Sylpheed

/*

 * LibSylph -- E-Mail client library

 * Copyright (C) 1999-2005 Hiroyuki Yamamoto

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif

#include <glib.h>

#include <sys/time.h>

#include <sys/types.h>

#ifdef G_OS_WIN32

#  include <winsock2.h>

#else

#  if HAVE_SYS_WAIT_H

#    include <sys/wait.h>

#  endif

#  include <sys/socket.h>

#  include <sys/un.h>

#  include <netinet/in.h>

#  include <arpa/inet.h>

#  include <netdb.h>

#endif /* G_OS_WIN32 */

#include <unistd.h>

#include <stdio.h>

#include <string.h>

#include <stdarg.h>

#include <fcntl.h>

#include <errno.h>

#include <signal.h>

#include <setjmp.h>

#if HAVE_SYS_SELECT_H

#  include <sys/select.h>

#endif

#include "socket.h"

#if USE_SSL

#  include "ssl.h"

#endif

#define BUFFSIZE        8192

typedef gint (*SockAddrFunc)        (GList                *addr_list,

                                 gpointer         data);

typedef struct _SockConnectData        SockConnectData;

typedef struct _SockLookupData        SockLookupData;

typedef struct _SockAddrData        SockAddrData;

typedef struct _SockSource        SockSource;

struct _SockConnectData {

        gint id;

        gchar *hostname;

        gushort port;

        GList *addr_list;

        GList *cur_addr;

        SockLookupData *lookup_data;

        GIOChannel *channel;

        guint io_tag;

        SockConnectFunc func;

        gpointer data;

};

struct _SockLookupData {

        gchar *hostname;

        pid_t child_pid;

        GIOChannel *channel;

        guint io_tag;

        SockAddrFunc func;

        gpointer data;

};

struct _SockAddrData {

        gint family;

        gint socktype;

        gint protocol;

        gint addr_len;

        struct sockaddr *addr;

};

struct _SockSource {

        GSource parent;

        SockInfo *sock;

};

static guint io_timeout = 60;

static GList *sock_connect_data_list = NULL;

static gboolean sock_prepare                (GSource        *source,

                                         gint                *timeout);

static gboolean sock_check                (GSource        *source);

static gboolean sock_dispatch                (GSource        *source,

                                         GSourceFunc         callback,

                                         gpointer         user_data);

GSourceFuncs sock_watch_funcs = {

        sock_prepare,

        sock_check,

        sock_dispatch,

        NULL

};

static gint sock_connect_with_timeout        (gint                         sock,

                                         const struct sockaddr        *serv_addr,

                                         gint                         addrlen,

                                         guint                         timeout_secs);

#ifndef INET6

static gint sock_connect_by_hostname        (gint                 sock,

                                         const gchar        *hostname,

                                         gushort         port);

#else

static gint sock_connect_by_getaddrinfo        (const gchar        *hostname,

                                         gushort         port);

#endif

#ifdef G_OS_UNIX

static void sock_address_list_free                (GList                *addr_list);

static gboolean sock_connect_async_cb                (GIOChannel        *source,

                                                 GIOCondition         condition,

                                                 gpointer         data);

static gint sock_connect_async_get_address_info_cb

                                                (GList                *addr_list,

                                                 gpointer         data);

static gint sock_connect_address_list_async        (SockConnectData *conn_data);

static gboolean sock_get_address_info_async_cb        (GIOChannel        *source,

                                                 GIOCondition         condition,

                                                 gpointer         data);

static SockLookupData *sock_get_address_info_async

                                                (const gchar        *hostname,

                                                 gushort         port,

                                                 SockAddrFunc         func,

                                                 gpointer         data);

static gint sock_get_address_info_async_cancel        (SockLookupData        *lookup_data);

#endif /* G_OS_UNIX */

gint sock_init(void)

{

#ifdef G_OS_WIN32

        WSADATA wsadata;

        gint result;

        result = WSAStartup(MAKEWORD(2, 2), &wsadata);

        if (result != NO_ERROR) {

                g_warning("WSAStartup() failed\n");

                return -1;

        }

#endif

        return 0;

}

gint sock_cleanup(void)

{

#ifdef G_OS_WIN32

        WSACleanup();

#endif

        return 0;

}

gint sock_set_io_timeout(guint sec)

{

        io_timeout = sec;

        return 0;

}

gint fd_connect_unix(const gchar *path)

{

#ifdef G_OS_UNIX

        gint sock;

        struct sockaddr_un addr;

        sock = socket(PF_UNIX, SOCK_STREAM, 0);

        if (sock < 0) {

                perror("sock_connect_unix(): socket");

                return -1;

