/* Copyright (C) 1996,1997,1998,2000,2001,2004 Free Software Foundation, Inc. * * 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, 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 software; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA * * As a special exception, the Free Software Foundation gives permission * for additional uses of the text contained in its release of GUILE. * * The exception is that, if you link the GUILE library with other files * to produce an executable, this does not by itself cause the * resulting executable to be covered by the GNU General Public License. * Your use of that executable is in no way restricted on account of * linking the GUILE library code into it. * * This exception does not however invalidate any other reasons why * the executable file might be covered by the GNU General Public License. * * This exception applies only to the code released by the * Free Software Foundation under the name GUILE. If you copy * code from other Free Software Foundation releases into a copy of * GUILE, as the General Public License permits, the exception does * not apply to the code that you add in this way. To avoid misleading * anyone as to the status of such modified files, you must delete * this exception notice from them. * * If you write modifications of your own for GUILE, it is your choice * whether to permit this exception to apply to your modifications. * If you do not wish that, delete this exception notice. */ #include #include "libguile/_scm.h" #include "libguile/unif.h" #include "libguile/feature.h" #include "libguile/fports.h" #include "libguile/strings.h" #include "libguile/vectors.h" #include "libguile/validate.h" #include "libguile/socket.h" #ifdef HAVE_STRING_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #include #ifdef HAVE_WINSOCK2_H #include #else #include #ifdef HAVE_UNIX_DOMAIN_SOCKETS #include #endif #include #include #include #endif #if defined (HAVE_UNIX_DOMAIN_SOCKETS) && !defined (SUN_LEN) #define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \ + strlen ((ptr)->sun_path)) #endif #if !defined (HAVE_UINT32_T) #if SIZEOF_INT == 4 typedef unsigned int uint32_t; #elif SIZEOF_LONG == 4 typedef unsigned long uint32_t; #else #error can not define uint32_t #endif #endif /* we are not currently using socklen_t. it's not defined on all systems, so would need to be checked by configure. in the meantime, plain int is the best alternative. */ SCM_DEFINE (scm_htons, "htons", 1, 0, 0, (SCM value), "Convert a 16 bit quantity from host to network byte ordering.\n" "@var{value} is packed into 2 bytes, which are then converted\n" "and returned as a new integer.") #define FUNC_NAME s_scm_htons { unsigned short c_in; SCM_VALIDATE_INUM_COPY (1, value, c_in); if (c_in != SCM_INUM (value)) SCM_OUT_OF_RANGE (1, value); return SCM_MAKINUM (htons (c_in)); } #undef FUNC_NAME SCM_DEFINE (scm_ntohs, "ntohs", 1, 0, 0, (SCM value), "Convert a 16 bit quantity from network to host byte ordering.\n" "@var{value} is packed into 2 bytes, which are then converted\n" "and returned as a new integer.") #define FUNC_NAME s_scm_ntohs { unsigned short c_in; SCM_VALIDATE_INUM_COPY (1, value, c_in); if (c_in != SCM_INUM (value)) SCM_OUT_OF_RANGE (1, value); return SCM_MAKINUM (ntohs (c_in)); } #undef FUNC_NAME SCM_DEFINE (scm_htonl, "htonl", 1, 0, 0, (SCM value), "Convert a 32 bit quantity from host to network byte ordering.\n" "@var{value} is packed into 4 bytes, which are then converted\n" "and returned as a new integer.") #define FUNC_NAME s_scm_htonl { uint32_t c_in = SCM_NUM2ULONG (1, value); return scm_ulong2num (htonl (c_in)); } #undef FUNC_NAME SCM_DEFINE (scm_ntohl, "ntohl", 1, 0, 0, (SCM value), "Convert a 32 bit quantity from network to host byte ordering.\n" "@var{value} is packed into 4 bytes, which are then converted\n" "and returned as a new integer.") #define FUNC_NAME s_scm_ntohl { uint32_t c_in = SCM_NUM2ULONG (1, value); return scm_ulong2num (ntohl (c_in)); } #undef FUNC_NAME #ifndef HAVE_INET_ATON /* for our definition in inet_aton.c, not usually needed. */ extern int inet_aton (); #endif SCM_DEFINE (scm_inet_aton, "inet-aton", 1, 0, 0, (SCM address), "Convert an IPv4 Internet address from printable string\n" "(dotted decimal notation) to an integer. E.g.,\n\n" "@lisp\n" "(inet-aton \"127.0.0.1\") @result{} 2130706433\n" "@end lisp") #define FUNC_NAME s_scm_inet_aton { struct in_addr soka; SCM_VALIDATE_STRING (1, address); SCM_STRING_COERCE_0TERMINATION_X (address); if (inet_aton (SCM_STRING_CHARS (address), &soka) == 0) SCM_MISC_ERROR ("bad address", SCM_EOL); return scm_ulong2num (ntohl (soka.s_addr)); } #undef FUNC_NAME SCM_DEFINE (scm_inet_ntoa, "inet-ntoa", 1, 0, 0, (SCM inetid), "Convert an IPv4 Internet address to a printable\n" "(dotted