add generic setsockopt address options

CHANGES

@@ -1,7 +1,10 @@
 
 new features:
-	added address options IOCTL-VOID, IOCTL-INT, IOCTL-INTP, IOCTL-STRING,
-	IOCTL-BIN for generic ioctl() calls.
+	added address options ioctl-void, ioctl-int, ioctl-intp, ioctl-string,
+	ioctl-bin for generic ioctl() calls.
+
+	added address options setsockopt-int, setsockopt-bin, and
+	setsockopt-string
 
 corrections:
 	some raw IP and UNIX datagram modes failed on BSD systems

EXAMPLES

@@ -286,11 +286,27 @@ $ socat -d -d -d -d - udp-datagram:224.0.0.2:6666,bind=:6666,ip-add-membership=2
 // socket bound to specific address
 
 //=============================================================================
-// IOCTL
+// GENERIC FUNCTION CALLS
 
-// open CD drive (given value valid on Linux)
+// ioctl(): open CD drive (given value valid on Linux)
+// on my Linux system I find in /usr/include/linux/cdrom.h the define:
+// #define CDROMEJECT           0x5309 /* Ejects the cdrom media */
+// the following command makes something like ioctl(fd, CDROMEJECT, NULL)
 $ socat /dev/cdrom,o-nonblock,ioctl-void=0x5309 -
 
+// setsockopt(): SO_REUSEADDR
+// the following command performs - beyond lots of overhead - something like:
+// myint=1; setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &myint, sizeof(myint))
+$ socat -u udp-recv:7777,setsockopt-int=1:2:1 -
+// setsockopt(): SO_BINDTODEVICE
+
+// ways to apply SO_BINDTODEVICE without using the special socat address option
+// so-bindtodevice:
+// with string argument:
+$ sudo ./socat tcp-l:7777,setsockopt-string=1:25:eth0 pipe
+// with binary argument:
+$ sudo ./socat tcp-l:7777,setsockopt-bin=1:25:x6574683000 pipe
+
 ===============================================================================
 
 // not tested, just ideas, or have problems

VERSION

@@ -1 +1 @@
-"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock+ioctl"
+"1.6.0.1+ip4bind+recvfromfork+x64+execstderr+execspaces+cosmetics+poll+udplistencont+ignoreeofunblock+ioctl+ioctl+setsockopt"

doc/socat.yo

@@ -1653,6 +1653,22 @@ COMMENT(label(OPTION_USEIFBUFS)dit(bf(tt(useifbufs)))
 label(OPTION_PROTOCOL_FAMILY)dit(bf(tt(pf=<string>)))
    Forces the use of the specified IP version. <string> can be
    something like "ip4" or "ip6".
+label(OPTION_SETSOCKOPT_INT)dit(bf(tt(setsockopt-int=<level>:<optname>:<optval>)))
+   Invokes tt(setsockopt()) for the socket with the given parameters. tt(level)
+   [link(int)(TYPE_INT)] specifies the second argument to tt(setsockopt())
+   which specifies the layer, e.g. SOL_TCP (=6 on Linux) for TCP, or SOL_SOCKET
+   (=1 on Linux) for the socket layer. tt(optname) [link(int)(TYPE_INT)]
+   selects the third argument to tt(setsockopt()) option. For the actual
+   integer values you might have to look up the appropriate include file of
+   your system. The 4th tt(setsockopt()) parameter, tt(value)
+   [link(int)(TYPE_INT)], is passed to the function per pointer, and the length
+   parameter to the tt(setsockopt()) call is derived from this type.
+label(OPTION_SETSOCKOPT_BIN)dit(bf(tt(setsockopt-bin=<level>:<optname>:<optval>)))
+   Like tt(setsockopt-int), but <optval> is expected in link(dalan)(TYPE_DATA)
+   format and specifies an arbitrary sequence of bytes.
+label(OPTION_SETSOCKOPT_STRING)dit(bf(tt(setsockopt-string=<level>:<optname>:<optval>)))
+   Like tt(setsockopt-int), but <optval> must be a link(string)(TYPE_STRING).
+   This string is passed to the function with trailing null character.
 enddit()
 
 startdit()enddit()nl()

xio-socket.c

@@ -128,6 +128,12 @@ const struct optdesc opt_bind        = { "bind",      NULL, OPT_BIND,        GRO
 const struct optdesc opt_connect_timeout = { "connect-timeout", NULL, OPT_CONNECT_TIMEOUT, GROUP_SOCKET, PH_PASTSOCKET, TYPE_TIMEVAL, OFUNC_OFFSET, (int)&((xiofile_t *)0)->stream.para.socket.connect_timeout };
 const struct optdesc opt_protocol_family = { "protocol-family", "pf", OPT_PROTOCOL_FAMILY, GROUP_SOCKET, PH_PRESOCKET,  TYPE_STRING,  OFUNC_SPEC };
 