        }

        memset(&addr, 0, sizeof(addr));

        addr.sun_family = AF_UNIX;

        strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);

        if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {

                fd_close(sock);

                return -1;

        }

        return sock;

#else

        return -1;

#endif

}

gint fd_open_unix(const gchar *path)

{

#ifdef G_OS_UNIX

        gint sock;

        struct sockaddr_un addr;

        sock = socket(PF_UNIX, SOCK_STREAM, 0);

        if (sock < 0) {

                perror("sock_open_unix(): socket");

                return -1;

        }

        memset(&addr, 0, sizeof(addr));

        addr.sun_family = AF_UNIX;

        strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);

        if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {

                perror("bind");

                fd_close(sock);

                return -1;

        }

        if (listen(sock, 1) < 0) {

                perror("listen");

                fd_close(sock);

                return -1;                

        }

        return sock;

#else

        return -1;

#endif

}

gint fd_accept(gint sock)

{

#ifdef G_OS_UNIX

        struct sockaddr_in caddr;

        guint caddr_len;

        caddr_len = sizeof(caddr);

        return accept(sock, (struct sockaddr *)&caddr, &caddr_len);

#else

        return -1;

#endif

}

static gint set_nonblocking_mode(gint fd, gboolean nonblock)

{

#ifdef G_OS_UNIX

        gint flags;

        flags = fcntl(fd, F_GETFL, 0);

        if (flags < 0) {

                perror("fcntl");

                return -1;

        }

        if (nonblock)

                flags |= O_NONBLOCK;

        else

                flags &= ~O_NONBLOCK;

        return fcntl(fd, F_SETFL, flags);

#else

        return -1;

#endif

}

gint sock_set_nonblocking_mode(SockInfo *sock, gboolean nonblock)

{

        g_return_val_if_fail(sock != NULL, -1);

        return set_nonblocking_mode(sock->sock, nonblock);

}

static gboolean is_nonblocking_mode(gint fd)

{

#ifdef G_OS_UNIX

        gint flags;

        flags = fcntl(fd, F_GETFL, 0);

        if (flags < 0) {

                perror("fcntl");

                return FALSE;

        }

        return ((flags & O_NONBLOCK) != 0);

#else

        return FALSE;

#endif

}

gboolean sock_is_nonblocking_mode(SockInfo *sock)

{

        g_return_val_if_fail(sock != NULL, FALSE);

        return is_nonblocking_mode(sock->sock);

}

static gboolean sock_prepare(GSource *source, gint *timeout)

{

        *timeout = 1;

        return FALSE;

}

static gboolean sock_check(GSource *source)

{

        SockInfo *sock = ((SockSource *)source)->sock;

        struct timeval timeout = {0, 0};

        fd_set fds;

        GIOCondition condition = sock->condition;

#if USE_SSL

        if (sock->ssl) {

                if (condition & G_IO_IN) {

                        if (SSL_pending(sock->ssl) > 0)

                                return TRUE;

                        if (SSL_want_write(sock->ssl))

                                condition |= G_IO_OUT;

                }

                if (condition & G_IO_OUT) {

                        if (SSL_want_read(sock->ssl))

                                condition |= G_IO_IN;

                }

        }

#endif

        FD_ZERO(&fds);

        FD_SET(sock->sock, &fds);

        select(sock->sock + 1,

               (condition & G_IO_IN)  ? &fds : NULL,

               (condition & G_IO_OUT) ? &fds : NULL,

               NULL, &timeout);

        return FD_ISSET(sock->sock, &fds) != 0;

}

static gboolean sock_dispatch(GSource *source, GSourceFunc callback,

                              gpointer user_data)

{

        SockInfo *sock = ((SockSource *)source)->sock;

        return sock->callback(sock, sock->condition, sock->data);

}

static gboolean sock_watch_cb(GIOChannel *source, GIOCondition condition,

                              gpointer data)

{

        SockInfo *sock = (SockInfo *)data;

        if ((condition & sock->condition) == 0)

                return TRUE;

        return sock->callback(sock, sock->condition, sock->data);

}

guint sock_add_watch(SockInfo *sock, GIOCondition condition, SockFunc func,

                     gpointer data)

{

        sock->callback = func;

        sock->condition = condition;

        sock->data = data;

#if USE_SSL

        if (sock->ssl) {

                GSource *source;

                source = g_source_new(&sock_watch_funcs, sizeof(SockSource));

