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/*
This file is part of Kismet
Kismet 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.
Kismet 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
along with Kismet; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "tcpclient.h"
TcpClient::TcpClient() {
fprintf(stderr, "*** TcpClient() called with no global registry reference\n");
}
TcpClient::TcpClient(GlobalRegistry *in_globalreg) : NetworkClient(in_globalreg) {
// Nothing special here
}
TcpClient::~TcpClient() {
}
int TcpClient::Connect(const char *in_remotehost, short int in_port,
netcli_connect_cb in_connect_cb, void *in_con_aux) {
int ret;
connect_complete = -1;
connect_cb = in_connect_cb;
connect_aux = in_con_aux;
if ((client_host = gethostbyname(in_remotehost)) == NULL) {
snprintf(errstr, 1024, "TCP client could not resolve host \"%s\"",
in_remotehost);
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
return -1;
}
// This doesn't handle connecting to all the different IPs a name could
// resolve to. Deal with this in the future.
memset(&client_sock, 0, sizeof(client_sock));
client_sock.sin_family = client_host->h_addrtype;
memcpy((char *) &client_sock.sin_addr.s_addr, client_host->h_addr_list[0],
client_host->h_length);
client_sock.sin_port = htons(in_port);
if ((cli_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
snprintf(errstr, 1024, "TCP client socket() call failed: %s",
strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
return -1;
}
// fprintf(stderr, "debug - tcpcli socket() %d\n", cli_fd);
// Make the buffers
read_buf = new RingBuffer(CLI_RING_LEN);
write_buf = new RingBuffer(CLI_RING_LEN);
// Bind local half
memset(&local_sock, 0, sizeof(local_sock));
local_sock.sin_family = AF_INET;
local_sock.sin_addr.s_addr = htonl(INADDR_ANY);
local_sock.sin_port = htons(0);
if (bind(cli_fd, (struct sockaddr *) &local_sock, sizeof(local_sock)) < 0) {
snprintf(errstr, 1024, "TCP client bind() failed: %s", strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
close(cli_fd);
return -1;
}
// Set it to nonblocking
int save_mode = fcntl(cli_fd, F_GETFL, 0);
fcntl(cli_fd, F_SETFL, save_mode | O_NONBLOCK);
// Connect the sockets
if ((ret = connect(cli_fd, (struct sockaddr *) &client_sock,
sizeof(client_sock))) < 0) {
// fprintf(stderr, "debug - connect %d ret %d\n", cli_fd, ret);
if (errno == EINPROGRESS) {
// fprintf(stderr, "debug - %d deferred connect started\n", cli_fd);
// We haven't completed the connection, set our connect_complete to a
// valid value and flag it in write select
connect_complete = 0;
return 0;
} else {
close(cli_fd);
cli_fd = -1;
// Call the connect callback, we failed right off
if (connect_cb != NULL)
(*connect_cb)(globalreg, errno, connect_aux);
return -1;
}
} else {
// fprintf(stderr, "debug - %d connect complete already\n", cli_fd);
connect_complete = 1;
cl_valid = 1;
}
// Call the connect callback, we worked right off
if (connect_cb != NULL)
(*connect_cb)(globalreg, 0, connect_aux);
// fprintf(stderr, "debug - TcpClient connected to %s:%hd %d\n", in_remotehost, in_port, cli_fd);
return 1;
}
// Almost the same code as connect, annoying to have it twice, but sometimes
// we really need a synchronous connect (like for the client initial connect)
int TcpClient::ConnectSync(const char *in_remotehost, short int in_port,
netcli_connect_cb in_connect_cb, void *in_con_aux) {
int ret;
// fprintf(stderr, "debug - tcpclient connect sync\n");
connect_complete = -1;
connect_cb = in_connect_cb;
connect_aux = in_con_aux;
if ((client_host = gethostbyname(in_remotehost)) == NULL) {
snprintf(errstr, 1024, "TCP client could not resolve host \"%s\"",
in_remotehost);
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
return -1;
}
// This doesn't handle connecting to all the different IPs a name could
// resolve to. Deal with this in the future.
