source: protocols/msn/ns.c @ 5fbf815

/********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2012 Wilmer van der Gaast and others                *
  \********************************************************************/

/* MSN module - Notification server callbacks                           */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program 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 General Public License for more details.

  You should have received a copy of the GNU General Public License with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
  Fifth Floor, Boston, MA  02110-1301  USA
*/

#include <ctype.h>
#include <sys/utsname.h>
#include "nogaim.h"
#include "msn.h"
#include "md5.h"
#include "sha1.h"
#include "soap.h"
#include "xmltree.h"

static gboolean msn_ns_connected(gpointer data, gint source, b_input_condition cond);
static gboolean msn_ns_callback(gpointer data, gint source, b_input_condition cond);

static void msn_ns_send_adl_start(struct im_connection *ic);
static void msn_ns_send_adl(struct im_connection *ic);
static void msn_ns_structured_message(struct msn_data *md, char *msg, int msglen, char **cmd);
static void msn_ns_sdg(struct msn_data *md, char *who, char **parts, char *action);
static void msn_ns_nfy(struct msn_data *md, char *who, char **parts, char *action, gboolean is_put);

int msn_ns_write(struct im_connection *ic, int fd, const char *fmt, ...)
{
        struct msn_data *md = ic->proto_data;
        va_list params;
        char *out;
        size_t len;
        int st;

        va_start(params, fmt);
        out = g_strdup_vprintf(fmt, params);
        va_end(params);

        if (fd < 0) {
                fd = md->fd;
        }

        if (getenv("BITLBEE_DEBUG")) {
                fprintf(stderr, "\x1b[91m>>>[NS%d] %s\n\x1b[97m", fd, out);
        }

        len = strlen(out);

        if (md->is_http) {
                st = len;
                msn_gw_write(md->gw, out, len);
        } else {
                st = write(fd, out, len);
        }

        g_free(out);
        if (st != len) {
                imcb_error(ic, "Short write() to main server");
                imc_logout(ic, TRUE);
                return 0;
        }

        return 1;
}

gboolean msn_ns_connect(struct im_connection *ic, const char *host, int port)
{
        struct msn_data *md = ic->proto_data;

        if (md->fd >= 0) {
                closesocket(md->fd);
        }

        if (md->is_http) {
                md->gw = msn_gw_new(md);
                md->gw->callback = msn_ns_callback;
                msn_ns_connected(md, -1, B_EV_IO_READ);
        } else {
                md->fd = proxy_connect(host, port, msn_ns_connected, md);
                if (md->fd < 0) {
                        imcb_error(ic, "Could not connect to server");
                        imc_logout(ic, TRUE);
                        return FALSE;
                }
        }

        return TRUE;
}

static gboolean msn_ns_connected(gpointer data, gint source, b_input_condition cond)
{
        struct msn_data *md = data;
        struct im_connection *ic = md->ic;

        if (source == -1 && !md->is_http) {
                imcb_error(ic, "Could not connect to server");
                imc_logout(ic, TRUE);
                return FALSE;
        }

        g_free(md->rxq);
        md->rxlen = 0;
        md->rxq = g_new0(char, 1);

        if (md->uuid == NULL) {
                struct utsname name;
                sha1_state_t sha[1];

                /* UUID == SHA1("BitlBee" + my hostname + MSN username) */
                sha1_init(sha);
                sha1_append(sha, (void *) "BitlBee", 7);
                if (uname(&name) == 0) {
                        sha1_append(sha, (void *) name.nodename, strlen(name.nodename));
                }
                sha1_append(sha, (void *) ic->acc->user, strlen(ic->acc->user));
                md->uuid = sha1_random_uuid(sha);
                memcpy(md->uuid, "b171be3e", 8);   /* :-P */
        }

        if (msn_ns_write(ic, source, "VER %d %s CVR0\r\n", ++md->trId, MSNP_VER)) {
                if (!md->is_http) {
                        md->inpa = b_input_add(md->fd, B_EV_IO_READ, msn_ns_callback, md);
                }
                imcb_log(ic, "Connected to server, waiting for reply");
        }