                ((SockSource *)source)->sock = sock;

                g_source_set_priority(source, G_PRIORITY_DEFAULT);

                g_source_set_can_recurse(source, FALSE);

                return g_source_attach(source, NULL);

        }

#endif

        return g_io_add_watch(sock->sock_ch, condition, sock_watch_cb, sock);

}

static gint fd_check_io(gint fd, GIOCondition cond)

{

        struct timeval timeout;

        fd_set fds;

        if (is_nonblocking_mode(fd))

                return 0;

        timeout.tv_sec  = io_timeout;

        timeout.tv_usec = 0;

        FD_ZERO(&fds);

        FD_SET(fd, &fds);

        if (cond == G_IO_IN) {

                select(fd + 1, &fds, NULL, NULL,

                       io_timeout > 0 ? &timeout : NULL);

        } else {

                select(fd + 1, NULL, &fds, NULL,

                       io_timeout > 0 ? &timeout : NULL);

        }

        if (FD_ISSET(fd, &fds)) {

                return 0;

        } else {

                g_warning("Socket IO timeout\n");

                return -1;

        }

}

#ifdef G_OS_UNIX

static sigjmp_buf jmpenv;

static void timeout_handler(gint sig)

{

        siglongjmp(jmpenv, 1);

}

#endif

static gint sock_connect_with_timeout(gint sock,

                                      const struct sockaddr *serv_addr,

                                      gint addrlen,

                                      guint timeout_secs)

{

        gint ret;

#ifdef G_OS_UNIX

        void (*prev_handler)(gint);

        alarm(0);

        prev_handler = signal(SIGALRM, timeout_handler);

        if (sigsetjmp(jmpenv, 1)) {

                alarm(0);

                signal(SIGALRM, prev_handler);

                errno = ETIMEDOUT;

                return -1;

        }

        alarm(timeout_secs);

#endif

        ret = connect(sock, serv_addr, addrlen);

#ifdef G_OS_UNIX

        alarm(0);

        signal(SIGALRM, prev_handler);

#endif

        return ret;

}

struct hostent *my_gethostbyname(const gchar *hostname)

{

        struct hostent *hp;

#ifdef G_OS_UNIX

        void (*prev_handler)(gint);

        alarm(0);

        prev_handler = signal(SIGALRM, timeout_handler);

        if (sigsetjmp(jmpenv, 1)) {

                alarm(0);

                signal(SIGALRM, prev_handler);

                fprintf(stderr, "%s: host lookup timed out.\n", hostname);

                errno = 0;

                return NULL;

        }

        alarm(io_timeout);

#endif

        if ((hp = gethostbyname(hostname)) == NULL) {

#ifdef G_OS_UNIX

                alarm(0);

                signal(SIGALRM, prev_handler);

#endif

                fprintf(stderr, "%s: unknown host.\n", hostname);

                errno = 0;

                return NULL;

        }

#ifdef G_OS_UNIX

        alarm(0);

        signal(SIGALRM, prev_handler);

#endif

        return hp;

}

#ifndef INET6

static gint my_inet_aton(const gchar *hostname, struct in_addr *inp)

{

#if HAVE_INET_ATON

        return inet_aton(hostname, inp);

#else

#if HAVE_INET_ADDR

        guint32 inaddr;

        inaddr = inet_addr(hostname);

        if (inaddr != -1) {

                memcpy(inp, &inaddr, sizeof(inaddr));

                return 1;

        } else

                return 0;

#else

        return 0;

#endif

#endif /* HAVE_INET_ATON */

}

static gint sock_connect_by_hostname(gint sock, const gchar *hostname,

                                     gushort port)

{

        struct hostent *hp;

        struct sockaddr_in ad;

        memset(&ad, 0, sizeof(ad));

        ad.sin_family = AF_INET;

        ad.sin_port = htons(port);

        if (!my_inet_aton(hostname, &ad.sin_addr)) {

                if ((hp = my_gethostbyname(hostname)) == NULL) {

                        fprintf(stderr, "%s: unknown host.\n", hostname);

                        errno = 0;

                        return -1;

                }

                if (hp->h_length != 4 && hp->h_length != 8) {

                        fprintf(stderr, "illegal address length received for host %s\n", hostname);

                        errno = 0;

                        return -1;

                }

                memcpy(&ad.sin_addr, hp->h_addr, hp->h_length);

        }

        return sock_connect_with_timeout(sock, (struct sockaddr *)&ad,

                                         sizeof(ad), io_timeout);

}

#else /* INET6 */

static gint sock_connect_by_getaddrinfo(const gchar *hostname, gushort        port)

