506 lines
12 KiB
C++
506 lines
12 KiB
C++
/*
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** JNetLib
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** Copyright (C) 2008 Cockos Inc
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** Copyright (C) 2000-2001 Nullsoft, Inc.
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** Author: Justin Frankel
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** File: connection.cpp - JNL TCP connection implementation
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** License: see jnetlib.h
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*/
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#include "netinc.h"
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#include "util.h"
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#include "connection.h"
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#include "../wdlcstring.h"
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JNL_Connection::JNL_Connection(JNL_IAsyncDNS *dns, int sendbufsize, int recvbufsize)
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{
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m_errorstr="";
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if (dns == JNL_CONNECTION_AUTODNS)
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{
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m_dns=new JNL_AsyncDNS();
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m_dns_owned=1;
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}
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else
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{
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m_dns=dns;
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m_dns_owned=0;
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}
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m_recv_buffer.Resize(recvbufsize);
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m_send_buffer.Resize(sendbufsize);
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m_socket=INVALID_SOCKET;
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m_remote_port=0;
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m_state=STATE_NOCONNECTION;
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m_localinterfacereq=INADDR_ANY;
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m_recv_len=m_recv_pos=0;
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m_send_len=m_send_pos=0;
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m_host[0]=0;
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m_saddr = new struct sockaddr_in;
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memset(m_saddr,0,sizeof(struct sockaddr_in));
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}
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void JNL_Connection::connect(SOCKET s, struct sockaddr_in *loc)
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{
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close(1);
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m_socket=s;
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m_remote_port=0;
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m_dns=NULL;
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if (loc) *m_saddr=*loc;
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else memset(m_saddr,0,sizeof(struct sockaddr_in));
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if (m_socket != INVALID_SOCKET)
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{
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SET_SOCK_DEFAULTS(m_socket);
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SET_SOCK_BLOCK(m_socket,0);
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m_state=STATE_CONNECTED;
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}
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else
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{
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m_errorstr="invalid socket passed to connect";
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m_state=STATE_ERROR;
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}
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}
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void JNL_Connection::connect(const char *hostname, int port)
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{
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close(1);
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m_remote_port=(short)port;
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m_socket=::socket(AF_INET,SOCK_STREAM,0);
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if (m_socket==INVALID_SOCKET)
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{
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m_errorstr="creating socket";
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m_state=STATE_ERROR;
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}
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else
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{
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if (m_localinterfacereq != INADDR_ANY)
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{
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sockaddr_in sa={0,};
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sa.sin_family=AF_INET;
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sa.sin_addr.s_addr=m_localinterfacereq;
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bind(m_socket,(struct sockaddr *)&sa,16);
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}
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SET_SOCK_DEFAULTS(m_socket);
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SET_SOCK_BLOCK(m_socket,0);
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lstrcpyn_safe(m_host,hostname,sizeof(m_host));
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memset(m_saddr,0,sizeof(struct sockaddr_in));
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if (!m_host[0])
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{
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m_errorstr="empty hostname";
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m_state=STATE_ERROR;
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}
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else
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{
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m_state=STATE_RESOLVING;
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m_saddr->sin_family=AF_INET;
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m_saddr->sin_port=htons((unsigned short)port);
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m_saddr->sin_addr.s_addr=inet_addr(hostname);
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}
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}
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}
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JNL_Connection::~JNL_Connection()
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{
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if (m_socket != INVALID_SOCKET)
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{
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::shutdown(m_socket, SHUT_RDWR);
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::closesocket(m_socket);
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m_socket=INVALID_SOCKET;
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}
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if (m_dns_owned)
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{
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delete m_dns;
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}
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delete m_saddr;
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}
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void JNL_Connection::run(int max_send_bytes, int max_recv_bytes, int *bytes_sent, int *bytes_rcvd)
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{
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int bytes_allowed_to_send=(max_send_bytes<0)?m_send_buffer.GetSize():max_send_bytes;
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int bytes_allowed_to_recv=(max_recv_bytes<0)?m_recv_buffer.GetSize():max_recv_bytes;
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if (bytes_sent) *bytes_sent=0;
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if (bytes_rcvd) *bytes_rcvd=0;
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switch (m_state)
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{
