code.delx.au - pulseaudio/blob - polyp/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 Lesser 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 Lesser 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/types.h>
  34 #include <sys/un.h>
  35 #include <netinet/in.h>
  36 #include <fcntl.h>
  37 #include <unistd.h>
  38 #include <netinet/in_systm.h>
  39 #include <netinet/tcp.h>
  40 #include <netinet/ip.h>
  41 #include <sys/socket.h>
  42 #include <sys/stat.h>
  43 #include <netdb.h>
  44
  45 #include "socket-util.h"
  46 #include "util.h"
  47 #include "xmalloc.h"
  48 #include "log.h"
  49
  50 void pa_socket_peer_to_string(int fd, char *c, size_t l) {
  51     struct stat st;
  52
  53     assert(c && l && fd >= 0);
  54
  55     if (fstat(fd, &st) < 0) {
  56         snprintf(c, l, "Invalid client fd");
  57         return;
  58     }
  59
  60     if (S_ISSOCK(st.st_mode)) {
  61         union {
  62             struct sockaddr sa;
  63             struct sockaddr_in in;
  64             struct sockaddr_un un;
  65         } sa;
  66         socklen_t sa_len = sizeof(sa);
  67
  68         if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
  69
  70             if (sa.sa.sa_family == AF_INET) {
  71                 uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
  72
  73                 snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
  74                          ip >> 24,
  75                          (ip >> 16) & 0xFF,
  76                          (ip >> 8) & 0xFF,
  77                          ip & 0xFF,
  78                          ntohs(sa.in.sin_port));
  79                 return;
  80             } else if (sa.sa.sa_family == AF_LOCAL) {
  81                 snprintf(c, l, "UNIX socket client");
  82                 return;
  83             }
  84
  85         }
  86         snprintf(c, l, "Unknown network client");
  87         return;
  88     } else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
  89         snprintf(c, l, "STDIN/STDOUT client");
  90         return;
  91     }
  92
  93     snprintf(c, l, "Unknown client");
  94 }
  95
  96 int pa_socket_low_delay(int fd) {
  97     int priority;
  98     assert(fd >= 0);
  99
 100 #ifdef SO_PRIORITY
 101     priority = 7;
 102     if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < 0)
 103         return -1;
 104 #endif
 105
 106     return 0;
 107 }
 108
 109 int pa_socket_tcp_low_delay(int fd) {
 110     int ret, tos, on;
 111
 112     assert(fd >= 0);
 113
 114     ret = pa_socket_low_delay(fd);
 115
 116     on = 1;
 117
 118 #if defined(SOL_TCP) || defined(IPPROTO_TCP)
 119 #if defined(SOL_TCP)
 120     if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 121 #else
 122     if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 123 #endif
 124         ret = -1;
 125 #endif
 126
 127 #if defined(IPTOS_LOWDELAY) && defined(IP_TOS) && (defined(SOL_IP) || \
 128         defined(IPPROTO_IP))
 129     tos = IPTOS_LOWDELAY;
 130 #ifdef SOL_IP
 131     if (setsockopt(fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0)
 132 #else
 133     if (setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
 134 #endif
 135         ret = -1;
 136 #endif
 137
 138     return ret;
 139
 140 }
 141
 142 int pa_socket_set_rcvbuf(int fd, size_t l) {
 143     assert(fd >= 0);
 144
 145 /*     if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &l, sizeof(l)) < 0) { */
 146 /*         pa_log(__FILE__": SO_RCVBUF: %s\n", strerror(errno)); */
 147 /*         return -1; */
 148 /*     } */
 149
 150     return 0;
 151 }
 152
 153 int pa_socket_set_sndbuf(int fd, size_t l) {
 154     assert(fd >= 0);
 155
 156 /*     if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &l, sizeof(l)) < 0) { */
 157 /*         pa_log(__FILE__": SO_SNDBUF: %s\n", strerror(errno)); */
 158 /*         return -1; */
 159 /*     } */
 160
 161     return 0;
 162 }
 163
 164 int pa_unix_socket_is_stale(const char *fn) {
 165     struct sockaddr_un sa;
 166     int fd = -1, ret = -1;
 167
 168     if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
 169         pa_log(__FILE__": socket(): %s\n", strerror(errno));
 170         goto finish;
 171     }
 172
 173     sa.sun_family = AF_LOCAL;
 174     strncpy(sa.sun_path, fn, sizeof(sa.sun_path)-1);
 175     sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
 176
 177     if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
 178         if (errno == ECONNREFUSED)
 179             ret = 1;
 180     } else
 181         ret = 0;
 182
 183 finish:
 184     if (fd >= 0)
 185         close(fd);
 186
 187     return ret;
 188 }
 189
 190 int pa_unix_socket_remove_stale(const char *fn) {
 191     int r;
 192
 193     if ((r = pa_unix_socket_is_stale(fn)) < 0)
 194         return errno != ENOENT ? -1 : 0;
 195
 196     if (!r)
 197         return 0;
 198
 199     /* Yes, here is a race condition. But who cares? */
 200     if (unlink(fn) < 0)
 201         return -1;
 202
 203     return 0;
 204 }
 205
 206 struct sockaddr *pa_resolve_server(const char *server, size_t *len, uint16_t nport) {
 207     struct sockaddr *sa;
 208     struct addrinfo hints, *result = NULL;
 209     char *port, host[256], tmp[16];
 210     assert(server && len);
 211
 212     snprintf(host, sizeof(host), "%s", server);
 213     host[strcspn(host, ":")] = 0;
 214
 215     if ((port = strrchr(server, ':')))
 216         port++;
 217
 218     if (!port)
 219         snprintf(port = tmp, sizeof(tmp), "%u", nport);
 220
 221     memset(&hints, 0, sizeof(hints));
 222     hints.ai_family = PF_UNSPEC;
 223     hints.ai_socktype = SOCK_STREAM;
 224     hints.ai_protocol = 0;
 225
 226     if (getaddrinfo(host, port, &hints, &result) != 0)
 227         return NULL;
 228     assert(result);
 229
 230     sa = pa_xmalloc(*len = result->ai_addrlen);
 231     memcpy(sa, result->ai_addr, *len);
 232
 233     freeaddrinfo(result);
 234
 235     return sa;
 236 }
 237