{

        gint sock = -1, gai_error;

        struct addrinfo hints, *res, *ai;

        gchar port_str[6];

        memset(&hints, 0, sizeof(hints));

        /* hints.ai_flags = AI_CANONNAME; */

        hints.ai_family = AF_UNSPEC;

        hints.ai_socktype = SOCK_STREAM;

        hints.ai_protocol = IPPROTO_TCP;

        /* convert port from integer to string. */

        g_snprintf(port_str, sizeof(port_str), "%d", port);

        if ((gai_error = getaddrinfo(hostname, port_str, &hints, &res)) != 0) {

                fprintf(stderr, "getaddrinfo for %s:%s failed: %s\n",

                        hostname, port_str, gai_strerror(gai_error));

                return -1;

        }

        for (ai = res; ai != NULL; ai = ai->ai_next) {

                sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);

                if (sock < 0)

                        continue;

                if (sock_connect_with_timeout

                        (sock, ai->ai_addr, ai->ai_addrlen, io_timeout) == 0)

                        break;

                fd_close(sock);

        }

        if (res != NULL)

                freeaddrinfo(res);

        if (ai == NULL)

                return -1;

        return sock;

}

#endif /* !INET6 */

SockInfo *sock_connect(const gchar *hostname, gushort port)

{

#ifdef G_OS_WIN32

        SOCKET sock;

#else

        gint sock;

#endif

        SockInfo *sockinfo;

#ifdef INET6

        if ((sock = sock_connect_by_getaddrinfo(hostname, port)) < 0)

                return NULL;

#else

#ifdef G_OS_WIN32

        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {

                g_warning("socket() failed: %ld\n", WSAGetLastError());

#else

        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {

                perror("socket");

#endif /* G_OS_WIN32 */

                return NULL;

        }

        if (sock_connect_by_hostname(sock, hostname, port) < 0) {

                if (errno != 0) perror("connect");

                fd_close(sock);

                return NULL;

        }

#endif /* INET6 */

        sockinfo = g_new0(SockInfo, 1);

        sockinfo->sock = sock;

        sockinfo->sock_ch = g_io_channel_unix_new(sock);

        sockinfo->hostname = g_strdup(hostname);

        sockinfo->port = port;

        sockinfo->state = CONN_ESTABLISHED;

        g_usleep(100000);

        return sockinfo;

}

#ifdef G_OS_UNIX

static void sock_address_list_free(GList *addr_list)

{

        GList *cur;

        for (cur = addr_list; cur != NULL; cur = cur->next) {

                SockAddrData *addr_data = (SockAddrData *)cur->data;

                g_free(addr_data->addr);

                g_free(addr_data);

        }

        g_list_free(addr_list);

}

/* asynchronous TCP connection */

static gboolean sock_connect_async_cb(GIOChannel *source,

                                      GIOCondition condition, gpointer data)

{

        SockConnectData *conn_data = (SockConnectData *)data;

        gint fd;

        gint val;

        guint len;

        SockInfo *sockinfo;

        fd = g_io_channel_unix_get_fd(source);

        conn_data->io_tag = 0;

        conn_data->channel = NULL;

        g_io_channel_unref(source);

        len = sizeof(val);

        if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &val, &len) < 0) {

                perror("getsockopt");

                fd_close(fd);

                sock_connect_address_list_async(conn_data);

                return FALSE;

        }

        if (val != 0) {

                fd_close(fd);

                sock_connect_address_list_async(conn_data);

                return FALSE;

        }

        sockinfo = g_new0(SockInfo, 1);

        sockinfo->sock = fd;

        sockinfo->sock_ch = g_io_channel_unix_new(fd);

        sockinfo->hostname = g_strdup(conn_data->hostname);

        sockinfo->port = conn_data->port;

        sockinfo->state = CONN_ESTABLISHED;

        conn_data->func(sockinfo, conn_data->data);

        sock_connect_async_cancel(conn_data->id);

        return FALSE;

}

static gint sock_connect_async_get_address_info_cb(GList *addr_list,

                                                   gpointer data)

{

        SockConnectData *conn_data = (SockConnectData *)data;

        conn_data->addr_list = addr_list;

        conn_data->cur_addr = addr_list;

        conn_data->lookup_data = NULL;

        return sock_connect_address_list_async(conn_data);

}

gint sock_connect_async(const gchar *hostname, gushort port,

                        SockConnectFunc func, gpointer data)

{

        static gint id = 1;

