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socat.c
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socat.c
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/* source: socat.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this is the main source, including command line option parsing, general
control, and the data shuffler */
#include "config.h"
#include "xioconfig.h" /* what features are enabled */
#include "sysincludes.h"
#include "mytypes.h"
#include "compat.h"
#include "error.h"
#include "sycls.h"
#include "sysutils.h"
#include "dalan.h"
#include "filan.h"
#include "xio.h"
#include "xioopts.h"
#include "xiolockfile.h"
/* command line options */
struct {
size_t bufsiz;
bool verbose;
bool verbhex;
struct timeval pollintv; /* with ignoreeof, reread after seconds */
struct timeval closwait; /* after close of x, die after seconds */
struct timeval total_timeout;/* when nothing happens, die after seconds */
bool debug;
bool strictopts; /* stop on errors in address options */
char logopt; /* y..syslog; s..stderr; f..file; m..mixed */
bool lefttoright; /* first addr ro, second addr wo */
bool righttoleft; /* first addr wo, second addr ro */
xiolock_t lock; /* a lock file */
} socat_opts = {
8192, /* bufsiz */
false, /* verbose */
false, /* verbhex */
{1,0}, /* pollintv */
{0,500000}, /* closwait */
{0,0}, /* total_timeout */
0, /* debug */
0, /* strictopts */
's', /* logopt */
false, /* lefttoright */
false, /* righttoleft */
{ NULL, 0 }, /* lock */
};
void socat_usage(FILE *fd);
void socat_opt_hint(FILE *fd, char a, char b);
void socat_version(FILE *fd);
int socat(const char *address1, const char *address2);
int _socat(void);
int cv_newline(unsigned char **buff, ssize_t *bytes, int lineterm1, int lineterm2);
void socat_signal(int sig);
static int socat_sigchild(struct single *file);
void lftocrlf(char **in, ssize_t *len, size_t bufsiz);
void crlftolf(char **in, ssize_t *len, size_t bufsiz);
static int socat_lock(void);
static void socat_unlock(void);
static int socat_newchild(void);
static const char socatversion[] =
#include "./VERSION"
;
static const char timestamp[] = BUILD_DATE;
const char copyright_socat[] = "socat by Gerhard Rieger and contributors - see www.dest-unreach.org";
#if WITH_OPENSSL
const char copyright_openssl[] = "This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)";
const char copyright_ssleay[] = "This product includes software written by Tim Hudson (tjh@cryptsoft.com)";
#endif
bool havelock;
int main(int argc, const char *argv[]) {
const char **arg1, *a;
char *mainwaitstring;
char buff[10];
double rto;
int i, argc0, result;
struct utsname ubuf;
int lockrc;
if (mainwaitstring = getenv("SOCAT_MAIN_WAIT")) {
sleep(atoi(mainwaitstring));
}
diag_set('p', strchr(argv[0], '/') ? strrchr(argv[0], '/')+1 : argv[0]);
/* we must init before applying options because env settings have lower
priority and are to be overridden by options */
if (xioinitialize() != 0) {
Exit(1);
}
xiosetopt('p', "!!");
xiosetopt('o', ":");
argc0 = argc; /* save for later use */
arg1 = argv+1; --argc;
while (arg1[0] && (arg1[0][0] == '-')) {
switch (arg1[0][1]) {
case 'V': if (arg1[0][2]) { socat_usage(stderr); Exit(1); }
socat_version(stdout); Exit(0);
#if WITH_HELP
case '?':
case 'h':
socat_usage(stdout);
xioopenhelp(stdout, (arg1[0][2]=='?'||arg1[0][2]=='h') ? (arg1[0][3]=='?'||arg1[0][3]=='h') ? 2 : 1 : 0);
Exit(0);
#endif /* WITH_HELP */
case 'd':
a = *arg1+1;
