libpurple/protocols/silc/util.c

/*

  silcpurple_util.c

  Author: Pekka Riikonen <priikone@silcnet.org>

  Copyright (C) 2004 - 2007 Pekka Riikonen

  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; version 2 of the License.

  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.

*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#include <glib/gi18n-lib.h>
#include <glib/gstdio.h>

#include "silcpurple.h"

/**************************** Utility Routines *******************************/

static char str[256], str2[256];

const char *silcpurple_silcdir(void)
{
	const char *hd = purple_home_dir();
	memset(str, 0, sizeof(str));
	g_snprintf(str, sizeof(str) - 1, "%s" G_DIR_SEPARATOR_S ".silc", hd ? hd : "/tmp");
	return (const char *)str;
}

const char *silcpurple_session_file(const char *account)
{
	memset(str2, 0, sizeof(str2));
	g_snprintf(str2, sizeof(str2) - 1, "%s" G_DIR_SEPARATOR_S "%s_session",
		   silcpurple_silcdir(), account);
	return (const char *)str2;
}

gboolean silcpurple_ip_is_private(const char *ip)
{
	if (silc_net_is_ip4(ip)) {
		if (!strncmp(ip, "10.", 3)) {
			return TRUE;
		} else if (!strncmp(ip, "172.", 4) && strlen(ip) > 6) {
			char tmp[3];
			int s;
			memset(tmp, 0, sizeof(tmp));
			strncpy(tmp, ip + 4, 2);
			s = atoi(tmp);
			if (s >= 16 && s <= 31)
				return TRUE;
		} else if (!strncmp(ip, "192.168.", 8)) {
			return TRUE;
		}
	}

	return FALSE;
}

/* A fstat alternative, like g_stat for stat. */
static int
silcpurple_fstat(int fd, GStatBuf *st)
{
	int ret;

	g_return_val_if_fail(st != NULL, -1);

#ifdef _WIN32
	ret = _fstat(fd, st);
#else
	ret = fstat(fd, st);
#endif

	return ret;
}

/* This checks stats for various SILC files and directories. First it
   checks if ~/.silc directory exist and is owned by the correct user. If
   it doesn't exist, it will create the directory. After that it checks if
   user's Public and Private key files exists and creates them if needed. */

gboolean silcpurple_check_silc_dir(PurpleConnection *gc)
{
	char filename[256], file_public_key[256], file_private_key[256];
	char servfilename[256], clientfilename[256], friendsfilename[256];
	char pkd[256], prd[256];
	GStatBuf st;
	struct passwd *pw;
	int fd;

	pw = getpwuid(getuid());
	if (!pw) {
		purple_debug_error("silc", "silc: %s\n", g_strerror(errno));
		return FALSE;
	}

	g_snprintf(filename, sizeof(filename) - 1, "%s", silcpurple_silcdir());
	g_snprintf(servfilename, sizeof(servfilename) - 1, "%s" G_DIR_SEPARATOR_S "serverkeys",
		   silcpurple_silcdir());
	g_snprintf(clientfilename, sizeof(clientfilename) - 1, "%s" G_DIR_SEPARATOR_S "clientkeys",
		   silcpurple_silcdir());
	g_snprintf(friendsfilename, sizeof(friendsfilename) - 1, "%s" G_DIR_SEPARATOR_S "friends",
		   silcpurple_silcdir());

	if (pw->pw_uid != geteuid()) {
		purple_debug_error("silc", "Couldn't create directories due to wrong uid!\n");
		return FALSE;
	}

	/*
	 * Check ~/.silc directory
	 */
	if (g_mkdir(filename, 0755) != 0 && errno != EEXIST) {
		purple_debug_error("silc", "Couldn't create '%s' directory\n", filename);
		return FALSE;
	}

