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