while (*a) {
if (*a == 'd') {
diag_set('d', NULL);
} else {
socat_usage(stderr);
Exit(1);
}
++a;
}
break;
#if WITH_FILAN
case 'D': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
socat_opts.debug = true; break;
#endif
case 'l':
switch (arg1[0][2]) {
case 'm': /* mixed mode: stderr, then switch to syslog; + facility */
diag_set('s', NULL);
xiosetopt('l', "m");
socat_opts.logopt = arg1[0][2];
xiosetopt('y', &arg1[0][3]);
break;
case 'y': /* syslog + facility */
diag_set(arg1[0][2], &arg1[0][3]);
break;
case 'f': /* to file, +filename */
case 'p': /* artificial program name */
if (arg1[0][3]) {
diag_set(arg1[0][2], &arg1[0][3]);
} else if (arg1[1]) {
diag_set(arg1[0][2], arg1[1]);
++arg1, --argc;
} else {
Error1("option -l%c requires an argument; use option \"-h\" for help", arg1[0][2]);
}
break;
case 's': /* stderr */
diag_set(arg1[0][2], NULL);
break;
case 'u':
diag_set('u', NULL);
break;
case 'h':
diag_set_int('h', true);
break;
default:
Error1("unknown log option \"%s\"; use option \"-h\" for help", arg1[0]);
break;
}
break;
case 'v': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
socat_opts.verbose = true; break;
case 'x': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
socat_opts.verbhex = true; break;
case 'b': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -b requires an argument; use option \"-h\" for help");
Exit(1);
}
}
socat_opts.bufsiz = strtoul(a, (char **)&a, 0);
break;
case 's': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
diag_set_int('e', E_FATAL); break;
case 't': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -t requires an argument; use option \"-h\" for help");
Exit(1);
}
}
rto = strtod(a, (char **)&a);
socat_opts.closwait.tv_sec = rto;
socat_opts.closwait.tv_usec =
(rto-socat_opts.closwait.tv_sec) * 1000000;
break;
case 'T': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -T requires an argument; use option \"-h\" for help");
Exit(1);
}
}
rto = strtod(a, (char **)&a);
socat_opts.total_timeout.tv_sec = rto;
socat_opts.total_timeout.tv_usec =
(rto-socat_opts.total_timeout.tv_sec) * 1000000;
break;
case 'u': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
socat_opts.lefttoright = true; break;
case 'U': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
socat_opts.righttoleft = true; break;
case 'g': if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
xioopts_ignoregroups = true; break;
case 'L': if (socat_opts.lock.lockfile)
Error("only one -L and -W option allowed");
if (arg1[0][2]) {
socat_opts.lock.lockfile = *arg1+2;
} else {
++arg1, --argc;
if ((socat_opts.lock.lockfile = *arg1) == NULL) {
Error("option -L requires an argument; use option \"-h\" for help");
Exit(1);
}
}
break;
case 'W': if (socat_opts.lock.lockfile)
Error("only one -L and -W option allowed");
if (arg1[0][2]) {
socat_opts.lock.lockfile = *arg1+2;
} else {
++arg1, --argc;
if ((socat_opts.lock.lockfile = *arg1) == NULL) {
Error("option -W requires an argument; use option \"-h\" for help");
Exit(1);
}
}
socat_opts.lock.waitlock = true;
socat_opts.lock.intervall.tv_sec = 1;
socat_opts.lock.intervall.tv_nsec = 0;
break;
#if WITH_IP4 || WITH_IP6
#if WITH_IP4
case '4':
#endif
#if WITH_IP6
case '6':
#endif
if (arg1[0][2]) { socat_opt_hint(stderr, arg1[0][1], arg1[0][2]); Exit(1); }
xioopts.default_ip = arg1[0][1];
xioopts.preferred_ip = arg1[0][1];
break;
#endif /* WITH_IP4 || WITH_IP6 */
case '\0':
case ',':
case ':': break; /* this "-" is a variation of STDIO */