        return FALSE;
}

void msn_ns_close(struct msn_data *md)
{
        if (md->gw) {
                if (md->gw->waiting) {
                        /* mark it as closed, let the request callback clean it */
                        md->gw->open = FALSE;
                } else {
                        msn_gw_free(md->gw);
                }
        }
        if (md->fd >= 0) {
                closesocket(md->fd);
                b_event_remove(md->inpa);
        }

        md->fd = md->inpa = -1;
        g_free(md->rxq);
        g_free(md->cmd_text);

        md->rxlen = 0;
        md->rxq = NULL;
        md->cmd_text = NULL;
}

static gboolean msn_ns_callback(gpointer data, gint source, b_input_condition cond)
{
        struct msn_data *md = data;
        struct im_connection *ic = md->ic;
        char *bytes;
        int st;

        if (md->is_http) {
                st = msn_gw_read(md->gw, &bytes);
        } else {
                bytes = g_malloc(1024);
                st = read(md->fd, bytes, 1024);
        }

        if (st <= 0) {
                imcb_error(ic, "Error while reading from server");
                imc_logout(ic, TRUE);
                return FALSE;
        }

        msn_queue_feed(md, bytes, st);

        g_free(bytes);

        /* Ignore ret == 0, it's already disconnected then. */
        msn_handler(md);

        return TRUE;
        
}

int msn_ns_command(struct msn_data *md, char **cmd, int num_parts)
{
        struct im_connection *ic = md->ic;

        if (num_parts == 0) {
                /* Hrrm... Empty command...? Ignore? */
                return(1);
        }

        if (strcmp(cmd[0], "VER") == 0) {
                if (cmd[2] && strncmp(cmd[2], MSNP_VER, 5) != 0) {
                        imcb_error(ic, "Unsupported protocol");
                        imc_logout(ic, FALSE);
                        return(0);
                }

                return(msn_ns_write(ic, md->fd, "CVR %d 0x0409 mac 10.2.0 ppc macmsgs 3.5.1 macmsgs %s VmVyc2lvbjogMQ0KWGZyQ291bnQ6IDINClhmclNlbnRVVENUaW1lOiA2MzU2MTQ3OTU5NzgzOTAwMDANCklzR2VvWGZyOiB0cnVlDQo=\r\n",
                                    ++md->trId, ic->acc->user));
        } else if (strcmp(cmd[0], "CVR") == 0) {
                /* We don't give a damn about the information we just received */
                return msn_ns_write(ic, md->fd, "USR %d SSO I %s\r\n", ++md->trId, ic->acc->user);
        } else if (strcmp(cmd[0], "XFR") == 0) {
                char *server;
                int port;

                if (num_parts >= 6 && strcmp(cmd[2], "NS") == 0) {
                        b_event_remove(md->inpa);
                        md->inpa = -1;

                        server = strchr(cmd[3], ':');
                        if (!server) {
                                imcb_error(ic, "Syntax error");
                                imc_logout(ic, TRUE);
                                return(0);
                        }
                        *server = 0;
                        port = atoi(server + 1);
                        server = cmd[3];

                        imcb_log(ic, "Transferring to other server");
                        return msn_ns_connect(ic, server, port);
                } else {
                        imcb_error(ic, "Syntax error");
                        imc_logout(ic, TRUE);
                        return(0);
                }
        } else if (strcmp(cmd[0], "USR") == 0) {
                if (num_parts >= 6 && strcmp(cmd[2], "SSO") == 0 &&
                    strcmp(cmd[3], "S") == 0) {
                        g_free(md->pp_policy);
                        md->pp_policy = g_strdup(cmd[4]);
                        msn_soap_passport_sso_request(ic, cmd[5]);
                } else if (strcmp(cmd[2], "OK") == 0) {
                        /* If the number after the handle is 0, the e-mail
                           address is unverified, which means we can't change
                           the display name. */
                        if (cmd[4][0] == '0') {
                                md->flags |= MSN_EMAIL_UNVERIFIED;
                        }

