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#include "hotplug2.h"

/* Controls the loop receiving events. */
int process = 1;
struct settings_t global_settings;

/**
* Evaluates an argument into a true/false value.
*
* @1 argument
* @2 argument flag
* @3 pointer to output value
*
* Returns: 0 if success, -1 otherwise
*/
static int get_bool_opt(char *argv, char *name, int *value) {
int rv = -1;

if (!strncmp(argv, "--no-", 5)) {
rv = 0;
argv+=5;
}

if (!strncmp(argv, "--", 2)) {
rv = 1;
argv+=2;
}

if (rv == -1)
return -1;

if (!strcmp(argv, name)) {
*value = rv;
return 0;
} else {
return -1;
}
}

/**
* Attempt to figure out whether our modprobe command can handle modalias.
* If not, use our own wrapper.
*
* Returns: modprobe command if succesful, NULL otherwise
*/
static char *get_modprobe_command() {
char buf[18];
char *modprobe_command;
int fds[2];
pid_t p;
FILE *fp;

pipe(fds);
p = fork();

buf[0] = '\0';

switch (p) {
case -1:
return NULL;

case 0:
close(fds[0]);
close(2);
dup2(fds[1], 1);

execlp("/sbin/modprobe", "/sbin/modprobe", "--version", NULL);
exit(1);
break;

default:
close(fds[1]);
fp = fdopen(fds[0], "r");
fread(buf, 1, 17, fp);
buf[17]='\0';

/*
* module-init-tools can handle aliases.
* If we do not have a match, we use hotplug2-depwrap,
* even though our modprobe can do fnmatch aliases,
* which is the case of eg. busybox.
*/
if (!strcmp(buf, "module-init-tools")) {
modprobe_command = "/sbin/modprobe";
} else {
modprobe_command = "/sbin/hotplug2-depwrap";
}
fclose(fp);
waitpid(p, NULL, 0);
break;
}

return strdup(modprobe_command);
}

static int coldplug(const char *command) {
int status;
pid_t p;

p = fork();
switch (p) {
case -1:
return -1;

case 0:
execlp(command, command, NULL);
exit(1);

default:
waitpid(p, &status, 0);
return WEXITSTATUS(status);
}
return -1;
}

/**
* Loads various settings and rules file.
*
* @1 Settings structure
* @2 Argument count
* @3 String arguments, terminated by NULL
*
* Returns: 0 if success, -1 if non-recoverable error
*/
static int load_settings(struct settings_t *settings, int argc, char *argv[]) {
int i;
struct options_t boolopts[] = {
{"persistent", &settings->persistent},
{"override", &settings->useflags}, /* compatibility */
{"useflags", &settings->useflags},
{"dumb", &settings->dumb},
{NULL, NULL}
};

/*
* We parse all the options...
*/
settings->worker_argc = argc;
settings->worker_argv = argv;

argc--;
argv++;
while (argc > 0) {
for (i = 0; boolopts[i].name != NULL; i++) {
if (!get_bool_opt(*argv, boolopts[i].name, boolopts[i].value)) {
/*
* Bool options are --option or --no-options. If we handled
* it, quit iterating.
*/
break;
}
}

if (!strcmp(*argv, "--set-coldplug-cmd")) {
argv++;
argc--;
if (argc <= 0)
break;

settings->coldplug_command = strdup(*argv);
} else if (!strcmp(*argv, "--set-modprobe-cmd")) {
argv++;
argc--;
if (argc <= 0)
break;

settings->modprobe_command = strdup(*argv);
} else if (!strcmp(*argv, "--set-rules-file")) {
argv++;
argc--;
if (argc <= 0)
break;

settings->rules_file = strdup(*argv);
} else if (!strcmp(*argv, "--set-worker")) {
argv++;
argc--;
if (argc <= 0)
break;

settings->worker_name = strdup(*argv);
}
argv++;
argc--;
}

if (settings->modprobe_command == NULL)
settings->modprobe_command = get_modprobe_command();

if (!settings->dumb && settings->rules_file != NULL) {
return parser_file(settings->rules_file, &settings->rules);
}

return 0;
}

static void sighandler(int signum) {
switch (signum) {
case SIGINT:
case SIGTERM:
/* Terminate the loop. */
process = 0;
break;

case SIGUSR1:
/* Switch persistency. */
global_settings.persistent = !global_settings.persistent;
break;
}
}

