protocol.c

Linux下的飞鸽传书

/*
 *  Copyright (C) 2006 Takeharu KATO
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

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

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <gnome.h>
#include <glib.h>
#include "common.h"

#define MSG_STRING         "1:%ld:%s:%s:%lu:%s"
#define MSG_GETINFO_STRING "1:%ld:%s:%s:%lu:"
#define MSG_ABSENT_STRING  "1:%ld:%s:%s:%lu:%s[%s]"
#define MSG_STRING_RECVMSG "1:%ld:%s:%s:%lu:%d"
#define MSG_STRING_INFOMSG "1:%ld:%s:%s:%lu:%s"


static long pkt_no=0;

GStaticMutex pktno_mutex = G_STATIC_MUTEX_INIT;

long
ipmsg_get_pkt_no(void) {
  g_static_mutex_lock(&pktno_mutex);
  ++pkt_no;
  g_static_mutex_unlock(&pktno_mutex);
  return (time(NULL)%100000 + pkt_no);
}

static int
construct_message(const char *base,const char *ext,char **msg,size_t *len){
  char *sp;
  char *basep;
  char *extp;
  size_t base_len=0;
  size_t ext_len=0;
  size_t buff_len;
  char *buffer;

  if ( (!msg) || (*msg) || (!len) )
    return -EINVAL;

  base_len=strlen(base)+1;  /*ヌル終端をふくめた長さ */
  if (ext)
    ext_len = strlen(ext)+1;
  buff_len=base_len+ext_len;
  buffer=g_malloc(buff_len);

  if (!buffer) 
    return -ENOMEM;

  sp=basep=buffer;

  strncpy(sp,base,strlen(base)); 
  sp += strlen(base);
  *sp='\0';
  ++sp;
  extp=sp;
  if (ext) {
    strncpy(sp,ext,strlen(ext));
    sp += strlen(ext);
    *sp='\0';
  }
  if (ext)
    dbg_out("Constructed: base:%s ext:%s\n",basep,extp);
  else
    dbg_out("Constructed: base:%s\n",basep);
  *len=buff_len; /* 送信するデータ長を答える */
  *msg=buffer;

  return 0;
}
static int
ipmsg_construct_file_attach_message(const char *msg_string,const char *ext_part,int flags,size_t *len,char **msg,long pktno){
  char base[IPMSG_BUFSIZ];
  char *message;
  size_t msg_len;
  int rc;


  if ( (!msg_string) || (!ext_part) || (!msg) || (!len) )
    return -EINVAL;
  if (!(flags & IPMSG_FILEATTACHOPT))
    return -EINVAL;

  dbg_out("ext:%s\n",ext_part);

  memset(base,0,IPMSG_BUFSIZ);

  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,
	   pktno,
	   hostinfo_refer_user_name(),
	   hostinfo_refer_host_name(),
	   IPMSG_SENDMSG|flags,
	   msg_string);



  message=NULL;
  rc=construct_message(base,ext_part,&message,&msg_len);
  *len=msg_len;
  if (rc<0)
    return rc;

  *msg=message;


  return 0;
}
static int
ipmsg_construct_normal_message(const char *msg_string,int flags,size_t *len,char **msg,long pktno){
  char base[IPMSG_BUFSIZ];
  char *message;
  size_t msg_len;
  int rc;

  if ( (!msg_string) || (!msg) || (!len) )
    return -EINVAL;


  memset(base,0,IPMSG_BUFSIZ);

  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,
	   pktno,
	   hostinfo_refer_user_name(),
	   hostinfo_refer_host_name(),
	   IPMSG_SENDMSG|flags,
	   msg_string);

  message=NULL;
  rc=construct_message(base,NULL,&message,&msg_len);

  if (rc<0)
    return rc;

  *msg=message;
  *len=msg_len;

  return 0;
}
int
ipmsg_construct_getfile_message(unsigned long ftype,const char *msg_string,int flags,size_t *len,char **msg,long pktno){
  char base[IPMSG_BUFSIZ];
  char *message;
  size_t msg_len;
  unsigned long local_flags;
  int rc;

  if ( (!msg_string) || (!msg) || (!len) )
    return -EINVAL;
  
  local_flags=flags;
  local_flags|=((ftype == IPMSG_FILE_DIR)?
		(IPMSG_GETDIRFILES):
		(IPMSG_GETFILEDATA));
  local_flags|=hostinfo_get_normal_send_flags();

  memset(base,0,IPMSG_BUFSIZ);