default:
xioinqopt('p', buff, sizeof(buff));
if (arg1[0][1] == buff[0]) {
break;
}
Error1("unknown option \"%s\"; use option \"-h\" for help", arg1[0]);
Exit(1);
}
/* the leading "-" might be a form of the first address */
xioinqopt('p', buff, sizeof(buff));
if (arg1[0][0] == '-' &&
(arg1[0][1] == '\0' || arg1[0][1] == ':' ||
arg1[0][1] == ',' || arg1[0][1] == buff[0]))
break;
++arg1; --argc;
}
if (argc != 2) {
Error1("exactly 2 addresses required (there are %d); use option \"-h\" for help", argc);
Exit(1);
}
if (socat_opts.lefttoright && socat_opts.righttoleft) {
Error("-U and -u must not be combined");
}
xioinitialize2();
Info(copyright_socat);
#if WITH_OPENSSL
Info(copyright_openssl);
Info(copyright_ssleay);
#endif
Debug2("socat version %s on %s", socatversion, timestamp);
xiosetenv("VERSION", socatversion, 1, NULL); /* SOCAT_VERSION */
uname(&ubuf); /* ! here we circumvent internal tracing (Uname) */
Debug4("running on %s version %s, release %s, machine %s\n",
ubuf.sysname, ubuf.version, ubuf.release, ubuf.machine);
#if WITH_MSGLEVEL <= E_DEBUG
for (i = 0; i < argc0; ++i) {
Debug2("argv[%d]: \"%s\"", i, argv[i]);
}
#endif /* WITH_MSGLEVEL <= E_DEBUG */
{
struct sigaction act;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = socat_signal;
/* not sure which signals should be caught and print a message */
Sigaction(SIGHUP, &act, NULL);
Sigaction(SIGINT, &act, NULL);
Sigaction(SIGQUIT, &act, NULL);
Sigaction(SIGILL, &act, NULL);
Sigaction(SIGABRT, &act, NULL);
Sigaction(SIGBUS, &act, NULL);
Sigaction(SIGFPE, &act, NULL);
Sigaction(SIGSEGV, &act, NULL);
Sigaction(SIGTERM, &act, NULL);
}
Signal(SIGPIPE, SIG_IGN);
/* set xio hooks */
xiohook_newchild = &socat_newchild;
if (lockrc = socat_lock()) {
/* =0: goon; >0: locked; <0: error, printed in sub */
if (lockrc > 0)
Error1("could not obtain lock \"%s\"", socat_opts.lock.lockfile);
Exit(1);
}
Atexit(socat_unlock);
result = socat(arg1[0], arg1[1]);
Notice1("exiting with status %d", result);
Exit(result);
return 0; /* not reached, just for gcc -Wall */
}
void socat_usage(FILE *fd) {
fputs(copyright_socat, fd); fputc('\n', fd);
fputs("Usage:\n", fd);
fputs("socat [options] <bi-address> <bi-address>\n", fd);
fputs(" options:\n", fd);
fputs(" -V print version and feature information to stdout, and exit\n", fd);
#if WITH_HELP
fputs(" -h|-? print a help text describing command line options and addresses\n", fd);
fputs(" -hh like -h, plus a list of all common address option names\n", fd);
fputs(" -hhh like -hh, plus a list of all available address option names\n", fd);
#endif /* WITH_HELP */
fputs(" -d[ddd] increase verbosity (use up to 4 times; 2 are recommended)\n", fd);
#if WITH_FILAN
fputs(" -D analyze file descriptors before loop\n", fd);
#endif
fputs(" -ly[facility] log to syslog, using facility (default is daemon)\n", fd);
fputs(" -lf<logfile> log to file\n", fd);
fputs(" -ls log to stderr (default if no other log)\n", fd);
fputs(" -lm[facility] mixed log mode (stderr during initialization, then syslog)\n", fd);
fputs(" -lp<progname> set the program name used for logging\n", fd);
fputs(" -lu use microseconds for logging timestamps\n", fd);
fputs(" -lh add hostname to log messages\n", fd);
fputs(" -v verbose data traffic, text\n", fd);
fputs(" -x verbose data traffic, hexadecimal\n", fd);
fputs(" -b<size_t> set data buffer size (8192)\n", fd);
fputs(" -s sloppy (continue on error)\n", fd);