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case STATE_RESOLVING:
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if (m_saddr->sin_addr.s_addr == INADDR_NONE)
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{
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int a=m_dns?m_dns->resolve(m_host,(unsigned int *)&m_saddr->sin_addr.s_addr):-1;
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if (!a) { m_state=STATE_CONNECTING; }
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else if (a == 1)
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{
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m_state=STATE_RESOLVING;
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break;
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}
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else
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{
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m_errorstr="resolving hostname";
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m_state=STATE_ERROR;
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return;
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}
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}
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if (!::connect(m_socket,(struct sockaddr *)m_saddr,16))
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{
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m_state=STATE_CONNECTED;
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}
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else if (JNL_ERRNO!=JNL_EINPROGRESS)
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{
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m_errorstr="connecting to host";
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m_state=STATE_ERROR;
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}
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else { m_state=STATE_CONNECTING; }
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break;
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case STATE_CONNECTING:
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{
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#ifdef _WIN32
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fd_set f[3];
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FD_ZERO(&f[0]);
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FD_ZERO(&f[1]);
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FD_ZERO(&f[2]);
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FD_SET(m_socket,&f[0]);
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FD_SET(m_socket,&f[1]);
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FD_SET(m_socket,&f[2]);
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struct timeval tv;
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memset(&tv,0,sizeof(tv));
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if (select(0,&f[0],&f[1],&f[2],&tv)==-1)
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{
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m_errorstr="connecting to host (calling select())";
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m_state=STATE_ERROR;
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}
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else if (FD_ISSET(m_socket,&f[1]))
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{
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m_state=STATE_CONNECTED;
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}
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else if (FD_ISSET(m_socket,&f[2]))
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{
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m_errorstr="connecting to host";
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m_state=STATE_ERROR;
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}
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#else
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struct pollfd pl = { m_socket, POLLERR|POLLHUP|POLLOUT, 0 };
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int res = poll(&pl,1,0);
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if (res < 0 || (pl.revents & (POLLERR|POLLHUP)))
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{
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m_errorstr="connecting to host";
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m_state=STATE_ERROR;
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}
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else if (res>0 || (pl.revents&POLLOUT))
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m_state=STATE_CONNECTED;
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#endif
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}
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break;
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case STATE_CONNECTED:
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case STATE_CLOSING:
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if (m_send_len>0 && bytes_allowed_to_send>0)
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{
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int len=m_send_buffer.GetSize()-m_send_pos;
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if (len > m_send_len) len=m_send_len;
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if (len > bytes_allowed_to_send) len=bytes_allowed_to_send;
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if (len > 0)
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{
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int res=(int)::send(m_socket,(char*)m_send_buffer.Get()+m_send_pos,len,0);
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if (res==-1 && JNL_ERRNO != JNL_EWOULDBLOCK)
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{
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// m_state=STATE_CLOSED;
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// return;
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}
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if (res>0)
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{
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bytes_allowed_to_send-=res;
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if (bytes_sent) *bytes_sent+=res;
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m_send_pos+=res;
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m_send_len-=res;
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}
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}
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if (m_send_pos>=m_send_buffer.GetSize())
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{
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m_send_pos=0;
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if (m_send_len>0)
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{
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len=m_send_buffer.GetSize()-m_send_pos;
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if (len > m_send_len) len=m_send_len;
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if (len > bytes_allowed_to_send) len=bytes_allowed_to_send;
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int res=(int)::send(m_socket,(char*)m_send_buffer.Get()+m_send_pos,len,0);
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if (res==-1 && JNL_ERRNO != JNL_EWOULDBLOCK)
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{
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// m_state=STATE_CLOSED;
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}
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if (res>0)
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{
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bytes_allowed_to_send-=res;
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if (bytes_sent) *bytes_sent+=res;
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m_send_pos+=res;
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m_send_len-=res;
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}
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}
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}
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}
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if (m_recv_len<m_recv_buffer.GetSize())
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{
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int len=m_recv_buffer.GetSize()-m_recv_pos;
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if (len > m_recv_buffer.GetSize()-m_recv_len) len=m_recv_buffer.GetSize()-m_recv_len;
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if (len > bytes_allowed_to_recv) len=bytes_allowed_to_recv;