decimal notation) string. E.g.,\n\n" "@lisp\n" "(inet-ntoa 2130706433) @result{} \"127.0.0.1\"\n" "@end lisp") #define FUNC_NAME s_scm_inet_ntoa { struct in_addr addr; char *s; SCM answer; addr.s_addr = htonl (SCM_NUM2ULONG (1, inetid)); s = inet_ntoa (addr); answer = scm_mem2string (s, strlen (s)); return answer; } #undef FUNC_NAME #ifdef HAVE_INET_NETOF SCM_DEFINE (scm_inet_netof, "inet-netof", 1, 0, 0, (SCM address), "Return the network number part of the given IPv4\n" "Internet address. E.g.,\n\n" "@lisp\n" "(inet-netof 2130706433) @result{} 127\n" "@end lisp") #define FUNC_NAME s_scm_inet_netof { struct in_addr addr; addr.s_addr = htonl (SCM_NUM2ULONG (1, address)); return scm_ulong2num ((unsigned long) inet_netof (addr)); } #undef FUNC_NAME #endif #ifdef HAVE_INET_LNAOF SCM_DEFINE (scm_lnaof, "inet-lnaof", 1, 0, 0, (SCM address), "Return the local-address-with-network part of the given\n" "IPv4 Internet address, using the obsolete class A/B/C system.\n" "E.g.,\n\n" "@lisp\n" "(inet-lnaof 2130706433) @result{} 1\n" "@end lisp") #define FUNC_NAME s_scm_lnaof { struct in_addr addr; addr.s_addr = htonl (SCM_NUM2ULONG (1, address)); return scm_ulong2num ((unsigned long) inet_lnaof (addr)); } #undef FUNC_NAME #endif #ifdef HAVE_INET_MAKEADDR SCM_DEFINE (scm_inet_makeaddr, "inet-makeaddr", 2, 0, 0, (SCM net, SCM lna), "Make an IPv4 Internet address by combining the network number\n" "@var{net} with the local-address-within-network number\n" "@var{lna}. E.g.,\n\n" "@lisp\n" "(inet-makeaddr 127 1) @result{} 2130706433\n" "@end lisp") #define FUNC_NAME s_scm_inet_makeaddr { struct in_addr addr; unsigned long netnum; unsigned long lnanum; netnum = SCM_NUM2ULONG (1, net); lnanum = SCM_NUM2ULONG (2, lna); addr = inet_makeaddr (netnum, lnanum); return scm_ulong2num (ntohl (addr.s_addr)); } #undef FUNC_NAME #endif #ifdef HAVE_IPV6 /* flip a 128 bit IPv6 address between host and network order. */ #ifdef WORDS_BIGENDIAN #define FLIP_NET_HOST_128(addr) #else #define FLIP_NET_HOST_128(addr)\ {\ int i;\ \ for (i = 0; i < 8; i++)\ {\ char c = (addr)[i];\ \ (addr)[i] = (addr)[15 - i];\ (addr)[15 - i] = c;\ }\ } #endif /* convert a 128 bit IPv6 address in network order to a host ordered SCM integer. */ static SCM ipv6_net_to_num (const char *src) { int big_digits = 128 / SCM_BITSPERDIG; const int bytes_per_dig = SCM_BITSPERDIG / 8; char addr[16]; char *ptr = addr; SCM result; memcpy (addr, src, 16); /* get rid of leading zeros. */ while (big_digits > 0) { long test = 0; memcpy (&test, ptr, bytes_per_dig); if (test != 0) break; ptr += bytes_per_dig; big_digits--; } FLIP_NET_HOST_128 (addr); if (big_digits * bytes_per_dig <= sizeof (unsigned long)) { /* this is just so that we use INUM where possible. */ unsigned long l_addr; memcpy (&l_addr, addr, sizeof (unsigned long)); result = scm_ulong2num (l_addr); } else { result = scm_i_mkbig (big_digits, 0); memcpy (SCM_BDIGITS (result), addr, big_digits * bytes_per_dig); } return result; } /* convert a host ordered SCM integer to a 128 bit IPv6 address in network order. */ static void ipv6_num_to_net (SCM src, char *dst) { if (SCM_INUMP (src)) { uint32_t addr = htonl (SCM_INUM (src)); memset (dst, 0, 12); memcpy (dst + 12, &addr, 4); } else { memset (dst, 0, 16); memcpy (dst, SCM_BDIGITS (src), SCM_NUMDIGS (src) * (SCM_BITSPERDIG / 8)); FLIP_NET_HOST_128 (dst); } } /* check that an SCM variable contains an IPv6 integer address. */ #define VALIDATE_INET6(which_arg, address)\ if (SCM_INUMP (address))\ SCM_ASSERT_RANGE (which_arg, address, SCM_INUM (address) >= 0);\ else\ {\ SCM_VALIDATE_BIGINT (which_arg, address);\ SCM_ASSERT_RANGE (which_arg, address,\ !SCM_BIGSIGN (address)\ && (SCM_BITSPERDIG\ * SCM_NUMDIGS (address) <= 128));\ } #ifdef HAVE_INET_PTON SCM_DEFINE (scm_inet_pton, "inet-pton", 2, 0, 0, (SCM family, SCM address), "Convert a string containing a printable network address to\n" "an integer address. Note that unlike the C version of this\n" "function,\n" "the result is an integer with normal host byte ordering.\n" "@var{family} can be @code{AF_INET} or @code{AF_INET6}. E.g.,\n\n" "@lisp\n" "(inet-pton AF_INET \"127.0.0.1\") @result{} 2130706433\n" "(inet-pton AF_INET6 \"::1\") @result{} 1\n" "@end lisp") #define FUNC_NAME s_scm_inet_pton { int af; char *src; char dst[16]; int rv; SCM_VALIDATE_INUM_COPY (1, family, af); SCM_ASSERT_RANGE (1, family, af == AF_INET || af == AF_INET6); SCM_VALIDATE_STRING_COPY (2, address, src); rv = inet_pton (af, src, dst); if (rv == -1) SCM_SYSERROR; else if (rv == 0) SCM_MISC_ERROR ("Bad address", SCM_EOL); if (af == AF_INET) return scm_ulong2num (ntohl (*(uint32_t *) dst)); else return ipv6_net_to_num ((char *) dst); } #undef FUNC_NAME #endif #ifdef HAVE_INET_NTOP SCM_DEFINE (scm_inet_ntop, "inet-ntop", 2, 0, 0, (SCM family, SCM address), "Convert a network address into a printable string.