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-rw-r--r--lib/sh/netopen.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/lib/sh/netopen.c b/lib/sh/netopen.c
new file mode 100644
index 0000000..ee0baf6
--- /dev/null
+++ b/lib/sh/netopen.c
@@ -0,0 +1,351 @@
+/*
+ * netopen.c -- functions to make tcp/udp connections
+ *
+ * Chet Ramey
+ * chet@ins.CWRU.Edu
+ */
+
+/* Copyright (C) 1987-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash 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 3 of the License, or
+ (at your option) any later version.
+
+ Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HAVE_NETWORK)
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#if defined (HAVE_SYS_SOCKET_H)
+# include <sys/socket.h>
+#endif
+
+#if defined (HAVE_NETINET_IN_H)
+# include <netinet/in.h>
+#endif
+
+#if defined (HAVE_NETDB_H)
+# include <netdb.h>
+#endif
+
+#if defined (HAVE_ARPA_INET_H)
+# include <arpa/inet.h>
+#endif
+
+#include <bashansi.h>
+#include <bashintl.h>
+
+#include <errno.h>
+
+#include <shell.h>
+#include <xmalloc.h>
+
+#ifndef errno
+extern int errno;
+#endif
+
+#if !defined (HAVE_INET_ATON)
+extern int inet_aton PARAMS((const char *, struct in_addr *));
+#endif
+
+#ifndef HAVE_GETADDRINFO
+static int _getaddr PARAMS((char *, struct in_addr *));
+static int _getserv PARAMS((char *, int, unsigned short *));
+static int _netopen4 PARAMS((char *, char *, int));
+#else /* HAVE_GETADDRINFO */
+static int _netopen6 PARAMS((char *, char *, int));
+#endif
+
+static int _netopen PARAMS((char *, char *, int));
+
+#ifndef HAVE_GETADDRINFO
+/* Stuff the internet address corresponding to HOST into AP, in network
+ byte order. Return 1 on success, 0 on failure. */
+
+static int
+_getaddr (host, ap)
+ char *host;
+ struct in_addr *ap;
+{
+ struct hostent *h;
+ int r;
+
+ r = 0;
+ if (host[0] >= '0' && host[0] <= '9')
+ {
+ /* If the first character is a digit, guess that it's an
+ Internet address and return immediately if inet_aton succeeds. */
+ r = inet_aton (host, ap);
+ if (r)
+ return r;
+ }
+#if !defined (HAVE_GETHOSTBYNAME)
+ return 0;
+#else
+ h = gethostbyname (host);
+ if (h && h->h_addr)
+ {
+ bcopy(h->h_addr, (char *)ap, h->h_length);
+ return 1;
+ }
+#endif
+ return 0;
+
+}
+
+/* Return 1 if SERV is a valid port number and stuff the converted value into
+ PP in network byte order. */
+static int
+_getserv (serv, proto, pp)
+ char *serv;
+ int proto;
+ unsigned short *pp;
+{
+ intmax_t l;
+ unsigned short s;
+
+ if (legal_number (serv, &l))
+ {
+ s = (unsigned short)(l & 0xFFFF);
+ if (s != l)
+ return (0);
+ s = htons (s);
+ if (pp)
+ *pp = s;
+ return 1;
+ }
+ else
+#if defined (HAVE_GETSERVBYNAME)
+ {
+ struct servent *se;
+
+ se = getservbyname (serv, (proto == 't') ? "tcp" : "udp");
+ if (se == 0)
+ return 0;
+ if (pp)
+ *pp = se->s_port; /* ports returned in network byte order */
+ return 1;
+ }
+#else /* !HAVE_GETSERVBYNAME */
+ return 0;
+#endif /* !HAVE_GETSERVBYNAME */
+}
+
+/*
+ * Open a TCP or UDP connection to HOST on port SERV. Uses the
+ * traditional BSD mechanisms. Returns the connected socket or -1 on error.
