include <regex.h>
-#include <openssl/rc4.h>
#include "para.h"
#include "error.h"
-#include "crypt.h"
#include "net.h"
#include "string.h"
+#include "list.h"
#include "fd.h"
/**
* \param hostlen The maximum length of \a host.
* \param port To return the port number (if any) of \a url.
*
- * \return Pointer to \a host, or NULL if failed.
- * If NULL is returned, \a host and \a portnum are undefined. If no
- * port number was present in \a url, \a portnum is set to -1.
+ * \return Pointer to \a host, or \p NULL if failed. If \p NULL is returned,
+ * \a host and \a port are undefined. If no port number was present in \a url,
+ * \a port is set to -1.
*
* \sa RFC 3986, 3.2.2/3.2.3
*/
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:
return NULL;
}
+/**
+ * Stringify port number, resolve into service name where defined.
+ * \param port 2-byte port number, in host-byte-order.
+ * \param transport Transport protocol name (e.g. "udp", "tcp"), or NULL.
+ * \return Pointer to static result buffer.
+ *
+ * \sa getservent(3), services(5), nsswitch.conf(5)
+ */
+const char *stringify_port(int port, const char *transport)
+{
+ static char service[NI_MAXSERV];
+
+ if (port < 0 || port > 0xFFFF) {
+ snprintf(service, sizeof(service), "undefined (%d)", port);
+ } else {
+ struct servent *se = getservbyport(htons(port), transport);
+
+ if (se == NULL)
+ snprintf(service, sizeof(service), "%u", port);
+ else
+ snprintf(service, sizeof(service), "%s", se->s_name);
+ }
+ return service;
+}
+
/**
* Determine the socket type for a given layer-4 protocol.
*
}
/**
- * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
+ * Flowopts: Transport-layer independent encapsulation of socket options.
+ *
+ * These collect individual socket options into a queue, which is disposed of
+ * directly after makesock(). The 'pre_conn_opt' structure is for internal use
+ * only and should not be visible elsewhere.
+ *
+ * \sa setsockopt(2), makesock()
+ */
+struct pre_conn_opt {
+ int sock_level; /**< Second argument to setsockopt() */
+ int sock_option; /**< Third argument to setsockopt() */
+ char *opt_name; /**< Stringified \a sock_option */
+ void *opt_val; /**< Fourth argument to setsockopt() */
+ socklen_t opt_len; /**< Fifth argument to setsockopt() */
+
+ struct list_head node; /**< FIFO, as sockopt order matters. */
+};
+
+/** FIFO list of pre-connection socket options to be set */
+struct flowopts {
+ struct list_head sockopts;
+};
+
+/**
+ * Allocate and initialize a flowopt queue.
+ *
+ * \return A new structure to be passed to \ref flowopt_add(). It is
+ * automatically deallocated in \ref makesock().
+ */
+struct flowopts *flowopt_new(void)
+{
+ struct flowopts *new = para_malloc(sizeof(*new));
+
+ INIT_LIST_HEAD(&new->sockopts);
+ return new;
+}
+
+/**
+ * Append new socket option to flowopt queue.
+ *
+ * \param fo The flowopt queue to append to.
+ * \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.
+ * \param len Length of \a val.
+ *
+ * \sa setsockopt(2)
+ */
+void flowopt_add(struct flowopts *fo, int lev, int opt,
+ const char *name, const void *val, int len)
+{
+ struct pre_conn_opt *new = para_malloc(sizeof(*new));
+
+ new->sock_option = opt;
+ new->sock_level = lev;
+ new->opt_name = para_strdup(name);
+
+ if (val == NULL) {
+ new->opt_val = NULL;
+ new->opt_len = 0;
+ } else {
+ new->opt_val = para_malloc(len);
+ new->opt_len = len;
+ memcpy(new->opt_val, val, len);
+ }
+
+ list_add_tail(&new->node, &fo->sockopts);
+}
+
+/** Set the entire bunch of pre-connection options at once. */
+static void flowopt_setopts(int sockfd, struct flowopts *fo)
+{
+ struct pre_conn_opt *pc;
+
+ if (fo == NULL)
+ return;
+
+ list_for_each_entry(pc, &fo->sockopts, node)
+ if (setsockopt(sockfd, pc->sock_level, pc->sock_option,
+ pc->opt_val, pc->opt_len) < 0) {
+ PARA_EMERG_LOG("Can not set %s socket option: %s",
+ pc->opt_name, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void flowopt_cleanup(struct flowopts *fo)
+{
+ struct pre_conn_opt *cur, *next;
+
+ if (fo == NULL)
+ return;
+
+ list_for_each_entry_safe(cur, next, &fo->sockopts, node) {
+ free(cur->opt_name);
+ free(cur->opt_val);
+ free(cur);
+ }
+ free(fo);
+}
+
+/*
+ * Resolve an IPv4/IPv6 address.