\n" "Note that unlike the C version of this function,\n" "the input is an integer with normal host byte ordering.\n" "@var{family} can be @code{AF_INET} or @code{AF_INET6}. E.g.,\n\n" "@lisp\n" "(inet-ntop AF_INET 2130706433) @result{} \"127.0.0.1\"\n" "(inet-ntop AF_INET6 (- (expt 2 128) 1)) @result{}\n" "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff\n" "@end lisp") #define FUNC_NAME s_scm_inet_ntop { int af; #ifdef INET6_ADDRSTRLEN char dst[INET6_ADDRSTRLEN]; #else char dst[46]; #endif char addr6[16]; SCM_VALIDATE_INUM_COPY (1, family, af); SCM_ASSERT_RANGE (1, family, af == AF_INET || af == AF_INET6); if (af == AF_INET) *(uint32_t *) addr6 = htonl (SCM_NUM2ULONG (2, address)); else { VALIDATE_INET6 (2, address); ipv6_num_to_net (address, addr6); } if (inet_ntop (af, &addr6, dst, sizeof dst) == NULL) SCM_SYSERROR; return scm_makfrom0str (dst); } #undef FUNC_NAME #endif #endif /* HAVE_IPV6 */ SCM_SYMBOL (sym_socket, "socket"); #define SCM_SOCK_FD_TO_PORT(fd) scm_fdes_to_port (fd, "r+0", sym_socket) SCM_DEFINE (scm_socket, "socket", 3, 0, 0, (SCM family, SCM style, SCM proto), "Return a new socket port of the type specified by @var{family},\n" "@var{style} and @var{proto}. All three parameters are\n" "integers. Supported values for @var{family} are\n" "@code{AF_UNIX}, @code{AF_INET} and @code{AF_INET6}.\n" "Typical values for @var{style} are @code{SOCK_STREAM},\n" "@code{SOCK_DGRAM} and @code{SOCK_RAW}.\n\n" "@var{proto} can be obtained from a protocol name using\n" "@code{getprotobyname}. A value of zero specifies the default\n" "protocol, which is usually right.\n\n" "A single socket port cannot by used for communication until it\n" "has been connected to another socket.") #define FUNC_NAME s_scm_socket { int fd; SCM_VALIDATE_INUM (1, family); SCM_VALIDATE_INUM (2, style); SCM_VALIDATE_INUM (3, proto); fd = socket (SCM_INUM (family), SCM_INUM (style), SCM_INUM (proto)); if (fd == -1) SCM_SYSERROR; return SCM_SOCK_FD_TO_PORT (fd); } #undef FUNC_NAME #ifdef HAVE_SOCKETPAIR SCM_DEFINE (scm_socketpair, "socketpair", 3, 0, 0, (SCM family, SCM style, SCM proto), "Return a pair of connected (but unnamed) socket ports of the\n" "type specified by @var{family}, @var{style} and @var{proto}.\n" "Many systems support only socket pairs of the @code{AF_UNIX}\n" "family. Zero is likely to be the only meaningful value for\n" "@var{proto}.") #define FUNC_NAME s_scm_socketpair { int fam; int fd[2]; SCM_VALIDATE_INUM (1,family); SCM_VALIDATE_INUM (2,style); SCM_VALIDATE_INUM (3,proto); fam = SCM_INUM (family); if (socketpair (fam, SCM_INUM (style), SCM_INUM (proto), fd) == -1) SCM_SYSERROR; return scm_cons (SCM_SOCK_FD_TO_PORT (fd[0]), SCM_SOCK_FD_TO_PORT (fd[1])); } #undef FUNC_NAME #endif SCM_DEFINE (scm_getsockopt, "getsockopt", 3, 0, 0, (SCM sock, SCM level, SCM optname), "Return the value of a particular socket option for the socket\n" "port @var{sock}. @var{level} is an integer code for type of\n" "option being requested, e.g., @code{SOL_SOCKET} for\n" "socket-level options. @var{optname} is an integer code for the\n" "option required and should be specified using one of the\n" "symbols @code{SO_DEBUG}, @code{SO_REUSEADDR} etc.\n\n" "The returned value is typically an integer but @code{SO_LINGER}\n" "returns a pair of integers.") #define FUNC_NAME s_scm_getsockopt { int fd; /* size of optval is the largest supported option. */ #ifdef HAVE_STRUCT_LINGER char optval[sizeof (struct linger)]; int optlen = sizeof (struct linger); #else char optval[sizeof (size_t)]; int optlen = sizeof (size_t); #endif int ilevel; int ioptname; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1, sock); SCM_VALIDATE_INUM_COPY (2, level, ilevel); SCM_VALIDATE_INUM_COPY (3, optname, ioptname); fd = SCM_FPORT_FDES (sock); if (getsockopt (fd, ilevel, ioptname, (void *) optval, &optlen) == -1) SCM_SYSERROR; if (ilevel == SOL_SOCKET) { #ifdef SO_LINGER if (ioptname == SO_LINGER) { #ifdef HAVE_STRUCT_LINGER struct linger *ling = (struct linger *) optval; return scm_cons (scm_long2num (ling->l_onoff), scm_long2num (ling->l_linger)); #else return scm_cons (scm_long2num (*(int *) optval), SCM_MAKINUM (0)); #endif } else #endif if (0 #ifdef SO_SNDBUF || ioptname == SO_SNDBUF #endif #ifdef SO_RCVBUF || ioptname == SO_RCVBUF #endif ) { return scm_long2num (*(size_t *) optval); } } return scm_long2num (*(int *) optval); } #undef FUNC_NAME SCM_DEFINE (scm_setsockopt, "setsockopt", 4, 0, 0, (SCM sock, SCM level, SCM optname, SCM value), "Set the value of a particular socket option for the socket\n" "port @var{sock}. @var{level} is an integer code for type of option\n" "being set, e.g., @code{SOL_SOCKET} for socket-level options.