fputs(" -t<timeout> wait seconds before closing second channel\n", fd);
fputs(" -T<timeout> total inactivity timeout in seconds\n", fd);
fputs(" -u unidirectional mode (left to right)\n", fd);
fputs(" -U unidirectional mode (right to left)\n", fd);
fputs(" -g do not check option groups\n", fd);
fputs(" -L <lockfile> try to obtain lock, or fail\n", fd);
fputs(" -W <lockfile> try to obtain lock, or wait\n", fd);
#if WITH_IP4
fputs(" -4 prefer IPv4 if version is not explicitly specified\n", fd);
#endif
#if WITH_IP6
fputs(" -6 prefer IPv6 if version is not explicitly specified\n", fd);
#endif
}
void socat_opt_hint(FILE *fd, char a, char b) {
fprintf(fd, "Do not merge single character options, i.e. use \"-%c -%c\" instead of \"-%c%c\"\n",
a, b, a, b);
}
void socat_version(FILE *fd) {
struct utsname ubuf;
fputs(copyright_socat, fd); fputc('\n', fd);
fprintf(fd, "socat version %s on %s\n", socatversion, timestamp);
Uname(&ubuf);
fprintf(fd, " running on %s version %s, release %s, machine %s\n",
ubuf.sysname, ubuf.version, ubuf.release, ubuf.machine);
fputs("features:\n", fd);
#ifdef WITH_STDIO
fprintf(fd, " #define WITH_STDIO %d\n", WITH_STDIO);
#else
fputs(" #undef WITH_STDIO\n", fd);
#endif
#ifdef WITH_FDNUM
fprintf(fd, " #define WITH_FDNUM %d\n", WITH_FDNUM);
#else
fputs(" #undef WITH_FDNUM\n", fd);
#endif
#ifdef WITH_FILE
fprintf(fd, " #define WITH_FILE %d\n", WITH_FILE);
#else
fputs(" #undef WITH_FILE\n", fd);
#endif
#ifdef WITH_CREAT
fprintf(fd, " #define WITH_CREAT %d\n", WITH_CREAT);
#else
fputs(" #undef WITH_CREAT\n", fd);
#endif
#ifdef WITH_GOPEN
fprintf(fd, " #define WITH_GOPEN %d\n", WITH_GOPEN);
#else
fputs(" #undef WITH_GOPEN\n", fd);
#endif
#ifdef WITH_TERMIOS
fprintf(fd, " #define WITH_TERMIOS %d\n", WITH_TERMIOS);
#else
fputs(" #undef WITH_TERMIOS\n", fd);
#endif
#ifdef WITH_PIPE
fprintf(fd, " #define WITH_PIPE %d\n", WITH_PIPE);
#else
fputs(" #undef WITH_PIPE\n", fd);
#endif
#ifdef WITH_UNIX
fprintf(fd, " #define WITH_UNIX %d\n", WITH_UNIX);
#else
fputs(" #undef WITH_UNIX\n", fd);
#endif /* WITH_UNIX */
#ifdef WITH_ABSTRACT_UNIXSOCKET
fprintf(fd, " #define WITH_ABSTRACT_UNIXSOCKET %d\n", WITH_ABSTRACT_UNIXSOCKET);
#else
fputs(" #undef WITH_ABSTRACT_UNIXSOCKET\n", fd);
#endif /* WITH_ABSTRACT_UNIXSOCKET */
#ifdef WITH_IP4
fprintf(fd, " #define WITH_IP4 %d\n", WITH_IP4);
#else
fputs(" #undef WITH_IP4\n", fd);
#endif
#ifdef WITH_IP6
fprintf(fd, " #define WITH_IP6 %d\n", WITH_IP6);
#else
fputs(" #undef WITH_IP6\n", fd);
#endif
#ifdef WITH_RAWIP
fprintf(fd, " #define WITH_RAWIP %d\n", WITH_RAWIP);
#else
fputs(" #undef WITH_RAWIP\n", fd);
#endif
#ifdef WITH_GENERICSOCKET
fprintf(fd, " #define WITH_GENERICSOCKET %d\n", WITH_GENERICSOCKET);
#else
fputs(" #undef WITH_GENERICSOCKET\n", fd);
#endif
#ifdef WITH_INTERFACE
fprintf(fd, " #define WITH_INTERFACE %d\n", WITH_INTERFACE);
#else
fputs(" #undef WITH_INTERFACE\n", fd);
#endif
#ifdef WITH_TCP
fprintf(fd, " #define WITH_TCP %d\n", WITH_TCP);
#else
fputs(" #undef WITH_TCP\n", fd);
#endif
#ifdef WITH_UDP
fprintf(fd, " #define WITH_UDP %d\n", WITH_UDP);
#else
fputs(" #undef WITH_UDP\n", fd);
#endif
#ifdef WITH_SCTP
fprintf(fd, " #define WITH_SCTP %d\n", WITH_SCTP);
#else
fputs(" #undef WITH_SCTP\n", fd);
#endif
#ifdef WITH_LISTEN
fprintf(fd, " #define WITH_LISTEN %d\n", WITH_LISTEN);
#else
fputs(" #undef WITH_LISTEN\n", fd);
#endif
#ifdef WITH_SOCKS4
fprintf(fd, " #define WITH_SOCKS4 %d\n", WITH_SOCKS4);
#else
fputs(" #undef WITH_SOCKS4\n", fd);
#endif