memset(&client_sock, 0, sizeof(client_sock));
client_sock.sin_family = client_host->h_addrtype;
memcpy((char *) &client_sock.sin_addr.s_addr, client_host->h_addr_list[0],
client_host->h_length);
client_sock.sin_port = htons(in_port);
if ((cli_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
snprintf(errstr, 1024, "TCP client socket() call failed: %s",
strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
return -1;
}
// fprintf(stderr, "debug - tcpcli socket() %d\n", cli_fd);
// Make the buffers
read_buf = new RingBuffer(CLI_RING_LEN);
write_buf = new RingBuffer(CLI_RING_LEN);
// Bind local half
memset(&local_sock, 0, sizeof(local_sock));
local_sock.sin_family = AF_INET;
local_sock.sin_addr.s_addr = htonl(INADDR_ANY);
local_sock.sin_port = htons(0);
if (bind(cli_fd, (struct sockaddr *) &local_sock, sizeof(local_sock)) < 0) {
snprintf(errstr, 1024, "TCP client bind() failed: %s", strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
close(cli_fd);
return -1;
}
// Connect the sockets
if ((ret = connect(cli_fd, (struct sockaddr *) &client_sock,
sizeof(client_sock))) < 0) {
// fprintf(stderr, "debug - sync connect failed\n");
close(cli_fd);
cli_fd = -1;
// Call the connect callback, we failed right off
if (connect_cb != NULL)
(*connect_cb)(globalreg, errno, connect_aux);
return -1;
}
cl_valid = 1;
// Set it to nonblocking
int save_mode = fcntl(cli_fd, F_GETFL, 0);
fcntl(cli_fd, F_SETFL, save_mode | O_NONBLOCK);
// fprintf(stderr, "debug - sync connect succeeded\n");
// Call the connect callback, we worked right off
if (connect_cb != NULL)
(*connect_cb)(globalreg, 0, connect_aux);
return 1;
}
int TcpClient::ReadBytes() {
uint8_t recv_bytes[1024];
int ret;
// Don't read while we're in connect stage
if (connect_complete == 0)
return 0;
if ((ret = read(cli_fd, recv_bytes, 1024)) < 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
snprintf(errstr, 1024, "TCP client fd %d read() error: %s",
cli_fd, strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
KillConnection();
return -1;
}
if (ret <= 0) {
snprintf(errstr, 1024, "TCP client fd %d socket closed.", cli_fd);
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
KillConnection();
return -1;
}
if (read_buf->InsertData(recv_bytes, ret) == 0) {
snprintf(errstr, 1024, "TCP client fd %d read error, ring buffer full",
cli_fd);
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
KillConnection();
return -1;
}
return ret;
}
int TcpClient::WriteBytes() {
uint8_t dptr[1024];
int dlen, ret;
// Don't write while we're in connect stage
if (connect_complete == 0)
return 0;
write_buf->FetchPtr(dptr, 1024, &dlen);
if (dlen == 0) {
_MSG("TCP client: Client fd " + IntToString(cli_fd) + " got called to "
"write data but has no data pending. Check your RegisterPollable calls.",
MSGFLAG_ERROR);
return 0;
}
// fprintf(stderr, "debug - %d writing %d bytes\n", cli_fd, dlen);
if ((ret = write(cli_fd, dptr, dlen)) <= 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
// if (errno == EINPROGRESS) fprintf(stderr, "debug - %d ... einprog on write? wtf? ret %d\n", cli_fd, ret);
snprintf(errstr, 1024, "TCP client: Killing client fd %d write error %s",
cli_fd, strerror(errno));
globalreg->messagebus->InjectMessage(errstr, MSGFLAG_ERROR);
KillConnection();
return -1;
}
write_buf->MarkRead(ret);
return ret;
}
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