/*
* Check for terminating conditions.
*/
static int terminate_condition(struct settings_t *settings, struct uevent_t *uevent) {
event_seqnum_t current_seqnum;
int rv;
fd_set fdrset;
struct timeval tv;

/*
* If this is non-persistent invokation and last event
* has been processed, terminate.
*/
if (settings->persistent == 0) {
rv = seqnum_get(&current_seqnum);
if (rv == 0 && current_seqnum == uevent->seqnum) {
/* Confirm value of seqnum after grace time. */
usleep(settings->grace);
rv = seqnum_get(&current_seqnum);
if (rv == 0 && current_seqnum == uevent->seqnum)
return 1;
} else if (rv != 0) {
/* If it has failed, let's try and guess. */
tv.tv_sec = 0;
tv.tv_usec = settings->grace;
FD_ZERO(&fdrset);
FD_SET(settings->netlink_socket, &fdrset);
select(settings->netlink_socket+1, &fdrset, NULL, NULL, &tv);
/* Did anything arrive within grace time? */
return !FD_ISSET(settings->netlink_socket, &fdrset);
}
}

return 0;
}

int main(int argc, char *argv[]) {
char buffer[UEVENT_BUFFER_SIZE+512];
ssize_t size;
struct sigaction sigact;
struct settings_t *settings;
struct uevent_t *uevent;
void *worker_ctx;

settings = &global_settings;
settings_init(settings);
if (load_settings(settings, argc, argv)) {
settings_clear(settings);
exit(1);
}

/* Load the worker. */
#ifndef STATIC_WORKER
if (settings->worker_name == NULL) {
fprintf(stderr, "Missing worker name.\n");
settings_clear(settings);
exit(1);
}
#endif
settings->worker = worker_load(settings->worker_name);
#ifndef STATIC_WORKER
if (settings->worker == NULL) {
fprintf(stderr, "Unable to load worker: %s\n", settings->worker_name);
settings_clear(settings);
exit(1);
}
#endif

/* Prepare a netlink connection to the kernel. */
settings->netlink_socket = netlink_init();
if (netlink_bind(settings->netlink_socket) == -1) {
fprintf(stderr, "Unable to connect to netlink socket.\n");
settings_clear(settings);
exit(1);
}

if (settings->coldplug_command != NULL)
coldplug(settings->coldplug_command);

/*
* Catch relevant signals. We use sigaction instead
* of signal, becaue signal implies SA_RESTART, which
* is undesirable.
*/
sigact.sa_handler = sighandler;
sigact.sa_flags = 0;
sigact.sa_restorer = NULL;
sigemptyset(&sigact.sa_mask);
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGUSR1, &sigact, NULL);

worker_ctx = settings->worker->module->init(settings);
while (process) {
size = recv(settings->netlink_socket, &buffer, sizeof(buffer), 0);
if (size < 0)
continue;

uevent = uevent_deserialize(buffer, size);

if (uevent == NULL)
continue;

/* Update highest seqnum. */
if (uevent->seqnum > settings->highest_seqnum)
settings->highest_seqnum = uevent->seqnum;

/* Pass the uevent to the loaded worker. */
if (settings->worker->module->process(worker_ctx, uevent)) {
fprintf(stderr, "Unable to pass event to worker.\n");
process = 0;
}

/* If we are supposed to terminate, let's do it. */
if (terminate_condition(settings, uevent))
process = 0;

uevent_free(uevent);
}

/* Unload worker. This may take a while (waiting for children etc.). */
settings->worker->module->deinit(worker_ctx);
worker_free(settings->worker);

/* Close socket, free remaining resources. */
close(settings->netlink_socket);
settings_clear(settings);

return 0;
}

Change log

r2 by ste...@davidovic.cz on Aug 7, 2010   Diff
 * Initial commit, migration from old
repo.
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