sudo add-apt-repository ppa:emptyhua/toolbox
sudo apt-get update
sudo apt-get install pidgin-autostatus

sudo apt-get install libglib2.0-dev libnm-glib-dev  libdbus-glib-1-dev network-manager-dev libgtk2.0-dev libtool pidgin-dev
svn checkout http://pidgin-auto-status.googlecode.com/svn/trunk/ pidgin-autostatus
cd pidgin-autostatus
make
sudo make install

C:<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xmlns:ack='http://www.xmpp.org/extensions/xep-0198.html#ns'>
S:<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' version='1.0' id='yqvecsv64nooedcwo2mbt6f8x08krmlpch3oazve'>

S:<stream:features xmlns:stream='http://etherx.jabber.org/streams'><mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><mechanism>DIGEST-MD5</mechanism></mechanisms></stream:features>

C:<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'/>

S:<challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>cmVhbG09ImphYmJlcmQtcm91dGVyIiwgbm9uY2U9Ii8xb0tDempxMXRNSUlLUHlOYTNCSHc9PSIsIHFvcD0iYXV0aCIsIGNoYXJzZXQ9dXRmLTgsIGFsZ29yaXRobT1tZDUtc2Vzcw==</challenge>

C:<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>dXNlcm5hbWU9ImphYmJlcmQiLCByZWFsbT0iamFiYmVyZC1yb3V0ZXIiLCBub25jZT0iLzFvS0N6anExdE1JSUtQeU5hM0JIdz09IiwgY25vbmNlPSJueFZNempncTI1VUZtTjZmdUozdEZ3PT0iLCBuYz0wMDAwMDAwMSwgcW9wPWF1dGgsIGRpZ2VzdC11cmk9ImphYmJlcmQtcm91dGVyL2lwLTEwLTEzMC0xODctMTU1IiwgcmVzcG9uc2U9Yzg5NjJlNDgwZTVlYmM0ZjFkNjZiZDhlNDBiNjZlZjIsIGNoYXJzZXQ9dXRmLTg=</response>

S:<challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>cnNwYXV0aD1hM2IyMGI0YzZkMzgxNmE3MzVjMWJhNTRjZTVkYmFjYQ==</challenge>

C:<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>

S:<success xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>

//注册了以下几个回调函数
p->unload = _sx_sasl_unload;
//当数据送出时回调，貌似有的验证方法需要对送出的数据加密
p->wio = _sx_sasl_wio;
//当读入数据时回调，就是解密读入的数据
p->rio = _sx_sasl_rio;
 
//当一个strem建立时回调
p->stream = _sx_sasl_stream;
//当声明自己都有哪些特性时回调
p->features = _sx_sasl_features;
//当处理xml时回调
p->process = _sx_sasl_process;

<stream:features xmlns:stream='http://etherx.jabber.org/streams'><mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><mechanism>DIGEST-MD5</mechanism></mechanisms></stream:features>

<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'/>

<challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>cmVhbG09ImphYmJlcmQtcm91dGVyIiwgbm9uY2U9Ii8xb0tDempxMXRNSUlLUHlOYTNCSHc9PSIsIHFvcD0iYXV0aCIsIGNoYXJzZXQ9dXRmLTgsIGFsZ29yaXRobT1tZDUtc2Vzcw==</challenge>

static void _sx_sasl_server_process(sx_t s, sx_plugin_t p, Gsasl_session *sd, char *in, int inlen) {
    char *buf = NULL, *out = NULL;
    size_t buflen, outlen;
    int ret;
 
    _sx_debug(ZONE, "data from client");
 
    /* decode the response */
    ret = gsasl_base64_from(in, inlen, &buf, &buflen);
 
    if (ret == GSASL_OK) {
        _sx_debug(ZONE, "decoded data: %.*s", buflen, buf);
 
        /* process the data */
        ret = gsasl_step(sd, buf, buflen, &out, &outlen);
        if(buf != NULL) free(buf); buf = NULL;
 
        /* in progress */
        if(ret == GSASL_OK || ret == GSASL_NEEDS_MORE) {
            _sx_debug(ZONE, "sasl handshake in progress (response: %.*s)", outlen, out);
 
            /* encode the response */
            ret = gsasl_base64_to(out, outlen, &buf, &buflen);
 
            if (ret == GSASL_OK) {
                _sx_nad_write(s, _sx_sasl_response(s, buf, buflen), 0);
            }
 
            if(out != NULL) free(out);
            if(buf != NULL) free(buf);
 
            return;
        }
    }
    if(out != NULL) free(out);
    if(buf != NULL) free(buf);
 
    /* its over */
    _sx_debug(ZONE, "sasl handshake aborted; (%d): %s", ret, gsasl_strerror(ret));
 
    _sx_nad_write(s, _sx_sasl_abort(s), 0);
}

<success xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>

/* success */
else if(NAD_ENAME_L(nad, 0) == 7 && strncmp("success", NAD_ENAME(nad, 0), NAD_ENAME_L(nad, 0)) == 0) {
    _sx_debug(ZONE, "sasl handshake completed, resetting");
    nad_free(nad);
 
    /* save interesting bits */
    flags = s->flags;
 
    if(s->ns != NULL) ns = strdup(s->ns);
 
    if(s->req_to != NULL) to = strdup(s->req_to);
    if(s->req_from != NULL) from = strdup(s->req_from);
    if(s->req_version != NULL) version = strdup(s->req_version);
 
