mirror of
https://github.com/moparisthebest/socat
synced 2024-12-21 14:38:48 -05:00
new address option "escape" allows to break a socat instance
This commit is contained in:
Gerhard Rieger
parent
d70b8963aa
commit
c86345a615
4
CHANGES
4
CHANGES
@ -1,4 +1,8 @@
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new features:
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new address option "escape" allows to break a socat instance even when
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raw terminal mode prevents ^C etc.
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corrections:
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some raw IP and UNIX datagram modes failed on BSD systems
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2
VERSION
2
VERSION
@ -1 +1 @@
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"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock"
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"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock+escape"
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18
doc/socat.yo
18
doc/socat.yo
@ -10,7 +10,7 @@ def(Filan)(0)(bf(Filan))
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def(procan)(0)(bf(procan))
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def(Procan)(0)(bf(Procan))
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manpage(socat)(1)(Feb 2008)(socat)()
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manpage(socat)(1)(Jul 2008)(socat)()
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whenhtml(
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label(CONTENTS)
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@ -1516,6 +1516,10 @@ label(OPTION_LOCKFILE)dit(bf(tt(lockfile=<filename>)))
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label(OPTION_WAITLOCK)dit(bf(tt(waitlock=<filename>)))
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If lockfile exists, waits until it disappears. When lockfile does not exist,
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creates it and continues, unlinks lockfile on exit.
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label(OPTION_ESCAPE)dit(bf(tt(escape=<int>)))
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Specifies the numeric code of a character that triggers EOF on the input
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stream. It is useful with a terminal in raw mode
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(link(example)(EXAMPLE_OPTION_ESCAPE)).
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enddit()
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startdit()enddit()nl()
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@ -2630,13 +2634,15 @@ at most 512 data bytes per packet (link(mss)(OPTION_MSS)).
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label(EXAMPLE_ADDRESS_GOPEN)
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label(EXAMPLE_OPTION_RAW)
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label(EXAMPLE_OPTION_ECHO)
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dit(bf(tt(socat - /dev/ttyS0,raw,echo=0,crnl)))
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label(EXAMPLE_OPTION_ESCAPE)
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dit(bf(tt(socat -,raw,echo=0,escape=0x0f /dev/ttyS0,raw,echo=0,crnl)))
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Opens an interactive connection via the serial line, e.g. for talking with a
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modem. link(raw)(OPTION_RAW) and link(echo)(OPTION_ECHO) set ttyS0's terminal
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parameters to practicable values, link(crnl)(OPTION_CRNL)
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converts to correct newline characters. Consider using
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link(READLINE)(ADDRESS_READLINE) instead of `-'.
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modem. link(raw)(OPTION_RAW) and link(echo)(OPTION_ECHO) set the console's and
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ttyS0's terminal parameters to practicable values, link(crnl)(OPTION_CRNL)
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converts to correct newline characters. link(escape)(OPTION_ESCAPE) allows to
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terminate the socat process with character control-O.
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Consider using link(READLINE)(ADDRESS_READLINE) instead of the first address.
