bcollet/socat
1
0
Fork 0
mirror of https://repo.or.cz/socat.git synced 2024-12-22 23:42:34 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
socat/xiosocketpair.c
Gerhard Rieger 7467d9b40f Red Hat issue 1022048: strncpy hardening
2014-03-26 12:48:27 +01:00

406 lines
12 KiB
C
Raw Blame History

/* xiosocketpair.c */
/* Copyright Gerhard Rieger */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this is the source of the internal xiosocketpair function */
#include "xiosysincludes.h"
#include "sycls.h"
#include "compat.h"
#include "error.h"
#include "xio.h"
#if defined(HAVE_DEV_PTMX)
# define PTMX "/dev/ptmx" /* Linux */
#elif HAVE_DEV_PTC
# define PTMX "/dev/ptc" /* AIX */
#endif
#define MAXPTYNAMELEN 64
int xiopty(int useptmx, int *ttyfdp, int *ptyfdp) {
int ttyfd, ptyfd = -1;
char ptyname[MAXPTYNAMELEN];
struct termios termarg;
if (useptmx) {
if ((ptyfd = Open(PTMX, O_RDWR|O_NOCTTY, 0620)) < 0) {
Warn1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620): %s",
strerror(errno));
/*!*/
} else {
;/*0 Info1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620) -> %d", ptyfd);*/
}
if (ptyfd >= 0) {
char *tn = NULL;
/* we used PTMX before forking */
/*0 extern char *ptsname(int);*/
#if HAVE_GRANTPT /* AIX, not Linux */
if (Grantpt(ptyfd)/*!*/ < 0) {
Warn2("grantpt(%d): %s", ptyfd, strerror(errno));
}
#endif /* HAVE_GRANTPT */
#if HAVE_UNLOCKPT
if (Unlockpt(ptyfd)/*!*/ < 0) {
Warn2("unlockpt(%d): %s", ptyfd, strerror(errno));
}
#endif /* HAVE_UNLOCKPT */
#if HAVE_PTSNAME /* AIX, not Linux */
if ((tn = Ptsname(ptyfd)) == NULL) {
Warn2("ptsname(%d): %s", ptyfd, strerror(errno));
} else {
Notice1("PTY is %s", tn);
}
#endif /* HAVE_PTSNAME */
#if 0
if (tn == NULL) {
/*! ttyname_r() */
if ((tn = Ttyname(ptyfd)) == NULL) {
Warn2("ttyname(%d): %s", ptyfd, strerror(errno));
}
}
ptyname[0] = '\0'; strncat(ptyname, tn, MAXPTYNAMELEN-1);
#endif
if ((ttyfd = Open(tn, O_RDWR|O_NOCTTY, 0620)) < 0) {
Warn2("open(\"%s\", O_RDWR|O_NOCTTY, 0620): %s", tn, strerror(errno));
} else {
/*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", tn, ttyfd);*/
}
#ifdef I_PUSH
/* Linux: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> -1 EINVAL */
/* AIX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 1 */
/* SunOS: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
/* HP-UX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
if (Ioctl(ttyfd, I_FIND, "ldterm") == 0) {
Ioctl(ttyfd, I_PUSH, "ptem"); /* 0 */
Ioctl(ttyfd, I_PUSH, "ldterm"); /* 0 */
Ioctl(ttyfd, I_PUSH, "ttcompat"); /* HP-UX: -1 */
}
#endif
}
}
#if HAVE_OPENPTY
if (ptyfd < 0) {
int result;
if ((result = Openpty(&ptyfd, &ttyfd, ptyname, NULL, NULL)) < 0) {
Error4("openpty(%p, %p, %p, NULL, NULL): %s",
&ptyfd, &ttyfd, ptyname, strerror(errno));
return -1;
}
Notice1("PTY is %s", ptyname);
}
#endif /* HAVE_OPENPTY */
if (Tcgetattr(ttyfd, &termarg) < 0) {
Error3("tcgetattr(%d, %p): %s",
ttyfd, &termarg, strerror(errno));
}
#if 0
cfmakeraw(&termarg);
#else
/*!!! share code with xioopts.c raw,echo=0 */
termarg.c_iflag &=
~(IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF
#ifdef IUCLC
|IUCLC
#endif
|IXANY|IMAXBEL);
termarg.c_iflag |= (0);
termarg.c_oflag &= ~(OPOST);
termarg.c_oflag |= (0);
termarg.c_cflag &= ~(0);
termarg.c_cflag |= (0);
termarg.c_lflag &= ~(ECHO|ECHONL|ISIG|ICANON
#ifdef XCASE
|XCASE
#endif
);
termarg.c_lflag |= (0);
termarg.c_cc[VMIN] = 1;
termarg.c_cc[VTIME] = 0;
#endif
if (Tcsetattr(ttyfd, TCSADRAIN, &termarg) < 0) {
Error3("tcsetattr(%d, TCSADRAIN, %p): %s",
ttyfd, &termarg, strerror(errno));
}
*ttyfdp = ttyfd;
*ptyfdp = ptyfd;
return 0;
}
/* generates a socket pair; supports not only PF_UNIX but also PF_INET */
int xiosocketpair2(int pf, int socktype, int protocol, int sv[2]) {
int result;
switch (pf) {
struct sockaddr_in ssin, csin, xsin; /* server, client, compare */