+/* generic setsockopt() options */
+const struct optdesc opt_setsockopt_int    = { "setsockopt-int",    "sockopt-int",    OPT_SETSOCKOPT_INT,    GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT_INT_INT,    OFUNC_SPEC, 0, 0 };
+const struct optdesc opt_setsockopt_bin    = { "setsockopt-bin",    "sockopt-bin",    OPT_SETSOCKOPT_BIN,    GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT_INT_BIN,    OFUNC_SPEC, 0, 0 };
+const struct optdesc opt_setsockopt_string = { "setsockopt-string", "sockopt-string", OPT_SETSOCKOPT_STRING, GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT_INT_STRING, OFUNC_SPEC, 0, 0 };
+
+
 /* a subroutine that is common to all socket addresses that want to connect
    to a peer address.
    might fork.

xio-socket.h

@@ -50,6 +50,9 @@ extern const struct optdesc opt_fiosetown;
 extern const struct optdesc opt_siocspgrp;
 extern const struct optdesc opt_bind;
 extern const struct optdesc opt_protocol_family;
+extern const struct optdesc opt_setsockopt_int;
+extern const struct optdesc opt_setsockopt_bin;
+extern const struct optdesc opt_setsockopt_string;
 
 extern int retropt_socket_pf(struct opt *opts, int *pf);
 

xio.h

@@ -356,6 +356,7 @@ struct opt {
    const struct optdesc *desc;
    union integral value;
    union integral value2;
+   union integral value3;
 } ;
 
 extern const char *PIPESEP;