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label(EXAMPLE_ADDRESS_UNIX_LISTEN)
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70
socat.c
70
socat.c
@ -948,6 +948,10 @@ int _socat(void) {
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/* avoid idle when all readbytes already there */
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mayrd1 = true;
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}
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/* escape char occurred? */
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if (XIO_RDSTREAM(sock1)->actescape) {
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bytes1 = 0; /* indicate EOF */
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}
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}
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/* (bytes1 == 0) handled later */
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} else {
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@ -976,6 +980,10 @@ int _socat(void) {
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/* avoid idle when all readbytes already there */
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mayrd2 = true;
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}
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/* escape char occurred? */
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if (XIO_RDSTREAM(sock2)->actescape) {
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bytes2 = 0; /* indicate EOF */
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}
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}
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/* (bytes2 == 0) handled later */
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} else {
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@ -988,7 +996,8 @@ int _socat(void) {
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bytes1, XIO_RDSTREAM(sock1)->eof, XIO_RDSTREAM(sock1)->ignoreeof,
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closing);*/
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if (bytes1 == 0 || XIO_RDSTREAM(sock1)->eof >= 2) {
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if (XIO_RDSTREAM(sock1)->ignoreeof && !closing) {
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if (XIO_RDSTREAM(sock1)->ignoreeof &&
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!XIO_RDSTREAM(sock1)->actescape && !closing) {
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Debug1("socket 1 (fd %d) is at EOF, ignoring",
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XIO_RDSTREAM(sock1)->fd); /*! */
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mayrd1 = true;
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@ -996,16 +1005,20 @@ int _socat(void) {
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} else {
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Notice1("socket 1 (fd %d) is at EOF", XIO_GETRDFD(sock1));
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xioshutdown(sock2, SHUT_WR);
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XIO_RDSTREAM(sock1)->eof = 2;
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XIO_RDSTREAM(sock1)->ignoreeof = false;
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if (socat_opts.lefttoright) {
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break;
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}
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closing = 1;
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}
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} else if (polling && XIO_RDSTREAM(sock1)->ignoreeof) {
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polling = 0;
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}
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if (bytes2 == 0 || XIO_RDSTREAM(sock2)->eof >= 2) {
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if (XIO_RDSTREAM(sock2)->ignoreeof && !closing) {
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if (XIO_RDSTREAM(sock2)->ignoreeof &&
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!XIO_RDSTREAM(sock2)->actescape && !closing) {
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Debug1("socket 2 (fd %d) is at EOF, ignoring",
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XIO_RDSTREAM(sock2)->fd);
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mayrd2 = true;
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@ -1013,9 +1026,12 @@ int _socat(void) {
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} else {
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Notice1("socket 2 (fd %d) is at EOF", XIO_GETRDFD(sock2));
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xioshutdown(sock1, SHUT_WR);
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XIO_RDSTREAM(sock2)->eof = 2;
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XIO_RDSTREAM(sock2)->ignoreeof = false;
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if (socat_opts.righttoleft) {
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break;
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}
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closing = 1;
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}
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} else if (polling && XIO_RDSTREAM(sock2)->ignoreeof) {
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polling = 0;
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@ -1102,8 +1118,9 @@ static int
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/* inpipe is suspected to have read data available; read at most bufsiz bytes
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and transfer them to outpipe. Perform required data conversions.
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buff should be at least twice as large as bufsiz, to allow all standard
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conversions. Returns the number of bytes written, or 0 on EOF or <0 if an
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buff must be a malloc()'ed storage and might be realloc()'ed in this
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function if more space is required after conversions.
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Returns the number of bytes written, or 0 on EOF or <0 if an
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error occurred or when data was read but none written due to conversions
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(with EAGAIN). EAGAIN also occurs when reading from a nonblocking FD where
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the file has a mandatory lock.