        SockConnectData *conn_data;

        conn_data = g_new0(SockConnectData, 1);

        conn_data->id = id++;

        conn_data->hostname = g_strdup(hostname);

        conn_data->port = port;

        conn_data->addr_list = NULL;

        conn_data->cur_addr = NULL;

        conn_data->io_tag = 0;

        conn_data->func = func;

        conn_data->data = data;

        conn_data->lookup_data = sock_get_address_info_async

                (hostname, port, sock_connect_async_get_address_info_cb,

                 conn_data);

        if (conn_data->lookup_data == NULL) {

                g_free(conn_data->hostname);

                g_free(conn_data);

                return -1;

        }

        sock_connect_data_list = g_list_append(sock_connect_data_list,

                                               conn_data);

        return conn_data->id;

}

gint sock_connect_async_cancel(gint id)

{

        SockConnectData *conn_data = NULL;

        GList *cur;

        for (cur = sock_connect_data_list; cur != NULL; cur = cur->next) {

                if (((SockConnectData *)cur->data)->id == id) {

                        conn_data = (SockConnectData *)cur->data;

                        break;

                }

        }

        if (conn_data) {

                sock_connect_data_list = g_list_remove(sock_connect_data_list,

                                                       conn_data);

                if (conn_data->lookup_data)

                        sock_get_address_info_async_cancel

                                (conn_data->lookup_data);

                if (conn_data->io_tag > 0)

                        g_source_remove(conn_data->io_tag);

                if (conn_data->channel) {

                        g_io_channel_shutdown(conn_data->channel, FALSE, NULL);

                        g_io_channel_unref(conn_data->channel);

                }

                sock_address_list_free(conn_data->addr_list);

                g_free(conn_data->hostname);

                g_free(conn_data);

        } else {

                g_warning("sock_connect_async_cancel: id %d not found.\n", id);

                return -1;

        }

        return 0;

}

static gint sock_connect_address_list_async(SockConnectData *conn_data)

{

        SockAddrData *addr_data;

        gint sock = -1;

        for (; conn_data->cur_addr != NULL;

             conn_data->cur_addr = conn_data->cur_addr->next) {

                addr_data = (SockAddrData *)conn_data->cur_addr->data;

                if ((sock = socket(addr_data->family, addr_data->socktype,

                                   addr_data->protocol)) < 0) {

                        perror("socket");

                        continue;

                }

                set_nonblocking_mode(sock, TRUE);

                if (connect(sock, addr_data->addr, addr_data->addr_len) < 0) {

                        if (EINPROGRESS == errno) {

                                break;

                        } else {

                                perror("connect");

                                fd_close(sock);

                        }

                } else

                        break;

        }

        if (conn_data->cur_addr == NULL) {

                g_warning("sock_connect_address_list_async: "

                          "connection to %s:%d failed\n",

                          conn_data->hostname, conn_data->port);

                conn_data->func(NULL, conn_data->data);

                sock_connect_async_cancel(conn_data->id);

                return -1;

        }

        conn_data->cur_addr = conn_data->cur_addr->next;

        conn_data->channel = g_io_channel_unix_new(sock);

        conn_data->io_tag = g_io_add_watch(conn_data->channel, G_IO_OUT,

                                           sock_connect_async_cb, conn_data);

        return 0;

}

/* asynchronous DNS lookup */

static gboolean sock_get_address_info_async_cb(GIOChannel *source,

                                               GIOCondition condition,

                                               gpointer data)

{

        SockLookupData *lookup_data = (SockLookupData *)data;

        GList *addr_list = NULL;

        SockAddrData *addr_data;

        gsize bytes_read;

        gint ai_member[4];

        struct sockaddr *addr;

        for (;;) {

                if (g_io_channel_read(source, (gchar *)ai_member,

                                      sizeof(ai_member), &bytes_read)

                    != G_IO_ERROR_NONE) {

                        g_warning("sock_get_address_info_async_cb: "

                                  "address length read error\n");

                        break;

                }

                if (bytes_read == 0 || bytes_read != sizeof(ai_member))

                        break;

                if (ai_member[0] == AF_UNSPEC) {

                        g_warning("DNS lookup failed\n");

                        break;

                }

                addr = g_malloc(ai_member[3]);

                if (g_io_channel_read(source, (gchar *)addr, ai_member[3],

                                      &bytes_read)

                    != G_IO_ERROR_NONE) {

                        g_warning("sock_get_address_info_async_cb: "

                                  "address data read error\n");

                        g_free(addr);

                        break;

                }

                if (bytes_read != ai_member[3]) {

                        g_warning("sock_get_address_info_async_cb: "

                                  "incomplete address data\n");

                        g_free(addr);

