/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2011 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"
* 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.
* \sa setsockopt(2)
*/
void flowopt_add(struct flowopts *fo, int lev, int opt,
- char *name, const void *val, int len)
+ const char *name, const void *val, int len)
{
struct pre_conn_opt *new = para_malloc(sizeof(*new));
}
void flowopt_add_bool(struct flowopts *fo, int lev, int opt,
- char *optname, bool on_or_off)
+ const char *optname, bool on_or_off)
{
int on = on_or_off; /* kernel takes 'int' */
/**
* 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.
const char *host, uint16_t port_number,
struct flowopts *fo)
{
- struct addrinfo *local = NULL, *src,
- *remote = NULL, *dst, hints;
+ 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);
layer4_name(l4type),
host? host : (passive? "[loopback]" : "[localhost]"),
port, gai_strerror(rc));
- return -E_ADDRESS_LOOKUP;
+ rc = -E_ADDRESS_LOOKUP;
+ goto out;
}
/* Iterate over all src/dst combination, exhausting dst first */
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));
- return -ERRNO_TO_PARA_ERROR(rc);
+ rc = -ERRNO_TO_PARA_ERROR(rc);
+ break;
}
flowopt_setopts(sockfd, fo);
if (src && (src = src->ai_next)) /* restart inner loop */
dst = remote;
}
+out:
if (local)
freeaddrinfo(local);
if (remote)
flowopt_cleanup(fo);
if (src == NULL && dst == NULL) {
- rc = errno;
+ 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 -ERRNO_TO_PARA_ERROR(rc);
+ return rc;
}
return sockfd;
}
: 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.
static const struct sockaddr *
normalize_ip_address(const struct sockaddr_storage *ss)
{
- const struct sockaddr_in6 *ia6 = (const struct sockaddr_in6 *)ss;
-
assert(ss->ss_family == AF_INET || ss->ss_family == AF_INET6);
- if (ss->ss_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&ia6->sin6_addr)) {
+ 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;
}
/**
- * Print numeric host and port number (beware - uses static char).
- *
- * \param sa The IPv4/IPv6 socket address to use.
- *
- * \sa getnameinfo(3), services(5), nsswitch.conf(5)
+ * 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 char *host_and_port(const struct sockaddr_storage *ss)
+static inline int generic_mtu(const int af_type)
{
- const struct sockaddr *sa = normalize_ip_address(ss);
- char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
- static char output[sizeof(hbuf) + sizeof(sbuf) + 2];
- int ret;
+ return af_type == AF_INET6 ? 1280 : 576;
+}
- ret = getnameinfo(sa, salen(sa),
- hbuf, sizeof(hbuf),
- sbuf, sizeof(sbuf),
- NI_NUMERICHOST);
- if (ret == 0) {
- snprintf(output, sizeof(output), "%s#%s", hbuf, sbuf);
- } else {
- snprintf(output, sizeof(output), "(unknown)");
- PARA_WARNING_LOG("hostname lookup error (%s).\n",
- gai_strerror(ret));
+/** 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;
+}
+
+/**
+ * Maximum transport-layer message size (MMS_S) as per RFC 1122, 3.3.3
+ * Socket must be connected.
+ */
+int generic_max_transport_msg_size(int sockfd)
+{
+ struct sockaddr_storage ss;
+ socklen_t sslen = sizeof(ss);
+ int af_type = AF_INET;
+
+ 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 output;
+ 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 *))
{
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(&ss);
+ 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;
}
/**
* 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(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;
}
/**
* 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;
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;
-}
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