1 | /* common.c - functions common to server.c and client.c
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2 |
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3 |
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4 |
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5 | 06/19
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6 | - fixed silly bug in create_and_watch_fifo_for_commands()
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7 |
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8 | 06/16
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9 | - added program_still_running()
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10 |
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11 | 06/14
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12 | - added create_and_watch_fifo_for_commands() from server.c
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13 | - if log_it(fatal,...) then call terminate_daemon()
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14 |
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15 | 06/11
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16 | - added register_pid(), set_signals()
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17 | - commented code a bit
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18 |
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19 | 06/10
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20 | - create function to call external executable in background
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21 | - create function to wait for it to terminate & to grab its result
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22 | - put them in common.c
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23 |
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24 |
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25 |
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26 | */
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27 |
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28 | #include "structs.h"
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29 |
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30 |
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31 | extern char g_command_fifo[MAX_STR_LEN+1];
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32 | extern char g_logfile[MAX_STR_LEN+1];
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33 | extern char *call_program_and_get_last_line_of_output(char*);
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34 | extern int call_program_and_log_output (char *);
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35 | extern bool does_file_exist (char *);
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36 | extern int make_hole_for_file (char *outfile_fname);
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37 | extern int process_incoming_command(char*);
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38 | extern void terminate_daemon(int);
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39 |
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40 |
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41 | void call_program_in_background(pthread_t*, char*);
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42 | void *call_prog_in_bkgd_SUB(void*);
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43 | int create_and_watch_fifo_for_commands(char*);
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44 | int get_bkgd_prog_result(pthread_t*);
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45 | void log_it_SUB(char*, t_loglevel, char*);
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46 | bool program_still_running(char*);
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47 | int receive_file_from_socket(FILE*fout, int socket_fd);
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48 | void register_pid(pid_t, char*);
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49 | void set_signals(bool);
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50 | char *tmsg_to_string(t_msg msg_type);
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51 | int read_block_from_fd(int, char*, int);
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52 | void termination_in_progress(int sig);
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53 | int transmit_file_to_socket(FILE*fin, int socket_fd);
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54 |
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55 |
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56 |
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57 | /*-----------------------------------------------------------*/
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58 |
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59 |
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60 |
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61 | void call_program_in_background(pthread_t *thread, char*command)
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62 | /*
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63 | Purpose:Execute external binary in a background thread created
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64 | specially for this purpose. Return. Leave binary running.
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65 | Params: thread - [returned] thread running in background
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66 | command - binary call to be executed
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67 | Return: 0 if prog started ok; nonzero if failure
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68 | NB: Use get_bkgd_prog_result() to wait for binary to terminate
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69 | and to get binary's result (zero or nonzero)
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70 | */
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71 | {
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72 | int res;
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73 |
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74 | res = pthread_create(thread, NULL, call_prog_in_bkgd_SUB, (void*)command);
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75 | if (res) { log_it(fatal, "Unable to call program in background - thread creation failure"); }
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76 | log_it(debug, "Done creating pthread. Will continue now.");
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77 | }
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78 |
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79 |
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80 |
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81 | /*-----------------------------------------------------------*/
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82 |
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83 |
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84 |
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85 | void *call_prog_in_bkgd_SUB(void*cmd)
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86 | {
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87 | /*
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88 | Purpose:Subroutine of call_program_in_background()
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89 | Params: cmd - binary call to be executed
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90 | Return: None
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91 | */
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92 | char*command;
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93 | int res;
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94 | char tmp[MAX_STR_LEN+1];
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95 | static char result_str[MAX_STR_LEN+1];
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96 |
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97 | command=(char*)cmd;
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98 | sprintf(tmp, "Calling '%s' in background pthread", command);
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99 | log_it(debug, tmp);
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100 | res = system(command);
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101 | sprintf(tmp, "'%s' is returning from bkgd process - res=%d", command, res);
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102 | log_it(debug, tmp);
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103 | sprintf(result_str, "%d", res);
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104 | pthread_exit((void*)result_str);
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105 | }
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106 |
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107 |
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108 |
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109 | /*-----------------------------------------------------------*/
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110 |
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111 |
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112 |
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113 | int create_and_watch_fifo_for_commands(char*devpath)
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114 | /*
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115 | Purpose:Create a FIFO (device). Open it. Read commands from it
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116 | if/when they're echoed to it (e.g. backup, restore, ...)
