static struct buffer parse_table(struct buffer buff,
struct invocation *invocation, const char **error)
{
unsigned i;
size_t ident_len;
struct argument args[QUERY_MAX_ARGS];
const char *ident_name = NULL;
unsigned argi = 0;
buff = chomp(buff);
buff = expect_char(buff, '{', error);
if (*error)
goto clean;
buff = chomp(buff);
while (!peek(buff, "}"))
{
if (argi >= QUERY_MAX_ARGS)
{
raise_too_many_arguments(error);
goto clean;
}
if (isalpha((int)buff.data[buff.offset]))
{
buff = get_ident(buff, &ident_name, &ident_len, error);
if (!*error)
{
args[argi].a.value.type = RDT_STRING;
args[argi].a.value.val.string.len = ident_len;
args[argi].a.value.val.string.buff = (char*)calloc(
ident_len + 1,
sizeof(char)
);
if (!args[argi].a.value.val.string.buff)
goto clean;
strncpy(
args[argi].a.value.val.string.buff,
ident_name,
ident_len
);
}
}
else
buff = parse_string(buff, &args[argi].a.value, error);
if (*error)
goto clean;
args[argi].type = AT_VALUE;
buff = chomp(buff);
argi++;
buff = expect_char(buff, ':', error);
if (*error)
goto clean;
buff = chomp(buff);
if (argi >= QUERY_MAX_ARGS)
{
raise_too_many_arguments(error);
goto clean;
}
buff = parse_argument(buff, &args[argi], error);
if (*error)
goto clean;
argi++;
buff = chomp(buff);
buff = expect_char(buff, ',', error);
if (*error)
{
*error = NULL;
break;
}
buff = chomp(buff);
}
buff = expect_char(buff, '}', error);
if (*error)
goto clean;
invocation->func = all_map;
invocation->argc = argi;
invocation->argv = (struct argument*)
malloc(sizeof(struct argument) * argi);
if (!invocation->argv)
{
raise_enomem(error);
goto clean;
}
memcpy(invocation->argv, args,
sizeof(struct argument) * argi);
goto success;
clean:
for (i = 0; i < argi; i++)
argument_free(&args[i]);
success:
return buff;
}
int main(int argc, char** argv)
{
int ifd, len = 0, i = 0, selectret = 0, maxfd, retryselect, pid;
char buf[BUF_LEN];
char *configdir;
char *pidfilename;
char *statusfilename;
char *statusbin;
char *error_str;
char *version_str = PACKAGE_STRING;
char *pbuf;
char *filename;
FILE *pidfile;
FILE *statusfile;
fd_set set;
struct inotify_event *event;
struct argument *argument = argument_new();
struct pipe_list *pipe_list_cur;
struct stat file_stat;
struct watchnode *node;
/* alloc pipe list */
pipe_list_head = malloc(sizeof(struct pipe_list));
pipe_list_head->next = NULL;
/* set up signals for exiting/reaping */
signal(SIGINT, &handle_quit_signal);
signal(SIGTERM, &handle_quit_signal);
signal(SIGCHLD, &handle_child_signal);
signal(SIGHUP, &handle_hup_signal);
/* add command line arguments */
argument_register(argument, "help", "Prints this help text.", 0);
argument_register(argument, "version", "Prints version information.", 0);
argument_register(argument, "daemon", "Run as a daemon.", 0);
argument_register(argument, "verbose", "Turns on debug text.", 0);
argument_register(argument, "sync", "Sync mode (for debugging).", 0);
argument_register(argument, "log-to-stdout", "Deprecated, use \"--log-to=stdout\" instead", 0);
argument_register(argument, "log-to", "Log messages with specified way. "
#ifdef USE_SYSLOG
"Can be: stdout, file, syslog. \"file\" by default.", 1);
#else
"Can be: stdout, file. \"file\" by default.", 1);
#endif
if ((error_str = argument_parse(argument, argc, argv))) {
fprintf(stderr, "Error in arguments: %s", error_str);
free(error_str);
return -1;
}
if (argument_exists(argument, "help")) {
char *help_txt = argument_get_help_text(argument);
printf("%s", help_txt);
free(help_txt);
return 0;
}
if (argument_exists(argument, "version")) {
printf("%s\n", version_str);
return 0;
}
if (argument_exists(argument, "verbose")) {
verbose = 1;
}
if (argument_exists(argument, "daemon") && fork())
return 0;
if (argument_exists(argument, "sync"))
syncmode = 1;
if (argument_exists(argument, "log-to-stdout"))