                        break;

                }

                addr_data = g_new0(SockAddrData, 1);

                addr_data->family = ai_member[0];

                addr_data->socktype = ai_member[1];

                addr_data->protocol = ai_member[2];

                addr_data->addr_len = ai_member[3];

                addr_data->addr = addr;

                addr_list = g_list_append(addr_list, addr_data);

        }

        g_io_channel_shutdown(source, FALSE, NULL);

        g_io_channel_unref(source);

        kill(lookup_data->child_pid, SIGKILL);

        waitpid(lookup_data->child_pid, NULL, 0);

        lookup_data->func(addr_list, lookup_data->data);

        g_free(lookup_data->hostname);

        g_free(lookup_data);

        return FALSE;

}

static SockLookupData *sock_get_address_info_async(const gchar *hostname,

                                                   gushort port,

                                                   SockAddrFunc func,

                                                   gpointer data)

{

        SockLookupData *lookup_data = NULL;

        gint pipe_fds[2];

        pid_t pid;

        if (pipe(pipe_fds) < 0) {

                perror("pipe");

                func(NULL, data);

                return NULL;

        }

        if ((pid = fork()) < 0) {

                perror("fork");

                func(NULL, data);

                return NULL;

        }

        /* child process */

        if (pid == 0) {

#ifdef INET6

                gint gai_err;

                struct addrinfo hints, *res, *ai;

                gchar port_str[6];

#else /* !INET6 */

                struct hostent *hp;

                gchar **addr_list_p;

                struct sockaddr_in ad;

#endif /* INET6 */

                gint ai_member[4] = {AF_UNSPEC, 0, 0, 0};

                close(pipe_fds[0]);

#ifdef INET6

                memset(&hints, 0, sizeof(hints));

                /* hints.ai_flags = AI_CANONNAME; */

                hints.ai_family = AF_UNSPEC;

                hints.ai_socktype = SOCK_STREAM;

                hints.ai_protocol = IPPROTO_TCP;

                g_snprintf(port_str, sizeof(port_str), "%d", port);

                gai_err = getaddrinfo(hostname, port_str, &hints, &res);

                if (gai_err != 0) {

                        g_warning("getaddrinfo for %s:%s failed: %s\n",

                                  hostname, port_str, gai_strerror(gai_err));

                        fd_write_all(pipe_fds[1], (gchar *)ai_member,

                                     sizeof(ai_member));

                        close(pipe_fds[1]);

                        _exit(1);

                }

                for (ai = res; ai != NULL; ai = ai->ai_next) {

                        ai_member[0] = ai->ai_family;

                        ai_member[1] = ai->ai_socktype;

                        ai_member[2] = ai->ai_protocol;

                        ai_member[3] = ai->ai_addrlen;

                        fd_write_all(pipe_fds[1], (gchar *)ai_member,

                                     sizeof(ai_member));

                        fd_write_all(pipe_fds[1], (gchar *)ai->ai_addr,

                                     ai->ai_addrlen);

                }

                if (res != NULL)

                        freeaddrinfo(res);

#else /* !INET6 */

                hp = my_gethostbyname(hostname);

                if (hp == NULL || hp->h_addrtype != AF_INET) {

                        fd_write_all(pipe_fds[1], (gchar *)ai_member,

                                     sizeof(ai_member));

                        close(pipe_fds[1]);

                        _exit(1);

                }

                ai_member[0] = AF_INET;

                ai_member[1] = SOCK_STREAM;

                ai_member[2] = IPPROTO_TCP;

                ai_member[3] = sizeof(ad);

                memset(&ad, 0, sizeof(ad));

                ad.sin_family = AF_INET;

                ad.sin_port = htons(port);

                for (addr_list_p = hp->h_addr_list; *addr_list_p != NULL;

                     addr_list_p++) {

                        memcpy(&ad.sin_addr, *addr_list_p, hp->h_length);

                        fd_write_all(pipe_fds[1], (gchar *)ai_member,

                                     sizeof(ai_member));

                        fd_write_all(pipe_fds[1], (gchar *)&ad, sizeof(ad));

                }

#endif /* INET6 */

                close(pipe_fds[1]);

                _exit(0);

        } else {

                close(pipe_fds[1]);

                lookup_data = g_new0(SockLookupData, 1);

                lookup_data->hostname = g_strdup(hostname);

                lookup_data->child_pid = pid;

                lookup_data->func = func;

                lookup_data->data = data;

                lookup_data->channel = g_io_channel_unix_new(pipe_fds[0]);

                lookup_data->io_tag = g_io_add_watch

                        (lookup_data->channel, G_IO_IN,

                         sock_get_address_info_async_cb, lookup_data);