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@ -1113,9 +1130,9 @@ static int
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/* inpipe, outpipe must be single descriptors (not dual!) */
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int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
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unsigned char **buff, size_t bufsiz, bool righttoleft) {
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ssize_t bytes, writt;
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ssize_t bytes, writt = 0;
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bytes = xioread(inpipe, *buff, socat_opts.bufsiz);
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bytes = xioread(inpipe, *buff, bufsiz);
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if (bytes < 0) {
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if (errno != EAGAIN)
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XIO_RDSTREAM(inpipe)->eof = 2;
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@ -1123,14 +1140,35 @@ int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
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return -1;
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}
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if (bytes == 0 && XIO_RDSTREAM(inpipe)->ignoreeof && !closing) {
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writt = 0;
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;
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} else if (bytes == 0) {
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XIO_RDSTREAM(inpipe)->eof = 2;
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closing = MAX(closing, 1);
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writt = 0;
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}
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else /* if (bytes > 0)*/ {
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if (bytes > 0) {
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/* handle escape char */
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if (XIO_RDSTREAM(inpipe)->escape != -1) {
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/* check input data for escape char */
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unsigned char *ptr = *buff;
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size_t ctr = 0;
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while (ctr < bytes) {
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if (*ptr == XIO_RDSTREAM(inpipe)->escape) {
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/* found: set flag, truncate input data */
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XIO_RDSTREAM(inpipe)->actescape = true;
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bytes = ctr;
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Info("escape char found in input");
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break;
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}
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++ptr; ++ctr;
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}
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if (ctr != bytes) {
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XIO_RDSTREAM(inpipe)->eof = 2;
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}
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}
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}
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if (bytes > 0) {
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if (XIO_RDSTREAM(inpipe)->lineterm !=
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XIO_WRSTREAM(outpipe)->lineterm) {
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@ -1248,8 +1286,14 @@ int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
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#define LF '\n'
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int cv_newline(unsigned char **buff, ssize_t *bytes,
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/* converts the newline characters (or character sequences) from the one
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specified in lineterm1 to that of lineterm2. Possible values are
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LINETERM_CR, LINETERM_CRNL, LINETERM_RAW.
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buff points to the malloc()'ed data, input and output. It may be subject to
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realloc(). bytes specifies the number of bytes input and output */
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int cv_newline(unsigned char **buff, ssize_t *bufsiz,
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int lineterm1, int lineterm2) {
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ssize_t *bytes = bufsiz;
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/* must perform newline changes */
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if (lineterm1 <= LINETERM_CR && lineterm2 <= LINETERM_CR) {
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/* no change in data length */
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@ -1287,7 +1331,7 @@ int cv_newline(unsigned char **buff, ssize_t *bytes,
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*t++ = *s++;
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}
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}
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*bytes = t - *buff;
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*bufsiz = t - *buff;
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} else {
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/* buffer becomes longer, must alloc another space */
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unsigned char *buf2;
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@ -1297,7 +1341,7 @@ int cv_newline(unsigned char **buff, ssize_t *bytes,
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} else {
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from = '\r';
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}
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if ((buf2 = Malloc(2*socat_opts.bufsiz+1)) == NULL) {
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if ((buf2 = Malloc(2*socat_opts.bufsiz/*sic!*/+1)) == NULL) {
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return -1;
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}
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s = *buff; t = buf2; z = *buff + *bytes;
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@ -1312,7 +1356,7 @@ int cv_newline(unsigned char **buff, ssize_t *bytes,
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}
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free(*buff);
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*buff = buf2;
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*bytes = t - buf2;;