#ifndef _WIN32
	if ((g_stat(filename, &st)) == -1) {
		purple_debug_error("silc", "Couldn't stat '%s' directory, error: %s\n", filename, g_strerror(errno));
		return FALSE;
	} else {
		/* Check the owner of the dir */
		if (st.st_uid != 0 && st.st_uid != pw->pw_uid) {
			purple_debug_error("silc", "You don't seem to own '%s' directory\n",
				filename);
			return FALSE;
		}
	}
#endif

	/*
	 * Check ~./silc/serverkeys directory
	 */
	if (g_mkdir(servfilename, 0755) != 0 && errno != EEXIST) {
		purple_debug_error("silc", "Couldn't create '%s' directory\n", servfilename);
		return FALSE;
	}

	/*
	 * Check ~./silc/clientkeys directory
	 */
	if (g_mkdir(clientfilename, 0755) != 0 && errno != EEXIST) {
		purple_debug_error("silc", "Couldn't create '%s' directory\n", clientfilename);
		return FALSE;
	}

	/*
	 * Check ~./silc/friends directory
	 */
	if (g_mkdir(friendsfilename, 0755) != 0 && errno != EEXIST) {
		purple_debug_error("silc", "Couldn't create '%s' directory\n", friendsfilename);
		return FALSE;
	}

	/*
	 * Check Public and Private keys
	 */
	g_snprintf(pkd, sizeof(pkd), "%s" G_DIR_SEPARATOR_S "public_key.pub", silcpurple_silcdir());
	g_snprintf(prd, sizeof(prd), "%s" G_DIR_SEPARATOR_S "private_key.prv", silcpurple_silcdir());
	g_snprintf(file_public_key, sizeof(file_public_key) - 1, "%s",
		   purple_account_get_string(purple_connection_get_account(gc), "public-key", pkd));
	g_snprintf(file_private_key, sizeof(file_public_key) - 1, "%s",
		   purple_account_get_string(purple_connection_get_account(gc), "private-key", prd));

	if ((g_stat(file_public_key, &st)) == -1) {
		/* If file doesn't exist */
		if (errno == ENOENT) {
			purple_connection_update_progress(gc, _("Creating SILC key pair..."), 1, 5);
			if (!silc_create_key_pair(SILCPURPLE_DEF_PKCS,
						  SILCPURPLE_DEF_PKCS_LEN,
						  file_public_key,
						  file_private_key, NULL,
						  (purple_connection_get_password(gc) == NULL) ? "" : purple_connection_get_password(gc),
						  NULL, NULL, FALSE)) {
				purple_connection_error(gc, PURPLE_CONNECTION_ERROR_OTHER_ERROR,
				                             _("Unable to create SILC key pair"));
				return FALSE;
			}

			if ((g_stat(file_public_key, &st)) == -1) {
				purple_debug_error("silc", "Couldn't stat '%s' public key, error: %s\n",
						   file_public_key, g_strerror(errno));
				return FALSE;
			}
		} else {
			purple_debug_error("silc", "Couldn't stat '%s' public key, error: %s\n",
					   file_public_key, g_strerror(errno));
			return FALSE;
		}
	}

#ifndef _WIN32
	/* Check the owner of the public key */
	if (st.st_uid != 0 && st.st_uid != pw->pw_uid) {
		purple_debug_error("silc", "You don't seem to own your public key!?\n");
		return FALSE;
	}
#endif

	if ((fd = g_open(file_private_key, O_RDONLY, 0)) != -1) {
		if (silcpurple_fstat(fd, &st) == -1) {
			purple_debug_error("silc", "Couldn't stat '%s' private key, error: %s\n",
					   file_private_key, g_strerror(errno));
			close(fd);
			return FALSE;
		}
	} else {
		/* If file doesn't exist */
		if (errno == ENOENT) {
			purple_connection_update_progress(gc, _("Creating SILC key pair..."), 1, 5);
			if (!silc_create_key_pair(SILCPURPLE_DEF_PKCS,
						  SILCPURPLE_DEF_PKCS_LEN,
						  file_public_key,
						  file_private_key, NULL,
						  (purple_connection_get_password(gc) == NULL) ? "" : purple_connection_get_password(gc),
						  NULL, NULL, FALSE)) {
				purple_connection_error(gc, PURPLE_CONNECTION_ERROR_OTHER_ERROR,
				                             _("Unable to create SILC key pair"));
				return FALSE;
			}

