util.c

   1 /* Misc util functions */
   2
   3 #include <unistd.h>
   4 #include <errno.h>
   5 #include <sched.h>
   6 #include <sys/socket.h>
   7 #include <netinet/in.h>
   8 #include <arpa/inet.h>
   9 #include <string.h>
  10 #include <sys/mman.h>
  11
  12 #include "l2tpns.h"
  13 #ifdef BGP
  14 #include "bgp.h"
  15 #endif
  16
  17 // format ipv4 addr as a dotted-quad; n chooses one of 4 static buffers
  18 // to use
  19 char *fmtaddr(in_addr_t addr, int n)
  20 {
  21     static char addrs[4][16];
  22     struct in_addr in;
  23
  24     if (n < 0 || n >= 4)
  25         return "";
  26
  27     in.s_addr = addr;
  28     return strcpy(addrs[n], inet_ntoa(in));
  29 }
  30
  31 char *fmtMacAddr(uint8_t *pMacAddr)
  32 {
  33         static char strMAC[2*ETH_ALEN];
  34
  35         sprintf(strMAC, "%02X:%02X:%02X:%02X:%02X:%02X",
  36                         pMacAddr[0], pMacAddr[1], pMacAddr[2],
  37                         pMacAddr[3], pMacAddr[4], pMacAddr[5]);
  38
  39   return strMAC;
  40 }
  41
  42 void *shared_malloc(unsigned int size)
  43 {
  44     void * p;
  45     p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
  46
  47     if (p == MAP_FAILED)
  48         p = NULL;
  49
  50     return p;
  51 }
  52
  53 extern int forked;
  54 extern int cluster_sockfd, tunfd, udpfd, controlfd, daefd, snoopfd, ifrfd, ifr6fd, rand_fd;
  55 extern int *radfds;
  56
  57 pid_t fork_and_close()
  58 {
  59     pid_t pid = fork();
  60     int i;
  61
  62     if (pid)
  63         return pid;
  64
  65     forked++;
  66     if (config->scheduler_fifo)
  67     {
  68         struct sched_param params = {0};
  69         params.sched_priority = 0;
  70         if (sched_setscheduler(0, SCHED_OTHER, &params))
  71         {
  72             LOG(0, 0, 0, "Error setting scheduler to OTHER after fork: %s\n", strerror(errno));
  73             LOG(0, 0, 0, "This is probably really really bad.\n");
  74         }
  75     }
  76
  77     signal(SIGPIPE, SIG_DFL);
  78     signal(SIGCHLD, SIG_DFL);
  79     signal(SIGHUP,  SIG_DFL);
  80     signal(SIGUSR1, SIG_DFL);
  81     signal(SIGQUIT, SIG_DFL);
  82     signal(SIGKILL, SIG_DFL);
  83     signal(SIGTERM, SIG_DFL);
  84
  85     // Close sockets
  86     if (clifd != -1)          close(clifd);
  87     if (cluster_sockfd != -1) close(cluster_sockfd);
  88     if (tunfd != -1)          close(tunfd);
  89     if (udpfd != -1)          close(udpfd);
  90     if (controlfd != -1)      close(controlfd);
  91     if (daefd != -1)          close(daefd);
  92     if (snoopfd != -1)        close(snoopfd);
  93     if (rand_fd != -1)        close(rand_fd);
  94     if (epollfd != -1)        close(epollfd);
  95
  96     for (i = 0; radfds && i < RADIUS_FDS; i++)
  97         close(radfds[i]);
  98
  99 #ifdef BGP
 100     for (i = 0; i < BGP_NUM_PEERS; i++)
 101         if (bgp_peers[i].sock != -1)
 102             close(bgp_peers[i].sock);
 103 #endif /* BGP */
 104
 105     return pid;
 106 }
 107
 108 ssize_t recvfromto(int s, void *buf, size_t len, int flags,
 109     struct sockaddr *from, socklen_t *fromlen, struct in_addr *toaddr)
 110 {
 111     ssize_t r;
 112     struct msghdr msg;
 113     struct cmsghdr *cmsg;
 114     struct iovec vec;
 115     char cbuf[128];
 116
 117     memset(&msg, 0, sizeof(msg));
 118     msg.msg_name = from;
 119     msg.msg_namelen = *fromlen;
 120
 121     vec.iov_base = buf;
 122     vec.iov_len = len;
 123     msg.msg_iov = &vec;
 124     msg.msg_iovlen = 1;
 125     msg.msg_flags = 0;
 126
 127     msg.msg_control = cbuf;
 128     msg.msg_controllen = sizeof(cbuf);
 129
 130     if ((r = recvmsg(s, &msg, flags)) < 0)
 131         return r;
 132
 133     if (fromlen)
 134         *fromlen = msg.msg_namelen;
 135
 136     memset(toaddr, 0, sizeof(*toaddr));
 137     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
 138     {
 139         if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_PKTINFO)
 140         {
 141             struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg);
 142             memcpy(toaddr, &i->ipi_addr, sizeof(*toaddr));
 143             break;
 144         }
 145     }
 146
 147     return r;
 148 }
 149
 150 ssize_t sendtofrom(int s, void const *buf, size_t len, int flags,
 151     struct sockaddr const *to, socklen_t tolen, struct in_addr const *from)
 152 {
 153     struct msghdr msg;
 154     struct cmsghdr *cmsg;
 155     struct iovec vec;
 156     struct in_pktinfo pktinfo;
 157     char cbuf[CMSG_SPACE(sizeof(pktinfo))];
 158
 159     memset(&msg, 0, sizeof(msg));
 160     msg.msg_name = (struct sockaddr *) to;
 161     msg.msg_namelen = tolen;
 162
 163     vec.iov_base = (void *) buf;
 164     vec.iov_len = len;
 165     msg.msg_iov = &vec;
 166     msg.msg_iovlen = 1;
 167     msg.msg_flags = 0;
 168
 169     msg.msg_control = cbuf;
 170     msg.msg_controllen = sizeof(cbuf);
 171
 172     cmsg = CMSG_FIRSTHDR(&msg);
 173     cmsg->cmsg_level = SOL_IP;
 174     cmsg->cmsg_type = IP_PKTINFO;
 175     cmsg->cmsg_len = CMSG_LEN(sizeof(pktinfo));
 176
 177     memset(&pktinfo, 0, sizeof(pktinfo));
 178     memcpy(&pktinfo.ipi_spec_dst, from, sizeof(*from));
 179     memcpy(CMSG_DATA(cmsg), &pktinfo, sizeof(pktinfo));
 180
 181     return sendmsg(s, &msg, flags);
 182 }