code.delx.au - pulseaudio/blob - src/util.c

   1 #include <assert.h>
   2 #include <string.h>
   3 #include <stdio.h>
   4 #include <sys/un.h>
   5 #include <netinet/in.h>
   6 #include <fcntl.h>
   7
   8 #include "util.h"
   9
  10 void make_nonblock_fd(int fd) {
  11     int v;
  12
  13     if ((v = fcntl(fd, F_GETFL)) >= 0)
  14         if (!(v & O_NONBLOCK))
  15             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  16 }
  17
  18 void peer_to_string(char *c, size_t l, int fd) {
  19     struct stat st;
  20
  21     assert(c && l && fd >= 0);
  22
  23     if (fstat(fd, &st) < 0) {
  24         snprintf(c, l, "Invalid client fd");
  25         return;
  26     }
  27
  28     if (S_ISSOCK(st.st_mode)) {
  29         union {
  30             struct sockaddr sa;
  31             struct sockaddr_in in;
  32             struct sockaddr_un un;
  33         } sa;
  34         socklen_t sa_len = sizeof(sa);
  35
  36         if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
  37
  38             if (sa.sa.sa_family == AF_INET) {
  39                 uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
  40
  41                 snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
  42                          ip >> 24,
  43                          (ip >> 16) & 0xFF,
  44                          (ip >> 8) & 0xFF,
  45                          ip & 0xFF,
  46                          ntohs(sa.in.sin_port));
  47                 return;
  48             } else if (sa.sa.sa_family == AF_LOCAL) {
  49                 snprintf(c, l, "UNIX client for %s", sa.un.sun_path);
  50                 return;
  51             }
  52
  53         }
  54         snprintf(c, l, "Unknown network client");
  55         return;
  56     } else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
  57         snprintf(c, l, "STDIN/STDOUT client");
  58         return;
  59     }
  60
  61     snprintf(c, l, "Unknown client");
  62 }