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117 | Params: devpath - path+filename of FIFO to create
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118 | Return: result (nonzero=failure; else, infinite loop & notional 0)
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119 | */
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120 | {
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121 | char tmp[MAX_STR_LEN+1], incoming[MAX_STR_LEN+1];
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122 | int res=0, fd, len, pos=0;
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123 |
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124 | res = make_hole_for_file(devpath) + mkfifo(devpath, 700);
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125 | if (res) { log_it(error, "Unable to prepare command FIFO"); return(res); }
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126 | strncpy(g_command_fifo, devpath, MAX_STR_LEN);
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127 | if (!(fd = open(g_command_fifo, O_RDONLY))) { log_it(error, "Unable to openin command FIFO"); return(1); }
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128 | // log_it(info, "Awaiting commands from FIFO");
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129 | for(;;)
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130 | {
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131 | len=read(fd, incoming+pos, 1);
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132 | if (len==0) { usleep(1000); continue; }
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133 | pos+=len;
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134 | incoming[pos]='\0';
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135 | if (incoming[pos-1]=='\n' || pos>=MAX_STR_LEN)
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136 | {
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137 | incoming[pos-1]='\0';
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138 | len=pos=0;
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139 | res=process_incoming_command(incoming);
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140 | if (res)
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141 | {
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142 | sprintf(tmp, "%s <-- errors occurred during processing", incoming);
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143 | log_it(error, tmp);
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144 | }
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145 | else
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146 | {
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147 | sprintf(tmp, "%s <-- command received OK", incoming);
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148 | log_it(info, tmp);
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149 | }
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150 | }
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151 | } // forever
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152 | return(0);
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153 | }
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154 |
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155 |
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156 | /*-----------------------------------------------------------*/
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157 |
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158 |
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159 |
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160 | int get_bkgd_prog_result(pthread_t *thread)
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161 | /*
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162 | Purpose:Wait for external binary (running in background) to terminate.
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163 | Discover how it ended (w/success or w/failure?).
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164 | Params: thread - thread running in background
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165 | Return: result (0=success, nonzero=failure)
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166 | NB: Binary was executed by call_program_in_background(). This
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167 | subroutine should be called sometime after that call.
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168 | */
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169 | {
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170 | void*vp;
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171 | void**pvp;
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172 | int res;
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173 | char tmp[MAX_STR_LEN+1], *p, result_str[MAX_STR_LEN+1];
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174 |
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175 | pvp=&vp;
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176 | vp=(void*)result_str;
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177 | strcpy(result_str, "(uninitialized)");
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178 | log_it(debug, "Waiting for bkgd prog to finish, so that we can get its result");
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179 | if (pthread_join(*thread, pvp)) { log_it(fatal, "pthread_join failed"); }
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180 | p = result_str;
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181 | p = (char*)vp;
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182 | res = atoi(p);
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183 | sprintf(tmp, "pthread res = %d ('%s')", res, p);
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184 | log_it(debug, tmp);
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185 | *thread = 0;
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186 | return(res);
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187 | }
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188 |
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189 |
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190 |
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191 | /*-----------------------------------------------------------*/
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192 |
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193 |
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194 |
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195 | void log_it_SUB(char *logfile, t_loglevel level, char *sz_message)
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196 | /*
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197 | Purpose:Log event and its level of severity.
