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, controlfd, daefd, snoopfd, ifrfd, ifr6fd, rand_fd;
  55 extern int pppoediscfd, pppoesessfd;
  56 extern int *radfds;
  57 extern int udpfd[MAX_UDPFD + 1];
  58
  59 pid_t fork_and_close()
  60 {
  61         pid_t pid = fork();
  62         int i;
  63
  64         if (pid)
  65                 return pid;
  66
  67         forked++;
  68         if (config->scheduler_fifo)
  69         {
  70                 struct sched_param params = {0};
  71                 params.sched_priority = 0;
  72                 if (sched_setscheduler(0, SCHED_OTHER, &params))
  73                 {
  74                         LOG(0, 0, 0, "Error setting scheduler to OTHER after fork: %s\n", strerror(errno));
  75                         LOG(0, 0, 0, "This is probably really really bad.\n");
  76                 }
  77         }
  78
  79         signal(SIGPIPE, SIG_DFL);
  80         signal(SIGCHLD, SIG_DFL);
  81         signal(SIGHUP,  SIG_DFL);
  82         signal(SIGUSR1, SIG_DFL);
  83         signal(SIGQUIT, SIG_DFL);
  84         signal(SIGKILL, SIG_DFL);
  85         signal(SIGTERM, SIG_DFL);
  86
  87         // Close sockets
  88         if (clifd != -1)        close(clifd);
  89         if (cluster_sockfd != -1)       close(cluster_sockfd);
  90         if (tunfd != -1)        close(tunfd);
  91
  92         for (i = 0; i < config->nbudpfd; i++)
  93         {
  94                 if (udpfd[i] != -1)     close(udpfd[i]);
  95         }
  96
  97         if (pppoediscfd != -1)  close(pppoediscfd);
  98         if (pppoediscfd != -1)  close(pppoediscfd);
  99         if (controlfd != -1)    close(controlfd);
 100         if (daefd != -1)        close(daefd);
 101         if (snoopfd != -1)      close(snoopfd);
 102         if (rand_fd != -1)      close(rand_fd);
 103         if (epollfd != -1)      close(epollfd);
 104
 105         for (i = 0; radfds && i < RADIUS_FDS; i++)
 106                 close(radfds[i]);
 107
 108 #ifdef BGP
 109         for (i = 0; i < BGP_NUM_PEERS; i++)
 110                 if (bgp_peers[i].sock != -1)
 111                         close(bgp_peers[i].sock);
 112 #endif /* BGP */
 113
 114     return pid;
 115 }
 116
 117 ssize_t recvfromto(int s, void *buf, size_t len, int flags,
 118         struct sockaddr *from, socklen_t *fromlen, struct in_addr *toaddr)
 119 {
 120         ssize_t r;
 121         struct msghdr msg;
 122         struct cmsghdr *cmsg;
 123         struct iovec vec;
 124         char cbuf[128];
 125
 126         memset(&msg, 0, sizeof(msg));
 127         msg.msg_name = from;
 128         msg.msg_namelen = *fromlen;
 129
 130         vec.iov_base = buf;
 131         vec.iov_len = len;
 132         msg.msg_iov = &vec;
 133         msg.msg_iovlen = 1;
 134         msg.msg_flags = 0;
 135
 136         msg.msg_control = cbuf;
 137         msg.msg_controllen = sizeof(cbuf);
 138
 139         if ((r = recvmsg(s, &msg, flags)) < 0)
 140                 return r;
 141
 142         if (fromlen)
 143                 *fromlen = msg.msg_namelen;
 144
 145         memset(toaddr, 0, sizeof(*toaddr));
 146         for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
 147         {
 148                 if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_PKTINFO)
 149                 {
 150                         struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg);
 151                         memcpy(toaddr, &i->ipi_addr, sizeof(*toaddr));
 152                         break;
 153                 }
 154         }
 155
 156         return r;
 157 }
 158
 159 ssize_t sendtofrom(int s, void const *buf, size_t len, int flags,
 160     struct sockaddr const *to, socklen_t tolen, struct in_addr const *from)
 161 {
 162     struct msghdr msg;
 163     struct cmsghdr *cmsg;
 164     struct iovec vec;
 165     struct in_pktinfo pktinfo;
 166     char cbuf[CMSG_SPACE(sizeof(pktinfo))];
 167
 168     memset(&msg, 0, sizeof(msg));
 169     msg.msg_name = (struct sockaddr *) to;
 170     msg.msg_namelen = tolen;
 171
 172     vec.iov_base = (void *) buf;
 173     vec.iov_len = len;
 174     msg.msg_iov = &vec;
 175     msg.msg_iovlen = 1;
 176     msg.msg_flags = 0;
 177
 178     msg.msg_control = cbuf;
 179     msg.msg_controllen = sizeof(cbuf);
 180
 181     cmsg = CMSG_FIRSTHDR(&msg);
 182     cmsg->cmsg_level = SOL_IP;
 183     cmsg->cmsg_type = IP_PKTINFO;
 184     cmsg->cmsg_len = CMSG_LEN(sizeof(pktinfo));
 185
 186     memset(&pktinfo, 0, sizeof(pktinfo));
 187     memcpy(&pktinfo.ipi_spec_dst, from, sizeof(*from));
 188     memcpy(CMSG_DATA(cmsg), &pktinfo, sizeof(pktinfo));
 189
 190     return sendmsg(s, &msg, flags);
 191 }