\n" "@var{optname} is an\n" "integer code for the option to set and should be specified using one of\n" "the symbols @code{SO_DEBUG}, @code{SO_REUSEADDR} etc.\n" "@var{value} is the value to which the option should be set. For\n" "most options this must be an integer, but for @code{SO_LINGER} it must\n" "be a pair.\n\n" "The return value is unspecified.") #define FUNC_NAME s_scm_setsockopt { int fd; int optlen = -1; /* size of optval is the largest supported option. */ #ifdef HAVE_STRUCT_LINGER char optval[sizeof (struct linger)]; #else char optval[sizeof (size_t)]; #endif int ilevel, ioptname; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1, sock); SCM_VALIDATE_INUM_COPY (2, level, ilevel); SCM_VALIDATE_INUM_COPY (3, optname, ioptname); fd = SCM_FPORT_FDES (sock); if (ilevel == SOL_SOCKET) { #ifdef SO_LINGER if (ioptname == SO_LINGER) { #ifdef HAVE_STRUCT_LINGER struct linger ling; long lv; SCM_ASSERT (SCM_CONSP (value), value, SCM_ARG4, FUNC_NAME); lv = SCM_NUM2LONG (4, SCM_CAR (value)); ling.l_onoff = (int) lv; SCM_ASSERT_RANGE (SCM_ARG4, value, ling.l_onoff == lv); lv = SCM_NUM2LONG (4, SCM_CDR (value)); ling.l_linger = (int) lv; SCM_ASSERT_RANGE (SCM_ARG4, value, ling.l_linger == lv); optlen = (int) sizeof (struct linger); memcpy (optval, (void *) &ling, optlen); #else int ling; long lv; SCM_ASSERT (SCM_CONSP (value), value, SCM_ARG4, FUNC_NAME); /* timeout is ignored, but may as well validate it. */ lv = SCM_NUM2LONG (4, SCM_CDR (value)); ling = (int) lv; SCM_ASSERT_RANGE (SCM_ARG4, value, ling == lv); lv = SCM_NUM2LONG (4, SCM_CAR (value)); ling = (int) lv; SCM_ASSERT_RANGE (SCM_ARG4, value, ling == lv); optlen = (int) sizeof (int); (*(int *) optval) = ling; #endif } else #endif if (0 #ifdef SO_SNDBUF || ioptname == SO_SNDBUF #endif #ifdef SO_RCVBUF || ioptname == SO_RCVBUF #endif ) { long lv = SCM_NUM2LONG (4, value); optlen = (int) sizeof (size_t); (*(size_t *) optval) = (size_t) lv; } } if (optlen == -1) { /* Most options take an int. */ long lv = SCM_NUM2LONG (4, value); int val = (int) lv; SCM_ASSERT_RANGE (SCM_ARG4, value, val == lv); optlen = (int) sizeof (int); (*(int *) optval) = val; } if (setsockopt (fd, ilevel, ioptname, (void *) optval, optlen) == -1) SCM_SYSERROR; return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_shutdown, "shutdown", 2, 0, 0, (SCM sock, SCM how), "Sockets can be closed simply by using @code{close-port}. The\n" "@code{shutdown} procedure allows reception or transmission on a\n" "connection to be shut down individually, according to the parameter\n" "@var{how}:\n\n" "@table @asis\n" "@item 0\n" "Stop receiving data for this socket. If further data arrives, reject it.\n" "@item 1\n" "Stop trying to transmit data from this socket. Discard any\n" "data waiting to be sent. Stop looking for acknowledgement of\n" "data already sent; don't retransmit it if it is lost.\n" "@item 2\n" "Stop both reception and transmission.\n" "@end table\n\n" "The return value is unspecified.") #define FUNC_NAME s_scm_shutdown { int fd; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); SCM_VALIDATE_INUM (2,how); SCM_ASSERT_RANGE(2,how,0 <= SCM_INUM (how) && 2 >= SCM_INUM (how)); fd = SCM_FPORT_FDES (sock); if (shutdown (fd, SCM_INUM (how)) == -1) SCM_SYSERROR; return SCM_UNSPECIFIED; } #undef FUNC_NAME /* convert fam/address/args into a sockaddr of the appropriate type. args is modified by removing the arguments actually used. which_arg and proc are used when reporting errors: which_arg is the position of address in the original argument list. proc is the name of the original procedure. size returns the size of the structure allocated. */ static struct sockaddr * scm_fill_sockaddr (int fam, SCM address, SCM *args, int which_arg, const char *proc, int *size) #define FUNC_NAME proc { switch (fam) { case AF_INET: { struct sockaddr_in *soka; unsigned long addr; int port; SCM_VALIDATE_ULONG_COPY (which_arg, address, addr); SCM_VALIDATE_CONS (which_arg + 1, *args); SCM_VALIDATE_INUM_COPY (which_arg + 1, SCM_CAR (*args), port); *args = SCM_CDR (*args); soka = (struct sockaddr_in *) malloc (sizeof (struct sockaddr_in)); if (!soka) scm_memory_error (proc); #if HAVE_STRUCT_SOCKADDR_SIN_LEN soka->sin_len = sizeof (struct sockaddr_in); #endif soka->sin_family = AF_INET; soka->sin_addr.s_addr = htonl (addr); soka->sin_port = htons (port); *size = sizeof (struct sockaddr_in); return (struct sockaddr *) soka; } #ifdef HAVE_IPV6 case AF_INET6: { /* see RFC2553. */ int port; struct sockaddr_in6 *soka; unsigned long flowinfo = 0; unsigned long scope_id = 0; VALIDATE_INET6 (which_arg, address); SCM_VALIDATE_CONS (which_arg + 1, *args); SCM_VALIDATE_INUM_COPY (which_arg + 1, SCM_CAR (*args), port); *args = SCM_CDR (*args); if (SCM_CONSP (*args)) { SCM_VALIDATE_ULONG_COPY (which_arg + 2, SCM_CAR (*args), flowinfo); *args = SCM_CDR (*args); if (SCM_CONSP (*args)) { SCM_VALIDATE_ULONG_COPY (which_arg + 3, SCM_CAR (*args), scope_id); *args = SCM_CDR (*args); } } soka = (struct sockaddr_in6 *) malloc (sizeof (struct sockaddr_in6)); if (!soka) scm_memory_error (proc); #if HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN soka->sin6_len = sizeof (struct sockaddr_in6); #endif soka->sin6_family = AF_INET6; ipv6_num_to_net (address, soka->sin6_addr.s6_addr); soka->sin6_port = htons (port); soka->sin6_flowinfo = flowinfo; #ifdef HAVE_SIN6_SCOPE_ID soka->sin6_scope_id = scope_id; #endif *size = sizeof (struct sockaddr_in6); return (struct sockaddr *) soka; } #endif #ifdef HAVE_UNIX_DOMAIN_SOCKETS case AF_UNIX: { struct sockaddr_un *soka; int addr_size; SCM_ASSERT (SCM_STRINGP (address), address, which_arg, proc); /* the static buffer size in sockaddr_un seems to be arbitrary and not necessarily a hard limit. e.g., the glibc manual suggests it may be possible to declare it size 0. let's ignore it. if the O/S doesn't like the size it will cause connect/bind etc., to fail. sun_path is always the last member of the structure. */ addr_size = sizeof (struct sockaddr_un) + max (0, SCM_STRING_LENGTH (address) + 1 - (sizeof soka->sun_path)); soka = (struct sockaddr_un *) malloc (addr_size); if (!soka) scm_memory_error (proc); memset (soka, 0, addr_size); /* for sun_len: see sin_len above. */ soka->sun_family = AF_UNIX; memcpy (soka->sun_path, SCM_STRING_CHARS (address), SCM_STRING_LENGTH (address)); *size = SUN_LEN (soka); return (struct sockaddr *) soka; } #endif default: scm_out_of_range (proc, SCM_MAKINUM (fam)); } } #undef FUNC_NAME SCM_DEFINE (scm_connect, "connect", 3, 0, 1, (SCM sock, SCM fam, SCM address, SCM args), "Initiate a connection from a socket using a specified address\n" "family to the address\n" "specified by @var{address} and possibly @var{args}.\n" "The format required for @var{address}\n" "and @var{args} depends on the family of the socket.\n\n" "For a socket of family @code{AF_UNIX},\n" "only @var{address} is specified and must be a string with the\n" "filename where the socket is to be created.\n\n" "For a socket of family @code{AF_INET},\n" "@var{address} must be an integer IPv4 host address and\n" "@var{args} must be a single integer port number.\n\n" "For a socket of family @code{AF_INET6},\n" "@var{address} must be an integer IPv6 host address and\n" "@var{args} may be up to three integers:\n" "port [flowinfo] [scope_id],\n" "where flowinfo and scope_id default to zero.\n\n" "The return value is unspecified.") #define FUNC_NAME s_scm_connect { int fd; struct sockaddr *soka; int size; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); SCM_VALIDATE_INUM (2,fam); fd = SCM_FPORT_FDES (sock); soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args, 3, FUNC_NAME, &size); if (connect (fd, soka, size) == -1) { int save_errno = errno; free (soka); errno = save_errno; SCM_SYSERROR; } free (soka); return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_bind, "bind", 3, 0, 1, (SCM sock, SCM fam, SCM address, SCM args), "Assign an address to the socket port @var{sock}.\n" "Generally this only needs to be done for server sockets,\n" "so they know where to look for incoming connections. A socket\n" "without an address will be assigned one automatically when it\n" "starts communicating.\n\n" "The format of @var{address} and @var{args} depends\n" "on the family of the socket.\n\n" "For a socket of family @code{AF_UNIX}, only @var{address}\n" "is specified and must be a string with the filename where\n" "the socket is to be created.\n\n" "For a socket of family @code{AF_INET}, @var{address}\n" "must be an integer IPv4 address and @var{args}\n" "must be a single integer port number.\n\n" "The values of the following variables can also be used for\n" "@var{address}:\n\n" "@defvar INADDR_ANY\n" "Allow connections from any address.\n" "@end defvar\n\n" "@defvar INADDR_LOOPBACK\n" "The address of the local host using the loopback device.\n" "@end defvar\n\n" "@defvar INADDR_BROADCAST\n" "The broadcast address on the local network.\n" "@end defvar\n\n" "@defvar INADDR_NONE\n" "No address.\n" "@end defvar\n\n" "For a socket of family @code{AF_INET6}, @var{address}\n" "must be an integer IPv6 address and @var{args}\n" "may be up to three integers:\n" "port [flowinfo] [scope_id],\n" "where flowinfo and scope_id default to zero.\n\n" "The return value is unspecified.") #define FUNC_NAME s_scm_bind { struct sockaddr *soka; int size; int fd; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1, sock); SCM_VALIDATE_INUM (2, fam); soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args, 3, FUNC_NAME, &size); fd = SCM_FPORT_FDES (sock); if (bind (fd, soka, size) == -1) { int save_errno = errno; free (soka); errno = save_errno; SCM_SYSERROR; } free (soka); return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_listen, "listen", 2, 0, 0, (SCM sock, SCM backlog), "Enable @var{sock} to accept connection\n" "requests. @var{backlog} is an integer specifying\n" "the maximum length of the queue for pending connections.