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198 | Params: level - level of severity (debug/info/warn/error/fatal)
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199 | sz_message - message/event [string]
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200 | Return: None
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201 | */
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202 | {
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203 | char sz_outstr[MAX_STR_LEN], sz_level[MAX_STR_LEN], sz_time[MAX_STR_LEN];
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204 | time_t time_rec;
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205 | FILE*fout;
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206 |
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207 | time(&time_rec);
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208 | switch(level)
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209 | {
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210 | case debug: strcpy(sz_level, "DEBUG"); break;
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211 | case info: strcpy(sz_level, "INFO "); break;
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212 | case warn: strcpy(sz_level, "WARN "); break;
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213 | case error: strcpy(sz_level, "ERROR"); break;
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214 | case fatal: strcpy(sz_level, "FATAL"); break;
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215 | default: strcpy(sz_level, "UNKWN"); break;
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216 | }
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217 | sprintf(sz_time, ctime(&time_rec));
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218 | sz_time[strlen(sz_time)-6] = '\0';
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219 | sprintf(sz_outstr, "%s %s: %s", sz_time+11, sz_level, sz_message);
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220 | if ((int)level >= LOG_THESE_AND_HIGHER)
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221 | {
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222 | while (!(fout=fopen(logfile,"a"))) { usleep((int)(random()%32768)); }
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223 | fprintf(fout, "%s\n",sz_outstr);
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224 | fclose(fout);
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225 | }
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226 | if (level==fatal)
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227 | {
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228 | fprintf(stderr, "Aborting now. See %s for more information.\n", g_logfile);
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229 | terminate_daemon(0);
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230 | exit(1);
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231 | }
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232 | }
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233 |
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234 |
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235 |
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236 | /*-----------------------------------------------------------*/
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237 |
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238 |
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239 |
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240 | bool program_still_running(char*command)
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241 | {
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242 | char comm_sub[MAX_STR_LEN+1],
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243 | tmp[MAX_STR_LEN+1];
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244 | strncpy(comm_sub, command, 40);
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245 | comm_sub[40] = '\0';
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246 | sprintf(tmp, "ps ax | grep \"%s\" | grep -v \"ps ax\" | grep -v \"grep \"", comm_sub);
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247 | if (call_program_and_log_output(tmp))
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248 | { return(false); }
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249 | else
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250 | { return(true); }
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251 | }
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252 |
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253 |
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254 |
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255 | /*-----------------------------------------------------------*/
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256 |
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257 |
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258 |
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259 | int read_block_from_fd(int socket_fd, char*buf, int len_to_read)
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260 | /*
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261 | Purpose:Read N bytes from socket, into buffer
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262 | Params: socket_fd - socket to be read from
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263 | buf - buffer where incoming data will be stored
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264 | len_to_read - bytes to be read from socket
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265 | Return: bytes read
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266 | NB: if bytes read < len_to_read then there is
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267 | probably something wrong (e.g. EOF of pipe)
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268 | */
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269 | {
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270 | int length, noof_tries, i=0;
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271 | char tmp[MAX_STR_LEN+1];
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272 |
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273 | // log_it(debug, "Reading from pipe");
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274 | for(length=noof_tries=0; length<len_to_read && noof_tries<10; length+=i)
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275 | {
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276 | i = read(socket_fd, buf+length, len_to_read-length);
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277 | if (i==0) { noof_tries++; }
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278 | if (i<0) { log_it(error, "Error while reading from fd"); return(-1); }
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279 | }
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280 | if (length != len_to_read) { log_it(error, "Unable to continue reading from fd"); }
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281 | sprintf(tmp, "%d of %d bytes read from fd", length, len_to_read);
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282 | return(length);
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283 | }
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284 |
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285 |
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286 |
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287 | /*-----------------------------------------------------------*/
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288 |
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289 |
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290 |
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291 | int receive_file_from_socket(FILE*fout, int socket_fd)
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292 | /*
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293 | Purpose:Receive file from socket and save to disk / stream.
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294 | Params: socket_fd - file descriptor of socket
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295 | fout - file descriptor of output file
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296 | Return: result (0=success, nonzero=failure)
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297 | NB: socket_fd was created with open() but
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298 | fopen was created with fopen(). Different, see? Nyah.