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*bufsiz = t - buf2;;
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}
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return 0;
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}
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63
test.sh
63
test.sh
@ -8447,6 +8447,69 @@ esac
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N=$((N+1))
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# test the escape option
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NAME=ESCAPE
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case "$TESTS" in
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*%functions%*|*%escape%*|*%$NAME%*)
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TEST="$NAME: escape character triggers EOF"
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# idea: start socat just echoing input, but apply escape option. send a string
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# containing the escape character and check if the output is truncated
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tf="$td/test$N.stdout"
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te="$td/test$N.stderr"
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tdiff="$td/test$N.diff"
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da="test$N $(date) $RANDOM"
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CMD="$SOCAT $opts -,escape=27 pipe"
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printf "test $F_n $TEST... " $N
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$ECHO "$da\n\x1bXYZ" |$CMD >"$tf" 2>"$te"
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if [ $? -ne 0 ]; then
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$PRINTF "$FAILED: $SOCAT:\n"
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echo "$CMD"
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cat "$te"
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numFAIL=$((numFAIL+1))
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elif ! echo "$da" |diff - "$tf" >"$tdiff"; then
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$PRINTF "$FAILED: diff:\n"
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cat "$tdiff"
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numFAIL=$((numFAIL+1))
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else
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$PRINTF "$OK\n"
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if [ -n "$debug" ]; then cat $te; fi
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numOK=$((numOK+1))
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fi
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esac
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N=$((N+1))
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# test the escape option combined with ignoreeof
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NAME=ESCAPE_IGNOREEOF
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case "$TESTS" in
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*%functions%*|*%ignoreeof%*|*%escape%*|*%$NAME%*)
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TEST="$NAME: escape character triggers EOF"
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# idea: start socat just echoing input, but apply escape option. send a string
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# containing the escape character and check if the output is truncated
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ti="$td/test$N.file"
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tf="$td/test$N.stdout"
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te="$td/test$N.stderr"
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tdiff="$td/test$N.diff"
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da="test$N $(date) $RANDOM"
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CMD="$SOCAT -T 5 $opts file:$ti,ignoreeof,escape=27!!- pipe"
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printf "test $F_n $TEST... " $N
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>"$ti"
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$CMD >"$tf" 2>"$te" &
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$ECHO "$da\n\x1bXYZ" >>"$ti"
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sleep 1
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if ! echo "$da" |diff - "$tf" >"$tdiff"; then
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$PRINTF "$FAILED: diff:\n"
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cat "$tdiff"
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cat "$te"
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numFAIL=$((numFAIL+1))
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else
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$PRINTF "$OK\n"
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if [ -n "$debug" ]; then cat $te; fi
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numOK=$((numOK+1))
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fi
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esac
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N=$((N+1))
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echo "summary: $((N-1)) tests; $numOK ok, $numFAIL failed, $numCANT could not be performed"
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if [ "$numFAIL" -gt 0 ]; then
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@ -1,5 +1,5 @@
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/* source: xio-tun.c */
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/* Copyright Gerhard Rieger 2007 */
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/* Copyright Gerhard Rieger 2007-2008 */
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/* Published under the GNU General Public License V.2, see file COPYING */
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/* this file contains the source for opening addresses of tun/tap type */
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@ -17,8 +17,6 @@
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static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *fd, unsigned groups, int dummy1, int dummy2, int dummy3);
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#define XIO_OFFSETOF(x) ((size_t)&((xiosingle_t *)0)->x)
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/****** TUN addresses ******/
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const struct optdesc opt_tun_device = { "tun-device", NULL, OPT_TUN_DEVICE, GROUP_TUN, PH_OPEN, TYPE_FILENAME, OFUNC_SPEC };
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const struct optdesc opt_tun_name = { "tun-name", NULL, OPT_TUN_NAME, GROUP_INTERFACE, PH_FD, TYPE_STRING, OFUNC_SPEC };
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2
xio.h
2
xio.h
@ -167,6 +167,8 @@ typedef struct single {