                        imcb_log(ic, "Authenticated, getting buddy list");
                        msn_soap_memlist_request(ic);
                } else {
                        imcb_error(ic, "Unknown authentication type");
                        imc_logout(ic, FALSE);
                        return(0);
                }
        } else if (strcmp(cmd[0], "MSG") == 0) {
                if (num_parts < 4) {
                        imcb_error(ic, "Syntax error");
                        imc_logout(ic, TRUE);
                        return(0);
                }

                md->msglen = atoi(cmd[3]);

                if (md->msglen <= 0) {
                        imcb_error(ic, "Syntax error");
                        imc_logout(ic, TRUE);
                        return(0);
                }
        } else if (strcmp(cmd[0], "ADL") == 0) {
                if (num_parts >= 3 && strcmp(cmd[2], "OK") == 0) {
                        msn_ns_send_adl(ic);
                        return msn_ns_finish_login(ic);
                } else if (num_parts >= 3) {
                        md->msglen = atoi(cmd[2]);
                }
        } else if (strcmp(cmd[0], "CHL") == 0) {
                char *resp;
                int st;

                if (num_parts < 3) {
                        imcb_error(ic, "Syntax error");
                        imc_logout(ic, TRUE);
                        return(0);
                }

                resp = msn_p11_challenge(cmd[2]);

                st =  msn_ns_write(ic, -1, "QRY %d %s %zd\r\n%s",
                                   ++md->trId, MSNP11_PROD_ID,
                                   strlen(resp), resp);
                g_free(resp);
                return st;
        } else if (strcmp(cmd[0], "QRY") == 0) {
                /* CONGRATULATIONS */
        } else if (strcmp(cmd[0], "OUT") == 0) {
                int allow_reconnect = TRUE;

                if (cmd[1] && strcmp(cmd[1], "OTH") == 0) {
                        imcb_error(ic, "Someone else logged in with your account");
                        allow_reconnect = FALSE;
                } else if (cmd[1] && strcmp(cmd[1], "SSD") == 0) {
                        imcb_error(ic, "Terminating session because of server shutdown");
                } else {
                        imcb_error(ic, "Session terminated by remote server (%s)",
                                   cmd[1] ? cmd[1] : "reason unknown)");
                }

                imc_logout(ic, allow_reconnect);
                return(0);
        } else if (strcmp(cmd[0], "GCF") == 0) {
                /* Coming up is cmd[2] bytes of stuff we're supposed to
                   censore. Meh. */
                md->msglen = atoi(cmd[2]);
        } else if ((strcmp(cmd[0], "NFY") == 0) || (strcmp(cmd[0], "SDG") == 0)) {
                if (num_parts >= 3) {
                        md->msglen = atoi(cmd[2]);
                }
        } else if (strcmp(cmd[0], "PUT") == 0) {
                if (num_parts >= 4) {
                        md->msglen = atoi(cmd[3]);
                }
        } else if (strcmp(cmd[0], "NOT") == 0) {
                if (num_parts >= 2) {
                        md->msglen = atoi(cmd[1]);
                }
        } else if (strcmp(cmd[0], "QNG") == 0) {
                ic->flags |= OPT_PONGED;
        } else if (g_ascii_isdigit(cmd[0][0])) {
                int num = atoi(cmd[0]);
                const struct msn_status_code *err = msn_status_by_number(num);

                imcb_error(ic, "Error reported by MSN server: %s", err->text);

                if (err->flags & STATUS_FATAL) {
                        imc_logout(ic, TRUE);
                        return(0);
                }

                /* Oh yes, errors can have payloads too now. Discard them for now. */
                if (num_parts >= 3) {
                        md->msglen = atoi(cmd[2]);
                }
        } else {
                imcb_error(ic, "Received unknown command from main server: %s", cmd[0]);
        }

        return(1);
}

int msn_ns_message(struct msn_data *md, char *msg, int msglen, char **cmd, int num_parts)
{
        struct im_connection *ic = md->ic;
        char *body;
        int blen = 0;

        if (!num_parts) {
                return(1);
        }

        if ((body = strstr(msg, "\r\n\r\n"))) {
                body += 4;
                blen = msglen - (body - msg);
        }

        if (strcmp(cmd[0], "MSG") == 0) {
                if (g_strcasecmp(cmd[1], "Hotmail") == 0) {
                        char *ct = get_rfc822_header(msg, "Content-Type:", msglen);

                        if (!ct) {
                                return(1);
                        }

                        if (g_strncasecmp(ct, "application/x-msmsgssystemmessage", 33) == 0) {
                                char *mtype;
                                char *arg1;

