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https://github.com/servalproject/serval-dna.git
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c4f19f8a82
All platforms except Android use normal sockets (although this is easy to change and the choice is keyed off a single define). This gives consistent handling to unix domain sockets which were previously a mishmash where some were always normal, some always abstract and some chose (but in different ways). It also gives consistent error checking. Doesn't pass tests yet though.
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
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Copyright (C) 2012 Daniel O'Connor, Serval Project.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#include <stdio.h>
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#include <strings.h>
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#include <sys/errno.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <sys/un.h>
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#include <unistd.h>
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#include "serval.h"
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#include "socket.h"
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/* Create a socket and bind it to name in the abstract namespace for android or
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* $SERVALINSTANCE_PATH/name for everything else.
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*
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* Use abstract namespace as Android has no writable FS which supports sockets.
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* Don't use it for anything else because it makes testing harder (as we can't run
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* more than one servald on a given system.
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*/
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int
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socket_bind(const char *name) {
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int s, oerrno;
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struct sockaddr_un sockname;
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socklen_t len;
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if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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return -1;
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socket_setname(&sockname, name, &len);
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unlink(sockname.sun_path);
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if (bind(s, (struct sockaddr *)&sockname, len) == -1) {
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oerrno = errno;
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close(s);
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errno = oerrno;
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return -1;
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}
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return s;
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}
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/* Set sockname to name handling abstract name space sockets etc. */
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void
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socket_setname(struct sockaddr_un *sockname, const char *name, socklen_t *len) {
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bzero(sockname, sizeof(*sockname));
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sockname->sun_family = AF_UNIX;
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#ifdef USE_ABSTRACT_NAMESPACE
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sockname->sun_path[0] = 0;
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/* Note: -2 here not -1 because sprintf will put the trailling nul in */
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*len = snprintf(sockname->sun_path + 1, sizeof(sockname->sun_path) - 2, "%s", name);
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if (*len > sizeof(sockname->sun_path) - 2)
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FATALF("Socket path too long (%d > %d)", *len, sizeof(sockname->sun_path) - 2);
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/* Doesn't include trailing nul */
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*len = 1 + strlen(sockname->sun_path + 1) + sizeof(sockname->sun_family);
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#else
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*len = snprintf(sockname->sun_path, sizeof(sockname->sun_path) - 1, "%s/%s",
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serval_instancepath(), name);
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if (*len > sizeof(sockname->sun_path) - 1)
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FATALF("Socket path too long (%d > %d)", *len, sizeof(sockname->sun_path) - 1);
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#ifdef SUN_LEN
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*len = SUN_LEN(sockname);
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#else
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/* Includes trailing nul */
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*len = 1 + strlen(sockname->sun_path) + sizeof(sockname->sun_family);
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#endif
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#endif
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}
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/* Cleanup socket opened by socket_bind */
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void
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socket_done(const char *name) {
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#ifndef USE_ABSTRACT_NAMESPACE
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struct sockaddr_un sockname;
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socklen_t len;
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socket_setname(&sockname, name, &len);
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unlink(sockname.sun_path);
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#endif
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}
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