+ */
+static int
+_netopen4(host, serv, typ)
+ char *host, *serv;
+ int typ;
+{
+ struct in_addr ina;
+ struct sockaddr_in sin;
+ unsigned short p;
+ int s, e;
+
+ if (_getaddr(host, &ina) == 0)
+ {
+ internal_error (_("%s: host unknown"), host);
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (_getserv(serv, typ, &p) == 0)
+ {
+ internal_error(_("%s: invalid service"), serv);
+ errno = EINVAL;
+ return -1;
+ }
+
+ memset ((char *)&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_port = p;
+ sin.sin_addr = ina;
+
+ s = socket(AF_INET, (typ == 't') ? SOCK_STREAM : SOCK_DGRAM, 0);
+ if (s < 0)
+ {
+ sys_error ("socket");
+ return (-1);
+ }
+
+ if (connect (s, (struct sockaddr *)&sin, sizeof (sin)) < 0)
+ {
+ e = errno;
+ sys_error("connect");
+ close(s);
+ errno = e;
+ return (-1);
+ }
+
+ return(s);
+}
+#endif /* ! HAVE_GETADDRINFO */
+
+#ifdef HAVE_GETADDRINFO
+/*
+ * Open a TCP or UDP connection to HOST on port SERV. Uses getaddrinfo(3)
+ * which provides support for IPv6. Returns the connected socket or -1
+ * on error.
+ */
+static int
+_netopen6 (host, serv, typ)
+ char *host, *serv;
+ int typ;
+{
+ int s, e;
+ struct addrinfo hints, *res, *res0;
+ int gerr;
+
+ memset ((char *)&hints, 0, sizeof (hints));
+ /* XXX -- if problems with IPv6, set to PF_INET for IPv4 only */
+#ifdef DEBUG /* PF_INET is the one that works for me */
+ hints.ai_family = PF_INET;
+#else
+ hints.ai_family = PF_UNSPEC;
+#endif
+ hints.ai_socktype = (typ == 't') ? SOCK_STREAM : SOCK_DGRAM;
+
+ gerr = getaddrinfo (host, serv, &hints, &res0);
+ if (gerr)
+ {
+ if (gerr == EAI_SERVICE)
+ internal_error ("%s: %s", serv, gai_strerror (gerr));
+ else
+ internal_error ("%s: %s", host, gai_strerror (gerr));
+ errno = EINVAL;
+ return -1;
+ }
+
+ for (res = res0; res; res = res->ai_next)
+ {
+ if ((s = socket (res->ai_family, res->ai_socktype, res->ai_protocol)) < 0)
+ {
+ if (res->ai_next)
+ continue;
+ sys_error ("socket");
+ freeaddrinfo (res0);
+ return -1;
+ }
+ if (connect (s, res->ai_addr, res->ai_addrlen) < 0)
+ {
+ if (res->ai_next)
+ {
+ close (s);
+ continue;
+ }
+ e = errno;
+ sys_error ("connect");
+ close (s);
+ freeaddrinfo (res0);
+ errno = e;
+ return -1;
+ }
+ freeaddrinfo (res0);
+ break;
+ }
+ return s;
+}
+#endif /* HAVE_GETADDRINFO */
+
+/*
+ * Open a TCP or UDP connection to HOST on port SERV. Uses getaddrinfo(3)
+ * if available, falling back to the traditional BSD mechanisms otherwise.
+ * Returns the connected socket or -1 on error.
+ */
+static int
+_netopen(host, serv, typ)
+ char *host, *serv;
+ int typ;
+{
+#ifdef HAVE_GETADDRINFO
+ return (_netopen6 (host, serv, typ));
+#else
+ return (_netopen4 (host, serv, typ));
+#endif
+}
+
+/*
+ * Open a TCP or UDP connection given a path like `/dev/tcp/host/port' to
+ * host `host' on port `port' and return the connected socket.
+ */
+int
+netopen (path)
+ char *path;
+{
+ char *np, *s, *t;
+ int fd;
+
+ np = (char *)xmalloc (strlen (path) + 1);
+ strcpy (np, path);
+
+ s = np + 9;
+ t = strchr (s, '/');
+ if (t == 0)
+ {
+ internal_error (_("%s: bad network path specification"), path);
+ free (np);
+ return -1;
+ }
+ *t++ = '\0';
+ fd = _netopen (s, t, path[5]);
+ free (np);
+
+ return fd;
+}
+
+#if 0
+/*
+ * Open a TCP connection to host `host' on the port defined for service
+ * `serv' and return the connected socket.
+ */
+int
+tcpopen (host, serv)
+ char *host, *serv;
+{
+ return (_netopen (host, serv, 't'));
+}
+
+/*
+ * Open a UDP connection to host `host' on the port defined for service
+ * `serv' and return the connected socket.
+ */
+int
+udpopen (host, serv)
+ char *host, *serv;
+{
+ return _netopen (host, serv, 'u');
+}
+#endif
+
+#else /* !HAVE_NETWORK */
+
+int
+netopen (path)
+ char *path;
+{
+ internal_error (_("network operations not supported"));
+ return -1;
+}
+
+#endif /* !HAVE_NETWORK */