#ifdef WITH_SOCKS4A
fprintf(fd, " #define WITH_SOCKS4A %d\n", WITH_SOCKS4A);
#else
fputs(" #undef WITH_SOCKS4A\n", fd);
#endif
#ifdef WITH_VSOCK
fprintf(fd, " #define WITH_VSOCK %d\n", WITH_VSOCK);
#else
fputs(" #undef WITH_VSOCK\n", fd);
#endif
#ifdef WITH_PROXY
fprintf(fd, " #define WITH_PROXY %d\n", WITH_PROXY);
#else
fputs(" #undef WITH_PROXY\n", fd);
#endif
#ifdef WITH_SYSTEM
fprintf(fd, " #define WITH_SYSTEM %d\n", WITH_SYSTEM);
#else
fputs(" #undef WITH_SYSTEM\n", fd);
#endif
#ifdef WITH_EXEC
fprintf(fd, " #define WITH_EXEC %d\n", WITH_EXEC);
#else
fputs(" #undef WITH_EXEC\n", fd);
#endif
#ifdef WITH_READLINE
fprintf(fd, " #define WITH_READLINE %d\n", WITH_READLINE);
#else
fputs(" #undef WITH_READLINE\n", fd);
#endif
#ifdef WITH_TUN
fprintf(fd, " #define WITH_TUN %d\n", WITH_TUN);
#else
fputs(" #undef WITH_TUN\n", fd);
#endif
#ifdef WITH_PTY
fprintf(fd, " #define WITH_PTY %d\n", WITH_PTY);
#else
fputs(" #undef WITH_PTY\n", fd);
#endif
#ifdef WITH_OPENSSL
fprintf(fd, " #define WITH_OPENSSL %d\n", WITH_OPENSSL);
#else
fputs(" #undef WITH_OPENSSL\n", fd);
#endif
#ifdef WITH_FIPS
fprintf(fd, " #define WITH_FIPS %d\n", WITH_FIPS);
#else
fputs(" #undef WITH_FIPS\n", fd);
#endif
#ifdef WITH_LIBWRAP
fprintf(fd, " #define WITH_LIBWRAP %d\n", WITH_LIBWRAP);
#else
fputs(" #undef WITH_LIBWRAP\n", fd);
#endif
#ifdef WITH_SYCLS
fprintf(fd, " #define WITH_SYCLS %d\n", WITH_SYCLS);
#else
fputs(" #undef WITH_SYCLS\n", fd);
#endif
#ifdef WITH_FILAN
fprintf(fd, " #define WITH_FILAN %d\n", WITH_FILAN);
#else
fputs(" #undef WITH_FILAN\n", fd);
#endif
#ifdef WITH_RETRY
fprintf(fd, " #define WITH_RETRY %d\n", WITH_RETRY);
#else
fputs(" #undef WITH_RETRY\n", fd);
#endif
#ifdef WITH_MSGLEVEL
fprintf(fd, " #define WITH_MSGLEVEL %d /*%s*/\n", WITH_MSGLEVEL,
&"debug\0\0\0info\0\0\0\0notice\0\0warn\0\0\0\0error\0\0\0fatal\0\0\0"[WITH_MSGLEVEL<<3]);
#else
fputs(" #undef WITH_MSGLEVEL\n", fd);
#endif
}
xiofile_t *sock1, *sock2;
int closing = 0; /* 0..no eof yet, 1..first eof just occurred,
2..counting down closing timeout */
/* call this function when the common command line options are parsed, and the
addresses are extracted (but not resolved). */
int socat(const char *address1, const char *address2) {
int mayexec;
if (socat_opts.lefttoright) {
if ((sock1 = xioopen(address1, XIO_RDONLY|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
} else if (socat_opts.righttoleft) {
if ((sock1 = xioopen(address1, XIO_WRONLY|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
} else {
if ((sock1 = xioopen(address1, XIO_RDWR|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
}
#if 1 /*! */
if (XIO_READABLE(sock1) &&
(XIO_RDSTREAM(sock1)->howtoend == END_KILL ||
XIO_RDSTREAM(sock1)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(sock1)->howtoend == END_SHUTDOWN_KILL)) {
if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown1) {
/* child has alread died... but it might have put regular data into
the communication channel, so continue */
Info1("child "F_pid" has already died (diedunknown1)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown1 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
/* return STAT_RETRYLATER; */
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown2) {
Info1("child "F_pid" has already died (diedunknown2)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown2 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown3) {