\n" "If the queue fills, new clients will fail to connect until\n" "the server calls @code{accept} to accept a connection from\n" "the queue.\n\n" "The return value is unspecified.") #define FUNC_NAME s_scm_listen { int fd; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); SCM_VALIDATE_INUM (2,backlog); fd = SCM_FPORT_FDES (sock); if (listen (fd, SCM_INUM (backlog)) == -1) SCM_SYSERROR; return SCM_UNSPECIFIED; } #undef FUNC_NAME /* Put the components of a sockaddr into a new SCM vector. */ static SCM scm_addr_vector (const struct sockaddr *address, const char *proc) { short int fam = address->sa_family; SCM result; SCM *ve; switch (fam) { case AF_INET: { const struct sockaddr_in *nad = (struct sockaddr_in *) address; result = scm_c_make_vector (3, SCM_UNSPECIFIED); ve = SCM_VELTS (result); ve[0] = scm_ulong2num ((unsigned long) fam); ve[1] = scm_ulong2num (ntohl (nad->sin_addr.s_addr)); ve[2] = scm_ulong2num ((unsigned long) ntohs (nad->sin_port)); } break; #ifdef HAVE_IPV6 case AF_INET6: { const struct sockaddr_in6 *nad = (struct sockaddr_in6 *) address; result = scm_c_make_vector (5, SCM_UNSPECIFIED); ve = SCM_VELTS (result); ve[0] = scm_ulong2num ((unsigned long) fam); ve[1] = ipv6_net_to_num (nad->sin6_addr.s6_addr); ve[2] = scm_ulong2num ((unsigned long) ntohs (nad->sin6_port)); ve[3] = scm_ulong2num ((unsigned long) nad->sin6_flowinfo); #ifdef HAVE_SIN6_SCOPE_ID ve[4] = scm_ulong2num ((unsigned long) nad->sin6_scope_id); #else ve[4] = SCM_INUM0; #endif } break; #endif #ifdef HAVE_UNIX_DOMAIN_SOCKETS case AF_UNIX: { const struct sockaddr_un *nad = (struct sockaddr_un *) address; result = scm_c_make_vector (2, SCM_UNSPECIFIED); ve = SCM_VELTS (result); ve[0] = scm_ulong2num ((unsigned long) fam); ve[1] = scm_mem2string (nad->sun_path, strlen (nad->sun_path)); } break; #endif default: scm_misc_error (proc, "Unrecognised address family: ~A", scm_list_1 (SCM_MAKINUM (fam))); } return result; } /* calculate the size of a buffer large enough to hold any supported sockaddr type. if the buffer isn't large enough, certain system calls will return a truncated address. */ #if defined (HAVE_UNIX_DOMAIN_SOCKETS) #define MAX_SIZE_UN sizeof (struct sockaddr_un) #else #define MAX_SIZE_UN 0 #endif #if defined (HAVE_IPV6) #define MAX_SIZE_IN6 sizeof (struct sockaddr_in6) #else #define MAX_SIZE_IN6 0 #endif #define MAX_ADDR_SIZE max (max (sizeof (struct sockaddr_in), MAX_SIZE_IN6),\ MAX_SIZE_UN) SCM_DEFINE (scm_accept, "accept", 1, 0, 0, (SCM sock), "Accept a connection on a bound, listening socket.\n" "If there\n" "are no pending connections in the queue, wait until\n" "one is available unless the non-blocking option has been\n" "set on the socket.\n\n" "The return value is a\n" "pair in which the @emph{car} is a new socket port for the\n" "connection and\n" "the @emph{cdr} is an object with address information about the\n" "client which initiated the connection.\n\n" "@var{sock} does not become part of the\n" "connection and will continue to accept new requests.") #define FUNC_NAME s_scm_accept { int fd; int newfd; SCM address; SCM newsock; int addr_size = MAX_ADDR_SIZE; char max_addr[MAX_ADDR_SIZE]; struct sockaddr *addr = (struct sockaddr *) max_addr; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1, sock); fd = SCM_FPORT_FDES (sock); newfd = accept (fd, addr, &addr_size); if (newfd == -1) SCM_SYSERROR; newsock = SCM_SOCK_FD_TO_PORT (newfd); address = scm_addr_vector (addr, FUNC_NAME); return scm_cons (newsock, address); } #undef FUNC_NAME SCM_DEFINE (scm_getsockname, "getsockname", 1, 0, 0, (SCM sock), "Return the address of @var{sock}, in the same form as the\n" "object returned by @code{accept}. On many systems the address\n" "of a socket in the @code{AF_FILE} namespace cannot be read.") #define FUNC_NAME s_scm_getsockname { int fd; int addr_size = MAX_ADDR_SIZE; char max_addr[MAX_ADDR_SIZE]; struct sockaddr *addr = (struct sockaddr *) max_addr; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); fd = SCM_FPORT_FDES (sock); if (getsockname (fd, addr, &addr_size) == -1) SCM_SYSERROR; return scm_addr_vector (addr, FUNC_NAME); } #undef FUNC_NAME SCM_DEFINE (scm_getpeername, "getpeername", 1, 0, 0, (SCM sock), "Return the address that @var{sock}\n" "is connected to, in the same form as the object returned by\n" "@code{accept}. On many systems the address of a socket in the\n" "@code{AF_FILE} namespace cannot be read.") #define FUNC_NAME s_scm_getpeername { int fd; int addr_size = MAX_ADDR_SIZE; char max_addr[MAX_ADDR_SIZE]; struct sockaddr *addr = (struct sockaddr *) max_addr; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); fd = SCM_FPORT_FDES (sock); if (getpeername (fd, addr, &addr_size) == -1) SCM_SYSERROR; return scm_addr_vector (addr, FUNC_NAME); } #undef FUNC_NAME SCM_DEFINE (scm_recv, "recv!", 2, 1, 0, (SCM sock, SCM buf, SCM flags), "Receive data from a socket port.