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if (len>0)
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{
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int res=(int)::recv(m_socket,(char*)m_recv_buffer.Get()+m_recv_pos,len,0);
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if (res == 0 || (res < 0 && JNL_ERRNO != JNL_EWOULDBLOCK))
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{
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m_state=STATE_CLOSED;
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break;
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}
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if (res > 0)
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{
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bytes_allowed_to_recv-=res;
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if (bytes_rcvd) *bytes_rcvd+=res;
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m_recv_pos+=res;
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m_recv_len+=res;
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}
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}
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if (m_recv_pos >= m_recv_buffer.GetSize())
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{
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m_recv_pos=0;
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if (m_recv_len < m_recv_buffer.GetSize())
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{
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len=m_recv_buffer.GetSize()-m_recv_len;
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if (len > bytes_allowed_to_recv) len=bytes_allowed_to_recv;
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if (len > 0)
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{
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int res=(int)::recv(m_socket,(char*)m_recv_buffer.Get()+m_recv_pos,len,0);
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if (res == 0 || (res < 0 && JNL_ERRNO != JNL_EWOULDBLOCK))
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{
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m_state=STATE_CLOSED;
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break;
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}
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if (res > 0)
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{
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bytes_allowed_to_recv-=res;
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if (bytes_rcvd) *bytes_rcvd+=res;
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m_recv_pos+=res;
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m_recv_len+=res;
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}
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}
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}
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}
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}
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if (m_state == STATE_CLOSING)
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{
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if (m_send_len < 1) m_state = STATE_CLOSED;
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}
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break;
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default: break;
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}
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}
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void JNL_Connection::close(int quick)
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{
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if (quick || m_state == STATE_RESOLVING || m_state == STATE_CONNECTING)
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{
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m_state=STATE_CLOSED;
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if (m_socket != INVALID_SOCKET)
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{
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::shutdown(m_socket, SHUT_RDWR);
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::closesocket(m_socket);
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}
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m_socket=INVALID_SOCKET;
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m_remote_port=0;
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m_recv_len=m_recv_pos=0;
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m_send_len=m_send_pos=0;
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m_host[0]=0;
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memset(m_saddr,0,sizeof(struct sockaddr_in));
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}
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else
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{
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if (m_state == STATE_CONNECTED) m_state=STATE_CLOSING;
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}
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}
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int JNL_Connection::send_bytes_in_queue(void)
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{
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return m_send_len;
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}
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int JNL_Connection::send_bytes_available(void)
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{
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return m_send_buffer.GetSize()-m_send_len;
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}
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int JNL_Connection::send(const void *_data, int length)
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{
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const char *data = static_cast<const char *>(_data);
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if (length > send_bytes_available())
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{
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return -1;
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}
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int write_pos=m_send_pos+m_send_len;
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if (write_pos >= m_send_buffer.GetSize())
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{
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write_pos-=m_send_buffer.GetSize();
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}
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int len=m_send_buffer.GetSize()-write_pos;
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if (len > length)
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{
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len=length;
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}
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memcpy(m_send_buffer.Get()+write_pos,data,len);
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if (length > len)
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{
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memcpy(m_send_buffer.Get(),data+len,length-len);
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}
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m_send_len+=length;
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return 0;
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}
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int JNL_Connection::send_string(const char *line)
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{
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return send(line,(int)strlen(line));
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}
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int JNL_Connection::recv_bytes_available(void)
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{
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return m_recv_len;
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}
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int JNL_Connection::peek_bytes(void *data, int maxlength)
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{
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if (maxlength > m_recv_len)
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{
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maxlength=m_recv_len;
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}
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int read_pos=m_recv_pos-m_recv_len;
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if (read_pos < 0)
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{
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read_pos += m_recv_buffer.GetSize();
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}
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int len=m_recv_buffer.GetSize()-read_pos;
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if (len > maxlength)
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{
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len=maxlength;
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}
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if (data != NULL) {
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memcpy(data,m_recv_buffer.Get()+read_pos,len);
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if (len < maxlength)
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{
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memcpy((char*)data+len,m_recv_buffer.Get(),maxlength-len);
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}
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}
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return maxlength;
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}
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int JNL_Connection::recv_bytes(void *_data, int maxlength)
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{
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char *data = static_cast<char *>(_data);
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int ml=peek_bytes(data,maxlength);
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m_recv_len-=ml;
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return ml;
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}
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int JNL_Connection::getbfromrecv(int pos, int remove)
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{
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int read_pos=m_recv_pos-m_recv_len + pos;
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if (pos < 0 || pos > m_recv_len) return -1;
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if (read_pos < 0)
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{
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read_pos += m_recv_buffer.GetSize();
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}
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if (read_pos >= m_recv_buffer.GetSize())
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{
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read_pos-=m_recv_buffer.GetSize();
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}
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if (remove) m_recv_len--;
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return m_recv_buffer.Get()[read_pos];
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}
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int JNL_Connection::recv_lines_available(void)
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{
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int l=recv_bytes_available();
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int lcount=0;
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int lastch=0;
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int pos;
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for (pos=0; pos < l; pos ++)
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{
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int t=getbfromrecv(pos,0);
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if (t == -1) return lcount;
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if ((t=='\r' || t=='\n') &&(
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(lastch != '\r' && lastch != '\n') || lastch==t
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)) lcount++;
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lastch=t;
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}
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return lcount;
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}
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int JNL_Connection::recv_get_linelen()
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{
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int l = 0;
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while (l < m_recv_len)
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{
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int t=getbfromrecv(l,0);
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if (t<0) return 0;
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if (t == '\r' || t == '\n')
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{
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int r=getbfromrecv(++l,0);
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if ((r == '\r' || r == '\n') && r != t) l++;
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return l;
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}
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l++;
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}
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return 0;
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}
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int JNL_Connection::recv_line(char *line, int maxlength)
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{
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maxlength--; // room for trailing NUL
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if (maxlength > m_recv_len) maxlength=m_recv_len;
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while (maxlength-- > 0)
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{
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int t=getbfromrecv(0,1);
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if (t == -1)
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{
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*line=0;
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return 0;
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}
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if (t == '\r' || t == '\n')
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{
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int r=getbfromrecv(0,0);
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if ((r == '\r' || r == '\n') && r != t) getbfromrecv(0,1);
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*line=0;
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return 0;
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}
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*line++=(char)t;
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}
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*line=0;
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return 1;
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}
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void JNL_Connection::set_interface(int useInterface) // call before connect if needed
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{
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m_localinterfacereq = useInterface;
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}
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unsigned int JNL_Connection::get_interface(void)
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{
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if (m_socket==INVALID_SOCKET) return 0;
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struct sockaddr_in sin;
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memset(&sin,0,sizeof(sin));
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socklen_t len=16;
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if (::getsockname(m_socket,(struct sockaddr *)&sin,&len)) return 0;
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return (unsigned int) sin.sin_addr.s_addr;
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}
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unsigned int JNL_Connection::get_remote()
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{
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return m_saddr->sin_addr.s_addr;
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}
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short JNL_Connection::get_remote_port()
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{
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return m_remote_port;
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}
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