			if ((fd = g_open(file_private_key, O_RDONLY, 0)) != -1) {
				if (silcpurple_fstat(fd, &st) == -1) {
					purple_debug_error("silc", "Couldn't stat '%s' private key, error: %s\n",
							   file_private_key, g_strerror(errno));
					close(fd);
					return FALSE;
				}
			} else {
				purple_debug_error("silc", "Couldn't open '%s' "
					"private key, error: %s\n",
					file_private_key, g_strerror(errno));
				return FALSE;
			}
		} else {
			purple_debug_error("silc", "Couldn't open '%s' private key, error: %s\n",
					   file_private_key, g_strerror(errno));
			return FALSE;
		}
	}

#ifndef _WIN32
	/* Check the owner of the private key */
	if (st.st_uid != 0 && st.st_uid != pw->pw_uid) {
		purple_debug_error("silc", "You don't seem to own your private key!?\n");
		if (fd != -1)
			close(fd);
		return FALSE;
	}

	/* Check the permissions for the private key */
	if ((st.st_mode & 0777) != 0600) {
		purple_debug_warning("silc", "Wrong permissions in your private key file `%s'!\n"
			"Trying to change them ...\n", file_private_key);
		if ((fd == -1) || (fchmod(fd, S_IRUSR | S_IWUSR) == -1)) {
			purple_debug_error("silc",
				"Failed to change permissions for private key file!\n"
				"Permissions for your private key file must be 0600.\n");
			if (fd != -1)
				close(fd);
			return FALSE;
		}
		purple_debug_warning("silc", "Done.\n\n");
	}
#endif

	if (fd != -1)
		close(fd);

#ifdef _WIN32
	/* on win32, we calloc pw so pass it to free
	 * (see the getpwuid code below)
	 */
	free(pw);
#endif

	return TRUE;
}

#ifdef _WIN32
struct passwd *getpwuid(uid_t uid) {
	struct passwd *pwd = calloc(1, sizeof(struct passwd));
	return pwd;
}

uid_t getuid() {
	return 0;
}

uid_t geteuid() {
	return 0;
}
#endif

void silcpurple_show_public_key(SilcPurple sg,
				const char *name, SilcPublicKey public_key,
				GCallback callback, void *context)
{
	SilcPublicKeyIdentifier ident;
	SilcSILCPublicKey silc_pubkey;
	char *fingerprint, *babbleprint;
	unsigned char *pk;
	SilcUInt32 pk_len, key_len = 0;
	GString *s;

	/* We support showing only SILC public keys for now */
	if (silc_pkcs_get_type(public_key) != SILC_PKCS_SILC)
	  return;

	silc_pubkey = silc_pkcs_get_context(SILC_PKCS_SILC, public_key);
	ident = &silc_pubkey->identifier;
	key_len = silc_pkcs_public_key_get_len(public_key);

	pk = silc_pkcs_public_key_encode(public_key, &pk_len);
	if (!pk)
	  return;
	fingerprint = silc_hash_fingerprint(NULL, pk, pk_len);
	babbleprint = silc_hash_babbleprint(NULL, pk, pk_len);
	if (!fingerprint || !babbleprint)
	  return;