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299 | */
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300 | {
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301 | int res=0, length, rotor=0, incoming_len;
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302 | char tmp[MAX_STR_LEN+1], buf[XFER_BUF_SIZE];
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303 | bool done;
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304 | long long total_length=0;
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305 |
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306 | signal(SIGPIPE, SIG_IGN);
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307 |
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308 | length=99999;
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309 | // sleep(1);
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310 | for(done=false; !done; )
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311 | {
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312 | // usleep(1000);
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313 | length = read_block_from_fd(socket_fd, buf, 3);
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314 | if (length<3) { log_it(debug, "Failed to read header block from fd"); res++; done=true; continue; }
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315 | rotor=(rotor%127)+1;
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316 | sprintf(tmp, "Rotor is %d (I was expecting %d)", buf[0], rotor);
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317 | if (buf[0]==0 && buf[1]==0x7B && buf[2]==0x21) { log_it(debug, "OK, end of stream. Cool."); done=true; continue; }
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318 | // log_it(debug, tmp);
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319 | if (buf[0]!=rotor) { log_it(debug, "Rotors do not match"); res++; break; }
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320 | incoming_len = buf[2];
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321 | if (incoming_len < 0) { incoming_len += 256; }
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322 | incoming_len += buf[1] * 256;
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323 | // memcpy((char*)&incoming_len, buf+1, 2);
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324 | sprintf(tmp, "Expecting %d bytes in block #%d", incoming_len, rotor);
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325 | // log_it(debug, tmp);
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326 | length = read_block_from_fd(socket_fd, buf, incoming_len);
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327 | /*
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328 | for(length=0,i=0; length<incoming_len; length+=i)
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329 | {
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330 | i = read(socket_fd, buf+length, incoming_len-length);
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331 | if (length<0) { log_it(debug, "Unable to read block in from socket_fd"); done=true; }
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332 | else if (length==0) { log_it(debug, "Zero-length block arrived from socket"); }
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333 | sprintf(tmp, "Read %d bytes from socket", i);
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334 | // log_it(debug, tmp);
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335 | }
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336 | */
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337 | if (length != incoming_len) { log_it(debug, "Error reading from socket"); res++; }
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338 | if (fwrite(buf, 1, length, fout)!=length) { log_it(debug, "Error writing data to output file"); res++; }
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339 | sprintf(tmp, "Written %d bytes to output stream", length);
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340 | total_length += length;
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341 | // log_it(debug, tmp);
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342 | }
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343 | if (total_length==0) { res++; log_it(debug, "Zero-length file received. Silly. I say that's an error."); }
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344 |
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345 | signal(SIGPIPE, terminate_daemon);
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346 |
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347 | return(res);
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348 | }
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349 |
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350 |
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351 |
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352 |
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353 | /*-----------------------------------------------------------*/
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354 |
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355 |
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356 |
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357 | void register_pid(pid_t pid, char*name_str)
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358 | /*
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359 | Purpose:Register executable's PID in /var/run/monitas-[name_str].pid;
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360 | store [pid] in data file
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361 | Params: pid - process ID to be stored in data file
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362 | name_str - name (e.g. "client" or "server") to be included
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363 | in the data file name of the PID locking file
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364 | Return: None
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365 | NB: Use pid=0 to delete the lock file and unregister the PID
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366 | */
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367 | {
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368 | char tmp[MAX_STR_LEN+1], lockfile_fname[MAX_STR_LEN+1];
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369 | int res;
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370 | FILE*fin;
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371 |
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372 | sprintf(lockfile_fname, "/var/run/monitas-%s.pid", name_str);
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373 | if (!pid)
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374 | {
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375 | log_it(debug, "Unregistering PID");
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376 | if (unlink(lockfile_fname)) { log_it(error, "Error unregistering PID"); }
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377 | return;
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378 | }
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379 | if (does_file_exist(lockfile_fname))
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380 | {
