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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <errno.h>
  30 #include <assert.h>
  31 #include <string.h>
  32 #include <stdio.h>
  33 #include <sys/un.h>
  34 #include <netinet/in.h>
  35 #include <fcntl.h>
  36 #include <unistd.h>
  37 #include <sys/types.h>
  38 #include <netinet/tcp.h>
  39 #include <netinet/ip.h>
  40
  41 #include "socket-util.h"
  42 #include "util.h"
  43
  44 void pa_socket_peer_to_string(int fd, char *c, size_t l) {
  45     struct stat st;
  46
  47     assert(c && l && fd >= 0);
  48
  49     if (fstat(fd, &st) < 0) {
  50         snprintf(c, l, "Invalid client fd");
  51         return;
  52     }
  53
  54     if (S_ISSOCK(st.st_mode)) {
  55         union {
  56             struct sockaddr sa;
  57             struct sockaddr_in in;
  58             struct sockaddr_un un;
  59         } sa;
  60         socklen_t sa_len = sizeof(sa);
  61
  62         if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
  63
  64             if (sa.sa.sa_family == AF_INET) {
  65                 uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
  66
  67                 snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
  68                          ip >> 24,
  69                          (ip >> 16) & 0xFF,
  70                          (ip >> 8) & 0xFF,
  71                          ip & 0xFF,
  72                          ntohs(sa.in.sin_port));
  73                 return;
  74             } else if (sa.sa.sa_family == AF_LOCAL) {
  75                 snprintf(c, l, "UNIX socket client");
  76                 return;
  77             }
  78
  79         }
  80         snprintf(c, l, "Unknown network client");
  81         return;
  82     } else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
  83         snprintf(c, l, "STDIN/STDOUT client");
  84         return;
  85     }
  86
  87     snprintf(c, l, "Unknown client");
  88 }
  89
  90 int pa_socket_low_delay(int fd) {
  91     int priority;
  92     assert(fd >= 0);
  93
  94     priority = 7;
  95     if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < 0)
  96         return -1;
  97
  98     return 0;
  99 }
 100
 101 int pa_socket_tcp_low_delay(int fd) {
 102     int ret, tos;
 103
 104     assert(fd >= 0);
 105
 106     ret = pa_socket_low_delay(fd);
 107
 108 /*     on = 1; */
 109 /*     if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) */
 110 /*         ret = -1; */
 111
 112     tos = IPTOS_LOWDELAY;
 113     if (setsockopt(fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0)
 114         ret = -1;
 115
 116     return ret;
 117
 118 }
 119
 120 int pa_socket_set_rcvbuf(int fd, size_t l) {
 121     assert(fd >= 0);
 122
 123     if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &l, sizeof(l)) < 0)
 124         return -1;
 125
 126     return 0;
 127 }
 128
 129 int pa_socket_set_sndbuf(int fd, size_t l) {
 130     assert(fd >= 0);
 131
 132     if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &l, sizeof(l)) < 0)
 133         return -1;
 134
 135     return 0;
 136 }
 137
 138 int pa_unix_socket_is_stale(const char *fn) {
 139     struct sockaddr_un sa;
 140     int fd = -1, ret = -1;
 141
 142     if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
 143         fprintf(stderr, "socket(): %s\n", strerror(errno));
 144         goto finish;
 145     }
 146
 147     sa.sun_family = AF_LOCAL;
 148     strncpy(sa.sun_path, fn, sizeof(sa.sun_path)-1);
 149     sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
 150
 151     if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
 152         if (errno == ECONNREFUSED)
 153             ret = 1;
 154     } else
 155         ret = 0;
 156
 157 finish:
 158     if (fd >= 0)
 159         close(fd);
 160
 161     return ret;
 162 }
 163
 164 int pa_unix_socket_remove_stale(const char *fn) {
 165     int r;
 166
 167     if ((r = pa_unix_socket_is_stale(fn)) < 0)
 168         return errno != ENOENT ? -1 : 0;
 169
 170     if (!r)
 171         return 0;
 172
 173     /* Yes, here is a race condition. But who cares? */
 174     if (unlink(fn) < 0)
 175         return -1;
 176
 177     return 0;
 178 }
 179
 180 int pa_unix_socket_make_secure_dir(const char *fn) {
 181     int ret = -1;
 182     char *slash, *dir = strdup(fn);
 183     assert(dir);
 184
 185     if (!(slash = strrchr(dir, '/')))
 186         goto finish;
 187     *slash = 0;
 188
 189     if (pa_make_secure_dir(dir) < 0)
 190         goto finish;
 191
 192     ret = 0;
 193
 194 finish:
 195     free(dir);
 196     return ret;
 197 }
 198
 199 int pa_unix_socket_remove_secure_dir(const char *fn) {
 200     int ret = -1;
 201     char *slash, *dir = strdup(fn);
 202     assert(dir);
 203
 204     if (!(slash = strrchr(dir, '/')))
 205         goto finish;
 206     *slash = 0;
 207
 208     if (rmdir(dir) < 0)
 209         goto finish;
 210
 211     ret = 0;
 212
 213 finish:
 214     free(dir);
 215     return ret;
 216 }