mirror of
https://github.com/rkd77/elinks.git
synced 2024-09-06 23:44:43 -04:00
1112 lines
26 KiB
C
1112 lines
26 KiB
C
/* Sockets-o-matic */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h> /* OS/2 needs this after sys/types.h */
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h> /* OS/2 needs this after sys/types.h */
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h> /* OS/2 needs this after sys/types.h */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_WS2TCPIP_H
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#include <ws2tcpip.h> /* socklen_t for MinGW */
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#endif
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#ifdef HAVE_GETIFADDRS
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#ifdef HAVE_IFADDRS_H
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#include <ifaddrs.h> /* getifaddrs() */
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#endif
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#endif /* HAVE_GETIFADDRS */
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include "elinks.h"
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#include "config/options.h"
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#include "main/select.h"
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#include "network/connection.h"
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#include "network/dns.h"
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#include "network/socket.h"
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#include "network/ssl/socket.h"
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#include "osdep/osdep.h"
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#include "osdep/getifaddrs.h"
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#include "protocol/http/blacklist.h"
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#include "protocol/protocol.h"
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#include "protocol/uri.h"
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#include "util/error.h"
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#include "util/memory.h"
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#include "util/string.h"
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/* Holds information used during the connection establishing phase. */
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struct connect_info {
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struct sockaddr_storage *addr; /* Array of found addresses. */
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int addrno; /* Number of found addresses. */
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int triedno; /* Index of last tried address */
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socket_connect_T done; /* Callback signaled when connected. */
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void *dnsquery; /* Pointer to DNS query info. */
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int port; /* Which port to bind to. */
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int ip_family; /* If non-zero, force to IP version. */
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struct uri *uri; /* For updating the blacklist. */
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};
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/** For detecting whether a struct socket has been deleted while a
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* function was using it. */
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struct socket_weak_ref {
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LIST_HEAD(struct socket_weak_ref);
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/** done_socket() resets this to NULL. */
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struct socket *socket;
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};
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static INIT_LIST_OF(struct socket_weak_ref, socket_weak_refs);
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/* To enable logging of tranfers, for debugging purposes. */
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#if 0
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#define DEBUG_TRANSFER_LOGFILE "/tmp/log"
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static void
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debug_transfer_log(char *data, int len)
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{
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int fd = open(DEBUG_TRANSFER_LOGFILE, O_WRONLY | O_APPEND | O_CREAT, 0622);
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if (fd == -1) return;
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set_bin(fd);
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write(fd, data, len < 0 ? strlen(data) : len);
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close(fd);
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}
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#undef DEBUG_TRANSFER_LOGFILE
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#else
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#define debug_transfer_log(data, len)
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#endif
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static struct connect_info *
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init_connection_info(struct uri *uri, struct socket *socket,
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socket_connect_T connect_done)
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{
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struct connect_info *connect_info = (struct connect_info *)mem_calloc(1, sizeof(*connect_info));
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if (!connect_info) return NULL;
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connect_info->done = connect_done;
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connect_info->port = get_uri_port(uri);
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connect_info->ip_family = uri->ip_family;
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connect_info->triedno = -1;
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connect_info->addr = NULL;
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connect_info->uri = get_uri_reference(uri);
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return connect_info;
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}
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static void
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done_connection_info(struct socket *socket)
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{
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struct connect_info *connect_info = socket->connect_info;
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assert(socket->connect_info);
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if (connect_info->dnsquery) kill_dns_request(&connect_info->dnsquery);
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mem_free_if(connect_info->addr);
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done_uri(connect_info->uri);
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mem_free_set(&socket->connect_info, NULL);
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}
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struct socket *
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init_socket(void *conn, struct socket_operations *ops)
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{
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struct socket *socket;
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socket = (struct socket *)mem_calloc(1, sizeof(*socket));
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if (!socket) return NULL;
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socket->fd = -1;
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socket->conn = conn;
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socket->ops = ops;
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return socket;
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}
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void
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done_socket(struct socket *socket)
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{
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struct socket_weak_ref *ref;
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close_socket(socket);
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if (socket->connect_info)
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done_connection_info(socket);
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mem_free_set(&socket->read_buffer, NULL);
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mem_free_set(&socket->write_buffer, NULL);
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foreach(ref, socket_weak_refs) {
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if (ref->socket == socket)
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ref->socket = NULL;
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}
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}
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void