        }

        return lookup_data;

}

static gint sock_get_address_info_async_cancel(SockLookupData *lookup_data)

{

        if (lookup_data->io_tag > 0)

                g_source_remove(lookup_data->io_tag);

        if (lookup_data->channel) {

                g_io_channel_shutdown(lookup_data->channel, FALSE, NULL);

                g_io_channel_unref(lookup_data->channel);

        }

        if (lookup_data->child_pid > 0) {

                kill(lookup_data->child_pid, SIGKILL);

                waitpid(lookup_data->child_pid, NULL, 0);

        }

        g_free(lookup_data->hostname);

        g_free(lookup_data);

        return 0;

}

#endif /* G_OS_UNIX */

gint sock_printf(SockInfo *sock, const gchar *format, ...)

{

        va_list args;

        gchar buf[BUFFSIZE];

        va_start(args, format);

        g_vsnprintf(buf, sizeof(buf), format, args);

        va_end(args);

        return sock_write_all(sock, buf, strlen(buf));

}

gint sock_read(SockInfo *sock, gchar *buf, gint len)

{

        g_return_val_if_fail(sock != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_read(sock->ssl, buf, len);

#endif

        return fd_read(sock->sock, buf, len);

}

gint fd_read(gint fd, gchar *buf, gint len)

{

        if (fd_check_io(fd, G_IO_IN) < 0)

                return -1;

#ifdef G_OS_WIN32

        return recv(fd, buf, len, 0);

#else

        return read(fd, buf, len);

#endif

}

#if USE_SSL

gint ssl_read(SSL *ssl, gchar *buf, gint len)

{

        gint err, ret;

        if (SSL_pending(ssl) == 0) {

                if (fd_check_io(SSL_get_rfd(ssl), G_IO_IN) < 0)

                        return -1;

        }

        ret = SSL_read(ssl, buf, len);

        switch ((err = SSL_get_error(ssl, ret))) {

        case SSL_ERROR_NONE:

                return ret;

        case SSL_ERROR_WANT_READ:

        case SSL_ERROR_WANT_WRITE:

                errno = EAGAIN;

                return -1;

        case SSL_ERROR_ZERO_RETURN:

                return 0;

        default:

                g_warning("SSL_read() returned error %d, ret = %d\n", err, ret);

                if (ret == 0)

                        return 0;

                return -1;

        }

}

#endif

gint sock_write(SockInfo *sock, const gchar *buf, gint len)

{

        g_return_val_if_fail(sock != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_write(sock->ssl, buf, len);

#endif

        return fd_write(sock->sock, buf, len);

}

gint fd_write(gint fd, const gchar *buf, gint len)

{

        if (fd_check_io(fd, G_IO_OUT) < 0)

                return -1;

#ifdef G_OS_WIN32

        return send(fd, buf, len, 0);

#else

        return write(fd, buf, len);

#endif

}

#if USE_SSL

gint ssl_write(SSL *ssl, const gchar *buf, gint len)

{

        gint ret;

        ret = SSL_write(ssl, buf, len);

        switch (SSL_get_error(ssl, ret)) {

        case SSL_ERROR_NONE:

                return ret;

        case SSL_ERROR_WANT_READ:

        case SSL_ERROR_WANT_WRITE:

                errno = EAGAIN;

                return -1;

        default:

                return -1;

        }

}

#endif

gint sock_write_all(SockInfo *sock, const gchar *buf, gint len)

{

        g_return_val_if_fail(sock != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_write_all(sock->ssl, buf, len);

#endif

        return fd_write_all(sock->sock, buf, len);

}

gint fd_write_all(gint fd, const gchar *buf, gint len)

{

        gint n, wrlen = 0;

        while (len) {

                n = fd_write(fd, buf, len);

                if (n <= 0)

                        return -1;

                len -= n;

                wrlen += n;

                buf += n;

        }

        return wrlen;

}

#if USE_SSL

gint ssl_write_all(SSL *ssl, const gchar *buf, gint len)

{

        gint n, wrlen = 0;

        while (len) {

                n = ssl_write(ssl, buf, len);

                if (n <= 0)

                        return -1;

                len -= n;

                wrlen += n;

                buf += n;

        }

        return wrlen;

}

#endif

gint fd_recv(gint fd, gchar *buf, gint len, gint flags)

{

        if (fd_check_io(fd, G_IO_IN) < 0)

                return -1;

        return recv(fd, buf, len, flags);