socklen_t cslen, xslen;
int sconn, slist, sserv; /* socket FDs */
case PF_UNIX:
result = Socketpair(pf, socktype, protocol, sv);
if (result < 0) {
Error5("socketpair(%d, %d, %d, %p): %s",
pf, socktype, protocol, sv, strerror(errno));
return -1;
}
break;
#if LATER
case PF_INET:
#if 1 /*!!! Linux */
ssin.sin_family = pf;
ssin.sin_port = htons(1024+random()%(65536-1024));
ssin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
#endif /* */
if ((s = Socket(pf, socktype, protocol)) < 0) {
Error4("socket(%d, %d, %d): %s",
pf, socktype, protocol, strerror(errno));
}
if (Bind(s, (struct sockaddr *)&ssin, sizeof(ssin)) < 0) {
Error6("bind(%d, {%u, 0x%x:%u}, "F_Zu"): %s",
s, ssin.sin_family, ssin.sin_addr.s_addr, ssin.sin_port,
sizeof(ssin), strerror(errno));
}
if (Connect(s, (struct sockaddr *)&ssin, sizeof(ssin)) < 0) {
Error6("connect(%d, {%u, 0x%x:%u}, "F_Zu"): %s",
s, ssin.sin_family, ssin.sin_addr.s_addr, ssin.sin_port,
sizeof(ssin), strerror(errno));
return -1;
}
break;
#endif /* LATER */
case PF_INET:
ssin.sin_family = pf;
ssin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if ((slist = Socket(pf, socktype, protocol)) < 0) {
Error4("socket(%d, %d, %d): %s",
pf, socktype, protocol, strerror(errno));
}
while (true) { /* find a port we can bind to */
ssin.sin_port = htons(1024+random()%(65536-1024));
if (Bind(slist, (struct sockaddr *)&ssin, sizeof(ssin)) == 0) break;
if (errno == EADDRINUSE) {
Info6("bind(%d, {%u, 0x%x:%u}, "F_Zu"): %s",
slist, ssin.sin_family, ssin.sin_addr.s_addr,
ntohs(ssin.sin_port), sizeof(ssin), strerror(errno));
continue;
}
Error6("bind(%d, {%u, 0x%x:%u}, "F_Zu"): %s",
slist, ssin.sin_family, ssin.sin_addr.s_addr, ssin.sin_port,
sizeof(ssin), strerror(errno));
Close(slist);
return -1;
}
Listen(slist, 0);
if ((sconn = Socket(pf, socktype, protocol)) < 0) {
Error4("socket(%d, %d, %d): %s",
pf, socktype, protocol, strerror(errno));
Close(slist); return -1;
}
/* for testing race condition: Sleep(30); */
if (Connect(sconn, (struct sockaddr *)&ssin, sizeof(ssin)) < 0) {
Error6("connect(%d, {%u, 0x%x:%u}, "F_Zu"): %s",
sconn, ssin.sin_family, ssin.sin_addr.s_addr,
ntohs(ssin.sin_port),
sizeof(ssin), strerror(errno));
Close(slist); Close(sconn); return -1;
}
cslen = sizeof(csin);
if (Getsockname(sconn, (struct sockaddr *)&csin, &cslen) < 0) {
Error4("getsockname(%d, %p, %p): %s",
sconn, &csin, &cslen, strerror(errno));
Close(slist); Close(sconn); return -1;
}
do {
xslen = sizeof(xsin);
if ((sserv = Accept(slist, (struct sockaddr *)&xsin, &xslen)) < 0) {
Error4("accept(%d, %p, {"F_Zu"}): %s",
slist, &csin, sizeof(xslen), strerror(errno));
Close(slist); Close(sconn); return -1;
}
if (!memcmp(&csin, &xsin, cslen)) {
break; /* expected connection */
}
Warn4("unexpected connection to 0x%lx:%hu from 0x%lx:%hu",
ntohl(ssin.sin_addr.s_addr), ntohs(ssin.sin_port),
ntohl(xsin.sin_addr.s_addr), ntohs(xsin.sin_port));
} while (true);
Close(slist);
sv[0] = sconn;
sv[1] = sserv;
break;
default:
Error1("xiosocketpair2(): pf=%u not implemented", pf);
return -1;
}
return 0;
}
/*
dual should only be != 0 when both directions are used
returns 0 on success
*/
int xiocommpair(int commtype, bool lefttoright, bool righttoleft,
int dual, xiofd_t *left, xiofd_t *right, ...) {
va_list ap;
int domain = -1, socktype = -1, protocol = -1;
int useptmx = 0;
/* arrays can be used with pipe(2) and socketpair(2): */
int svlr[2] = {-1, -1}; /* left to right: rfd, wfd */
int svrl[2] = {-1, -1}; /* right to left: rfd, wfd */
/* get related parameters from parameter list */
switch (commtype) {
case XIOCOMM_SOCKETPAIR:
case XIOCOMM_SOCKETPAIRS:
va_start(ap, right);
domain = va_arg(ap, int);
socktype = va_arg(ap, int);
protocol = va_arg(ap, int);
va_end(ap);
break;
case XIOCOMM_PTY:
case XIOCOMM_PTYS:
va_start(ap, right);
