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

   1 #include <stdarg.h>
   2 #include <stdlib.h>
   3 #include <signal.h>
   4 #include <errno.h>
   5 #include <assert.h>
   6 #include <string.h>
   7 #include <stdio.h>
   8 #include <sys/un.h>
   9 #include <netinet/in.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <sys/types.h>
  13 #include <netinet/tcp.h>
  14 #include <netinet/ip.h>
  15
  16 #include "socket-util.h"
  17 #include "util.h"
  18
  19 void pa_socket_peer_to_string(int fd, char *c, size_t l) {
  20     struct stat st;
  21
  22     assert(c && l && fd >= 0);
  23
  24     if (fstat(fd, &st) < 0) {
  25         snprintf(c, l, "Invalid client fd");
  26         return;
  27     }
  28
  29     if (S_ISSOCK(st.st_mode)) {
  30         union {
  31             struct sockaddr sa;
  32             struct sockaddr_in in;
  33             struct sockaddr_un un;
  34         } sa;
  35         socklen_t sa_len = sizeof(sa);
  36
  37         if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
  38
  39             if (sa.sa.sa_family == AF_INET) {
  40                 uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
  41
  42                 snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
  43                          ip >> 24,
  44                          (ip >> 16) & 0xFF,
  45                          (ip >> 8) & 0xFF,
  46                          ip & 0xFF,
  47                          ntohs(sa.in.sin_port));
  48                 return;
  49             } else if (sa.sa.sa_family == AF_LOCAL) {
  50                 snprintf(c, l, "UNIX socket client");
  51                 return;
  52             }
  53
  54         }
  55         snprintf(c, l, "Unknown network client");
  56         return;
  57     } else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
  58         snprintf(c, l, "STDIN/STDOUT client");
  59         return;
  60     }
  61
  62     snprintf(c, l, "Unknown client");
  63 }
  64
  65 int pa_socket_low_delay(int fd) {
  66     int priority;
  67     assert(fd >= 0);
  68
  69     priority = 7;
  70     if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < 0)
  71         return -1;
  72
  73     return 0;
  74 }
  75
  76 int pa_socket_tcp_low_delay(int fd) {
  77     int ret, tos;
  78
  79     assert(fd >= 0);
  80
  81     ret = pa_socket_low_delay(fd);
  82
  83 /*     on = 1; */
  84 /*     if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) */
  85 /*         ret = -1; */
  86
  87     tos = IPTOS_LOWDELAY;
  88     if (setsockopt(fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0)
  89         ret = -1;
  90
  91     return ret;
  92
  93 }
  94
  95 int pa_socket_set_rcvbuf(int fd, size_t l) {
  96     assert(fd >= 0);
  97
  98     if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &l, sizeof(l)) < 0)
  99         return -1;
 100
 101     return 0;
 102 }
 103
 104 int pa_socket_set_sndbuf(int fd, size_t l) {
 105     assert(fd >= 0);
 106
 107     if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &l, sizeof(l)) < 0)
 108         return -1;
 109
 110     return 0;
 111 }
 112
 113 int pa_unix_socket_is_stale(const char *fn) {
 114     struct sockaddr_un sa;
 115     int fd = -1, ret = -1;
 116
 117     if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
 118         fprintf(stderr, "socket(): %s\n", strerror(errno));
 119         goto finish;
 120     }
 121
 122     sa.sun_family = AF_LOCAL;
 123     strncpy(sa.sun_path, fn, sizeof(sa.sun_path)-1);
 124     sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
 125
 126     if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
 127         if (errno == ECONNREFUSED)
 128             ret = 1;
 129     } else
 130         ret = 0;
 131
 132 finish:
 133     if (fd >= 0)
 134         close(fd);
 135
 136     return ret;
 137 }
 138
 139 int pa_unix_socket_remove_stale(const char *fn) {
 140     int r;
 141
 142     if ((r = pa_unix_socket_is_stale(fn)) < 0)
 143         return errno != ENOENT ? -1 : 0;
 144
 145     if (!r)
 146         return 0;
 147
 148     /* Yes, here is a race condition. But who cares? */
 149     if (unlink(fn) < 0)
 150         return -1;
 151
 152     return 0;
 153 }
 154
 155 int pa_unix_socket_make_secure_dir(const char *fn) {
 156     int ret = -1;
 157     char *slash, *dir = strdup(fn);
 158     assert(dir);
 159
 160     if (!(slash = strrchr(dir, '/')))
 161         goto finish;
 162     *slash = 0;
 163
 164     if (pa_make_secure_dir(dir) < 0)
 165         goto finish;
 166
 167     ret = 0;
 168
 169 finish:
 170     free(dir);
 171     return ret;
 172 }
 173
 174 int pa_unix_socket_remove_secure_dir(const char *fn) {
 175     int ret = -1;
 176     char *slash, *dir = strdup(fn);
 177     assert(dir);
 178
 179     if (!(slash = strrchr(dir, '/')))
 180         goto finish;
 181     *slash = 0;
 182
 183     if (rmdir(dir) < 0)
 184         goto finish;
 185
 186     ret = 0;
 187
 188 finish:
 189     free(dir);
 190     return ret;
 191 }