*
- * \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 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 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.
- *
- * \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 l3type, unsigned l4type, int passive,
- const char *host, unsigned short port_number)
-{
- struct addrinfo *local = NULL, *src,
- *remote = NULL, *dst, hints;
- 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).
+ */
+static 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));
+ 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;
+}
+/**
+ * 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 \a lookup_address().
+ * \param port_number Passed to \ref \a lookup_address().
+ * \param fo Socket options to be set before making the connection.
+ *
+ * This creates a ready-made IPv4/v6 socket structure after looking up the
+ * necessary parameters.
+ *
+ * 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 Standard.
+ *
+ * \sa \ref lookup_address(), 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;
+ int rc, on = 1, sockfd = -1;
+
+ rc = lookup_address(l4type, passive, host, port_number, passive?
+ &local : &remote);
+ if (rc < 0)
+ goto out;
/* 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
goto get_next_dst; /* v4 -> v6 is not possible */
sockfd = socket(src ? src->ai_family : dst->ai_family,
- socktype, l4type);
+ sock_type(l4type), l4type);
if (sockfd < 0)
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));
+ rc = -ERRNO_TO_PARA_ERROR(rc);
+ break;
}
+ flowopt_setopts(sockfd, fo);
if (src) {
if (bind(sockfd, src->ai_addr, src->ai_addrlen) < 0) {
if (src && (src = src->ai_next)) /* restart inner loop */
dst = remote;
}
+out:
if (local)
freeaddrinfo(local);
if (remote)
freeaddrinfo(remote);
+ flowopt_cleanup(fo);
if (src == NULL && dst == NULL) {
- PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
+ if (rc >= 0)
+ rc = -E_MAKESOCK;
+ PARA_ERROR_LOG("can not create %s socket %s#%d.\n",
layer4_name(l4type), host? host : (passive?
- "[loopback]" : "[localhost]"), port);
- return -ERRNO_TO_PARA_ERROR(errno);
+ "[loopback]" : "[localhost]"), port_number);
+ return 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);
+ 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);
}
/**
- * Print numeric host and port number (beware - uses static char).
+ * Determine IPv4/v6 socket address length.
+ * \param sa Container of IPv4 or IPv6 address.
+ * \return Address-family dependent address length.
+ */
+static socklen_t salen(const struct sockaddr *sa)
+{
+ assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
+
+ return sa->sa_family == AF_INET6
+ ? sizeof(struct sockaddr_in6)
+ : sizeof(struct sockaddr_in);
+}
+
+/** True if @ss holds a v6-mapped-v4 address (RFC 4291, 2.5.5.2) */
+static bool SS_IS_ADDR_V4MAPPED(const struct sockaddr_storage *ss)
+{
+ const struct sockaddr_in6 *ia6 = (const struct sockaddr_in6 *)ss;
+
+ return ss->ss_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&ia6->sin6_addr);
+}
+
+/**
+ * Process IPv4/v6 address, turn v6-mapped-v4 address into normal IPv4 address.
+ * \param ss Container of IPv4/6 address.
+ * \return Pointer to normalized address (may be static storage).
*
- * \param sa The IPv4/IPv6 socket address to use.
- * \param len The length of \p sa.
+ * \sa RFC 3493
+ */
+static const struct sockaddr *
+normalize_ip_address(const struct sockaddr_storage *ss)
+{
+ assert(ss->ss_family == AF_INET || ss->ss_family == AF_INET6);
+
+ if (SS_IS_ADDR_V4MAPPED(ss)) {
+ const struct sockaddr_in6 *ia6 = (const struct sockaddr_in6 *)ss;
+ static struct sockaddr_in ia;
+
+ ia.sin_family = AF_INET;
+ ia.sin_port = ia6->sin6_port;
+ memcpy(&ia.sin_addr.s_addr, &(ia6->sin6_addr.s6_addr[12]), 4);
+ return (const struct sockaddr *)&ia;
+ }
+ return (const struct sockaddr *)ss;
+}
+
+/**
+ * Generic/fallback MTU values
+ *
+ * These are taken from RFC 1122, RFC 2460, and RFC 5405.
