Imported Upstream version 2.1.21

util.c

@@ -0,0 +1,175 @@
+/* Misc util functions */
+
+char const *cvs_id_util = "$Id: util.c,v 1.14 2006/04/05 01:45:57 bodea Exp $";
+
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include "l2tpns.h"
+#ifdef BGP
+#include "bgp.h"
+#endif
+
+// format ipv4 addr as a dotted-quad; n chooses one of 4 static buffers
+// to use
+char *fmtaddr(in_addr_t addr, int n)
+{
+    static char addrs[4][16];
+    struct in_addr in;
+
+    if (n < 0 || n >= 4)
+	return "";
+
+    in.s_addr = addr;
+    return strcpy(addrs[n], inet_ntoa(in));
+}
+
+void *shared_malloc(unsigned int size)
+{
+    void * p;
+    p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+
+    if (p == MAP_FAILED)
+	p = NULL;
+
+    return p;
+}
+
+extern int forked;
+extern int cluster_sockfd, tunfd, udpfd, controlfd, daefd, snoopfd, ifrfd, ifr6fd, rand_fd;
+extern int *radfds;
+
+pid_t fork_and_close()
+{
+    pid_t pid = fork();
+    int i;
+
+    if (pid)
+	return pid;
+
+    forked++;
+    if (config->scheduler_fifo)
+    {
+	struct sched_param params = {0};
+	params.sched_priority = 0;
+	if (sched_setscheduler(0, SCHED_OTHER, &params))
+	{
+	    LOG(0, 0, 0, "Error setting scheduler to OTHER after fork: %s\n", strerror(errno));
+	    LOG(0, 0, 0, "This is probably really really bad.\n");
+	}
+    }
+
+    signal(SIGPIPE, SIG_DFL);
+    signal(SIGCHLD, SIG_DFL);
+    signal(SIGHUP,  SIG_DFL);
+    signal(SIGUSR1, SIG_DFL);
+    signal(SIGQUIT, SIG_DFL);
+    signal(SIGKILL, SIG_DFL);
+    signal(SIGTERM, SIG_DFL);
+
+    // Close sockets
+    if (clifd != -1)          close(clifd);
+    if (cluster_sockfd != -1) close(cluster_sockfd);
+    if (tunfd != -1)          close(tunfd);
+    if (udpfd != -1)          close(udpfd);
+    if (controlfd != -1)      close(controlfd);
+    if (daefd != -1)          close(daefd);
+    if (snoopfd != -1)        close(snoopfd);
+    if (ifrfd != -1)          close(ifrfd);
+    if (ifr6fd != -1)         close(ifr6fd);
+    if (rand_fd != -1)        close(rand_fd);
+    if (epollfd != -1)        close(epollfd);
+
+    for (i = 0; radfds && i < RADIUS_FDS; i++)
+	close(radfds[i]);
+
+#ifdef BGP
+    for (i = 0; i < BGP_NUM_PEERS; i++)
+	if (bgp_peers[i].sock != -1)
+	    close(bgp_peers[i].sock);
+#endif /* BGP */
+
+    return pid;
+}
+
+ssize_t recvfromto(int s, void *buf, size_t len, int flags,
+    struct sockaddr *from, socklen_t *fromlen, struct in_addr *toaddr)
+{
+    ssize_t r;
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    struct iovec vec;
+    char cbuf[128];
+
+    memset(&msg, 0, sizeof(msg));
+    msg.msg_name = from;
+    msg.msg_namelen = *fromlen;
+
+    vec.iov_base = buf;
+    vec.iov_len = len;
+    msg.msg_iov = &vec;
+    msg.msg_iovlen = 1;
+    msg.msg_flags = 0;
+
+    msg.msg_control = cbuf;
+    msg.msg_controllen = sizeof(cbuf);
+
+    if ((r = recvmsg(s, &msg, flags)) < 0)
+    	return r;
+
+    if (fromlen)
+	*fromlen = msg.msg_namelen;
+
+    memset(toaddr, 0, sizeof(*toaddr));
+    for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
+    {
+	if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_PKTINFO)
+	{
+	    struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg);
+	    memcpy(toaddr, &i->ipi_addr, sizeof(*toaddr));
+	    break;
+	}
+    }
+
+    return r;
+}
+
+ssize_t sendtofrom(int s, void const *buf, size_t len, int flags,
+    struct sockaddr const *to, socklen_t tolen, struct in_addr const *from)
+{
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    struct iovec vec;
+    struct in_pktinfo pktinfo;
+    char cbuf[CMSG_SPACE(sizeof(pktinfo))];
+
+    memset(&msg, 0, sizeof(msg));
+    msg.msg_name = (struct sockaddr *) to;
+    msg.msg_namelen = tolen;
+
+    vec.iov_base = (void *) buf;
+    vec.iov_len = len;
+    msg.msg_iov = &vec;
+    msg.msg_iovlen = 1;
+    msg.msg_flags = 0;
+
+    msg.msg_control = cbuf;
+    msg.msg_controllen = sizeof(cbuf);
+
+    cmsg = CMSG_FIRSTHDR(&msg);
+    cmsg->cmsg_level = SOL_IP;
+    cmsg->cmsg_type = IP_PKTINFO;
+    cmsg->cmsg_len = CMSG_LEN(sizeof(pktinfo));
+
+    memset(&pktinfo, 0, sizeof(pktinfo));
+    memcpy(&pktinfo.ipi_spec_dst, from, sizeof(*from));
+    memcpy(CMSG_DATA(cmsg), &pktinfo, sizeof(pktinfo));
+
+    return sendmsg(s, &msg, flags);
+}