Mercurial > ~mikael > mcabber > hg

annotate mcabber/src/fifo.c @ 1442:b49a1edba983

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Check file content when using /say_to -f A binary file could break the connection (Reported by Myhailo Danylenko).
author Mikael Berthe <mikael@lilotux.net>
date Fri, 29 Feb 2008 13:02:04 +0100
parents a8eb9aba2ed2
children eefa0ae248d8
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1 /*
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2 * fifo.c -- Read commands from a named pipe
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3 *
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4 * Copyright (C) 2008 Mikael Berthe <mikael@lilotux.net>
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5 *
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or (at
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9 * your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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19 * USA
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20 */
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21
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22 #include <stdio.h>
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23 #include <glib.h>
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24 #include <sys/types.h>
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25 #include <sys/stat.h>
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26 #include <fcntl.h>
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27 #include <unistd.h>
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28 #include <sys/time.h>
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29 #include <errno.h>
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30 #include <fcntl.h>
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31
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32 #include "commands.h"
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33 #include "logprint.h"
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34 #include "utils.h"
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35 #include "settings.h"
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36
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37 #include "hbuf.h" // For HBB_BLOCKSIZE
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38
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39 static FILE *sfd;
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40 static char *fifo_name;
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41
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42
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43 // fifo_init(fifo_path)
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44 // Create and open the FIFO file.
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45 // If fifo_path is NULL, reopen the current pipe.
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46 // Return 0 (success) or -1 (failure).
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47 int fifo_init(const char *fifo_path)
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48 {
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49 struct stat buf;
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50 int fd;
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51 char *fifo_path_xp;
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52
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53 if (!sfd && !fifo_path)
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54 return -1; // Nothing to do...
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55
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56 if (sfd && !fifo_path) { // We want to reinitialize the pipe
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57 fclose(sfd);
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58 sfd = NULL;
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59 if (fifo_name)
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60 goto fifo_init_open;
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61 }
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62 sfd = NULL;
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63
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64 fifo_path_xp = expand_filename(fifo_path);
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65
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66 if (!stat(fifo_path_xp, &buf)) {
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67 if (!S_ISFIFO(buf.st_mode)) {
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68 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO. "
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69 "%s already exists and is not a pipe", fifo_path_xp);
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70 g_free(fifo_path_xp);
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71 return -1;
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72 }
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73
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74 if (unlink(fifo_path_xp)) {
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75 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Unable to unlink FIFO %s [%s]",
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76 fifo_path_xp, g_strerror(errno));
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77 g_free(fifo_path_xp);
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78 return -1;
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79 }
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80 }
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81
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82 if (mkfifo(fifo_path_xp, S_IWUSR | S_IRUSR)) {
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83 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO [%s]",
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84 g_strerror(errno));
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85 g_free(fifo_path_xp);
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86 return -1;
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87 }
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88
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89 fifo_name = fifo_path_xp;
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90
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91 fifo_init_open:
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92 fd = open(fifo_name, O_RDONLY | O_NONBLOCK);
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93 if (!fd)
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94 return -1;
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95
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96 sfd = fdopen(fd, "r");
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97 if (fifo_path)
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98 scr_LogPrint(LPRINT_LOGNORM, "FIFO initialized (%s)", fifo_name);
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99 return 0;
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100 }
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101
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102 // fifo_deinit()
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103 // Close the current FIFO pipe and delete it.
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104 void fifo_deinit(void)
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105 {
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106 if (sfd) {
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107 fclose(sfd);
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108 sfd = NULL;
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109 }
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110 if (fifo_name) {
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111 unlink(fifo_name);
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112 g_free(fifo_name);
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113 fifo_name = NULL;
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114 }
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115 }
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116
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117 // fifo_read()
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118 // Read a line from the FIFO pipe (if available), and execute it.
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119 void fifo_read(void)
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120 {
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121 struct timeval tv;
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122 fd_set fds;
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123 char *getbuf;
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124 char buf[HBB_BLOCKSIZE+1];
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125 int fd;
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126
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127 if (!sfd) {
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128 return;
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129 }
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130
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131 tv.tv_sec = 0;
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132 tv.tv_usec = 0;
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133
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134 fd = fileno(sfd);
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135
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136 FD_ZERO(&fds);
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137 FD_SET(fd, &fds);
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138
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139 select(fd + 1, &fds, NULL, NULL, &tv);
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140
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141 if (!FD_ISSET(fd, &fds)) {
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142 return;
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143 }
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144
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145 getbuf = fgets(buf, HBB_BLOCKSIZE, sfd);
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146 if (getbuf) {
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147 guint logflag;
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148 char *eol = buf;
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149
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150 // Strip trailing newlines
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151 for ( ; *eol ; eol++)
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152 ;
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153 if (eol > buf)
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154 eol--;
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155 while (eol > buf && *eol == '\n')
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156 *eol-- = 0;
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157
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158 if (settings_opt_get_int("fifo_hide_commands"))
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159 logflag = LPRINT_LOG;
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160 else
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161 logflag = LPRINT_LOGNORM;
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162 scr_LogPrint(logflag, "Executing FIFO command: %s", buf);
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163 if (process_command(buf, TRUE) == 255)
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164 mcabber_set_terminate_ui();
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165 } else {
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166 if (feof(sfd))
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167 fifo_init(NULL); // Reopen the FIFO on EOF
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168 }
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169 }
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170
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171 // fifo_get_fd()
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172 // Return the FIFO file descriptor (-1 if none).
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173 int fifo_get_fd(void)
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174 {
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175 if (sfd)
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176 return fileno(sfd);
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177 return -1;
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178 }
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179
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180 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */