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annotate mcabber/mcabber/fifo_internal.c @ 2135:361603828d9e

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Set the trace log file permissions again when we write to it If the log file is recreated (e.g. log rotation) the new file will have correct permissions.
author Mikael Berthe <mikael@lilotux.net>
date Sun, 06 Jul 2014 10:20:30 +0200
parents 8da280d34b48
children 038c4d601011
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1 /*
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2 * fifo_internal.c -- Read commands from a named pipe
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3 *
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4 * Copyright (C) 2008,2009 Mikael Berthe <mikael@lilotux.net>
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33483d3324cf s/Copyrigth/Copyright/ and so on
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5 * Copyright (C) 2009 Myhailo Danylenko <isbear@ukrpost.net>
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6 *
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7 * This program is free software; you can redistribute it and/or modify
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8 * it under the terms of the GNU General Public License as published by
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9 * the Free Software Foundation; either version 2 of the License, or (at
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10 * your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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20 * USA
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21 */
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22
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23 #include <stdlib.h>
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24 #include <glib.h>
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25 #include <sys/types.h>
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26 #include <sys/stat.h>
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27 #include <fcntl.h>
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28 #include <unistd.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 #include "main.h"
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37
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38 static char *fifo_name = NULL;
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39 static GIOChannel *fifo_channel = NULL;
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40
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41 static const char *FIFO_ENV_NAME = "MCABBER_FIFO";
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42
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43 static gboolean attach_fifo(const char *name);
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44
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45 static guint fifo_callback(GIOChannel *channel,
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46 GIOCondition condition,
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47 gpointer data)
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48 {
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49 if (condition & (G_IO_IN|G_IO_PRI)) {
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50 GIOStatus chstat;
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51 gchar *buf;
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52 gsize endpos;
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53
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54 chstat = g_io_channel_read_line(channel, &buf, NULL, &endpos, NULL);
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55 if (chstat == G_IO_STATUS_ERROR || chstat == G_IO_STATUS_EOF) {
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56 if (!attach_fifo(fifo_name))
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57 scr_LogPrint(LPRINT_LOGNORM,
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58 "Reopening fifo failed! Fifo will not work from now!");
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59 return FALSE;
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60 }
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61 if (buf) {
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62 guint logflag;
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63 guint fifo_ignore = settings_opt_get_int("fifo_ignore");
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64
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65 if (endpos)
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66 buf[endpos] = '\0';
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67
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68 if (settings_opt_get_int("fifo_hide_commands"))
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69 logflag = LPRINT_LOG;
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70 else
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71 logflag = LPRINT_LOGNORM;
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72 scr_LogPrint(logflag, "%s FIFO command: %s",
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73 (fifo_ignore ? "Ignoring" : "Executing"), buf);
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74 if (!fifo_ignore) {
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75 if (process_command(buf, TRUE) == 255)
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76 mcabber_set_terminate_ui();
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77 }
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78
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79 g_free(buf);
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80 }
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81 } else if (condition & (G_IO_ERR|G_IO_NVAL|G_IO_HUP)) {
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82 if (!attach_fifo(fifo_name))
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83 scr_LogPrint(LPRINT_LOGNORM,
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84 "Reopening fifo failed! Fifo will not work from now!");
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85 return FALSE;
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86 }
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87 return TRUE;
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88 }
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89
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90 static void fifo_destroy_callback(gpointer data)
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91 {
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92 GIOChannel *channel = (GIOChannel *)data;
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93 g_io_channel_unref(channel);
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94 channel = NULL;
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95 }
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96
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97 static gboolean check_fifo(const char *name)
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98 {
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99 struct stat finfo;
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100 if (stat(name, &finfo) == -1) {
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101 /* some unknown error */
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102 if (errno != ENOENT)
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103 return FALSE;
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104 /* fifo not yet exists */
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105 if (mkfifo(name, S_IRUSR|S_IWUSR) != -1)
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106 return check_fifo(name);
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107 else
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108 return FALSE;
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109 }
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110
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111 /* file exists */
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112 if (S_ISFIFO(finfo.st_mode))
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113 return TRUE;