Info1("child "F_pid" has already died (diedunknown3)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown3 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown4) {
Info1("child "F_pid" has already died (diedunknown4)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown4 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
}
}
#endif
mayexec = (sock1->common.flags&XIO_DOESCONVERT ? 0 : XIO_MAYEXEC);
if (XIO_WRITABLE(sock1)) {
if (XIO_READABLE(sock1)) {
if ((sock2 = xioopen(address2, XIO_RDWR|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
} else {
if ((sock2 = xioopen(address2, XIO_RDONLY|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
}
} else { /* assuming sock1 is readable */
if ((sock2 = xioopen(address2, XIO_WRONLY|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
}
#if 1 /*! */
if (XIO_READABLE(sock2) &&
(XIO_RDSTREAM(sock2)->howtoend == END_KILL ||
XIO_RDSTREAM(sock2)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(sock2)->howtoend == END_SHUTDOWN_KILL)) {
if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown1) {
/* child has alread died... but it might have put regular data into
the communication channel, so continue */
Info1("child "F_pid" has already died (diedunknown1)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown1 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
/* return STAT_RETRYLATER; */
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown2) {
Info1("child "F_pid" has already died (diedunknown2)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown2 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown3) {
Info1("child "F_pid" has already died (diedunknown3)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown3 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown4) {
Info1("child "F_pid" has already died (diedunknown4)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown4 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
}
}
#endif
Info("resolved and opened all sock addresses");
return
_socat(); /* nsocks, sockets are visible outside function */
}
/* checks if this is a connection to a child process, and if so, sees if the
child already died, leaving some data for us.
returns <0 if an error occurred;
returns 0 if no child or not yet died or died without data (sets eof);
returns >0 if child died and left data
*/
int childleftdata(xiofile_t *xfd) {
struct pollfd in;
int retval;
/* have to check if a child process died before, but left read data */
if (XIO_READABLE(xfd) &&
(XIO_RDSTREAM(xfd)->howtoend == END_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_SHUTDOWN_KILL) &&
XIO_RDSTREAM(xfd)->para.exec.pid == 0) {
struct timeval timeout = { 0, 0 };
if (XIO_READABLE(xfd) && !(XIO_RDSTREAM(xfd)->eof >= 2 && !XIO_RDSTREAM(xfd)->ignoreeof)) {
in.fd = XIO_GETRDFD(xfd);
in.events = POLLIN/*|POLLRDBAND*/;
in.revents = 0;
}
do {
int _errno;
retval = xiopoll(&in, 1, &timeout);
_errno = errno; diag_flush(); errno = _errno; /* just in case it's not debug level and Msg() not been called */
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
Error5("xiopoll({%d,%0o}, 1, {"F_tv_sec"."F_tv_usec"}): %s",
in.fd, in.events, timeout.tv_sec, timeout.tv_usec,
strerror(errno));
return -1;
}
if (retval == 0) {
Info("terminated child did not leave data for us");
XIO_RDSTREAM(xfd)->eof = 2;
xfd->stream.eof = 2;
closing = MAX(closing, 1);
}
}
return 0;
}
int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
unsigned char **buff, size_t bufsiz, bool righttoleft);
