[352] | 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;
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| 451 | case logout : strcpy(sz_msg, "logout"); break;
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| 452 | case login_ok:strcpy(sz_msg, "login_ok"); break;
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| 453 | case logout_ok:strcpy(sz_msg, "logout_ok"); break;
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| 454 | case ping : strcpy(sz_msg, "ping"); break;
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| 455 | case pong : strcpy(sz_msg, "pong"); break;
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| 456 | case login_fail : strcpy(sz_msg, "login_fail"); break;
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| 457 | case logout_fail: strcpy(sz_msg, "logout_fail"); break;
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| 458 | case trigger_backup: strcpy(sz_msg, "trigger_backup"); break;
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| 459 | case trigger_compare:strcpy(sz_msg, "trigger_compare"); break;
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| 460 | case trigger_restore:strcpy(sz_msg, "trigger_restore"); break;
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| 461 | case begin_stream: strcpy(sz_msg, "begin_stream"); break;
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| 462 | case end_stream: strcpy(sz_msg, "end_stream"); break;
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| 463 | case backup_ok: strcpy(sz_msg, "backup_ok"); break;
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| 464 | case backup_fail: strcpy(sz_msg, "backup_fail"); break;
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| 465 | case compare_ok: strcpy(sz_msg, "compare_ok"); break;
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| 466 | case compare_fail: strcpy(sz_msg, "compare_fail"); break;
|
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| 467 | case restore_ok: strcpy(sz_msg, "restore_ok"); break;
|
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| 468 | case restore_fail: strcpy(sz_msg, "restore_fail"); break;
|
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| 469 | case user_req: strcpy(sz_msg, "user_req"); break;
|
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| 470 | case progress_rpt: strcpy(sz_msg, "progress_rpt"); break;
|
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| 471 | default: strcpy(sz_msg, "(Fix tmsg_to_string please)"); break;
|
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| 472 | }
|
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| 473 | return(sz_msg);
|
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| 474 | }
|
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| 475 |
|
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| 476 |
|
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| 477 |
|
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| 478 | /*-----------------------------------------------------------*/
|
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| 479 |
|
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| 480 |
|
---|
| 481 |
|
---|
| 482 | int transmit_file_to_socket(FILE*fin, int socket_fd)
|
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| 483 | /*
|
---|
| 484 | Purpose:Transmit file to socket, from disk / stream.
|
---|
| 485 | Params: socket_fd - file descriptor of socket
|
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| 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 | */
|
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| 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 |
|
---|