  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,
	   pktno,
	   hostinfo_refer_user_name(),
	   hostinfo_refer_host_name(),
	   local_flags,
	   msg_string);

  message=NULL;
  rc=construct_message(base,NULL,&message,&msg_len);

  if (rc<0)
    return rc;

  *msg=message;
  *len=msg_len;

  return 0;
}

static int
ipmsg_send_absent_msg(const udp_con_t *con,const int flags){
  char *absent_message=NULL;
  gchar *absent_message_proto=NULL;
  char  *send_string;
  int index;
  size_t len;
  int local_flags;
  int rc;
  char *ipaddr;

  rc=-EINVAL;
  if (!con)
    goto no_need_free_out;

  local_flags=(flags|IPMSG_AUTORETOPT);
  local_flags &= ~(IPMSG_SENDCHECKOPT|IPMSG_ENCRYPTOPT);

  g_assert(!hostinfo_get_absent_id(&index));
  rc=hostinfo_get_absent_message(index,(const char **)&absent_message);
  if (!absent_message)
    goto no_need_free_out;

  convert_string_ipmsg_proto(absent_message,(const gchar **)&absent_message_proto);
  if (!absent_message_proto) 
    goto free_absent_message;

  pkt_no=ipmsg_get_pkt_no();
  rc=ipmsg_construct_normal_message(absent_message_proto,local_flags,&len,&send_string,pkt_no);
  if (rc<0){
    if (send_string)
      goto free_send_string;
  }
  if (!send_string)
    goto free_absent_message;

  ipaddr=(char *)udp_get_peeraddr(con);

  dbg_out("send absent message to %s:%s\n",ipaddr,send_string);

  rc=udp_send_peer(con,send_string,len);
  if (rc<0) {
    rc*=-1;
    ipmsg_err_dialog(_("Can not send message to %s. reason: %s error code = %d"), ipaddr, strerror(rc), rc);
    goto free_send_string;
  }

  logfile_send_log(ipaddr,absent_message);
  rc=0;

free_send_string:
  g_free(send_string);
free_absent_message_proto:
  g_free (absent_message_proto);
free_absent_message:
  g_free(absent_message);
no_need_free_out:
  return rc;
}

int
ipmsg_send_br_isgetlist2(const udp_con_t *con,const int flags){
  char base[IPMSG_BUFSIZ];
  char *msg=NULL;
  size_t len;
  int rc;
  unsigned long local_flags;

  local_flags  = flags;
  local_flags |= hostinfo_get_normal_entry_flags();
  local_flags |= IPMSG_BR_ISGETLIST2;

  memset(base,0,IPMSG_BUFSIZ);
  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,ipmsg_get_pkt_no(),hostinfo_refer_user_name(),hostinfo_refer_host_name(),local_flags,"");

  rc=construct_message(base,NULL,&msg,&len);
  if (rc<0)
    return rc;

  ipmsg_send_broad_cast(con,msg,len);
  g_free(msg);

  return 0;
}

int
ipmsg_send_br_entry(const udp_con_t *con,const int flags){
  char base[IPMSG_BUFSIZ];
  char ext[IPMSG_BUFSIZ];
  char *msg=NULL;
  size_t len;
  int rc;
  unsigned long local_flags;

  if (hostinfo_refer_ipmsg_is_get_hlist())
    ipmsg_send_br_isgetlist2(con,flags);

  local_flags  = flags;
  dbg_out("BR-Entry given Flag :%x\n",local_flags);
  local_flags |= hostinfo_get_normal_entry_flags();
  local_flags |= IPMSG_BR_ENTRY;
  dbg_out("BR-Entry Flag :%x\n",local_flags);
  memset(base,0,IPMSG_BUFSIZ);
  memset(ext,0,IPMSG_BUFSIZ);
  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,ipmsg_get_pkt_no(),hostinfo_refer_user_name(),hostinfo_refer_host_name(),local_flags,hostinfo_refer_nick_name_proto());
  snprintf(ext,IPMSG_BUFSIZ-1,"%s",hostinfo_refer_group_name_proto());
  if (hostinfo_is_ipmsg_absent()) {
    char *absent_title=NULL;
    gchar *absent_title_proto=NULL;
    int index;