\n" "@var{sock} must already\n" "be bound to the address from which data is to be received.\n" "@var{buf} is a string into which\n" "the data will be written. The size of @var{buf} limits\n" "the amount of\n" "data which can be received: in the case of packet\n" "protocols, if a packet larger than this limit is encountered\n" "then some data\n" "will be irrevocably lost.\n\n" "The optional @var{flags} argument is a value or\n" "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n" "The value returned is the number of bytes read from the\n" "socket.\n\n" "Note that the data is read directly from the socket file\n" "descriptor:\n" "any unread buffered port data is ignored.") #define FUNC_NAME s_scm_recv { int rv; int fd; int flg; SCM_VALIDATE_OPFPORT (1,sock); SCM_VALIDATE_STRING (2,buf); SCM_VALIDATE_INUM_DEF_COPY (3,flags,0,flg); fd = SCM_FPORT_FDES (sock); SCM_SYSCALL (rv = recv (fd, SCM_STRING_CHARS (buf), SCM_STRING_LENGTH (buf), flg)); if (rv == -1) SCM_SYSERROR; return SCM_MAKINUM (rv); } #undef FUNC_NAME SCM_DEFINE (scm_send, "send", 2, 1, 0, (SCM sock, SCM message, SCM flags), "Transmit the string @var{message} on a socket port @var{sock}.\n" "@var{sock} must already be bound to a destination address. The\n" "value returned is the number of bytes transmitted --\n" "it's possible for\n" "this to be less than the length of @var{message}\n" "if the socket is\n" "set to be non-blocking. The optional @var{flags} argument\n" "is a value or\n" "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n" "Note that the data is written directly to the socket\n" "file descriptor:\n" "any unflushed buffered port data is ignored.") #define FUNC_NAME s_scm_send { int rv; int fd; int flg; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_OPFPORT (1,sock); SCM_VALIDATE_STRING (2, message); SCM_VALIDATE_INUM_DEF_COPY (3,flags,0,flg); fd = SCM_FPORT_FDES (sock); SCM_SYSCALL (rv = send (fd, SCM_STRING_CHARS (message), SCM_STRING_LENGTH (message), flg)); if (rv == -1) SCM_SYSERROR; return SCM_MAKINUM (rv); } #undef FUNC_NAME SCM_DEFINE (scm_recvfrom, "recvfrom!", 2, 3, 0, (SCM sock, SCM str, SCM flags, SCM start, SCM end), "Return data from the socket port @var{sock} and also\n" "information about where the data was received from.\n" "@var{sock} must already be bound to the address from which\n" "data is to be received. @code{str}, is a string into which the\n" "data will be written. The size of @var{str} limits the amount\n" "of data which can be received: in the case of packet protocols,\n" "if a packet larger than this limit is encountered then some\n" "data will be irrevocably lost.\n\n" "The optional @var{flags} argument is a value or bitwise OR of\n" "@code{MSG_OOB}, @code{MSG_PEEK}, @code{MSG_DONTROUTE} etc.\n\n" "The value returned is a pair: the @emph{car} is the number of\n" "bytes read from the socket and the @emph{cdr} an address object\n" "in the same form as returned by @code{accept}. The address\n" "will given as @code{#f} if not available, as is usually the\n" "case for stream sockets.\n\n" "The @var{start} and @var{end} arguments specify a substring of\n" "@var{str} to which the data should be written.\n\n" "Note that the data is read directly from the socket file\n" "descriptor: any unread buffered port data is ignored.") #define FUNC_NAME s_scm_recvfrom { int rv; int fd; int flg; char *buf; int offset; int cend; SCM address; int addr_size = MAX_ADDR_SIZE; char max_addr[MAX_ADDR_SIZE]; struct sockaddr *addr = (struct sockaddr *) max_addr; SCM_VALIDATE_OPFPORT (1,sock); fd = SCM_FPORT_FDES (sock); SCM_VALIDATE_SUBSTRING_SPEC_COPY (2, str, buf, 4, start, offset, 5, end, cend); if (SCM_UNBNDP (flags)) flg = 0; else SCM_VALIDATE_ULONG_COPY (3, flags, flg); /* recvfrom will not necessarily return an address. usually nothing is returned for stream sockets. */ addr->sa_family = AF_UNSPEC; SCM_SYSCALL (rv = recvfrom (fd, buf + offset, cend - offset, flg, addr, &addr_size)); if (rv == -1) SCM_SYSERROR; if (addr->sa_family != AF_UNSPEC) address = scm_addr_vector (addr, FUNC_NAME); else address = SCM_BOOL_F; return scm_cons (SCM_MAKINUM (rv), address); } #undef FUNC_NAME SCM_DEFINE (scm_sendto, "sendto", 4, 0, 1, (SCM sock, SCM message, SCM fam, SCM address, SCM args_and_flags), "Transmit the string @var{message} on the socket port\n" "@var{sock}. The\n" "destination address is specified using the @var{fam},\n" "@var{address} and\n" "@var{args_and_flags} arguments, in a similar way to the\n" "@code{connect} procedure. @var{args_and_flags} contains\n" "the usual connection arguments optionally followed by\n" "a flags argument, which is a value or\n" "bitwise OR of MSG_OOB, MSG_PEEK, MSG_DONTROUTE etc.