}

gint fd_gets(gint fd, gchar *buf, gint len)

{

        gchar *newline, *bp = buf;

        gint n;

        if (--len < 1)

                return -1;

        do {

                if ((n = fd_recv(fd, bp, len, MSG_PEEK)) <= 0)

                        return -1;

                if ((newline = memchr(bp, '\n', n)) != NULL)

                        n = newline - bp + 1;

                if ((n = fd_read(fd, bp, n)) < 0)

                        return -1;

                bp += n;

                len -= n;

        } while (!newline && len);

        *bp = '\0';

        return bp - buf;

}

#if USE_SSL

gint ssl_gets(SSL *ssl, gchar *buf, gint len)

{

        gchar *newline, *bp = buf;

        gint n;

        if (--len < 1)

                return -1;

        do {

                if ((n = ssl_peek(ssl, bp, len)) <= 0)

                        return -1;

                if ((newline = memchr(bp, '\n', n)) != NULL)

                        n = newline - bp + 1;

                if ((n = ssl_read(ssl, bp, n)) < 0)

                        return -1;

                bp += n;

                len -= n;

        } while (!newline && len);

        *bp = '\0';

        return bp - buf;

}

#endif

gint sock_gets(SockInfo *sock, gchar *buf, gint len)

{

        g_return_val_if_fail(sock != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_gets(sock->ssl, buf, len);

#endif

        return fd_gets(sock->sock, buf, len);

}

gint fd_getline(gint fd, gchar **line)

{

        gchar buf[BUFFSIZE];

        gchar *str = NULL;

        gint len;

        gulong size = 0;

        gulong cur_offset = 0;

        while ((len = fd_gets(fd, buf, sizeof(buf))) > 0) {

                size += len;

                str = g_realloc(str, size + 1);

                memcpy(str + cur_offset, buf, len + 1);

                cur_offset += len;

                if (buf[len - 1] == '\n')

                        break;

        }

        *line = str;

        if (!str)

                return -1;

        else

                return (gint)size;

}

#if USE_SSL

gint ssl_getline(SSL *ssl, gchar **line)

{

        gchar buf[BUFFSIZE];

        gchar *str = NULL;

        gint len;

        gulong size = 0;

        gulong cur_offset = 0;

        while ((len = ssl_gets(ssl, buf, sizeof(buf))) > 0) {

                size += len;

                str = g_realloc(str, size + 1);

                memcpy(str + cur_offset, buf, len + 1);

                cur_offset += len;

                if (buf[len - 1] == '\n')

                        break;

        }

        *line = str;

        if (!str)

                return -1;

        else

                return (gint)size;

}

#endif

gint sock_getline(SockInfo *sock, gchar **line)

{

        g_return_val_if_fail(sock != NULL, -1);

        g_return_val_if_fail(line != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_getline(sock->ssl, line);

#endif

        return fd_getline(sock->sock, line);

}

gint sock_puts(SockInfo *sock, const gchar *buf)

{

        gint ret;

        if ((ret = sock_write_all(sock, buf, strlen(buf))) < 0)

                return ret;

        return sock_write_all(sock, "\r\n", 2);

}

/* peek at the socket data without actually reading it */

#if USE_SSL

gint ssl_peek(SSL *ssl, gchar *buf, gint len)

{

        gint err, ret;

        if (SSL_pending(ssl) == 0) {

                if (fd_check_io(SSL_get_rfd(ssl), G_IO_IN) < 0)

                        return -1;

        }

        ret = SSL_peek(ssl, buf, len);

        switch ((err = SSL_get_error(ssl, ret))) {

        case SSL_ERROR_NONE:

                return ret;

        case SSL_ERROR_WANT_READ:

        case SSL_ERROR_WANT_WRITE:

                errno = EAGAIN;

                return -1;

        case SSL_ERROR_ZERO_RETURN:

                return 0;

        default:

                g_warning("SSL_peek() returned error %d, ret = %d\n", err, ret);

                if (ret == 0)

                        return 0;

                return -1;

        }

}

#endif

gint sock_peek(SockInfo *sock, gchar *buf, gint len)

{

        g_return_val_if_fail(sock != NULL, -1);

#if USE_SSL

        if (sock->ssl)

                return ssl_peek(sock->ssl, buf, len);

#endif

        return fd_recv(sock->sock, buf, len, MSG_PEEK);

}

gint sock_close(SockInfo *sock)

{

        if (!sock)

                return 0;

#if USE_SSL

        if (sock->ssl)

                ssl_done_socket(sock);

#endif

        if (sock->sock_ch) {