+ * - RFC 1122, 3.3.3 defines EMTU_S ("Effective MTU for sending") and recommends
+ * to use an EMTU_S size of of 576 bytes if the IPv4 path MTU is unknown;
+ * - RFC 2460, 5. requires a minimum IPv6 MTU of 1280 bytes;
+ * - RFC 5405, 3.2 recommends that if path MTU discovery is not done,
+ * UDP senders should use the respective minimum values of EMTU_S.
+ */
+static inline int generic_mtu(const int af_type)
+{
+ return af_type == AF_INET6 ? 1280 : 576;
+}
+
+/** Crude approximation of IP header overhead - neglecting options. */
+static inline int estimated_header_overhead(const int af_type)
+{
+ return af_type == AF_INET6 ? 40 : 20;
+}
+
+/**
+ * Get the maximum transport-layer message size (MMS_S).
*
- * \sa getnameinfo(3).
+ * \param sockfd The socket file descriptor.
+ *
+ * The socket must be connected. See RFC 1122, 3.3.3. If the protocol familiy
+ * could not be determined, \p AF_INET is assumed.
+ *
+ * \return The maximum message size of the address family type.
*/
-static char *host_and_port(struct sockaddr *sa, socklen_t len)
+int generic_max_transport_msg_size(int sockfd)
{
- static char output[NI_MAXHOST + NI_MAXSERV + 2];
- char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
- int ret;
+ struct sockaddr_storage ss;
+ socklen_t sslen = sizeof(ss);
+ int af_type = AF_INET;
- ret = getnameinfo(sa, len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
- NI_NUMERICHOST | NI_NUMERICSERV);
- if (ret) {
- PARA_WARNING_LOG("hostname lookup error (%s).\n",
- gai_strerror(ret));
- sprintf(output, "(unknown)");
- } else
- sprintf(output, "%s#%s", hbuf, sbuf);
- return output;
+ if (getpeername(sockfd, (struct sockaddr *)&ss, &sslen) < 0) {
+ PARA_ERROR_LOG("can not determine remote address type: %s\n",
+ strerror(errno));
+ } else if (!SS_IS_ADDR_V4MAPPED(&ss)) {
+ af_type = ss.ss_family;
+ }
+ return generic_mtu(af_type) - estimated_header_overhead(af_type);
}
/**
* remote side.
*
* \return A static character string identifying hostname and port of the
- * chosen side.
+ * chosen side in numeric host:port format.
*
- * \sa getsockname(2), getpeername(2).
+ * \sa getsockname(2), getpeername(2), parse_url(), getnameinfo(3),
+ * services(5), nsswitch.conf(5).
*/
-static char *__get_sock_name(int fd, int (*getname)(int, struct sockaddr*,
- socklen_t *))
+static char *__get_sock_name(int fd, typeof(getsockname) getname)
{
struct sockaddr_storage ss;
+ const struct sockaddr *sa;
socklen_t sslen = sizeof(ss);
+ char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
+ static char output[sizeof(hbuf) + sizeof(sbuf) + 4];
+ int ret;
if (getname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
- static char *dont_know = "(don't know)";
PARA_ERROR_LOG("can not determine address from fd %d: %s\n",
fd, strerror(errno));
- return dont_know;
+ snprintf(output, sizeof(output), "(unknown)");
+ return output;
}
- return host_and_port((struct sockaddr *)&ss, sslen);
+ sa = normalize_ip_address(&ss);
+ ret = getnameinfo(sa, salen(sa), hbuf, sizeof(hbuf), sbuf,
+ sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
+ if (ret) {
+ PARA_WARNING_LOG("hostname lookup error (%s).\n",
+ gai_strerror(ret));
+ snprintf(output, sizeof(output), "(lookup error)");
+ } else if (sa->sa_family == AF_INET6)
+ snprintf(output, sizeof(output), "[%s]:%s", hbuf, sbuf);
+ else
+ snprintf(output, sizeof(output), "%s:%s", hbuf, sbuf);
+ return output;
}
/**
/**
* Extract IPv4 or IPv6-mapped-IPv4 address from sockaddr_storage.
- * \param ss Container of IPv4/6 address
- * \return Extracted IPv4 address (different from 0) or 0 if unsuccessful.