    if (!hostinfo_get_absent_id(&index)) {
      hostinfo_get_absent_title(index,(const char **)&absent_title);
      g_assert (absent_title);
      convert_string_ipmsg_proto(absent_title,(const gchar **)&absent_title_proto);
      g_free(absent_title);
      g_assert (absent_title_proto);
      if (absent_title_proto) {
	snprintf(base,IPMSG_BUFSIZ-1,MSG_ABSENT_STRING,ipmsg_get_pkt_no(),hostinfo_refer_user_name(),hostinfo_refer_host_name(),local_flags,hostinfo_refer_nick_name_proto(),absent_title_proto);
	g_free (absent_title_proto);
      }
    }
  }

  rc=construct_message(base,ext,&msg,&len);
  if (rc<0)
    return rc;

  ipmsg_send_broad_cast(con,msg,len);
  g_free(msg);

  return 0;
}

int
ipmsg_send_br_exit(const udp_con_t *con,const int flags){
  char base[IPMSG_BUFSIZ];
  char ext[IPMSG_BUFSIZ];
  char *msg=NULL;
  size_t len;
  int rc;
  unsigned long local_flags;

  local_flags  = flags;
  local_flags |= hostinfo_get_normal_entry_flags();
  local_flags |= IPMSG_BR_EXIT;

  memset(base,0,IPMSG_BUFSIZ);
  memset(ext,0,IPMSG_BUFSIZ);
  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,ipmsg_get_pkt_no(),hostinfo_refer_user_name(),hostinfo_refer_host_name(),local_flags,hostinfo_refer_nick_name_proto());
  snprintf(ext,IPMSG_BUFSIZ-1,"%s",hostinfo_refer_group_name_proto());

  rc=construct_message(base,ext,&msg,&len);
  if (rc<0)
    return rc;

  ipmsg_send_broad_cast(con,msg,len);
  g_free(msg);

  return 0;
}
int
ipmsg_send_br_absence(const udp_con_t *con,const int flags){
  char base[IPMSG_BUFSIZ];
  char ext[IPMSG_BUFSIZ];
  char *msg=NULL;
  size_t len;
  int rc;
  unsigned long local_flags;

  local_flags  = flags;
  local_flags |= hostinfo_get_normal_entry_flags();
  local_flags |= IPMSG_BR_ABSENCE;

  memset(base,0,IPMSG_BUFSIZ);
  memset(ext,0,IPMSG_BUFSIZ);

  snprintf(base,IPMSG_BUFSIZ-1,MSG_STRING,ipmsg_get_pkt_no(),hostinfo_refer_user_name(),hostinfo_refer_host_name(),local_flags,hostinfo_refer_nick_name_proto());
  base[IPMSG_BUFSIZ-1]='\0';

  snprintf(ext,IPMSG_BUFSIZ-1,"%s",hostinfo_refer_group_name_proto());
  ext[IPMSG_BUFSIZ-1]='\0';

  if (hostinfo_is_ipmsg_absent()) {
    char *absent_title=NULL;
    gchar *absent_title_proto=NULL;
    int index;

    if (!hostinfo_get_absent_id(&index)) {
      hostinfo_get_absent_title(index,(const char **)&absent_title);
      g_assert (absent_title);
      convert_string_ipmsg_proto(absent_title,(const gchar **)&absent_title_proto);
      g_free(absent_title);
      g_assert (absent_title_proto);

      if (absent_title_proto) {
	memset(base,0,IPMSG_BUFSIZ);
	snprintf(base,IPMSG_BUFSIZ-1,MSG_ABSENT_STRING,
		 ipmsg_get_pkt_no(),
		 hostinfo_refer_user_name(),
		 hostinfo_refer_host_name(),
		 local_flags,
		 hostinfo_refer_nick_name_proto(),
		 absent_title_proto);
	base[IPMSG_BUFSIZ-1]='\0';
	g_free (absent_title_proto);
      }
    }
  }

  rc=construct_message(base,ext,&msg,&len);
  if (rc<0)
    return rc;

  ipmsg_send_broad_cast(con,msg,len);
  g_free(msg);

  return 0;
}

static int
ipmsg_send_ans_entry_common(const udp_con_t *con, const char *ipaddr, const int flags){
  char base[IPMSG_BUFSIZ];
  char ext[IPMSG_BUFSIZ];