useptmx = va_arg(ap, int);
va_end(ap);
break;
default:
break;
}
switch (commtype) {
default: /* unspec */
Warn1("internal: undefined communication type %d, defaulting to 0",
commtype);
commtype = 0;
/*PASSTHROUGH*/
case XIOCOMM_SOCKETPAIRS: /* two socketpairs - the default */
if (lefttoright) {
if (Socketpair(domain, socktype, protocol, svlr) < 0) {
Error5("socketpair(%d, %d, %d, %p): %s",
domain, socktype, protocol, svlr, strerror(errno));
}
Shutdown(svlr[0], SHUT_WR);
}
if (righttoleft) {
if (Socketpair(domain, socktype, protocol, svrl) < 0) {
Error5("socketpair(%d, %d, %d, %p): %s",
domain, socktype, protocol, svrl, strerror(errno));
}
Shutdown(svrl[0], SHUT_WR);
}
left->single = right->single = false;
left->dtype = right->dtype = XIODATA_STREAM;
left->howtoshut = right->howtoshut = XIOSHUT_DOWN;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
case XIOCOMM_PTYS: /* two ptys in raw mode, EOF in canonical mode */
if (lefttoright) {
if (xiopty(useptmx, &svlr[0], &svlr[1]) < 0) return -1;
/* pty is write side, interpretes ^D in canonical mode */
}
if (righttoleft) {
if (xiopty(useptmx, &svrl[0], &svrl[1]) < 0) return -1;
}
left->single = right->single = false;
left->dtype = right->dtype = XIODATA_PTY;
left->howtoshut = right->howtoshut = XIOSHUT_PTYEOF;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
case XIOCOMM_SOCKETPAIR: /* one socketpair */
if (Socketpair(domain, socktype, protocol, svlr) < 0) {
Error5("socketpair(%d %d %d, %p): %s",
domain, socktype, protocol, svlr, strerror(errno));
return -1;
}
left->single = right->single = true;
left->dtype = right->dtype = XIODATA_STREAM;
left->howtoshut = right->howtoshut = XIOSHUT_DOWN;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
case XIOCOMM_PTY: /* one pty in raw mode, EOF in canonical mode */
if (xiopty(useptmx, &svlr[0], &svlr[1]) < 0) return -1;
left->single = right->single = true;
left->dtype = right->dtype = XIODATA_PTY;
left->howtoshut = XIOSHUT_PTYEOF;
right->howtoshut = XIOSHUT_CLOSE;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
case XIOCOMM_PIPES: /* two pipes */
if (lefttoright) {
if (Pipe(svlr) < 0) {
Error2("pipe(%p): %s", svlr, strerror(errno));
return -1;
}
}
if (righttoleft) {
if (Pipe(svrl) < 0) {
Error2("pipe(%p): %s", svrl, strerror(errno));
return -1;
}
}
left->single = right->single = false;
left->dtype = right->dtype = XIODATA_STREAM;
left->howtoshut = right->howtoshut = XIOSHUT_CLOSE;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
case XIOCOMM_TCP:
case XIOCOMM_TCP4: /* one TCP/IPv4 socket pair */
if (xiosocketpair2(PF_INET, SOCK_STREAM, 0, svlr) < 0) {
Error2("socketpair(PF_UNIX, PF_STREAM, 0, %p): %s",
svlr, strerror(errno));
return -1;
}
left->single = right->single = true;
left->dtype = right->dtype = XIODATA_STREAM;
left->howtoshut = right->howtoshut = XIOSHUT_DOWN;
left->howtoclose = right->howtoclose = XIOCLOSE_CLOSE;
break;
}
if (dual && left->single) {
/* one pair */
/* dual; we use different FDs for the channels to avoid conflicts
(happened in dual exec) */
if ((svrl[1] = Dup(svlr[0])) < 0) {
Error2("dup(%d): %s", svrl[0], strerror(errno));
return -1;
}
if ((svrl[0] = Dup(svlr[1])) < 0) {
Error2("dup(%d): %s", svlr[1], strerror(errno));
return -1;
}
} else if (left->single) {
svrl[1] = svlr[0];
svrl[0] = svlr[1];
}
/* usually they are not to be passed to exec'd child processes */
if (lefttoright) {
Fcntl_l(svlr[0], F_SETFD, 1);
Fcntl_l(svlr[1], F_SETFD, 1);
}
if (righttoleft && (!left->single || dual)) {
Fcntl_l(svrl[0], F_SETFD, 1);
Fcntl_l(svrl[1], F_SETFD, 1);
}
left->rfd = svrl[0];
left->wfd = svlr[1];
right->rfd = svlr[0];
right->wfd = svrl[1];
Notice4("xiocommpair() -> [%d:%d], [%d:%d]",
left->rfd, left->wfd, right->rfd, right->wfd);
return 0;
}
Reference in a new issue View git blame Copy permalink