bool mayrd1; /* sock1 has read data or eof, according to poll() */
bool mayrd2; /* sock2 has read data or eof, according to poll() */
bool maywr1; /* sock1 can be written to, according to poll() */
bool maywr2; /* sock2 can be written to, according to poll() */
/* here we come when the sockets are opened (in the meaning of C language),
and their options are set/applied
returns -1 on error or 0 on success */
int _socat(void) {
struct pollfd fds[4],
*fd1in = &fds[0],
*fd1out = &fds[1],
*fd2in = &fds[2],
*fd2out = &fds[3];
int retval;
unsigned char *buff;
ssize_t bytes1, bytes2;
int polling = 0; /* handling ignoreeof */
int wasaction = 1; /* last poll was active, do NOT sleep before next */
struct timeval total_timeout; /* the actual total timeout timer */
#if WITH_FILAN
if (socat_opts.debug) {
int fdi, fdo;
int msglevel, exitlevel;
msglevel = diag_get_int('D'); /* save current message level */
diag_set_int('D', E_ERROR); /* only print errors and fatals in filan */
exitlevel = diag_get_int('e'); /* save current exit level */
diag_set_int('e', E_FATAL); /* only exit on fatals */
fdi = XIO_GETRDFD(sock1);
fdo = XIO_GETWRFD(sock1);
filan_fd(fdi, stderr);
if (fdo != fdi) {
filan_fd(fdo, stderr);
}
fdi = XIO_GETRDFD(sock2);
fdo = XIO_GETWRFD(sock2);
filan_fd(fdi, stderr);
if (fdo != fdi) {
filan_fd(fdo, stderr);
}
diag_set_int('e', exitlevel); /* restore old exit level */
diag_set_int('D', msglevel); /* restore old message level */
}
#endif /* WITH_FILAN */
/* when converting nl to crnl, size might double */
buff = Malloc(2*socat_opts.bufsiz+1);
if (buff == NULL) return -1;
if (socat_opts.logopt == 'm' && xioinqopt('l', NULL, 0) == 'm') {
Info("switching to syslog");
diag_set('y', xioopts.syslogfac);
xiosetopt('l', "\0");
}
total_timeout = socat_opts.total_timeout;
Notice4("starting data transfer loop with FDs [%d,%d] and [%d,%d]",
XIO_GETRDFD(sock1), XIO_GETWRFD(sock1),
XIO_GETRDFD(sock2), XIO_GETWRFD(sock2));
while (XIO_RDSTREAM(sock1)->eof <= 1 ||
XIO_RDSTREAM(sock2)->eof <= 1) {
struct timeval timeout, *to = NULL;
Debug6("data loop: sock1->eof=%d, sock2->eof=%d, closing=%d, wasaction=%d, total_to={"F_tv_sec"."F_tv_usec"}",
XIO_RDSTREAM(sock1)->eof, XIO_RDSTREAM(sock2)->eof,
closing, wasaction,
total_timeout.tv_sec, total_timeout.tv_usec);
/* for ignoreeof */
if (polling) {
if (!wasaction) {
if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
if (total_timeout.tv_usec < socat_opts.pollintv.tv_usec) {
total_timeout.tv_usec += 1000000;
total_timeout.tv_sec -= 1;
}
total_timeout.tv_sec -= socat_opts.pollintv.tv_sec;
total_timeout.tv_usec -= socat_opts.pollintv.tv_usec;
if (total_timeout.tv_sec < 0 ||
total_timeout.tv_sec == 0 && total_timeout.tv_usec < 0) {
Notice("inactivity timeout triggered");
free(buff);
return 0;
}
}
} else {
wasaction = 0;
}
}
if (polling) {
/* there is a ignoreeof poll timeout, use it */
timeout = socat_opts.pollintv;
to = &timeout;
} else if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
/* there might occur a total inactivity timeout */
timeout = socat_opts.total_timeout;
to = &timeout;
} else {
to = NULL;
}
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.pollintv;
to = &timeout;
closing = 2;
}
/* frame 1: set the poll parameters and loop over poll() EINTR) */
do { /* loop over poll() EINTR */
int _errno;
childleftdata(sock1);
childleftdata(sock2);
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.closwait;
to = &timeout;
closing = 2;
}