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114 else
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115 return FALSE;
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116 }
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117
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118 static gboolean attach_fifo(const char *name)
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119 {
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120 GSource *source;
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121 int fd = open (name, O_RDONLY|O_NONBLOCK);
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122 if (fd == -1)
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123 return FALSE;
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124
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125 if (fifo_channel)
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126 g_io_channel_unref(fifo_channel);
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127
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128 fifo_channel = g_io_channel_unix_new(fd);
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129
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130 g_io_channel_set_flags(fifo_channel, G_IO_FLAG_NONBLOCK, NULL);
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131 g_io_channel_set_encoding(fifo_channel, NULL, NULL);
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132 g_io_channel_set_close_on_unref(fifo_channel, TRUE);
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133
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134 source = g_io_create_watch(fifo_channel,
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135 G_IO_IN|G_IO_PRI|G_IO_ERR|G_IO_HUP|G_IO_NVAL);
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136 g_source_set_callback(source, (GSourceFunc)fifo_callback,
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137 (gpointer)fifo_channel,
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138 (GDestroyNotify)fifo_destroy_callback);
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139 g_source_attach(source, main_context);
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140
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141 return TRUE;
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142 }
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143
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144 void fifo_deinit(void)
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145 {
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146 unsetenv(FIFO_ENV_NAME);
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147
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148 if (fifo_channel)
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149 g_source_remove_by_user_data(fifo_channel);
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150 /* channel itself should be destroyed by destruction callback */
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151 /* destroy open fifo */
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152 if (fifo_name) {
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153 /* well, that may create fifo, and then unlink,
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154 * but at least we will not destroy non-fifo data */
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155 if (check_fifo(fifo_name))
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156 unlink(fifo_name);
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157 g_free(fifo_name);
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158 fifo_name = NULL;
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159 }
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160 }
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161
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162 // fifo_init_internal(path)
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163 // If path is NULL, reopen existing fifo, else open anew.
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164 static int fifo_init_internal(const char *fifo_path)
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165 {
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166 if (fifo_path) {
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167 fifo_deinit();
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168 fifo_name = expand_filename(fifo_path);
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169
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170 if (!check_fifo(fifo_name)) {
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171 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO. "
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172 "%s already exists and is not a pipe", fifo_name);
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173 g_free(fifo_name);
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174 fifo_name = NULL;
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175 return -1;
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176 }
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177 } else if (fifo_name)
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178 g_source_remove_by_user_data(fifo_channel);
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179 else
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180 return -1;
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181
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182 if (!attach_fifo(fifo_name)) {
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183 scr_LogPrint(LPRINT_LOGNORM, "Error: Cannot open fifo");
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184 return -1;
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185 }
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186
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187 setenv(FIFO_ENV_NAME, fifo_name, 1);
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188
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189 scr_LogPrint(LPRINT_LOGNORM, "FIFO initialized (%s)", fifo_path);
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190 return 1;
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191 }
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192
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193 static gchar *fifo_guard(const gchar *key, const gchar *new_value)
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194 {
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195 if (new_value)
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196 fifo_init_internal(new_value);
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197 else
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198 fifo_deinit();
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199 return g_strdup(new_value);
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200 }
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201
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202 // Returns 1 in case of success, -1 on error
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203 int fifo_init(void)
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204 {
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205 const char *path = settings_opt_get("fifo_name");
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206 static gboolean guard_installed = FALSE;
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207 if (!guard_installed)
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208 if (!(guard_installed = settings_set_guard("fifo_name", fifo_guard)))
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209 scr_LogPrint(LPRINT_DEBUG, "fifo: BUG: Cannot install option guard!");
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diff changeset
210 if (path)
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211 return fifo_init_internal(path);
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212 return 1;
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213 }
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parents:
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214
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215 /* vim: set expandtab cindent cinoptions=>2\:2(0 sw=2 ts=2: For Vim users... */