xioopts.c

@@ -1196,6 +1196,9 @@ const struct optname optionnames[] = {
 #if WITH_EXEC || WITH_SYSTEM
 	IF_EXEC   ("setsid",	&opt_setsid)
 #endif
+	IF_SOCKET ("setsockopt-bin",	&opt_setsockopt_bin)
+	IF_SOCKET ("setsockopt-int",	&opt_setsockopt_int)
+	IF_SOCKET ("setsockopt-string",	&opt_setsockopt_string)
 	IF_ANY    ("setuid",	&opt_setuid)
 	IF_ANY    ("setuid-early",	&opt_setuid_early)
 #if WITH_EXEC || WITH_SYSTEM
@@ -2031,13 +2034,97 @@ int parseopts_table(const char **a, unsigned int groups, struct opt **opts,
 		      ent->desc->defname);
 	    }
 	    ++rest;
-	    if (((*opts)[i].value2.u_string = strdup(token)) == NULL) {
+	    if (((*opts)[i].value2.u_string = strdup(rest)) == NULL) {
 	       Error("out of memory"); return -1;
 	    }
 	 }
-	 Info3("setting option \"%s\" to %d:\"$s\"", ent->desc->defname,
+	 Info3("setting option \"%s\" to %d:\"%s\"", ent->desc->defname,
 	       (*opts)[i].value.u_int, (*opts)[i].value2.u_string);
 	 break;
+      case TYPE_INT_INT_INT:
+	 if (!assign) {
+	    Error1("option \"%s\": values required", a0);
+	    continue;
+	 }
+	 {
+	    char *rest;
+	    (*opts)[i].value.u_int = strtoul(token, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    (*opts)[i].value2.u_int = strtoul(rest, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    (*opts)[i].value3.u_int = strtoul(rest, &rest, 0);
+	 }
+	 Info4("setting option \"%s\" to %d:%d:%d", ent->desc->defname,
+	       (*opts)[i].value.u_int, (*opts)[i].value2.u_int, (*opts)[i].value3.u_int);
+	 break;
+      case TYPE_INT_INT_BIN:
+	 if (!assign) {
+	    Error1("option \"%s\": values required", a0);
+	    continue;
+	 }
+	 {
+	    char *rest;
+	    (*opts)[i].value.u_int = strtoul(token, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    (*opts)[i].value2.u_int = strtoul(rest, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    optlen = 0;
+	    if ((result = dalan(rest, optbuf, &optlen, sizeof(optbuf))) != 0) {
+	       Error1("parseopts(): problem with \"%s\" data", rest);
+	       continue;
+	    }
+	    if (((*opts)[i].value3.u_bin.b_data = memdup(optbuf, optlen)) == NULL) {
+	       Error1("memdup(, "F_Zu"): out of memory", optlen);
+	       return -1;
+	    }
+	    (*opts)[i].value3.u_bin.b_len = optlen;
+	 }
+	 Info3("setting option \"%s\" to %d:%d:..."/*!!!*/, ent->desc->defname,
+	       (*opts)[i].value.u_int, (*opts)[i].value2.u_int);
+	 break;
+      case TYPE_INT_INT_STRING:
+	 if (!assign) {
+	    Error1("option \"%s\": values required", a0);
+	    continue;
+	 }
+	 {
+	    char *rest;
+	    (*opts)[i].value.u_int = strtoul(token, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    (*opts)[i].value2.u_int = strtoul(rest, &rest, 0);
+	    if (*rest != ':') {
+	       Error1("option \"%s\": 3 arguments required",
+		      ent->desc->defname);
+	    }
+	    ++rest;
+	    if (((*opts)[i].value3.u_string = strdup(rest)) == NULL) {
+	       Error("out of memory"); return -1;
+	    }
+	 }
+	 Info4("setting option \"%s\" to %d:%d:\"%s\"", ent->desc->defname,
+	       (*opts)[i].value.u_int, (*opts)[i].value2.u_int,
+	       (*opts)[i].value3.u_int);
+	 break;
 #if defined(HAVE_STRUCT_IP_MREQ) || defined (HAVE_STRUCT_IP_MREQN)
       case TYPE_IP_MREQN:
 	 {
@@ -3134,6 +3221,53 @@ int applyopts(int fd, struct opt *opts, unsigned int phase) {
 	       Error1("ioctl() data type %d not implemented", opt->desc->type);
 	    }
 	    break;
+	 case OPT_SETSOCKOPT_INT:
+	    switch (opt->desc->type) {
+	    case TYPE_INT_INT_INT:
+	       if (Setsockopt(fd, opt->value.u_int, opt->value2.u_int,
+			      &opt->value3.u_int, sizeof(int)) < 0) {
+		  Error6("setsockopt(%d, %d, %d, {%d}, "F_Zu"): %s",
+			 fd, opt->value.u_int, opt->value2.u_int,
+			 opt->value3.u_int, sizeof(int), strerror(errno));
+	       }
+	       break;
+	    default:
+	       Error1("setsockopt() data type %d not implemented",
+		      opt->desc->type);
+	    }
+	    break;
+	 case OPT_SETSOCKOPT_BIN:
+	    switch (opt->desc->type) {
+	    case TYPE_INT_INT_BIN:
+	       if (Setsockopt(fd, opt->value.u_int, opt->value2.u_int,
+			      opt->value3.u_bin.b_data, opt->value3.u_bin.b_len) < 0) {
+		  Error5("setsockopt(%d, %d, %d, {...}, "F_Zu"): %s",
+			 fd, opt->value.u_int, opt->value2.u_int,
+			 opt->value3.u_bin.b_len, strerror(errno));
+	       }
+	       break;
+	    default:
+	       Error1("setsockopt() data type %d not implemented",
+		      opt->desc->type);
+	    }
+	    break;
+	 case OPT_SETSOCKOPT_STRING:
+	    switch (opt->desc->type) {
+	    case TYPE_INT_INT_STRING:
+	       if (Setsockopt(fd, opt->value.u_int, opt->value2.u_int,
+			      opt->value3.u_string,
+			      strlen(opt->value3.u_string)+1) < 0) {
+		  Error6("setsockopt(%d, %d, %d, \"%s\", "F_Zu"): %s",
+			 fd, opt->value.u_int, opt->value2.u_int,
+			 opt->value3.u_string, strlen(opt->value3.u_string)+1,
+			 strerror(errno));
+	       }
+	       break;
+	    default:
+	       Error1("setsockopt() data type %d not implemented",
+		      opt->desc->type);
+	    }
+	    break;
 	       
 	 default: Error1("applyopts(): option \"%s\" not implemented",
 			 opt->desc->defname);

xioopts.h

@@ -56,6 +56,9 @@ enum e_types {
    TYPE_INT_INT,	/* 2 parameters: first is int, second is int */
    TYPE_INT_BIN,	/* 2 parameters: first is int, second is binary */
    TYPE_INT_STRING,	/* 2 parameters: first is int, second is req string */
+   TYPE_INT_INT_INT,	/* 3 params: first and second are int, 3rd is int */
+   TYPE_INT_INT_BIN,	/* 3 params: first and second are int, 3rd is binary */
+   TYPE_INT_INT_STRING,	/* 3 params: first and second are int, 3rd is string */
 
    TYPE_2BYTE = TYPE_USHORT
 } ;
@@ -542,6 +545,9 @@ enum e_optcode {
    OPT_SETGID_EARLY,
    OPT_SETPGID,
    OPT_SETSID,
+   OPT_SETSOCKOPT_BIN,
+   OPT_SETSOCKOPT_INT,
+   OPT_SETSOCKOPT_STRING,
    OPT_SETUID,
    OPT_SETUID_EARLY,
    OPT_SIGHUP,