fprintf(stderr, "Warning, this option is deprecated, " \
"please use new syntax: \"--log-to=stdout\".\n");
logtype = LOG_FILE;
if (argument_exists(argument, "log-to") && \
(log_arg = argument_get_value(argument, "log-to")) != NULL)
{
if (strcmp(log_arg, "stdout") == 0)
logtype = LOG_STDOUT;
#ifdef USE_SYSLOG
else if (strcmp(log_arg, "syslog") == 0)
logtype = LOG_SYS;
#endif
else /* logtype already set to 'file' above */
fprintf(stderr, "Warning, selected unknown logging type. " \
"Will use \"--log-to=file\" instead.\n");
}
/* get config dir (must free this) */
configdir = get_config_dir();
/* if a config file has not been specified, use default */
if (argument_get_extra(argument))
{
configfile = strdup(argument_get_extra(argument));
}
else
{
configfile = malloc (strlen(configdir) + strlen ("/config") + 1);
sprintf(configfile, "%s/config", configdir);
}
argument_free(argument);
free(configdir);
if (access(configfile, R_OK) != 0)
{
fprintf(stderr, "error: could not open config file: %s\n", configfile);
return -1;
}
/* create a pid file */
pidfilename = get_pid_filename();
if (stat(pidfilename, &file_stat) == 0) /* pidfile exists */
{
pidfile = fopen(pidfilename, "r");
if (fscanf(pidfile, "%d", &pid) == 1) /* pidfile has a pid inside */
{
char *binaryname;
char *scanformat;
if ((binaryname = strrchr(argv[0], '/')) != NULL)
{
binaryname++;
}
else
{
binaryname = argv[0];
}
scanformat = malloc(strlen("Name: %") + strlen(binaryname) + strlen("s") + 1);
statusfilename = malloc(strlen("/proc/") + 6 + strlen("/status") + 1);
sprintf(statusfilename, "/proc/%d/status", pid);
if (stat(statusfilename, &file_stat) != 0) /* write pid file if the process no longer exists */
{
write_pid_file(pidfilename);
}
else /* process exists, so check owner and binary name */
{
statusfile = fopen(statusfilename, "r");
statusbin = malloc(strlen(binaryname) + 2); /* the binary name may start with "fsniper" but be longer */
sprintf(scanformat, "Name: %%%ds", strlen(binaryname) + 1);
fscanf(statusfile, scanformat, statusbin);
free(statusfilename);
fclose(statusfile);
fclose(pidfile);
if (strcmp(binaryname, statusbin) == 0 && file_stat.st_uid == getuid())
/* exit if the process is fsniper and is owned by the current user */
{
printf("%s: already running instance found with pid %d. exiting.\n", binaryname, pid);
exit(1);
}
else /* the pid file contains an old pid, one that isn't fsniper, or one not owned by the current user */
{
write_pid_file(pidfilename);
}
}
}
else /* pidfile is invalid */
{
fclose(pidfile);
write_pid_file(pidfilename);
}
}
else /* the pidfile doesn't exist */
{
write_pid_file(pidfilename);
}
free(pidfilename);
/* start up log */
if (!log_open())
{
fprintf(stderr, "Error: could not start log.\n");
return -1;
}
ifd = inotify_init();
if (ifd < 0)
{
perror("inotify_init");
return -1;
}
if (verbose) log_write("Parsing config file: %s\n", configfile);
config = keyval_parse_file(configfile);
if ((error_str = keyval_get_error())) {
fprintf(stderr, "%s", error_str);
free(error_str);
exit(1);
}
validate_config(config);
/* add nodes to the inotify descriptor */
g_watchnode = add_watches(ifd);
/* wait for events and then handle them */
while (1)
{
/* set up fds and max */
FD_ZERO(&set);
FD_SET(ifd, &set);
maxfd = ifd;
for (pipe_list_cur = pipe_list_head->next; pipe_list_cur; pipe_list_cur = pipe_list_cur->next)
{
FD_SET(pipe_list_cur->pfd[0], &set);
if (pipe_list_cur->pfd[0] > maxfd)
maxfd = pipe_list_cur->pfd[0];
}
retryselect = 1;
while (retryselect)
{
/* use select to get activity on any of the fds */
selectret = select(maxfd + 1, &set, NULL, NULL, NULL);
if (selectret == -1)
{
if (errno == EINTR)
retryselect = 1;
else
handle_quit_signal(-2);
} else
retryselect = 0;
}
/* handle any events on the inotify fd */
if (FD_ISSET(ifd, &set))
