From 9a5162c33017bab6677c528189cff5a501f3822a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 9 Aug 2003 16:36:18 +0000
Subject: netlink monitoring aded wireless querying improved

git-svn-id: file:///home/lennart/svn/public/ifplugd/trunk@30 2bf48fe7-cfc1-0310-909f-d9042e1e0fef
---
 src/nlapi.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/nlapi.c

(limited to 'src/nlapi.c')

diff --git a/src/nlapi.c b/src/nlapi.c
new file mode 100644
index 0000000..33b222b
--- /dev/null
+++ b/src/nlapi.c
@@ -0,0 +1,131 @@
+/* $Id: ifplugd.c 1.12 Sat, 01 Feb 2003 03:00:07 +0100 lennart $ */
+
+/*
+ * This file is part of ifplugd.
+ *
+ * ifplugd 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 of the License, or
+ * (at your option) any later version.
+ *
+ * ifplugd 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 ifplugd; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdlib.h>
+
+#include <libdaemon/dlog.h>
+
+#include "nlapi.h"
+
+int nlapi_fd = -1;
+
+struct callback_info {
+    nlapi_callback_t callback;
+    void *userdata;
+    struct callback_info * next;
+};
+
+struct callback_info *callbacks = NULL;
+
+int nlapi_open(uint32_t groups) {
+    struct sockaddr_nl addr;
+
+    if ((nlapi_fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
+        fprintf(stderr, "socket(PF_NETLINK): %s\n", strerror(errno));
+        return -1;
+    }
+
+    memset(&addr, 0, sizeof(addr));
+    addr.nl_family = AF_NETLINK;
+    addr.nl_groups = groups;
+    addr.nl_pid = getpid();
+
+    if (bind(nlapi_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+        close(nlapi_fd);
+        fprintf(stderr, "bind(): %s\n", strerror(errno));
+        return -1;
+    }
+
+    return 0;
+}
+
+int nlapi_work(int block) {
+
+    assert(nlapi_fd >= 0);
+    
+    for (;;) {
+        int bytes;
+        char replybuf[1024];
+        struct nlmsghdr *p = (struct nlmsghdr *) replybuf;
+        
+        if ((bytes = recv(nlapi_fd, &replybuf, sizeof(replybuf), block ? 0 : MSG_DONTWAIT)) < 0) {
+
+            if (errno == EAGAIN || errno == EINTR)
+                return 0;
+            
+            daemon_log(LOG_ERR, "NLAPI: recv(): %s\n", strerror(errno));
+            return -1;
+        }
+
+        for (; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
+            struct callback_info *c;
+            
+            if (!NLMSG_OK(p, bytes) || bytes < sizeof(struct nlmsghdr) || bytes < p->nlmsg_len) {
+                daemon_log(LOG_ERR, "NLAPI: Packet too small or truncated!\n");
+                return -1;
+            }
+            
+            for (c = callbacks; c; c = c->next)
+                if (c->callback(p, c->userdata) < 0)
+                    return -1;
+        }
+
+        if (block)
+            break;
+    }
+
+    return 0;
+}
+
+void nlapi_close(void) {
+    if (nlapi_fd >= 0)
+        close(nlapi_fd);
+    nlapi_fd = -1;
+
+
+    while (callbacks) {
+        struct callback_info *c = callbacks;
+        callbacks = callbacks->next;
+        free(c);
+    }
+}
+
+int nlapi_register(int (*callback) (struct nlmsghdr *n, void *u), void *u) {
+    struct callback_info *c;
+
+    assert(callback);
+    
+    if (!(c = malloc(sizeof(struct callback_info)))) {
+        daemon_log(LOG_ERR, "NLAPI: Not enough memory.\n");
+        return -1;
+    }
+
+    c->callback = callback;
+    c->userdata = u;
+
+    c->next = callbacks;
+    callbacks = c;
+    return 0;
+}
-- 
cgit