/* use the ignoreeof timeout if appropriate */
if (polling) {
if (closing == 0 ||
(socat_opts.pollintv.tv_sec < timeout.tv_sec) ||
((socat_opts.pollintv.tv_sec == timeout.tv_sec) &&
socat_opts.pollintv.tv_usec < timeout.tv_usec)) {
timeout = socat_opts.pollintv;
}
}
/* now the fds will be assigned */
if (XIO_READABLE(sock1) &&
!(XIO_RDSTREAM(sock1)->eof > 1 && !XIO_RDSTREAM(sock1)->ignoreeof) &&
!socat_opts.righttoleft) {
if (!mayrd1 && !(XIO_RDSTREAM(sock1)->eof > 1)) {
fd1in->fd = XIO_GETRDFD(sock1);
fd1in->events = POLLIN;
} else {
fd1in->fd = -1;
}
if (!maywr2) {
fd2out->fd = XIO_GETWRFD(sock2);
fd2out->events = POLLOUT;
} else {
fd2out->fd = -1;
}
} else {
fd1in->fd = -1;
fd2out->fd = -1;
}
if (XIO_READABLE(sock2) &&
!(XIO_RDSTREAM(sock2)->eof > 1 && !XIO_RDSTREAM(sock2)->ignoreeof) &&
!socat_opts.lefttoright) {
if (!mayrd2 && !(XIO_RDSTREAM(sock2)->eof > 1)) {
fd2in->fd = XIO_GETRDFD(sock2);
fd2in->events = POLLIN;
} else {
fd2in->fd = -1;
}
if (!maywr1) {
fd1out->fd = XIO_GETWRFD(sock1);
fd1out->events = POLLOUT;
} else {
fd1out->fd = -1;
}
} else {
fd1out->fd = -1;
fd2in->fd = -1;
}
/* frame 0: innermost part of the transfer loop: check FD status */
retval = xiopoll(fds, 4, to);
if (retval >= 0 || errno != EINTR) {
break;
}
_errno = errno;
Info1("poll(): %s", strerror(errno));
errno = _errno;
} while (true);
/* attention:
when an exec'd process sends data and terminates, it is unpredictable
whether the data or the sigchild arrives first.
*/
if (retval < 0) {
Error11("xiopoll({%d,%0o}{%d,%0o}{%d,%0o}{%d,%0o}, 4, {"F_tv_sec"."F_tv_usec"}): %s",
fds[0].fd, fds[0].events, fds[1].fd, fds[1].events,
fds[2].fd, fds[2].events, fds[3].fd, fds[3].events,
timeout.tv_sec, timeout.tv_usec, strerror(errno));
free(buff);
return -1;
} else if (retval == 0) {
Info2("poll timed out (no data within %ld.%06ld seconds)",
closing>=1?socat_opts.closwait.tv_sec:socat_opts.total_timeout.tv_sec,
closing>=1?socat_opts.closwait.tv_usec:socat_opts.total_timeout.tv_usec);
if (polling && !wasaction) {
/* there was a ignoreeof poll timeout, use it */
polling = 0; /*%%%*/
if (XIO_RDSTREAM(sock1)->ignoreeof) {
mayrd1 = 0;
}
if (XIO_RDSTREAM(sock2)->ignoreeof) {
mayrd2 = 0;
}
} else if (polling && wasaction) {
wasaction = 0;
} else if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
/* there was a total inactivity timeout */
Notice("inactivity timeout triggered");
free(buff);
return 0;
}
if (closing) {
break;
}
/* one possibility to come here is ignoreeof on some fd, but no EOF
and no data on any descriptor - this is no indication for end! */
continue;
}
if (XIO_READABLE(sock1) && XIO_GETRDFD(sock1) >= 0 &&
(fd1in->revents /*&(POLLIN|POLLHUP|POLLERR)*/)) {
if (fd1in->revents & POLLNVAL) {
/* this is what we find on Mac OS X when poll()'ing on a device or
named pipe. a read() might imm. return with 0 bytes, resulting
in a loop? */
Error1("poll(...[%d]: invalid request", fd1in->fd);
free(buff);
return -1;
}
mayrd1 = true;
}
if (XIO_READABLE(sock2) && XIO_GETRDFD(sock2) >= 0 &&
(fd2in->revents)) {
if (fd2in->revents & POLLNVAL) {
Error1("poll(...[%d]: invalid request", fd2in->fd);
free(buff);
return -1;
}
mayrd2 = true;
}
if (XIO_GETWRFD(sock1) >= 0 && fd1out->fd >= 0 && fd1out->revents) {
if (fd1out->revents & POLLNVAL) {
Error1("poll(...[%d]: invalid request", fd1out->fd);
free(buff);
return -1;
}
maywr1 = true;
}
if (XIO_GETWRFD(sock2) >= 0 && fd2out->fd >= 0 && fd2out->revents) {
if (fd2out->revents & POLLNVAL) {