	s = g_string_new("");
	if (ident->realname)
		/* Hint for translators: Please check the tabulator width here and in
		   the next strings (short strings: 2 tabs, longer strings 1 tab,
		   sum: 3 tabs or 24 characters) */
		g_string_append_printf(s, _("Real Name: \t%s\n"), ident->realname);
	if (ident->username)
		g_string_append_printf(s, _("User Name: \t%s\n"), ident->username);
	if (ident->email)
		g_string_append_printf(s, _("Email: \t\t%s\n"), ident->email);
	if (ident->host)
		g_string_append_printf(s, _("Host Name: \t%s\n"), ident->host);
	if (ident->org)
		g_string_append_printf(s, _("Organization: \t%s\n"), ident->org);
	if (ident->country)
		g_string_append_printf(s, _("Country: \t%s\n"), ident->country);
	g_string_append_printf(s, _("Algorithm: \t%s\n"), silc_pubkey->pkcs->name);
	g_string_append_printf(s, _("Key Length: \t%d bits\n"), (int)key_len);
	if (ident->version)
	  g_string_append_printf(s, _("Version: \t%s\n"), ident->version);
	g_string_append_printf(s, "\n");
	g_string_append_printf(s, _("Public Key Fingerprint:\n%s\n\n"), fingerprint);
	g_string_append_printf(s, _("Public Key Babbleprint:\n%s"), babbleprint);

	purple_request_action(sg->gc, _("Public Key Information"),
			      _("Public Key Information"),
			      s->str, 0, purple_request_cpar_from_connection(sg->gc),
			      context, 1, _("Close"), callback);

	g_string_free(s, TRUE);
	silc_free(fingerprint);
	silc_free(babbleprint);
	silc_free(pk);
}

SilcAttributePayload
silcpurple_get_attr(SilcDList attrs, SilcAttribute attribute)
{
	SilcAttributePayload attr = NULL;

	if (!attrs)
		return NULL;

	silc_dlist_start(attrs);
	while ((attr = silc_dlist_get(attrs)) != SILC_LIST_END)
		if (attribute == silc_attribute_get_attribute(attr))
			break;

	return attr;
}

void silcpurple_get_umode_string(SilcUInt32 mode, char *buf,
				 SilcUInt32 buf_size)
{
	memset(buf, 0, buf_size);
	if ((mode & SILC_UMODE_SERVER_OPERATOR) ||
	    (mode & SILC_UMODE_ROUTER_OPERATOR)) {
		strcat(buf, (mode & SILC_UMODE_SERVER_OPERATOR) ?
		       "[server operator] " :
		       (mode & SILC_UMODE_ROUTER_OPERATOR) ?
		       "[SILC operator] " : "[unknown mode] ");
	}
	if (mode & SILC_UMODE_GONE)
		strcat(buf, "[away] ");
	if (mode & SILC_UMODE_INDISPOSED)
		strcat(buf, "[indisposed] ");
	if (mode & SILC_UMODE_BUSY)
		strcat(buf, "[busy] ");
	if (mode & SILC_UMODE_PAGE)
		strcat(buf, "[wake me up] ");
	if (mode & SILC_UMODE_HYPER)
		strcat(buf, "[hyperactive] ");
	if (mode & SILC_UMODE_ROBOT)
		strcat(buf, "[robot] ");
	if (mode & SILC_UMODE_ANONYMOUS)
		strcat(buf, "[anonymous] ");
	if (mode & SILC_UMODE_BLOCK_PRIVMSG)
		strcat(buf, "[blocks private messages] ");
	if (mode & SILC_UMODE_DETACHED)
		strcat(buf, "[detached] ");
	if (mode & SILC_UMODE_REJECT_WATCHING)
		strcat(buf, "[rejects watching] ");
	if (mode & SILC_UMODE_BLOCK_INVITE)
		strcat(buf, "[blocks invites] ");
	g_strchomp(buf);
}