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close_socket(struct socket *socket)
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{
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if (socket->fd == -1) return;
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#ifdef CONFIG_SSL
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if (socket->ssl) ssl_close(socket);
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#endif
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close(socket->fd);
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clear_handlers(socket->fd);
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socket->fd = -1;
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}
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void
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dns_exception(struct socket *socket)
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{
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connect_socket(socket, connection_state(S_EXCEPT));
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}
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static void
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exception(struct socket *socket)
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{
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socket->ops->retry(socket, connection_state(S_EXCEPT));
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}
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void
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timeout_socket(struct socket *socket)
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{
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if (!socket->connect_info) {
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socket->ops->retry(socket, connection_state(S_TIMEOUT));
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return;
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}
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/* Is the DNS resolving still in progress? */
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if (socket->connect_info->dnsquery) {
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socket->ops->done(socket, connection_state(S_TIMEOUT));
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return;
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}
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/* Try the next address, */
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connect_socket(socket, connection_state(S_TIMEOUT));
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/* Reset the timeout if connect_socket() started a new attempt
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* to connect. */
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if (socket->connect_info)
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socket->ops->set_timeout(socket, connection_state(0));
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}
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/* DNS callback. */
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static void
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dns_found(struct socket *socket, struct sockaddr_storage *addr, int addrlen)
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{
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struct connect_info *connect_info = socket->connect_info;
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int size;
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if (!addr) {
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socket->ops->done(socket, connection_state(S_NO_DNS));
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return;
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}
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assert(connect_info);
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size = sizeof(*addr) * addrlen;
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connect_info->addr = (struct sockaddr_storage *)mem_alloc(size);
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if (!connect_info->addr) {
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socket->ops->done(socket, connection_state(S_OUT_OF_MEM));
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return;
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}
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memcpy(connect_info->addr, addr, size);
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connect_info->addrno = addrlen;
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/* XXX: Passing non-result state here is bad but a lack of alternatives
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* makes it so. Well adding get_state() socket operation could maybe fix
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* it but the returned state would most likely be a non-result one at
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* this point in the connection lifecycle. This will, however, only be a
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* problem if connect_socket() fails without doing any system calls
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* which is only the case when forcing the IP family. So it is better to
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* handle it in connect_socket(). */
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connect_socket(socket, connection_state(S_CONN));
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}
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void
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make_connection(struct socket *socket, struct uri *uri,
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socket_connect_T connect_done, int no_cache)
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{
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char *host = get_uri_string(uri, URI_DNS_HOST);
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struct connect_info *connect_info;
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enum dns_result result;
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blacklist_flags_T verify;
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socket->ops->set_timeout(socket, connection_state(0));
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if (!host) {
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socket->ops->retry(socket, connection_state(S_OUT_OF_MEM));
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return;
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}
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connect_info = init_connection_info(uri, socket, connect_done);
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if (!connect_info) {
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mem_free(host);
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socket->ops->retry(socket, connection_state(S_OUT_OF_MEM));
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return;
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}
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socket->connect_info = connect_info;
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/* XXX: Keep here and not in init_connection_info() to make
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* complete_connect_socket() work from the HTTP implementation. */
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socket->need_ssl = get_protocol_need_ssl(uri->protocol);
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if (!socket->set_no_tls) {
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blacklist_flags_T flags = get_blacklist_flags(uri);
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socket->no_tls = ((flags & SERVER_BLACKLIST_NO_TLS) != 0);
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socket->set_no_tls = 1;
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}
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verify = get_blacklist_flags(uri);
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socket->verify = ((verify & SERVER_BLACKLIST_NO_CERT_VERIFY) == 0);
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debug_transfer_log("\nCONNECTION: ", -1);
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debug_transfer_log(host, -1);
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debug_transfer_log("\n", -1);
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result = find_host(host, &connect_info->dnsquery, (dns_callback_T) dns_found,
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socket, no_cache);
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mem_free(host);
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if (result == DNS_ASYNC)
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socket->ops->set_state(socket, connection_state(S_DNS));
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}
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/* Returns negative if error, otherwise pasv socket's fd. */
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int
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get_pasv_socket(struct socket *ctrl_socket, struct sockaddr_storage *addr)
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{