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381 | tmp[0]='\0';
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382 | if ((fin=fopen(lockfile_fname,"r"))) { fgets(tmp, MAX_STR_LEN, fin); fclose(fin); }
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383 | pid = atol(tmp);
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384 | sprintf(tmp, "ps %ld", (long int)pid);
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385 | res = call_program_and_log_output(tmp);
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386 | if (!res)
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387 | {
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388 | sprintf(tmp, "I believe the daemon is already running. If it isn't, please delete %s and try again.", lockfile_fname);
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389 | log_it(fatal, tmp);
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390 | }
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391 | }
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392 | sprintf(tmp, "echo %ld > %s", (long int)getpid(), lockfile_fname);
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393 | if (system(tmp)) { log_it(fatal, "Cannot register PID"); }
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394 | }
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395 |
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396 |
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397 |
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398 | /*-----------------------------------------------------------*/
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399 |
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400 |
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401 |
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402 | void set_signals(bool on)
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403 | /*
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404 | Purpose:Turn on/off signal-trapping
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405 | Params: on - turn on or off (true=on, false=off)
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406 | Return: None
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407 | */
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408 | {
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409 | int signals[]= { SIGKILL, SIGPIPE, SIGTERM, SIGHUP, SIGTRAP, SIGABRT, SIGINT, SIGSTOP, 0 };
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410 | int i;
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411 | for (i=0; signals[i]; i++)
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412 | {
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413 | if (on)
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414 | { signal(signals[i], terminate_daemon); }
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415 | else
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416 | { signal(signals[i], termination_in_progress); }
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417 | }
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418 | }
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419 |
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420 |
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421 |
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422 | /*-----------------------------------------------------------*/
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423 |
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424 |
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425 |
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426 | void termination_in_progress(int sig)
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427 | {
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428 | log_it(debug, "Termination in progress");
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429 | usleep(1000);
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430 | pthread_exit(0);
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431 | }
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432 |
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433 |
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434 |
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435 | /*-----------------------------------------------------------*/
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436 |
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437 |
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438 |
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439 | char *tmsg_to_string(t_msg msg_type)
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440 | /*
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441 | Purpose:turn msg_type struct variable into a string
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442 | Params: msg_type - type of message
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443 | Return: pointer to static string containing text version of msg_type
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444 | */
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445 | {
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446 | static char sz_msg[MAX_STR_LEN];
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447 | switch(msg_type)
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448 | {
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449 | case unused : strcpy(sz_msg, "unused"); break;
|
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450 | case login : strcpy(sz_msg, "login"); break;
|
---|
451 | case logout : strcpy(sz_msg, "logout"); break;
|
---|
452 | case login_ok:strcpy(sz_msg, "login_ok"); break;
|
---|
453 | case logout_ok:strcpy(sz_msg, "logout_ok"); break;
|
---|
454 | case ping : strcpy(sz_msg, "ping"); break;
|
---|
455 | case pong : strcpy(sz_msg, "pong"); break;
|
---|
456 | case login_fail : strcpy(sz_msg, "login_fail"); break;
|
---|
457 | case logout_fail: strcpy(sz_msg, "logout_fail"); break;
|
---|
458 | case trigger_backup: strcpy(sz_msg, "trigger_backup"); break;
|
---|
459 | case trigger_compare:strcpy(sz_msg, "trigger_compare"); break;
|
---|
460 | case trigger_restore:strcpy(sz_msg, "trigger_restore"); break;
|
---|
461 | case begin_stream: strcpy(sz_msg, "begin_stream"); break;
|
---|
462 | case end_stream: strcpy(sz_msg, "end_stream"); break;
|
---|
463 | case backup_ok: strcpy(sz_msg, "backup_ok"); break;
|
---|
464 | case backup_fail: strcpy(sz_msg, "backup_fail"); break;
|
---|
465 | case compare_ok: strcpy(sz_msg, "compare_ok"); break;
|
---|
466 | case compare_fail: strcpy(sz_msg, "compare_fail"); break;
|
---|
467 | case restore_ok: strcpy(sz_msg, "restore_ok"); break;
|
---|
468 | case restore_fail: strcpy(sz_msg, "restore_fail"); break;
|
---|
469 | case user_req: strcpy(sz_msg, "user_req"); break;
|
---|
470 | case progress_rpt: strcpy(sz_msg, "progress_rpt"); break;
|
---|
471 | default: strcpy(sz_msg, "(Fix tmsg_to_string please)"); break;
|
---|
472 | }
|
---|
473 | return(sz_msg);
|
---|
474 | }
|
---|
475 |
|
---|
476 |
|
---|
477 |
|
---|
478 | /*-----------------------------------------------------------*/
|
---|
479 |
|
---|
480 |
|
---|
481 |
|
---|
482 | int transmit_file_to_socket(FILE*fin, int socket_fd)
|
---|
483 | /*
|
---|
484 | Purpose:Transmit file to socket, from disk / stream.