void silcpurple_get_chmode_string(SilcUInt32 mode, char *buf,
				  SilcUInt32 buf_size)
{
	memset(buf, 0, buf_size);
	if (mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)
		strcat(buf, "[permanent] ");
	if (mode & SILC_CHANNEL_MODE_PRIVATE)
		strcat(buf, "[private] ");
	if (mode & SILC_CHANNEL_MODE_SECRET)
		strcat(buf, "[secret] ");
	if (mode & SILC_CHANNEL_MODE_PRIVKEY)
		strcat(buf, "[private key] ");
	if (mode & SILC_CHANNEL_MODE_INVITE)
		strcat(buf, "[invite only] ");
	if (mode & SILC_CHANNEL_MODE_TOPIC)
		strcat(buf, "[topic restricted] ");
	if (mode & SILC_CHANNEL_MODE_ULIMIT)
		strcat(buf, "[user count limit] ");
	if (mode & SILC_CHANNEL_MODE_PASSPHRASE)
		strcat(buf, "[passphrase auth] ");
	if (mode & SILC_CHANNEL_MODE_CHANNEL_AUTH)
		strcat(buf, "[public key auth] ");
	if (mode & SILC_CHANNEL_MODE_SILENCE_USERS)
		strcat(buf, "[users silenced] ");
	if (mode & SILC_CHANNEL_MODE_SILENCE_OPERS)
		strcat(buf, "[operators silenced] ");
	g_strchomp(buf);
}

void silcpurple_get_chumode_string(SilcUInt32 mode, char *buf,
				 SilcUInt32 buf_size)
{
	memset(buf, 0, buf_size);
	if (mode & SILC_CHANNEL_UMODE_CHANFO)
		strcat(buf, "[founder] ");
	if (mode & SILC_CHANNEL_UMODE_CHANOP)
		strcat(buf, "[operator] ");
	if (mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES)
		strcat(buf, "[blocks messages] ");
	if (mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS)
		strcat(buf, "[blocks user messages] ");
	if (mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS)
		strcat(buf, "[blocks robot messages] ");
	if (mode & SILC_CHANNEL_UMODE_QUIET)
		strcat(buf, "[quieted] ");
	g_strchomp(buf);
}

void
silcpurple_parse_attrs(SilcDList attrs, char **moodstr, char **statusstr,
		       char **contactstr, char **langstr, char **devicestr,
		       char **tzstr, char **geostr)
{
	SilcAttributePayload attr;
	SilcAttributeMood mood = 0;
	SilcAttributeContact contact;
	SilcAttributeObjDevice device;
	SilcAttributeObjGeo geo;

	char tmp[1024];
	GString *s;

	*moodstr = NULL;
	*statusstr = NULL;
	*contactstr = NULL;
	*langstr = NULL;
	*devicestr = NULL;
	*tzstr = NULL;
	*geostr = NULL;

	if (!attrs)
		return;

	s = g_string_new("");
	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_STATUS_MOOD);
	if (attr && silc_attribute_get_object(attr, &mood, sizeof(mood))) {
		if (mood & SILC_ATTRIBUTE_MOOD_HAPPY)
			g_string_append_printf(s, "[%s] ", _("Happy"));
		if (mood & SILC_ATTRIBUTE_MOOD_SAD)
			g_string_append_printf(s, "[%s] ", _("Sad"));
		if (mood & SILC_ATTRIBUTE_MOOD_ANGRY)
			g_string_append_printf(s, "[%s] ", _("Angry"));
		if (mood & SILC_ATTRIBUTE_MOOD_JEALOUS)
			g_string_append_printf(s, "[%s] ", _("Jealous"));
		if (mood & SILC_ATTRIBUTE_MOOD_ASHAMED)
			g_string_append_printf(s, "[%s] ", _("Ashamed"));
		if (mood & SILC_ATTRIBUTE_MOOD_INVINCIBLE)
			g_string_append_printf(s, "[%s] ", _("Invincible"));
		if (mood & SILC_ATTRIBUTE_MOOD_INLOVE)
			g_string_append_printf(s, "[%s] ", _("In Love"));
		if (mood & SILC_ATTRIBUTE_MOOD_SLEEPY)
			g_string_append_printf(s, "[%s] ", _("Sleepy"));
		if (mood & SILC_ATTRIBUTE_MOOD_BORED)
			g_string_append_printf(s, "[%s] ", _("Bored"));
		if (mood & SILC_ATTRIBUTE_MOOD_EXCITED)
			g_string_append_printf(s, "[%s] ", _("Excited"));
		if (mood & SILC_ATTRIBUTE_MOOD_ANXIOUS)
			g_string_append_printf(s, "[%s] ", _("Anxious"));
	}
	if (*s->str != '\0') {
		*moodstr = g_string_free(s, FALSE);
		g_strchomp(*moodstr);
	} else
		g_string_free(s, TRUE);

