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 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 #include <netdb.h>
  41
  42 #include "socket-util.h"
  43 #include "util.h"
  44 #include "xmalloc.h"
  45 #include "log.h"
  46
  47 void pa_socket_peer_to_string(int fd, char *c, size_t l) {
  48     struct stat st;
  49
  50     assert(c && l && fd >= 0);
  51
  52     if (fstat(fd, &st) < 0) {
  53         snprintf(c, l, "Invalid client fd");
  54         return;
  55     }
  56
  57     if (S_ISSOCK(st.st_mode)) {
  58         union {
  59             struct sockaddr sa;
  60             struct sockaddr_in in;
  61             struct sockaddr_un un;
  62         } sa;
  63         socklen_t sa_len = sizeof(sa);
  64
  65         if (getpeername(fd, &sa.sa, &sa_len) >= 0) {
  66
  67             if (sa.sa.sa_family == AF_INET) {
  68                 uint32_t ip = ntohl(sa.in.sin_addr.s_addr);
  69
  70                 snprintf(c, l, "TCP/IP client from %i.%i.%i.%i:%u",
  71                          ip >> 24,
  72                          (ip >> 16) & 0xFF,
  73                          (ip >> 8) & 0xFF,
  74                          ip & 0xFF,
  75                          ntohs(sa.in.sin_port));
  76                 return;
  77             } else if (sa.sa.sa_family == AF_LOCAL) {
  78                 snprintf(c, l, "UNIX socket client");
  79                 return;
  80             }
  81
  82         }
  83         snprintf(c, l, "Unknown network client");
  84         return;
  85     } else if (S_ISCHR(st.st_mode) && (fd == 0 || fd == 1)) {
  86         snprintf(c, l, "STDIN/STDOUT client");
  87         return;
  88     }
  89
  90     snprintf(c, l, "Unknown client");
  91 }
  92
  93 int pa_socket_low_delay(int fd) {
  94     int priority;
  95     assert(fd >= 0);
  96
  97     priority = 7;
  98     if (setsockopt(fd, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < 0)
  99         return -1;
 100
 101     return 0;
 102 }
 103
 104 int pa_socket_tcp_low_delay(int fd) {
 105     int ret, tos, on;
 106
 107     assert(fd >= 0);
 108
 109     ret = pa_socket_low_delay(fd);
 110
 111     on = 1;
 112     if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 113         ret = -1;
 114
 115     tos = IPTOS_LOWDELAY;
 116     if (setsockopt(fd, SOL_IP, IP_TOS, &tos, sizeof(tos)) < 0)
 117         ret = -1;
 118
 119     return ret;
 120
 121 }
 122
 123 int pa_socket_set_rcvbuf(int fd, size_t l) {
 124     assert(fd >= 0);
 125
 126 /*     if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &l, sizeof(l)) < 0) { */
 127 /*         pa_log(__FILE__": SO_RCVBUF: %s\n", strerror(errno)); */
 128 /*         return -1; */
 129 /*     } */
 130
 131     return 0;
 132 }
 133
 134 int pa_socket_set_sndbuf(int fd, size_t l) {
 135     assert(fd >= 0);
 136
 137 /*     if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &l, sizeof(l)) < 0) { */
 138 /*         pa_log(__FILE__": SO_SNDBUF: %s\n", strerror(errno)); */
 139 /*         return -1; */
 140 /*     } */
 141
 142     return 0;
 143 }
 144
 145 int pa_unix_socket_is_stale(const char *fn) {
 146     struct sockaddr_un sa;
 147     int fd = -1, ret = -1;
 148
 149     if ((fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
 150         pa_log(__FILE__": socket(): %s\n", strerror(errno));
 151         goto finish;
 152     }
 153
 154     sa.sun_family = AF_LOCAL;
 155     strncpy(sa.sun_path, fn, sizeof(sa.sun_path)-1);
 156     sa.sun_path[sizeof(sa.sun_path) - 1] = 0;
 157
 158     if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) {
 159         if (errno == ECONNREFUSED)
 160             ret = 1;
 161     } else
 162         ret = 0;
 163
 164 finish:
 165     if (fd >= 0)
 166         close(fd);
 167
 168     return ret;
 169 }
 170
 171 int pa_unix_socket_remove_stale(const char *fn) {
 172     int r;
 173
 174     if ((r = pa_unix_socket_is_stale(fn)) < 0)
 175         return errno != ENOENT ? -1 : 0;
 176
 177     if (!r)
 178         return 0;
 179
 180     /* Yes, here is a race condition. But who cares? */
 181     if (unlink(fn) < 0)
 182         return -1;
 183
 184     return 0;
 185 }
 186
 187 int pa_unix_socket_make_secure_dir(const char *fn) {
 188     int ret = -1;
 189     char *slash, *dir = pa_xstrdup(fn);
 190
 191     if (!(slash = strrchr(dir, '/')))
 192         goto finish;
 193     *slash = 0;
 194
 195     if (pa_make_secure_dir(dir) < 0)
 196         goto finish;
 197
 198     ret = 0;
 199
 200 finish:
 201     pa_xfree(dir);
 202     return ret;
 203 }
 204
 205 int pa_unix_socket_remove_secure_dir(const char *fn) {
 206     int ret = -1;
 207     char *slash, *dir = pa_xstrdup(fn);
 208
 209     if (!(slash = strrchr(dir, '/')))
 210         goto finish;
 211     *slash = 0;
 212
 213     if (rmdir(dir) < 0)
 214         goto finish;
 215
 216     ret = 0;
 217
 218 finish:
 219     pa_xfree(dir);
 220     return ret;
 221 }
 222
 223 struct sockaddr *pa_resolve_server(const char *server, size_t *len, uint16_t nport) {
 224     struct sockaddr *sa;
 225     struct addrinfo hints, *result = NULL;
 226     char *port, host[256], tmp[16];
 227     assert(server && len);
 228
 229     snprintf(host, sizeof(host), "%s", server);
 230     host[strcspn(host, ":")] = 0;
 231
 232     if ((port = strrchr(server, ':')))
 233         port++;
 234
 235     if (!port)
 236         snprintf(port = tmp, sizeof(tmp), "%u", nport);
 237
 238     memset(&hints, 0, sizeof(hints));
 239     hints.ai_family = PF_UNSPEC;
 240     hints.ai_socktype = SOCK_STREAM;
 241     hints.ai_protocol = 0;
 242
 243     if (getaddrinfo(host, port, &hints, &result) != 0)
 244         return NULL;
 245     assert(result);
 246
 247     sa = pa_xmalloc(*len = result->ai_addrlen);
 248     memcpy(sa, result->ai_addr, *len);
 249
 250     freeaddrinfo(result);
 251
 252     return sa;
 253 }
 254