\n\n" "The value returned is the number of bytes transmitted --\n" "it's possible for\n" "this to be less than the length of @var{message} if the\n" "socket is\n" "set to be non-blocking.\n" "Note that the data is written directly to the socket\n" "file descriptor:\n" "any unflushed buffered port data is ignored.") #define FUNC_NAME s_scm_sendto { int rv; int fd; int flg; struct sockaddr *soka; int size; sock = SCM_COERCE_OUTPORT (sock); SCM_VALIDATE_FPORT (1,sock); SCM_VALIDATE_STRING (2, message); SCM_VALIDATE_INUM (3,fam); fd = SCM_FPORT_FDES (sock); soka = scm_fill_sockaddr (SCM_INUM (fam), address, &args_and_flags, 4, FUNC_NAME, &size); if (SCM_NULLP (args_and_flags)) flg = 0; else { SCM_VALIDATE_CONS (5,args_and_flags); flg = SCM_NUM2ULONG (5, SCM_CAR (args_and_flags)); } SCM_SYSCALL (rv = sendto (fd, SCM_STRING_CHARS (message), SCM_STRING_LENGTH (message), flg, soka, size)); if (rv == -1) { int save_errno = errno; free (soka); errno = save_errno; SCM_SYSERROR; } free (soka); return SCM_MAKINUM (rv); } #undef FUNC_NAME void scm_init_socket () { /* protocol families. */ #ifdef AF_UNSPEC scm_c_define ("AF_UNSPEC", SCM_MAKINUM (AF_UNSPEC)); #endif #ifdef AF_UNIX scm_c_define ("AF_UNIX", SCM_MAKINUM (AF_UNIX)); #endif #ifdef AF_INET scm_c_define ("AF_INET", SCM_MAKINUM (AF_INET)); #endif #ifdef AF_INET6 scm_c_define ("AF_INET6", SCM_MAKINUM (AF_INET6)); #endif #ifdef PF_UNSPEC scm_c_define ("PF_UNSPEC", SCM_MAKINUM (PF_UNSPEC)); #endif #ifdef PF_UNIX scm_c_define ("PF_UNIX", SCM_MAKINUM (PF_UNIX)); #endif #ifdef PF_INET scm_c_define ("PF_INET", SCM_MAKINUM (PF_INET)); #endif #ifdef PF_INET6 scm_c_define ("PF_INET6", SCM_MAKINUM (PF_INET6)); #endif /* standard addresses. */ #ifdef INADDR_ANY scm_c_define ("INADDR_ANY", scm_ulong2num (INADDR_ANY)); #endif #ifdef INADDR_BROADCAST scm_c_define ("INADDR_BROADCAST", scm_ulong2num (INADDR_BROADCAST)); #endif #ifdef INADDR_NONE scm_c_define ("INADDR_NONE", scm_ulong2num (INADDR_NONE)); #endif #ifdef INADDR_LOOPBACK scm_c_define ("INADDR_LOOPBACK", scm_ulong2num (INADDR_LOOPBACK)); #endif /* socket types. SOCK_PACKET is deliberately omitted, the GNU/Linux socket(2) and packet(7) man pages advise that it's obsolete and strongly deprecated. */ #ifdef SOCK_STREAM scm_c_define ("SOCK_STREAM", SCM_MAKINUM (SOCK_STREAM)); #endif #ifdef SOCK_DGRAM scm_c_define ("SOCK_DGRAM", SCM_MAKINUM (SOCK_DGRAM)); #endif #ifdef SOCK_SEQPACKET scm_c_define ("SOCK_SEQPACKET", SCM_MAKINUM (SOCK_SEQPACKET)); #endif #ifdef SOCK_RAW scm_c_define ("SOCK_RAW", SCM_MAKINUM (SOCK_RAW)); #endif #ifdef SOCK_RDM scm_c_define ("SOCK_RDM", SCM_MAKINUM (SOCK_RDM)); #endif /* setsockopt level. */ #ifdef SOL_SOCKET scm_c_define ("SOL_SOCKET", SCM_MAKINUM (SOL_SOCKET)); #endif #ifdef SOL_IP scm_c_define ("SOL_IP", SCM_MAKINUM (SOL_IP)); #endif #ifdef SOL_TCP scm_c_define ("SOL_TCP", SCM_MAKINUM (SOL_TCP)); #endif #ifdef SOL_UDP scm_c_define ("SOL_UDP", SCM_MAKINUM (SOL_UDP)); #endif /* setsockopt names. */ #ifdef SO_DEBUG scm_c_define ("SO_DEBUG", SCM_MAKINUM (SO_DEBUG)); #endif #ifdef SO_REUSEADDR scm_c_define ("SO_REUSEADDR", SCM_MAKINUM (SO_REUSEADDR)); #endif #ifdef SO_STYLE scm_c_define ("SO_STYLE", SCM_MAKINUM (SO_STYLE)); #endif #ifdef SO_TYPE scm_c_define ("SO_TYPE", SCM_MAKINUM (SO_TYPE)); #endif #ifdef SO_ERROR scm_c_define ("SO_ERROR", SCM_MAKINUM (SO_ERROR)); #endif #ifdef SO_DONTROUTE scm_c_define ("SO_DONTROUTE", SCM_MAKINUM (SO_DONTROUTE)); #endif #ifdef SO_BROADCAST scm_c_define ("SO_BROADCAST", SCM_MAKINUM (SO_BROADCAST)); #endif #ifdef SO_SNDBUF scm_c_define ("SO_SNDBUF", SCM_MAKINUM (SO_SNDBUF)); #endif #ifdef SO_RCVBUF scm_c_define ("SO_RCVBUF", SCM_MAKINUM (SO_RCVBUF)); #endif #ifdef SO_KEEPALIVE scm_c_define ("SO_KEEPALIVE", SCM_MAKINUM (SO_KEEPALIVE)); #endif #ifdef SO_OOBINLINE scm_c_define ("SO_OOBINLINE", SCM_MAKINUM (SO_OOBINLINE)); #endif #ifdef SO_NO_CHECK scm_c_define ("SO_NO_CHECK", SCM_MAKINUM (SO_NO_CHECK)); #endif #ifdef SO_PRIORITY scm_c_define ("SO_PRIORITY", SCM_MAKINUM (SO_PRIORITY)); #endif #ifdef SO_LINGER scm_c_define ("SO_LINGER", SCM_MAKINUM (SO_LINGER)); #endif /* recv/send options. */ #ifdef MSG_OOB scm_c_define ("MSG_OOB", SCM_MAKINUM (MSG_OOB)); #endif #ifdef MSG_PEEK scm_c_define ("MSG_PEEK", SCM_MAKINUM (MSG_PEEK)); #endif #ifdef MSG_DONTROUTE scm_c_define ("MSG_DONTROUTE", SCM_MAKINUM (MSG_DONTROUTE)); #endif scm_add_feature ("socket"); #include "libguile/socket.x" } /* Local Variables: c-file-style: "gnu" End: */