    /* reset state */
    _sx_reset(s);
 
    _sx_debug(ZONE, "restarting stream with sasl layer established");
 
    /* second time round */
    sx_client_init(s, flags, ns, to, from, version);
 
    /* free bits */
    if(ns != NULL) free(ns);
    if(to != NULL) free(to);
    if(from != NULL) free(from);
    if(version != NULL) free(version);
 
    return 0;
}

case event_OPEN:
    log_write(c2s->log, LOG_NOTICE, "connection to router established");
 
    /* set connection attempts counter */
    c2s->retry_left = c2s->retry_lost;
 
    nad = nad_new();
    ns = nad_add_namespace(nad, uri_COMPONENT, NULL);
    nad_append_elem(nad, ns, "bind", 0);
    nad_append_attr(nad, -1, "name", c2s->id);
 
    log_debug(ZONE, "requesting component bind for '%s'", c2s->id);
 
    sx_nad_write(c2s->router, nad);
 
    return 0;

#client与server建立链接后发出一个strem头
C:<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' to='example.com' version='1.0'>
#server回应一个steam头
S:<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='c2s_234' from='example.com' version='1.0'>
#server发送自己支持的验证方式列表
S:<stream:features>
     <mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
       <mechanism>DIGEST-MD5</mechanism>
       <mechanism>PLAIN</mechanism>
     </mechanisms>
</stream:features>
#client 说它要用DIGEST-MD5做验证
C:
<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'/>
#server 发送challenge code
S:<challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
   cmVhbG09InNvbWVyZWFsbSIsbm9uY2U9Ik9BNk1HOXRFUUdtMmhoIixxb3A9ImF1dGgi
   LGNoYXJzZXQ9dXRmLTgsYWxnb3JpdGhtPW1kNS1zZXNzCg==
</challenge>
#client 回应challenge
C:
<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>
   dXNlcm5hbWU9InNvbWVub2RlIixyZWFsbT0ic29tZXJlYWxtIixub25jZT0i
   T0E2TUc5dEVRR20yaGgiLGNub25jZT0iT0E2TUhYaDZWcVRyUmsiLG5jPTAw
   MDAwMDAxLHFvcD1hdXRoLGRpZ2VzdC11cmk9InhtcHAvZXhhbXBsZS5jb20i
   LHJlc3BvbnNlPWQzODhkYWQ5MGQ0YmJkNzYwYTE1MjMyMWYyMTQzYWY3LGNo
   YXJzZXQ9dXRmLTgK
   </response>
#server 回应验证结果
S:
<success xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>

Gsasl *ctx = NULL;
char buffer[BUFSIZ] = "";
char *buf;
Gsasl_session *session;
int rc;
char *p;
//使用gsasl之前初始化
if ((rc = gsasl_init (&ctx)) != GSASL_OK)
{
    printf ("Cannot initialize libgsasl (%d): %s",
        rc, gsasl_strerror (rc));
    return;
}
 
//创建一个使用LOGIN验证方式的客户端session
if ((rc = gsasl_client_start (ctx, "LOGIN", &session)) != GSASL_OK)
{
    printf ("Cannot initialize client (%d): %s\n",
       rc, gsasl_strerror (rc));
    return;
}
 
//设置用户名和密码
gsasl_property_set (session, GSASL_AUTHID, "username");
gsasl_property_set (session, GSASL_PASSWORD, "password");
 
//假设socket_fd为我们与server已经建立连接的描述字
 
//告诉server我们选择使用LOGIN做验证
buf = buffer;
sprintf(buf, "AUTH LOGIN\r\n");
write(socket_fd, buf, strlen(buf));
 
do
 {
   buf = buffer;
   //从server读取一行，
   readline(buf, sizeof (buf) - 1, socket_fd);
   //334 是多余的 
   buf += 4;
   //将challenge code 交给gsasl处理
   rc = gsasl_step64 (session, buf, &p);
 
   if (rc == GSASL_NEEDS_MORE || rc == GSASL_OK)
     {
       //将gsasl的处理结果发送给server
       write(socket_fd, p, strlen(p));
       free (p);
     }
 }
while (rc == GSASL_NEEDS_MORE);
 
if (rc != GSASL_OK)
 {
   printf ("Authentication error (%d): %s\n",
           rc, gsasl_strerror (rc));
   return;
 }
 
printf("success!");
 
gsasl_finish (session);
gsasl_done (ctx);

int callback (Gsasl * ctx, Gsasl_session * sctx, Gsasl_property prop)
 {
   char buf[BUFSIZ] = "";
   int rc = GSASL_NO_CALLBACK;
 
   switch (prop)
     {
     case GSASL_AUTHID:
       gsasl_property_set (sctx, GSASL_AUTHID, "username");
       rc = GSASL_OK;
       break;
     // .............. 
     default:
       printf ("Unknown property!  Don't worry.\n");
       break;
     }
 
   return rc;
 }
//.................
gsasl_callback_set (ctx, callback);

#/dev/sdb4是u盘的设备号,因人而异,可用df命令查到
sudo ./mkgrubusb.bin /dev/sdb4

$ echo 中国淫 | ./hz2py 
zhong guo yan|yao|yin

gcc -D HZ2PY_BINARY hz2py.c -o hz2py