- *
- * \sa RFC 3493
- */
-struct in_addr extract_v4_addr(const struct sockaddr_storage *ss)
-{
- struct in_addr ia = {.s_addr = 0};
-
- if (ss->ss_family == AF_INET)
- ia.s_addr = ((struct sockaddr_in *)ss)->sin_addr.s_addr;
- if (ss->ss_family == AF_INET6) {
- const struct in6_addr v6_addr = ((struct sockaddr_in6 *)ss)->sin6_addr;
-
- if (IN6_IS_ADDR_V4MAPPED(&v6_addr))
- memcpy(&ia.s_addr, &(v6_addr.s6_addr[12]), 4);
- }
- return ia;
-}
-
-/**
- * Send a binary buffer.
- *
- * \param fd The file descriptor.
- * \param buf The buffer to be sent.
- * \param len The length of \a buf.
*
- * Send out the buffer and try to resend the remaining part in case of short
- * writes.
+ * \param ss Container of IPv4/6 address.
+ * \param ia Extracted IPv4 address (different from 0) or 0 if unsuccessful.
*
- * \return Standard.
+ * \sa RFC 3493.
*/
-int send_bin_buffer(int fd, const char *buf, size_t len)
+void extract_v4_addr(const struct sockaddr_storage *ss, struct in_addr *ia)
{
- if (!len)
- PARA_CRIT_LOG("len == 0\n");
- return write_all(fd, buf, &len);
-}
+ const struct sockaddr *sa = normalize_ip_address(ss);
-/**
- * Send a \p NULL-terminated buffer.
- *
- * \param fd The file descriptor.
- * \param buf The null-terminated buffer to be send.
- *
- * This is equivalent to send_bin_buffer(fd, buf, strlen(buf)).
- *
- * \return Standard.
- */
-int send_buffer(int fd, const char *buf)
-{
- return send_bin_buffer(fd, buf, strlen(buf));
-}
-
-/**
- * Send a buffer given by a format string.
- *
- * \param fd The file descriptor.
- * \param fmt A format string.
- *
- * \return Standard.
- */
-__printf_2_3 int send_va_buffer(int fd, const char *fmt, ...)
-{
- char *msg;
- int ret;
-
- PARA_VSPRINTF(fmt, msg);
- ret = send_buffer(fd, msg);
- free(msg);
- return ret;
+ memset(ia, 0, sizeof(*ia));
+ if (sa->sa_family == AF_INET)
+ *ia = ((struct sockaddr_in *)sa)->sin_addr;
}
/**
* 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 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.
+ */
+int dccp_available_ccids(uint8_t **ccid_array)
+{
+ static uint8_t ccids[DCCP_MAX_HOST_CCIDS];
+ socklen_t nccids = sizeof(ccids);
+ int ret, fd;
+
+ ret = fd = makesock(IPPROTO_DCCP, 1, NULL, 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ if (getsockopt(fd, SOL_DCCP, DCCP_SOCKOPT_AVAILABLE_CCIDS,
+ ccids, &nccids) < 0) {
+ ret = errno;
+ close(fd);
+ PARA_ERROR_LOG("No DCCP_SOCKOPT_AVAILABLE_CCIDS: %s\n",
+ strerror(ret));
+ return -ERRNO_TO_PARA_ERROR(ret);
+ }
+
+ close(fd);
+ *ccid_array = ccids;
+ return nccids;
}
/**
* This function creates a local socket for sequenced, reliable, two-way,
* connection-based byte streams.
*
- * \return The file descriptor, on success, negative on errors.
+ * \return The file descriptor of the connected socket on success, negative on
+ * errors.
*
* \sa create_local_socket(), unix(7), connect(2).
*/
-int create_remote_socket(const char *name)
+int connect_local_socket(const char *name)
{
struct sockaddr_un unix_addr;
int fd, ret;
+ PARA_DEBUG_LOG("connecting to %s\n", name);
ret = init_unix_addr(&unix_addr, name);
if (ret < 0)
return ret;
#ifndef HAVE_UCRED
ssize_t send_cred_buffer(int sock, char *buf)
{
- return send_buffer(sock, buf);
+ return write_buffer(sock, buf);
}
int recv_cred_buffer(int fd, char *buf, size_t size)
{
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("n = %d, did not receive pattern '%s'\n", n,
- pattern);
- if (n > 0)
- PARA_NOTICE_LOG("recvd: %s\n", buf);
- }
- free(buf);
- return ret;
-}
projects / paraslash.git / blobdiff