{
len = read(ifd, buf, BUF_LEN);
while (i < len)
{
event = (struct inotify_event *) &buf[i];
if (event->len && (event->mask & IN_CLOSE_WRITE || event->mask & IN_MOVED_TO))
{
/* if sync mode, just call handle_exec */
if (syncmode == 1)
{
handle_event(event, fileno(_logfd));
}
else
{
/* create new pipe_list entry */
for (pipe_list_cur = pipe_list_head; pipe_list_cur->next != NULL; pipe_list_cur = pipe_list_cur->next) {}
pipe_list_cur->next = malloc(sizeof(struct pipe_list));
pipe_list_cur->next->next = NULL;
/* create pipe */
pipe(pipe_list_cur->next->pfd);
if (fork() == 0)
{
/* child, close 0 */
close(pipe_list_cur->next->pfd[0]);
log_close();
signal(SIGINT, &handle_child_quit_signal);
signal(SIGTERM, &handle_child_quit_signal);
handle_event(event, pipe_list_cur->next->pfd[1]);
} else {
/* parent, close 1 */
close(pipe_list_cur->next->pfd[1]);
}
}
}
else if (event->len && (event->mask & IN_CREATE && event->mask & IN_ISDIR))
{
for (node = g_watchnode->next; node; node = node->next)
if (node->wd == event->wd)
break;
if (node)
{
/* combine the name inotify gives with the full path to the file */
filename = malloc(strlen(node->path) + strlen("/") + strlen(event->name) + 1);
sprintf(filename, "%s/%s", node->path, event->name);
watch_dir(node, ifd, strdup(filename), node->section);
free(filename);
}
}
else if (event->len && (event->mask & IN_DELETE && event->mask & IN_ISDIR))
{
for (node = g_watchnode->next; node; node = node->next)
if (node->wd == event->wd)
break;
if (node)
{
/* combine the name inotify gives with the full path to the file */
filename = malloc(strlen(node->path) + strlen("/") + strlen(event->name) + 1);
sprintf(filename, "%s/%s", node->path, event->name);
unwatch_dir(filename, ifd);
free(filename);
}
}
i += EVENT_SIZE + event->len;
}
i = 0;
}
/* now lets see if we have any pipe activity */
pipe_list_cur = pipe_list_head->next;
while (pipe_list_cur)
{
if (FD_ISSET(pipe_list_cur->pfd[0], &set))
{
len = read(pipe_list_cur->pfd[0], buf, BUF_LEN);
if (len == 0)
{
close(pipe_list_cur->pfd[0]);
/* remove this item from the list */
pipe_list_cur = pipe_list_remove(pipe_list_head, pipe_list_cur);
} else {
/* print it somewhere */
pbuf = malloc(len + 1);
snprintf(pbuf, len, "%s", buf);
log_write("%s\n", pbuf);
free(pbuf);
pipe_list_cur = pipe_list_cur->next;
}
} else {
pipe_list_cur = pipe_list_cur->next;
}
}
}
}
static struct buffer parse_method_call(struct buffer buff,
struct invocation *invocation, const char **error)
{
size_t func_name_len;
unsigned i;
struct argument args[QUERY_MAX_ARGS];
unsigned argi = 0;
const char *func_name = NULL;
struct registered_func *rf = registered_functions;
invocation->func = NULL;
buff = get_ident(buff, &func_name, &func_name_len, error);
if (*error)
goto clean;
buff = chomp(buff);
buff = expect_char(buff, '(', error);
if (*error)
goto clean;
while (rf->name)
{
if (strncmp(rf->name, func_name, func_name_len) == 0)
{
invocation->func = rf->func;
break;
}
rf++;
}
if (!invocation->func)
{
raise_unknown_function(buff.offset, func_name,
func_name_len, error);
goto clean;
}
buff = chomp(buff);
while (!peek(buff, ")"))
{
if (argi >= QUERY_MAX_ARGS)
{
raise_too_many_arguments(error);
goto clean;
}
buff = parse_argument(buff, &args[argi], error);
if (*error)
goto clean;
argi++;
buff = chomp(buff);
buff = expect_char(buff, ',', error);
if (*error)
{
*error = NULL;
break;
}
buff = chomp(buff);
}
buff = expect_char(buff, ')', error);
if (*error)
goto clean;
invocation->argc = argi;
invocation->argv = (struct argument*)
malloc(sizeof(struct argument) * argi);
if (!invocation->argv)
{
raise_enomem(error);
goto clean;
}
memcpy(invocation->argv, args,
sizeof(struct argument) * argi);
goto success;
clean:
for (i = 0; i < argi; i++)
argument_free(&args[i]);
success:
return buff;
}