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struct sockaddr_in bind_addr4;
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struct sockaddr *bind_addr;
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struct sockaddr *pasv_addr = (struct sockaddr *) addr;
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size_t addrlen;
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int sock = -1;
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int syspf; /* Protocol Family given to system, not EL_PF_... */
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socklen_t len;
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#ifdef CONFIG_IPV6
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struct sockaddr_in6 bind_addr6;
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if (ctrl_socket->protocol_family == EL_PF_INET6) {
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bind_addr = (struct sockaddr *) &bind_addr6;
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addrlen = sizeof(bind_addr6);
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syspf = PF_INET6;
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} else
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#endif
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{
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bind_addr = (struct sockaddr *) &bind_addr4;
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addrlen = sizeof(bind_addr4);
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syspf = PF_INET;
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}
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memset(pasv_addr, 0, addrlen);
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memset(bind_addr, 0, addrlen);
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/* Get our endpoint of the control socket */
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len = addrlen;
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if (getsockname(ctrl_socket->fd, pasv_addr, &len)) {
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sock_error:
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if (sock != -1) close(sock);
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ctrl_socket->ops->retry(ctrl_socket,
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connection_state_for_errno(errno));
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return -1;
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}
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/* Get a passive socket */
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sock = socket(syspf, SOCK_STREAM, IPPROTO_TCP);
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if (sock < 0)
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goto sock_error;
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/* Set it non-blocking */
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if (set_nonblocking_fd(sock) < 0)
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goto sock_error;
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/* Bind it to some port */
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memcpy(bind_addr, pasv_addr, addrlen);
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#ifdef CONFIG_IPV6
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if (ctrl_socket->protocol_family == EL_PF_INET6)
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bind_addr6.sin6_port = 0;
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else
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#endif
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bind_addr4.sin_port = 0;
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if (bind(sock, bind_addr, addrlen))
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goto sock_error;
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/* Get our endpoint of the passive socket and save it to port */
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len = addrlen;
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if (getsockname(sock, pasv_addr, &len))
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goto sock_error;
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/* Go listen */
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if (listen(sock, 1))
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goto sock_error;
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set_ip_tos_throughput(sock);
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return sock;
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}
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#ifdef CONFIG_IPV6
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static inline int
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check_if_local_address6(struct sockaddr_in6 *addr)
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{
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struct ifaddrs *ifaddrs;
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int local = IN6_IS_ADDR_LOOPBACK(&(addr->sin6_addr));
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if (!local && !getifaddrs(&ifaddrs)) {
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struct ifaddrs *ifa;
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for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
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if (!ifa->ifa_addr)
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continue;
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if (ifa->ifa_addr->sa_family == AF_INET6
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&& !memcmp(&addr->sin6_addr.s6_addr,
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&((struct sockaddr_in6 *) ifa->ifa_addr)->sin6_addr.s6_addr,
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sizeof(addr->sin6_addr.s6_addr))) {
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local = 1;
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break;
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}
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if (ifa->ifa_addr->sa_family == AF_INET
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&& !memcmp(&((struct sockaddr_in *) &addr)->sin_addr.s_addr,
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&((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr,
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sizeof(((struct sockaddr_in *) &addr)->sin_addr.s_addr))) {
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local = 1;
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break;
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}
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}
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freeifaddrs(ifaddrs);
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}
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return local;
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}
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#endif /* CONFIG_IPV6 */
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static inline int
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check_if_local_address4(struct sockaddr_in *addr)
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{
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struct ifaddrs *ifaddrs;
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int local = (ntohl(addr->sin_addr.s_addr) >> 24) == IN_LOOPBACKNET;
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if (!local && !getifaddrs(&ifaddrs)) {
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struct ifaddrs *ifa;
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for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
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if (!ifa->ifa_addr)
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continue;
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if (ifa->ifa_addr->sa_family != AF_INET) continue;
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if (!memcmp(&addr->sin_addr.s_addr,
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&((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr,
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sizeof(addr->sin_addr.s_addr))) {
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local = 1;
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break;
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}
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}
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freeifaddrs(ifaddrs);
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}
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return local;
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}
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void
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complete_connect_socket(struct socket *socket, struct uri *uri,
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socket_connect_T done)
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{
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struct connect_info *connect_info = socket->connect_info;
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if (connect_info && connect_info->uri) {
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/* Remember whether the server supported TLS or not.