                                if (!body) {
                                        return(1);
                                }

                                mtype = get_rfc822_header(body, "Type:", blen);
                                arg1 = get_rfc822_header(body, "Arg1:", blen);

                                if (mtype && strcmp(mtype, "1") == 0) {
                                        if (arg1) {
                                                imcb_log(ic, "The server is going down for maintenance in %s minutes.",
                                                         arg1);
                                        }
                                }

                                g_free(arg1);
                                g_free(mtype);
                        } else if (g_strncasecmp(ct, "text/x-msmsgsprofile", 20) == 0) {
                                /* We don't care about this profile for now... */
                        } else if (g_strncasecmp(ct, "text/x-msmsgsinitialemailnotification", 37) == 0) {
                                if (set_getbool(&ic->acc->set, "mail_notifications")) {
                                        char *inbox = get_rfc822_header(body, "Inbox-Unread:", blen);
                                        char *folders = get_rfc822_header(body, "Folders-Unread:", blen);

                                        if (inbox && folders) {
                                                imcb_log(ic,
                                                         "INBOX contains %s new messages, plus %s messages in other folders.", inbox,
                                                         folders);
                                        }

                                        g_free(inbox);
                                        g_free(folders);
                                }
                        } else if (g_strncasecmp(ct, "text/x-msmsgsemailnotification", 30) == 0) {
                                if (set_getbool(&ic->acc->set, "mail_notifications")) {
                                        char *from = get_rfc822_header(body, "From-Addr:", blen);
                                        char *fromname = get_rfc822_header(body, "From:", blen);

                                        if (from && fromname) {
                                                imcb_log(ic, "Received an e-mail message from %s <%s>.", fromname,
                                                         from);
                                        }

                                        g_free(from);
                                        g_free(fromname);
                                }
                        } else if (g_strncasecmp(ct, "text/x-msmsgsactivemailnotification", 35) == 0) {
                                /* Notification that a message has been read... Ignore it */
                        } else {
                                debug("Can't handle %s packet from notification server", ct);
                        }

                        g_free(ct);
                }
        } else if (strcmp(cmd[0], "ADL") == 0) {
                struct xt_node *adl, *d, *c;

                if (!(adl = xt_from_string(msg, msglen))) {
                        return 1;
                }

                for (d = adl->children; d; d = d->next) {
                        char *dn;
                        if (strcmp(d->name, "d") != 0 ||
                            (dn = xt_find_attr(d, "n")) == NULL) {
                                continue;
                        }
                        for (c = d->children; c; c = c->next) {
                                bee_user_t *bu;
                                struct msn_buddy_data *bd;
                                char *cn, *handle, *f, *l;
                                int flags;

                                if (strcmp(c->name, "c") != 0 ||
                                    (l = xt_find_attr(c, "l")) == NULL ||
                                    (cn = xt_find_attr(c, "n")) == NULL) {
                                        continue;
                                }

                                /* FIXME: Use "t" here, guess I should just add it
                                   as a prefix like elsewhere in the protocol. */
                                handle = g_strdup_printf("%s@%s", cn, dn);
                                if (!((bu = bee_user_by_handle(ic->bee, ic, handle)) ||
                                      (bu = bee_user_new(ic->bee, ic, handle, 0)))) {
                                        g_free(handle);
                                        continue;
                                }
                                g_free(handle);
                                bd = bu->data;

                                if ((f = xt_find_attr(c, "f"))) {
                                        http_decode(f);
                                        imcb_rename_buddy(ic, bu->handle, f);
                                }

                                flags = atoi(l) & 15;
                                if (bd->flags != flags) {
                                        bd->flags = flags;
                                        msn_buddy_ask(bu);
                                }
                        }
                }
        } else if ((strcmp(cmd[0], "SDG") == 0) || (strcmp(cmd[0], "NFY") == 0)) {
                msn_ns_structured_message(md, msg, msglen, cmd);
        }

        return 1;
}

static void msn_ns_structured_message(struct msn_data *md, char *msg, int msglen, char **cmd)
{
        char **parts = NULL;
        char *semicolon = NULL;
        char *action = NULL;
        char *from = NULL;
        char *who = NULL;

        parts = g_strsplit(msg, "\r\n\r\n", 4);

        if (!(from = get_rfc822_header(parts[0], "From", 0))) {
                goto cleanup;
        }