	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_STATUS_FREETEXT);
	memset(tmp, 0, sizeof(tmp));
	if (attr && silc_attribute_get_object(attr, tmp, sizeof(tmp)))
		*statusstr = g_strdup(tmp);

	s = g_string_new("");
	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_PREFERRED_CONTACT);
	if (attr && silc_attribute_get_object(attr, &contact, sizeof(contact))) {
		if (contact & SILC_ATTRIBUTE_CONTACT_CHAT)
			g_string_append_printf(s, "[%s] ", _("Chat"));
		if (contact & SILC_ATTRIBUTE_CONTACT_EMAIL)
			g_string_append_printf(s, "[%s] ", _("Email"));
		if (contact & SILC_ATTRIBUTE_CONTACT_CALL)
			g_string_append_printf(s, "[%s] ", _("Phone"));
		if (contact & SILC_ATTRIBUTE_CONTACT_PAGE)
			g_string_append_printf(s, "[%s] ", _("Paging"));
		if (contact & SILC_ATTRIBUTE_CONTACT_SMS)
			g_string_append_printf(s, "[%s] ", _("SMS"));
		if (contact & SILC_ATTRIBUTE_CONTACT_MMS)
			g_string_append_printf(s, "[%s] ", _("MMS"));
		if (contact & SILC_ATTRIBUTE_CONTACT_VIDEO)
			g_string_append_printf(s, "[%s] ", _("Video Conferencing"));
	}
	if (*s->str != '\0') {
		*contactstr = g_string_free(s, FALSE);
		g_strchomp(*contactstr);
	} else
		g_string_free(s, TRUE);

	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_PREFERRED_LANGUAGE);
	memset(tmp, 0, sizeof(tmp));
	if (attr && silc_attribute_get_object(attr, tmp, sizeof(tmp)))
		*langstr = g_strdup(tmp);

	s = g_string_new("");
	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_DEVICE_INFO);
	memset(&device, 0, sizeof(device));
	if (attr && silc_attribute_get_object(attr, &device, sizeof(device))) {
		if (device.type == SILC_ATTRIBUTE_DEVICE_COMPUTER)
			g_string_append_printf(s, "%s: ", _("Computer"));
		if (device.type == SILC_ATTRIBUTE_DEVICE_MOBILE_PHONE)
			g_string_append_printf(s, "%s: ", _("Mobile Phone"));
		if (device.type == SILC_ATTRIBUTE_DEVICE_PDA)
			g_string_append_printf(s, "%s: ", _("PDA"));
		if (device.type == SILC_ATTRIBUTE_DEVICE_TERMINAL)
			g_string_append_printf(s, "%s: ", _("Terminal"));
		g_string_append_printf(s, "%s %s %s %s",
				device.manufacturer ? device.manufacturer : "",
				device.version ? device.version : "",
				device.model ? device.model : "",
				device.language ? device.language : "");
	}
	if (*s->str != '\0')
		*devicestr = g_string_free(s, FALSE);
	else
		g_string_free(s, TRUE);

	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_TIMEZONE);
	memset(tmp, 0, sizeof(tmp));
	if (attr && silc_attribute_get_object(attr, tmp, sizeof(tmp)))
		*tzstr = g_strdup(tmp);

	attr = silcpurple_get_attr(attrs, SILC_ATTRIBUTE_GEOLOCATION);
	memset(&geo, 0, sizeof(geo));
	if (attr && silc_attribute_get_object(attr, &geo, sizeof(geo)))
		*geostr = g_strdup_printf("%s %s %s (%s)",
				geo.longitude ? geo.longitude : "",
				geo.latitude ? geo.latitude : "",
				geo.altitude ? geo.altitude : "",
				geo.accuracy ? geo.accuracy : "");
}