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* Then the next request can immediately use the right
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* protocol. This is important for HTTP POST requests
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* because it is not safe to silently retry them. The
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* uri parameter is normally NULL here so don't use it. */
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if (socket->no_tls)
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add_blacklist_entry(connect_info->uri,
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SERVER_BLACKLIST_NO_TLS);
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else
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del_blacklist_entry(connect_info->uri,
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SERVER_BLACKLIST_NO_TLS);
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}
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/* This is a special case used by the HTTP implementation to acquire an
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* SSL link for handling CONNECT requests. */
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if (!connect_info) {
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assert(uri && socket);
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connect_info = init_connection_info(uri, socket, done);
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if (!connect_info) {
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socket->ops->done(socket, connection_state(S_OUT_OF_MEM));
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return;
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}
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socket->connect_info = connect_info;
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}
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#ifdef CONFIG_SSL
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/* Check if the connection should run over an encrypted link */
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if (socket->need_ssl
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&& !socket->ssl
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&& ssl_connect(socket) < 0)
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return;
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#endif
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if (connect_info->done)
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connect_info->done(socket);
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done_connection_info(socket);
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}
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/* Select handler which is set for the socket descriptor when connect() has
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* indicated (via errno) that it is in progress. On completion this handler gets
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* called. */
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static void
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connected(struct socket *socket)
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{
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int err = 0;
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struct connection_state state = connection_state(0);
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socklen_t len = sizeof(err);
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assertm(socket->connect_info != NULL, "Lost connect_info!");
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if_assert_failed return;
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if (getsockopt(socket->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len) == 0) {
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/* Why does EMX return so large values? */
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if (err >= 10000) err -= 10000;
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if (err != 0)
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state = connection_state_for_errno(err);
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else
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state = connection_state(0);
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} else {
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/* getsockopt() failed */
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if (errno != 0)
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state = connection_state_for_errno(errno);
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else
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state = connection_state(S_STATE);
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}
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if (!is_in_state(state, 0)) {
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/* There are maybe still some more candidates. */
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connect_socket(socket, state);
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return;
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}
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complete_connect_socket(socket, NULL, NULL);
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}
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|
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static int to_bind;
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static struct sockaddr_in sa_bind;
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|
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#ifdef CONFIG_IPV6
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static int to_bind_ipv6;
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static struct sockaddr_in6 sa6_bind;
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#endif
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|
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static void
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init_bind_address(void)
|
|
{
|
|
char *bind_address = get_cmd_opt_str("bind-address");
|
|
#ifdef CONFIG_IPV6
|
|
char *bind_address_ipv6 = get_cmd_opt_str("bind-address-ipv6");
|
|
#endif
|
|
|
|
#ifdef HAVE_INET_PTON
|
|
to_bind = (bind_address && *bind_address);
|
|
|
|
if (to_bind) {
|
|
memset(&sa_bind, 0, sizeof sa_bind);
|
|
sa_bind.sin_family = AF_INET;
|
|
inet_pton(AF_INET, bind_address, &(sa_bind.sin_addr));
|
|
sa_bind.sin_port = htons(0);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6
|
|
to_bind_ipv6 = (bind_address_ipv6 && *bind_address_ipv6);
|
|
|
|
if (to_bind_ipv6) {
|
|
memset(&sa6_bind, 0, sizeof sa6_bind);
|
|
sa6_bind.sin6_family = AF_INET6;
|
|
inet_pton(AF_INET6, bind_address_ipv6, &(sa6_bind.sin6_addr));
|
|
sa6_bind.sin6_port = htons(0);
|
|
}
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
void
|
|
connect_socket(struct socket *csocket, struct connection_state state)
|
|
{
|
|
static int initialized;
|
|
int sock = -1;
|
|
struct connect_info *connect_info = csocket->connect_info;
|
|
int i;
|
|
int trno = connect_info->triedno;
|
|
int only_local = get_cmd_opt_bool("localhost");
|
|
int saved_errno = 0;
|
|
int at_least_one_remote_ip = 0;
|
|
#ifdef CONFIG_IPV6
|
|
int try_ipv6 = get_opt_bool("connection.try_ipv6", NULL);
|
|
#endif
|
|
int try_ipv4 = get_opt_bool("connection.try_ipv4", NULL);
|
|
/* We tried something but we failed in such a way that we would rather
|
|
* prefer the connection to retain the information about previous
|
|
* failures. That is, we i.e. decided we are forbidden to even think
|
|
* about such a connection attempt.