        /* either the semicolon or the end of the string */
        semicolon = strchr(from, ';') ? : (from + strlen(from));

        who = g_strndup(from + 2, semicolon - from - 2);

        if ((strcmp(cmd[0], "SDG") == 0) && (action = get_rfc822_header(parts[2], "Message-Type", 0))) {
                msn_ns_sdg(md, who, parts, action);

        } else if ((strcmp(cmd[0], "NFY") == 0) && (action = get_rfc822_header(parts[2], "Uri", 0))) {
                gboolean is_put = (strcmp(cmd[1], "PUT") == 0);
                msn_ns_nfy(md, who, parts, action, is_put);
        }

cleanup:
        g_strfreev(parts);
        g_free(action);
        g_free(from);
        g_free(who);
}

static void msn_ns_sdg(struct msn_data *md, char *who, char **parts, char *action)
{
        struct im_connection *ic = md->ic;

        if (strcmp(action, "Control/Typing") == 0) {
                imcb_buddy_typing(ic, who, OPT_TYPING);
        } else if (strcmp(action, "Text") == 0) {
                imcb_buddy_msg(ic, who, parts[3], 0, 0);
        }
}

static void msn_ns_nfy(struct msn_data *md, char *who, char **parts, char *action, gboolean is_put)
{
        struct im_connection *ic = md->ic;
        struct xt_node *body = NULL;
        struct xt_node *s = NULL;
        const char *state = NULL;
        char *nick = NULL;
        char *psm = NULL;
        int flags = OPT_LOGGED_IN;

        if (strcmp(action, "/user") != 0) {
                return;
        }

        if (!(body = xt_from_string(parts[3], 0))) {
                goto cleanup;
        }

        s = body->children;
        while ((s = xt_find_node(s, "s"))) {
                struct xt_node *s2;
                char *n = xt_find_attr(s, "n");  /* service name: IM, PE, etc */

                if (strcmp(n, "IM") == 0) {
                        /* IM has basic presence information */
                        if (!is_put) {
                                /* NFY DEL with a <s> usually means log out from the last endpoint */
                                flags &= ~OPT_LOGGED_IN;
                                break;
                        }

                        s2 = xt_find_node(s->children, "Status");
                        if (s2 && s2->text_len) {
                                const struct msn_away_state *msn_state = msn_away_state_by_code(s2->text);
                                state = msn_state->name;
                                if (msn_state != msn_away_state_list) {
                                        flags |= OPT_AWAY;
                                }
                        }
                } else if (strcmp(n, "PE") == 0) {
                        if ((s2 = xt_find_node(s->children, "PSM")) && s2->text_len) {
                                psm = s2->text;
                        }
                        if ((s2 = xt_find_node(s->children, "FriendlyName")) && s2->text_len) {
                                nick = s2->text;
                        }
                }
                s = s->next;
        }

        imcb_buddy_status(ic, who, flags, state, psm);

        if (nick) {
                imcb_rename_buddy(ic, who, nick);
        }

cleanup:
        xt_free_node(body);
}

void msn_auth_got_passport_token(struct im_connection *ic, const char *token, const char *error)
{
        struct msn_data *md;

        /* Dead connection? */
        if (g_slist_find(msn_connections, ic) == NULL) {
                return;
        }

        md = ic->proto_data;

        if (token) {
                msn_ns_write(ic, -1, "USR %d SSO S %s %s {%s}\r\n", ++md->trId, md->tokens[0], token, md->uuid);
        } else {
                imcb_error(ic, "Error during Passport authentication: %s", error);
                imc_logout(ic, TRUE);
        }
}

void msn_auth_got_contact_list(struct im_connection *ic)
{
        /* Dead connection? */
        if (g_slist_find(msn_connections, ic) == NULL) {
                return;
        }