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const char *name; /* only with END_UNLINK */
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int (*sigchild)(struct single *); /* callback after sigchild */
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pid_t ppid; /* parent pid, only if we send it signals */
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int escape; /* escape character; -1 for no escape */
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bool actescape; /* escape character found in input data */
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union {
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struct {
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int fdout; /* use fd for output */
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@ -16,6 +16,7 @@ const struct optdesc opt_crnl = { "crnl", NULL, OPT_CRNL, GROUP_A
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const struct optdesc opt_readbytes = { "readbytes", "bytes", OPT_READBYTES, GROUP_APPL, PH_LATE, TYPE_SIZE_T, OFUNC_EXT, (int)(&((struct single *)0)->readbytes), sizeof(((struct single *)0)->readbytes) };
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const struct optdesc opt_lockfile = { "lockfile", NULL, OPT_LOCKFILE, GROUP_APPL, PH_INIT, TYPE_FILENAME, OFUNC_EXT, 0, 0 };
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const struct optdesc opt_waitlock = { "waitlock", NULL, OPT_WAITLOCK, GROUP_APPL, PH_INIT, TYPE_FILENAME, OFUNC_EXT, 0, 0 };
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const struct optdesc opt_escape = { "escape", NULL, OPT_ESCAPE, GROUP_APPL, PH_INIT, TYPE_INT, OFUNC_OFFSET, XIO_OFFSETOF(escape), sizeof(((xiosingle_t *)0)->escape) };
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/****** APPL addresses ******/
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#if WITH_RETRY
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const struct optdesc opt_forever = { "forever", NULL, OPT_FOREVER, GROUP_RETRY, PH_INIT, TYPE_BOOL, OFUNC_EXT, (int)(&((struct single *)0)->forever), sizeof(((struct single *)0)->forever) };
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@ -1,5 +1,5 @@
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/* source: xiolayer.h */
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/* Copyright Gerhard Rieger 2001-2005 */
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/* Copyright Gerhard Rieger 2001-2008 */
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/* Published under the GNU General Public License V.2, see file COPYING */
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#ifndef __xiolayer_h_included
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@ -11,6 +11,7 @@ extern const struct optdesc opt_crnl;
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extern const struct optdesc opt_readbytes;
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extern const struct optdesc opt_lockfile;
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extern const struct optdesc opt_waitlock;
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extern const struct optdesc opt_escape;
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extern const struct optdesc opt_forever;
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extern const struct optdesc opt_intervall;
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extern const struct optdesc opt_retry;
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@ -1,5 +1,5 @@
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/* source: xioopen.c */
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/* Copyright Gerhard Rieger 2001-2007 */
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/* Copyright Gerhard Rieger 2001-2008 */
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/* Published under the GNU General Public License V.2, see file COPYING */
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/* this is the source file of the extended open function */
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@ -301,6 +301,7 @@ static xiofile_t *xioallocfd(void) {
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#endif /* WITH_SOCKET */
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fd->stream.howtoend = END_UNSPEC;
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/* fd->stream.name = NULL; */
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fd->stream.escape = -1;
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/* fd->stream.para.exec.pid = 0; */
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fd->stream.lineterm = LINETERM_RAW;
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@ -397,6 +397,7 @@ const struct optname optionnames[] = {
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IF_TERMIOS("eol2", &opt_veol2)
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IF_TERMIOS("erase", &opt_verase)
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IF_SOCKET ("error", &opt_so_error)
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IF_ANY ("escape", &opt_escape)
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IF_OPEN ("excl", &opt_o_excl)
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#if WITH_EXT2 && defined(EXT2_APPEND_FL)
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IF_ANY ("ext2-append", &opt_ext2_append)
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@ -3339,6 +3340,8 @@ static int applyopt_offset(struct single *xfd, struct opt *opt) {
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switch (opt->desc->type) {
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case TYPE_BOOL:
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*(bool *)ptr = opt->value.u_bool; break;
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case TYPE_INT:
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*(int *)ptr = opt->value.u_int; break;
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case TYPE_DOUBLE:
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*(double *)ptr = opt->value.u_double; break;
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case TYPE_TIMEVAL:
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@ -9,6 +9,8 @@
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#define ODESC_DONE ((void *)-1) /* indicates that option has been applied */
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#define ODESC_ERROR ODESC_DONE /* maybe later */
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#define XIO_OFFSETOF(x) ((size_t)&((xiosingle_t *)0)->x)
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/* atomic structure for use in the option search table; keep compatible with
|
||||
struct wordent! */
|
||||
struct optname {
|
||||
@ -250,6 +252,7 @@ enum e_optcode {
|
||||
OPT_ECHOPRT, /* termios.c_lflag */
|
||||
#endif
|
||||
OPT_END_CLOSE, /* xfd.stream.howtoend = END_CLOSE */
|
||||
OPT_ESCAPE,
|
||||
OPT_EXT2_SECRM,
|
||||
OPT_EXT2_UNRM,
|
||||
OPT_EXT2_COMPR,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user