|
|
* XXX: Unify with @local_only handling? --pasky */
|
|
int silent_fail = 0;
|
|
|
|
if (!initialized) {
|
|
init_bind_address();
|
|
initialized = 1;
|
|
}
|
|
|
|
csocket->ops->set_state(csocket, state);
|
|
|
|
/* Clear handlers, the connection to the previous RR really timed
|
|
* out and doesn't interest us anymore. */
|
|
if (csocket->fd >= 0)
|
|
close_socket(csocket);
|
|
|
|
for (i = connect_info->triedno + 1; i < connect_info->addrno; i++) {
|
|
#ifdef CONFIG_IPV6
|
|
struct sockaddr_in6 addr = *((struct sockaddr_in6 *) &connect_info->addr[i]);
|
|
int family = addr.sin6_family;
|
|
#else
|
|
struct sockaddr_in addr = *((struct sockaddr_in *) &connect_info->addr[i]);
|
|
int family = addr.sin_family;
|
|
#endif
|
|
int pf;
|
|
int force_family = connect_info->ip_family;
|
|
|
|
connect_info->triedno++;
|
|
|
|
if (only_local) {
|
|
int local = 0;
|
|
#ifdef CONFIG_IPV6
|
|
if (family == AF_INET6)
|
|
local = check_if_local_address6((struct sockaddr_in6 *) &addr);
|
|
else
|
|
#endif
|
|
local = check_if_local_address4((struct sockaddr_in *) &addr);
|
|
|
|
/* This forbids connections to anything but local, if option is set. */
|
|
if (!local) {
|
|
at_least_one_remote_ip = 1;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6
|
|
if (family == AF_INET6) {
|
|
if (!try_ipv6 || (force_family && force_family != 6)) {
|
|
silent_fail = 1;
|
|
continue;
|
|
}
|
|
pf = PF_INET6;
|
|
|
|
} else
|
|
#endif
|
|
if (family == AF_INET) {
|
|
if (!try_ipv4 || (force_family && force_family != 4)) {
|
|
silent_fail = 1;
|
|
continue;
|
|
}
|
|
pf = PF_INET;
|
|
|
|
} else {
|
|
continue;
|
|
}
|
|
silent_fail = 0;
|
|
|
|
sock = socket(pf, SOCK_STREAM, IPPROTO_TCP);
|
|
if (sock == -1) {
|
|
if (errno && !saved_errno) saved_errno = errno;
|
|
continue;
|
|
}
|
|
|
|
if (set_nonblocking_fd(sock) < 0) {
|
|
if (errno && !saved_errno) saved_errno = errno;
|
|
close(sock);
|
|
continue;
|
|
}
|
|
|
|
#ifdef HAVE_INET_PTON
|
|
if (pf == PF_INET && to_bind) {
|
|
struct sockaddr_in sa;
|
|
int res;
|
|
|
|
memcpy(&sa, &sa_bind, sizeof sa);
|
|
res = bind(sock, (struct sockaddr *)(void *)&sa, sizeof sa);
|
|
|
|
if (res < 0) {
|
|
if (errno && !saved_errno) saved_errno = errno;
|
|
close(sock);
|
|
continue;
|
|
}
|
|
}
|
|
#ifdef CONFIG_IPV6
|
|
if (pf == PF_INET6 && to_bind_ipv6) {
|
|
struct sockaddr_in6 sa;
|
|
int res;
|
|
|
|
memcpy(&sa, &sa6_bind, sizeof sa);
|
|
res = bind(sock, (struct sockaddr *)(void *)&sa, sizeof sa);
|
|
|
|
if (res < 0) {
|
|
if (errno && !saved_errno) saved_errno = errno;
|
|
close(sock);
|
|
continue;
|
|
}
|
|
}
|
|
#endif
|
|
#endif
|
|
csocket->fd = sock;
|
|
|
|
#ifdef CONFIG_IPV6
|
|
addr.sin6_port = htons(connect_info->port);
|
|
#else
|
|
addr.sin_port = htons(connect_info->port);
|
|
#endif
|
|
|
|
/* We can set csocket->protocol_family here even if the connection
|
|
* will fail, as we will use it only when it will be successfully
|
|
* established. At least I hope that noone else will want to do
|
|
* something else ;-). --pasky */
|
|
/* And in fact we must set it early, because of EINPROGRESS. */
|
|
|
|
#ifdef CONFIG_IPV6
|
|
if (family == AF_INET6) {
|
|
csocket->protocol_family = EL_PF_INET6;
|
|
if (connect(sock, (struct sockaddr *) &addr,
|
|
sizeof(struct sockaddr_in6)) == 0) {
|
|
/* Success */
|
|
complete_connect_socket(csocket, NULL, NULL);
|
|
return;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