/* Checks if message has images, and assembles MIME message if it has.
   If only one image is present, creates simple MIME image message.  If
   there are multiple images and/or text with images multipart MIME
   message is created. */

SilcDList silcpurple_image_message(const char *msg, SilcMessageFlags *mflags)
{
	SilcMime mime = NULL, p;
	SilcDList list, parts = NULL;
	const char *start, *end, *last;
	GData *attribs;
	gboolean images = FALSE;

	last = msg;
	while (last && *last && purple_markup_find_tag("img", last, &start,
						     &end, &attribs)) {
		PurpleImage *image = NULL;
		const gchar *uri;

		/* Check if there is text before image */
		if (start - last) {
			char *text, *tmp;
			p = silc_mime_alloc();

			/* Add content type */
			silc_mime_add_field(p, "Content-Type",
					    "text/plain; charset=utf-8");

			tmp = g_strndup(last, start - last);
			text = purple_unescape_html(tmp);
			g_free(tmp);

			/* Add text */
			silc_mime_add_data(p, (const unsigned char *)text, strlen(text));
			g_free(text);

			if (!parts)
				parts = silc_dlist_init();
			silc_dlist_add(parts, p);
		}

		uri = g_datalist_get_data(&attribs, "src");
		if (uri)
			image = purple_image_store_get_from_uri(uri);
		if (uri) {
			unsigned long imglen = purple_image_get_data_size(image);
			gconstpointer img = purple_image_get_data(image);
			const gchar *type;

			p = silc_mime_alloc();

			/* Add content type */
			type = purple_image_get_mimetype(image);
			if (!type) {
				g_datalist_clear(&attribs);
				last = end + 1;
				continue;
			}
			silc_mime_add_field(p, "Content-Type", type);

			/* Add content transfer encoding */
			silc_mime_add_field(p, "Content-Transfer-Encoding", "binary");

			/* Add image data */
			silc_mime_add_data(p, img, imglen);

			if (!parts)
				parts = silc_dlist_init();
			silc_dlist_add(parts, p);
			images = TRUE;
		}

		g_datalist_clear(&attribs);

		/* Continue after tag */
		last = end + 1;
	}

	/* Check for text after the image(s) */
	if (images && last && *last) {
		char *tmp = purple_unescape_html(last);
		p = silc_mime_alloc();

		/* Add content type */
		silc_mime_add_field(p, "Content-Type",
				    "text/plain; charset=utf-8");

		/* Add text */
		silc_mime_add_data(p, (const unsigned char *)tmp, strlen(tmp));
		g_free(tmp);

		if (!parts)
			parts = silc_dlist_init();
		silc_dlist_add(parts, p);
	}

	/* If there weren't any images, don't return anything. */
	if (!images) {
		if (parts)
			silc_dlist_uninit(parts);
		return NULL;
	}

	if (silc_dlist_count(parts) > 1) {
		/* Multipart MIME message */
		char b[32];
		mime = silc_mime_alloc();
		silc_mime_add_field(mime, "MIME-Version", "1.0");
		g_snprintf(b, sizeof(b), "b%4X%4X",
			   (unsigned int)time(NULL),
			   silc_dlist_count(parts));
		silc_mime_set_multipart(mime, "mixed", b);
		silc_dlist_start(parts);
		while ((p = silc_dlist_get(parts)) != SILC_LIST_END)
			silc_mime_add_multipart(mime, p);
	} else {
		/* Simple MIME message */
		silc_dlist_start(parts);
		mime = silc_dlist_get(parts);
		silc_mime_add_field(mime, "MIME-Version", "1.0");
	}

	*mflags &= ~SILC_MESSAGE_FLAG_UTF8;
	*mflags |= SILC_MESSAGE_FLAG_DATA;

	/* Encode message. Fragment if it is too large */
	list = silc_mime_encode_partial(mime, 0xfc00);

	silc_dlist_uninit(parts);

	/* Added multiparts gets freed here */
	silc_mime_free(mime);

	return list;
}