        msn_ns_send_adl_start(ic);
        msn_ns_finish_login(ic);
}

static gboolean msn_ns_send_adl_1(gpointer key, gpointer value, gpointer data)
{
        struct xt_node *adl = data, *d, *c, *s;
        struct bee_user *bu = value;
        struct msn_buddy_data *bd = bu->data;
        struct msn_data *md = bu->ic->proto_data;
        char handle[strlen(bu->handle) + 1];
        char *domain;
        char l[4];

        if ((bd->flags & 7) == 0 || (bd->flags & MSN_BUDDY_ADL_SYNCED)) {
                return FALSE;
        }

        strcpy(handle, bu->handle);
        if ((domain = strchr(handle, '@')) == NULL) {    /* WTF */
                return FALSE;
        }
        *domain = '\0';
        domain++;

        if ((d = adl->children) == NULL ||
            g_strcasecmp(xt_find_attr(d, "n"), domain) != 0) {
                d = xt_new_node("d", NULL, NULL);
                xt_add_attr(d, "n", domain);
                xt_insert_child(adl, d);
        }

        g_snprintf(l, sizeof(l), "%d", bd->flags & 7);
        c = xt_new_node("c", NULL, NULL);
        xt_add_attr(c, "n", handle);
        xt_add_attr(c, "t", "1");   /* FIXME: Network type, i.e. 32 for Y!MSG */
        s = xt_new_node("s", NULL, NULL);
        xt_add_attr(s, "n", "IM");
        xt_add_attr(s, "l", l);
        xt_insert_child(c, s);
        xt_insert_child(d, c);

        /* Do this in batches of 100. */
        bd->flags |= MSN_BUDDY_ADL_SYNCED;
        return (--md->adl_todo % 140) == 0;
}

static void msn_ns_send_adl(struct im_connection *ic)
{
        struct xt_node *adl;
        struct msn_data *md = ic->proto_data;
        char *adls;

        adl = xt_new_node("ml", NULL, NULL);
        xt_add_attr(adl, "l", "1");
        g_tree_foreach(md->domaintree, msn_ns_send_adl_1, adl);
        if (adl->children == NULL) {
                /* This tells the caller that we're done now. */
                md->adl_todo = -1;
                xt_free_node(adl);
                return;
        }

        adls = xt_to_string(adl);
        xt_free_node(adl);
        msn_ns_write(ic, -1, "ADL %d %zd\r\n%s", ++md->trId, strlen(adls), adls);
        g_free(adls);
}

static void msn_ns_send_adl_start(struct im_connection *ic)
{
        struct msn_data *md;
        GSList *l;

        /* Dead connection? */
        if (g_slist_find(msn_connections, ic) == NULL) {
                return;
        }

        md = ic->proto_data;
        md->adl_todo = 0;
        for (l = ic->bee->users; l; l = l->next) {
                bee_user_t *bu = l->data;
                struct msn_buddy_data *bd = bu->data;

                if (bu->ic != ic || (bd->flags & 7) == 0) {
                        continue;
                }

                bd->flags &= ~MSN_BUDDY_ADL_SYNCED;
                md->adl_todo++;
        }

        msn_ns_send_adl(ic);
}

int msn_ns_finish_login(struct im_connection *ic)
{
        struct msn_data *md = ic->proto_data;

        if (ic->flags & OPT_LOGGED_IN) {
                return 1;
        }

        if (md->adl_todo < 0) {
                md->flags |= MSN_DONE_ADL;
        }

        if ((md->flags & MSN_DONE_ADL) && (md->flags & MSN_GOT_PROFILE)) {
                imcb_connected(ic);
        }

        return 1;
}

// TODO: typing notifications, nudges lol, etc
int msn_ns_sendmessage(struct im_connection *ic, bee_user_t *bu, const char *text)
{
        struct msn_data *md = ic->proto_data;
        int retval = 0;
        char *buf;

        if (strncmp(text, "\r\r\r", 3) == 0) {
                /* Err. Shouldn't happen but I guess it can. Don't send others
                   any of the "SHAKE THAT THING" messages. :-D */
                return 1;
        }

        buf = g_strdup_printf(MSN_MESSAGE_HEADERS, bu->handle, ic->acc->user, md->uuid, strlen(text), text);
        retval = msn_ns_write(ic, -1, "SDG %d %zd\r\n%s", ++md->trId, strlen(buf), buf);
        g_free(buf);
        return retval;
}