csocket->protocol_family = EL_PF_INET;
|
|
if (connect(sock, (struct sockaddr *) &addr,
|
|
sizeof(struct sockaddr_in)) == 0) {
|
|
/* Success */
|
|
complete_connect_socket(csocket, NULL, NULL);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (errno == EALREADY
|
|
#ifdef EWOULDBLOCK
|
|
|| errno == EWOULDBLOCK
|
|
#endif
|
|
|| errno == EINPROGRESS) {
|
|
/* It will take some more time... */
|
|
set_handlers(sock, NULL, (select_handler_T) connected,
|
|
(select_handler_T) dns_exception, csocket);
|
|
csocket->ops->set_state(csocket, connection_state(S_CONN));
|
|
return;
|
|
}
|
|
|
|
if (errno && !saved_errno) saved_errno = errno;
|
|
|
|
close(sock);
|
|
}
|
|
|
|
assert(i >= connect_info->addrno);
|
|
|
|
/* Tried everything, but it didn't help :(. */
|
|
|
|
if (only_local && !saved_errno && at_least_one_remote_ip) {
|
|
/* Yes we might hit a local address and fail in the process, but
|
|
* what matters is the last one because we do not know the
|
|
* previous one's errno, and the added complexity wouldn't
|
|
* really be worth it. */
|
|
csocket->ops->done(csocket, connection_state(S_LOCAL_ONLY));
|
|
return;
|
|
}
|
|
|
|
/* Retry reporting the errno state only if we already tried something
|
|
* new. Else use the S_DNS _progress_ state to make sure that no
|
|
* download callbacks will report any errors. */
|
|
if (trno != connect_info->triedno && !silent_fail)
|
|
state = connection_state_for_errno(errno);
|
|
else if (trno == -1 && silent_fail)
|
|
/* All failed. */
|
|
state = connection_state(S_NO_FORCED_DNS);
|
|
|
|
csocket->ops->retry(csocket, state);
|
|
}
|
|
|
|
|
|
struct write_buffer {
|
|
/* A routine called when all the data is sent (therefore this is
|
|
* _different_ from read_buffer.done !). */
|
|
socket_write_T done;
|
|
|
|
int length;
|
|
int pos;
|
|
|
|
char data[1]; /* must be at end of struct */
|
|
};
|
|
|
|
static int
|
|
generic_write(struct socket *socket, char *data, int len)
|
|
{
|
|
int wr = safe_write(socket->fd, data, len);
|
|
|
|
if (!wr) return SOCKET_CANT_WRITE;
|
|
|
|
if (wr < 0) {
|
|
#ifdef EWOULDBLOCK
|
|
if (errno == EWOULDBLOCK) return SOCKET_CANT_WRITE;
|
|
#endif
|
|
return SOCKET_SYSCALL_ERROR;
|
|
}
|
|
return wr;
|
|
}
|
|
|
|
static void
|
|
write_select(struct socket *socket)
|
|
{
|
|
struct write_buffer *wb = (struct write_buffer *)socket->write_buffer;
|
|
int wr;
|
|
|
|
assertm(wb != NULL, "write socket has no buffer");
|
|
if_assert_failed {
|
|
socket->ops->done(socket, connection_state(S_INTERNAL));
|
|
return;
|
|
}
|
|
|
|
/* We are making some progress, therefore reset the timeout; ie. when
|
|
* uploading large files the time needed for all the data to be sent can
|
|
* easily exceed the timeout. */
|
|
socket->ops->set_timeout(socket, connection_state(0));
|
|
|
|
#if 0
|
|
printf("ws: %d\n",wb->length-wb->pos);
|
|
for (wr = wb->pos; wr < wb->length; wr++) printf("%c", wb->data[wr]);
|
|
printf("-\n");
|
|
#endif
|
|
|
|
#ifdef CONFIG_SSL
|
|
if (socket->ssl) {
|
|
wr = ssl_write(socket, wb->data + wb->pos, wb->length - wb->pos);
|
|
} else
|
|
#endif
|
|
{
|
|
assert(wb->length - wb->pos > 0);
|
|
wr = generic_write(socket, wb->data + wb->pos, wb->length - wb->pos);
|
|
}
|
|
|
|
switch (wr) {
|
|
case SOCKET_CANT_WRITE:
|
|
socket->ops->retry(socket, connection_state(S_CANT_WRITE));
|
|
break;
|
|
|
|
case SOCKET_SYSCALL_ERROR:
|
|
socket->ops->retry(socket, connection_state_for_errno(errno));
|
|
break;
|
