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 #include <linux/rtnetlink.h>
  12
  13 #include "l2tpns.h"
  14 #ifdef BGP
  15 #include "bgp.h"
  16 #endif
  17
  18 // format ipv4 addr as a dotted-quad; n chooses one of 4 static buffers
  19 // to use
  20 char *fmtaddr(in_addr_t addr, int n)
  21 {
  22     static char addrs[4][16];
  23     struct in_addr in;
  24
  25     if (n < 0 || n >= 4)
  26         return "";
  27
  28     in.s_addr = addr;
  29     return strcpy(addrs[n], inet_ntoa(in));
  30 }
  31
  32 char *fmtMacAddr(uint8_t *pMacAddr)
  33 {
  34         static char strMAC[2*ETH_ALEN];
  35
  36         sprintf(strMAC, "%02X:%02X:%02X:%02X:%02X:%02X",
  37                         pMacAddr[0], pMacAddr[1], pMacAddr[2],
  38                         pMacAddr[3], pMacAddr[4], pMacAddr[5]);
  39
  40   return strMAC;
  41 }
  42
  43 void *shared_malloc(unsigned int size)
  44 {
  45     void * p;
  46     p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
  47
  48     if (p == MAP_FAILED)
  49         p = NULL;
  50
  51     return p;
  52 }
  53
  54 extern int forked;
  55 extern int cluster_sockfd, tunfd, controlfd, daefd, snoopfd, ifrfd, ifr6fd, rand_fd;
  56 extern int pppoediscfd, pppoesessfd;
  57 extern int *radfds;
  58 extern int udpfd[MAX_UDPFD + 1];
  59
  60 pid_t fork_and_close()
  61 {
  62         pid_t pid = fork();
  63         int i;
  64
  65         if (pid)
  66                 return pid;
  67
  68         forked++;
  69         if (config->scheduler_fifo)
  70         {
  71                 struct sched_param params = {0};
  72                 params.sched_priority = 0;
  73                 if (sched_setscheduler(0, SCHED_OTHER, &params))
  74                 {
  75                         LOG(0, 0, 0, "Error setting scheduler to OTHER after fork: %s\n", strerror(errno));
  76                         LOG(0, 0, 0, "This is probably really really bad.\n");
  77                 }
  78         }
  79
  80         signal(SIGPIPE, SIG_DFL);
  81         signal(SIGCHLD, SIG_DFL);
  82         signal(SIGHUP,  SIG_DFL);
  83         signal(SIGUSR1, SIG_DFL);
  84         signal(SIGQUIT, SIG_DFL);
  85         signal(SIGKILL, SIG_DFL);
  86         signal(SIGTERM, SIG_DFL);
  87
  88         // Close sockets
  89         if (clifd != -1)        close(clifd);
  90         if (cluster_sockfd != -1)       close(cluster_sockfd);
  91         if (tunfd != -1)        close(tunfd);
  92
  93         for (i = 0; i < config->nbudpfd; i++)
  94         {
  95                 if (udpfd[i] != -1)     close(udpfd[i]);
  96         }
  97
  98         if (pppoediscfd != -1)  close(pppoediscfd);
  99         if (pppoediscfd != -1)  close(pppoediscfd);
 100         if (controlfd != -1)    close(controlfd);
 101         if (daefd != -1)        close(daefd);
 102         if (snoopfd != -1)      close(snoopfd);
 103         if (rand_fd != -1)      close(rand_fd);
 104         if (epollfd != -1)      close(epollfd);
 105
 106         for (i = 0; radfds && i < RADIUS_FDS; i++)
 107                 close(radfds[i]);
 108
 109 #ifdef BGP
 110         for (i = 0; i < BGP_NUM_PEERS; i++)
 111                 if (bgp_peers[i].sock != -1)
 112                         close(bgp_peers[i].sock);
 113 #endif /* BGP */
 114
 115     return pid;
 116 }
 117
 118 ssize_t recvfromto(int s, void *buf, size_t len, int flags,
 119         struct sockaddr *from, socklen_t *fromlen, struct in_addr *toaddr)
 120 {
 121         ssize_t r;
 122         struct msghdr msg;
 123         struct cmsghdr *cmsg;
 124         struct iovec vec;
 125         char cbuf[128];
 126
 127         memset(&msg, 0, sizeof(msg));
 128         msg.msg_name = from;
 129         msg.msg_namelen = *fromlen;
 130
 131         vec.iov_base = buf;
 132         vec.iov_len = len;
 133         msg.msg_iov = &vec;
 134         msg.msg_iovlen = 1;
 135         msg.msg_flags = 0;
 136
 137         msg.msg_control = cbuf;
 138         msg.msg_controllen = sizeof(cbuf);
 139
 140         if ((r = recvmsg(s, &msg, flags)) < 0)
 141                 return r;
 142
 143         if (fromlen)
 144                 *fromlen = msg.msg_namelen;
 145
 146         memset(toaddr, 0, sizeof(*toaddr));
 147         for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
 148         {
 149                 if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_PKTINFO)
 150                 {
 151                         struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg);
 152                         memcpy(toaddr, &i->ipi_addr, sizeof(*toaddr));
 153                         break;
 154                 }
 155         }
 156
 157         return r;
 158 }
 159
 160 ssize_t sendtofrom(int s, void const *buf, size_t len, int flags,
 161     struct sockaddr const *to, socklen_t tolen, struct in_addr const *from)
 162 {
 163     struct msghdr msg;
 164     struct cmsghdr *cmsg;
 165     struct iovec vec;
 166     struct in_pktinfo pktinfo;
 167     char cbuf[CMSG_SPACE(sizeof(pktinfo))];
 168
 169     memset(&msg, 0, sizeof(msg));
 170     msg.msg_name = (struct sockaddr *) to;
 171     msg.msg_namelen = tolen;
 172
 173     vec.iov_base = (void *) buf;
 174     vec.iov_len = len;
 175     msg.msg_iov = &vec;
 176     msg.msg_iovlen = 1;
 177     msg.msg_flags = 0;
 178
 179     msg.msg_control = cbuf;
 180     msg.msg_controllen = sizeof(cbuf);
 181
 182     cmsg = CMSG_FIRSTHDR(&msg);
 183     cmsg->cmsg_level = SOL_IP;
 184     cmsg->cmsg_type = IP_PKTINFO;
 185     cmsg->cmsg_len = CMSG_LEN(sizeof(pktinfo));
 186
 187     memset(&pktinfo, 0, sizeof(pktinfo));
 188     memcpy(&pktinfo.ipi_spec_dst, from, sizeof(*from));
 189     memcpy(CMSG_DATA(cmsg), &pktinfo, sizeof(pktinfo));
 190
 191     return sendmsg(s, &msg, flags);
 192 }