|
---|
485 | Params: socket_fd - file descriptor of socket
|
---|
486 | fin - file descriptor of input file
|
---|
487 | Return: result (0=success, nonzero=failure)
|
---|
488 | NB: socket_fd was created with open() but
|
---|
489 | fopen was created with fopen(). Different, see? Nyah.
|
---|
490 | */
|
---|
491 | {
|
---|
492 | char tmp[MAX_STR_LEN+1], buf[XFER_BUF_SIZE];
|
---|
493 | int length, retval=0, rotor=0;
|
---|
494 | bool done;
|
---|
495 |
|
---|
496 | signal(SIGPIPE, SIG_IGN);
|
---|
497 | for(done=false; !done; )
|
---|
498 | {
|
---|
499 | if (feof(fin))
|
---|
500 | {
|
---|
501 | log_it(debug, "eof(fin) - OK, stopped reading from mondoarchive");
|
---|
502 | done=true;
|
---|
503 | continue;
|
---|
504 | }
|
---|
505 | // log_it(debug, "Reading from mondoarchive");
|
---|
506 | length = fread(buf, 1, XFER_BUF_SIZE, fin); /* read from fifo (i.e. mondoarchive) */
|
---|
507 | // sprintf(tmp, "%d bytes read from mondoarchive", length); log_it(debug, tmp);
|
---|
508 | if (length > 0)
|
---|
509 | {
|
---|
510 | tmp[0] = (char)(rotor=(rotor%127)+1);
|
---|
511 | tmp[1] = (char)(length / 256);
|
---|
512 | tmp[2] = (char)(length % 256);
|
---|
513 | if (write(socket_fd, tmp, 3)!=3) { log_it(debug, "Failed to write rotor and block_len to socket"); retval++; done=true; continue; }
|
---|
514 | // else { log_it(debug, "rotor and block_len written to socket"); }
|
---|
515 | if (write(socket_fd, buf, length)!=length) { log_it(debug, "Failed to write block read from mondoarchive to socket"); retval++; done=true; continue; }
|
---|
516 | else
|
---|
517 | {
|
---|
518 | sprintf(tmp, "Block #%d (%d bytes) written to socket", rotor, length);
|
---|
519 | // log_it(debug, tmp);
|
---|
520 | }
|
---|
521 | }
|
---|
522 | else if (length < 0)
|
---|
523 | { log_it(warn, "I had trouble reading from FIFO while calling mondoarchive"); }
|
---|
524 | }
|
---|
525 | if (retval==0)
|
---|
526 | {
|
---|
527 | // log_it(debug, "Writing final rotor (the 'end of stream' one) to socket");
|
---|
528 | tmp[0]=0;
|
---|
529 | tmp[1]=0x7B;
|
---|
530 | tmp[2]=0x21;
|
---|
531 | if (write(socket_fd, tmp, 3)!=3) { log_it(debug, "Failed to write end-of-stream rotor to socket"); retval++; }
|
---|
532 | }
|
---|
533 | log_it(debug, "Closed fopen() to tempdev");
|
---|
534 | // fclose(fin);
|
---|
535 | signal(SIGPIPE, terminate_daemon);
|
---|
536 | return(retval);
|
---|
537 | }
|
---|
538 |
|
---|
539 |
|
---|
540 |
|
---|
541 |
|
---|
542 |
|
---|
543 |
|
---|
544 |
|
---|
545 |
|
---|