|
|
|
case SOCKET_INTERNAL_ERROR:
|
|
/* The global errno variable is used for passing
|
|
* internal connection_state error value. */
|
|
socket->ops->done(socket, connection_state(errno));
|
|
break;
|
|
|
|
default:
|
|
if (wr < 0) break;
|
|
|
|
/*printf("wr: %d\n", wr);*/
|
|
wb->pos += wr;
|
|
|
|
if (wb->pos == wb->length) {
|
|
socket_write_T done = wb->done;
|
|
|
|
if (!socket->duplex) {
|
|
clear_handlers(socket->fd);
|
|
|
|
} else {
|
|
select_handler_T read_handler;
|
|
select_handler_T error_handler;
|
|
|
|
read_handler = get_handler(socket->fd, SELECT_HANDLER_READ);
|
|
error_handler = read_handler
|
|
? (select_handler_T) exception
|
|
: NULL;
|
|
|
|
set_handlers(socket->fd, read_handler, NULL,
|
|
error_handler, socket);
|
|
}
|
|
|
|
mem_free_set(&socket->write_buffer, NULL);
|
|
done(socket);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
write_to_socket(struct socket *socket, char *data, int len,
|
|
struct connection_state state, socket_write_T write_done)
|
|
{
|
|
select_handler_T read_handler;
|
|
struct write_buffer *wb;
|
|
|
|
debug_transfer_log(data, len);
|
|
|
|
assert(len > 0);
|
|
if_assert_failed return;
|
|
|
|
socket->ops->set_timeout(socket, connection_state(0));
|
|
|
|
wb = (struct write_buffer *)mem_alloc(sizeof(*wb) + len);
|
|
if (!wb) {
|
|
socket->ops->done(socket, connection_state(S_OUT_OF_MEM));
|
|
return;
|
|
}
|
|
|
|
wb->length = len;
|
|
wb->pos = 0;
|
|
wb->done = write_done;
|
|
memcpy(wb->data, data, len);
|
|
mem_free_set(&socket->write_buffer, wb);
|
|
|
|
if (socket->duplex) {
|
|
read_handler = get_handler(socket->fd, SELECT_HANDLER_READ);
|
|
} else {
|
|
read_handler = NULL;
|
|
}
|
|
|
|
set_handlers(socket->fd, read_handler, (select_handler_T) write_select,
|
|
(select_handler_T) exception, socket);
|
|
socket->ops->set_state(socket, state);
|
|
}
|
|
|
|
#define RD_ALLOC_GR (2<<11) /* 4096 */
|
|
#define RD_MEM(rb) (sizeof(*(rb)) + 4 * RD_ALLOC_GR + RD_ALLOC_GR)
|
|
#define RD_SIZE(rb, len) ((RD_MEM(rb) + (len)) & ~(RD_ALLOC_GR - 1))
|
|
|
|
static ssize_t
|
|
generic_read(struct socket *socket, char *data, int len)
|
|
{
|
|
ssize_t rd = safe_read(socket->fd, data, len);
|
|
|
|
if (!rd) return SOCKET_CANT_READ;
|
|
|
|
if (rd < 0) {
|
|
#ifdef EWOULDBLOCK
|
|
if (errno == EWOULDBLOCK) return SOCKET_CANT_READ;
|
|
#endif
|
|
return SOCKET_SYSCALL_ERROR;
|
|
}
|
|
return rd;
|
|
}
|
|
|
|
static void
|
|
read_select(struct socket *socket)
|
|
{
|
|
struct read_buffer *rb = socket->read_buffer;
|
|
ssize_t rd;
|
|
|
|
assertm(rb != NULL, "read socket has no buffer");
|
|
if_assert_failed {
|
|
socket->ops->done(socket, connection_state(S_INTERNAL));
|
|
return;
|
|
}
|
|
|
|
/* We are making some progress, therefore reset the timeout; we do this
|
|
* for read_select() to avoid that the periodic calls to user handlers
|
|
* has to do it. */
|
|
socket->ops->set_timeout(socket, connection_state(0));
|
|
|
|
if (!socket->duplex)
|
|
clear_handlers(socket->fd);
|
|
|
|
if (!rb->freespace) {
|
|
int size = RD_SIZE(rb, rb->length);
|
|
|
|
rb = (struct read_buffer *)mem_realloc(rb, size);
|
|
if (!rb) {
|
|
socket->ops->done(socket, connection_state(S_OUT_OF_MEM));
|
|
return;
|
|
}
|
|
rb->freespace = size - sizeof(*rb) - rb->length;
|
|
assert(rb->freespace > 0);
|
|
socket->read_buffer = rb;
|
|
}
|
|
|
|
#ifdef CONFIG_SSL
|
|
if (socket->ssl) {
|
|
rd = ssl_read(socket, rb->data + rb->length, rb->freespace);
|
|
} else
|
|
#endif
|
|
{
|
|
rd = generic_read(socket, rb->data + rb->length, rb->freespace);
|
|
}
|
|
|
|
switch (rd) {
|
|
#ifdef CONFIG_SSL
|
|
case SOCKET_SSL_WANT_READ:
|
|
read_from_socket(socket, rb, connection_state(S_TRANS), rb->done);
|
|
break;
|
|
#endif
|
|
case SOCKET_CANT_READ:
|
|
if (socket->state != SOCKET_RETRY_ONCLOSE) {
|
|
socket->state = SOCKET_CLOSED;
|
|
rb->done(socket, rb);
|
|
break;
|
|
}
|
|
|
|
socket->ops->retry(socket, connection_state(S_CANT_READ));
|
|
break;
|
|
|
|
case SOCKET_SYSCALL_ERROR:
|
|
socket->ops->retry(socket, connection_state_for_errno(errno));
|
|
break;
|
|
|
|
case SOCKET_INTERNAL_ERROR:
|
|
/* The global errno variable is used for passing
|
|
* internal connection_state error value. */
|
|
socket->ops->done(socket, connection_state(errno));
|
|
break;
|
|
|
|
default:
|
|
debug_transfer_log(rb->data + rb->length, rd);
|
|
|
|
rb->length += rd;
|
|
rb->freespace -= rd;
|
|
assert(rb->freespace >= 0);
|
|
|
|
rb->done(socket, rb);
|
|
}
|
|
}
|
|
|
|
struct read_buffer *
|
|
alloc_read_buffer(struct socket *socket)
|
|
{
|
|
struct read_buffer *rb;
|
|
|
|
rb = (struct read_buffer *)mem_calloc(1, RD_SIZE(rb, 0));
|
|
if (!rb) {
|
|
socket->ops->done(socket, connection_state(S_OUT_OF_MEM));
|
|
return NULL;
|
|
}
|
|
|
|
rb->freespace = RD_SIZE(rb, 0) - sizeof(*rb);
|
|
|
|
return rb;
|
|
}
|
|
|
|
#undef RD_ALLOC_GR
|
|
#undef RD_MEM
|
|
#undef RD_SIZE
|
|
|
|
void
|
|
read_from_socket(struct socket *socket, struct read_buffer *buffer,
|
|
struct connection_state state, socket_read_T done)
|
|
{
|
|
const int is_buffer_new = (buffer != socket->read_buffer);
|
|
struct socket_weak_ref ref;
|
|
select_handler_T write_handler;
|
|
|
|
ref.socket = socket;
|
|
add_to_list(socket_weak_refs, &ref);
|
|
|
|
buffer->done = done;
|
|
|
|
socket->ops->set_timeout(socket, connection_state(0));
|
|
socket->ops->set_state(socket, state);
|
|
|
|
del_from_list(&ref);
|
|
if (ref.socket == NULL) {
|
|
/* socket->ops->set_state deleted the socket. */
|
|
if (is_buffer_new)
|
|
mem_free(buffer);
|
|
return;
|
|
}
|
|
|
|
if (socket->read_buffer && buffer != socket->read_buffer)
|
|
mem_free(socket->read_buffer);
|
|
socket->read_buffer = buffer;
|
|
|
|
if (socket->duplex) {
|
|
write_handler = get_handler(socket->fd, SELECT_HANDLER_WRITE);
|
|
} else {
|
|
write_handler = NULL;
|
|
}
|
|
|
|
set_handlers(socket->fd, (select_handler_T) read_select, write_handler,
|
|
(select_handler_T) exception, socket);
|
|
}
|
|
|
|
static void
|
|
read_response_from_socket(struct socket *socket)
|
|
{
|
|
struct read_buffer *rb = alloc_read_buffer(socket);
|
|
|
|
if (rb) read_from_socket(socket, rb, connection_state(S_SENT),
|
|
socket->read_done);
|
|
}
|
|
|
|
void
|
|
request_from_socket(struct socket *socket, char *data, int datalen,
|
|
struct connection_state state, enum socket_state sock_state,
|
|
socket_read_T read_done)
|
|
{
|
|
socket->read_done = read_done;
|
|
socket->state = sock_state;
|
|
write_to_socket(socket, data, datalen, state,
|
|
read_response_from_socket);
|
|
}
|
|
|
|
void
|
|
kill_buffer_data(struct read_buffer *rb, int n)
|
|
{
|
|
assertm(n >= 0 && n <= rb->length, "bad number of bytes: %d", n);
|
|
if_assert_failed { rb->length = 0; return; }
|
|
|
|
if (!n) return; /* FIXME: We accept to kill 0 bytes... */
|
|
rb->length -= n;
|
|
memmove(rb->data, rb->data + n, rb->length);
|
|
rb->freespace += n;
|
|
}
|