#include <ccan/oserver/oserver.h>
+#include <ccan/oserver/oserver_types.h>
+#include <ccan/oserver/oserver_cdump.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/opt/opt.h>
#include <ccan/tevent/tevent.h>
#include <ccan/array_size/array_size.h>
-#include <ccan/noerr/noerr.h>
+#include <ccan/grab_file/grab_file.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
-
-enum state {
- RECEIVING_USER_QUESTION,
- SENDING_ANSWER,
- FINISHED
-};
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
static uint16_t state_flag_map[] = {
+ [SENDING_GREETING] = TEVENT_FD_WRITE,
[RECEIVING_USER_QUESTION] = TEVENT_FD_READ,
+ [SENDING_OTHER_QUESTION_PREFIX] = TEVENT_FD_WRITE,
+ [SENDING_OTHER_QUESTION] = TEVENT_FD_WRITE,
+ [RECEIVING_OTHER_ANSWER] = TEVENT_FD_READ,
+ [SENDING_ANSWER_PREFIX] = TEVENT_FD_WRITE,
[SENDING_ANSWER] = TEVENT_FD_WRITE,
[FINISHED] = 0
};
-struct client {
- /* What are we doing today, brain? */
- enum state state;
- /* Our event info, and the file descriptor. */
- struct tevent_fd *fde;
- int fd;
- /* The question we read from client. */
- char *question;
- /* How many bytes of the reply we sent so far. */
- size_t bytes_sent;
-};
-
-/* 5 clients should be enough for anybody! */
-static struct client *clients[5];
-static int sfd;
-static struct tevent_fd *sfde;
-
static ssize_t write_string(int fd, const char *str)
{
return write(fd, str, strlen(str));
return true;
}
+static bool get_subclient(struct client *me)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(me->oserver->clients); i++) {
+ struct client *c = me->oserver->clients[i];
+ if (!c || c == me)
+ continue;
+ if (c->oracle == -1 && input_finished(c->question)) {
+ me->subclient = c->id;
+ c->oracle = me->id;
+ return true;
+ }
+ }
+ return false;
+}
+
+static bool get_oracle(struct client *me)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(me->oserver->clients); i++) {
+ struct client *c = me->oserver->clients[i];
+ if (!c || c == me)
+ continue;
+ if (c->subclient == -1 && input_finished(c->question)) {
+ me->oracle = c->id;
+ c->subclient = me->id;
+ return true;
+ }
+ }
+ return false;
+}
+
+static void wakeup(struct client *c)
+{
+ tevent_fd_set_flags(c->fde, state_flag_map[c->state]);
+}
+
static void service_client(struct tevent_context *ev,
struct tevent_fd *fde, uint16_t flags, void *_c)
{
ssize_t len;
switch (c->state) {
+ case SENDING_GREETING:
+ if (!send_string(c, "Welcome. Please ask your question.\n"))
+ goto fail;
+ break;
case RECEIVING_USER_QUESTION:
len = read_string(c->fd, &c->question);
if (len <= 0)
goto fail;
- if (input_finished(c->question)) {
- unsigned int i;
-
- for (i = 0; c->question[i]; i++)
- c->question[i] = toupper(c->question[i]);
- set_state(c, SENDING_ANSWER);
+ if (input_finished(c->question))
+ set_state(c, SENDING_OTHER_QUESTION_PREFIX);
+ break;
+ case SENDING_OTHER_QUESTION_PREFIX:
+ if (c->subclient == -1)
+ goto need_subclient;
+ if (!send_string(c, "While the Oracle ponders,"
+ " please answer the following question:\n"))
+ goto fail;
+ break;
+ case SENDING_OTHER_QUESTION:
+ if (c->subclient == -1)
+ goto need_subclient;
+ if (!send_string(c,
+ c->oserver->clients[c->subclient]->question))
+ goto fail;
+ break;
+ case RECEIVING_OTHER_ANSWER:
+ if (c->subclient == -1)
+ goto need_subclient;
+ len = read_string(c->fd,
+ &c->oserver->clients[c->subclient]->answer);
+ if (len <= 0)
+ goto fail;
+ if (input_finished(c->oserver->clients[c->subclient]->answer)) {
+ set_state(c, SENDING_ANSWER_PREFIX);
+ wakeup(c->oserver->clients[c->subclient]);
}
break;
+ case SENDING_ANSWER_PREFIX:
+ if (!input_finished(c->answer))
+ goto need_answer;
+ if (!send_string(c, "The Oracle spake thus:\n"))
+ goto fail;
+ break;
case SENDING_ANSWER:
- if (!send_string(c, c->question))
+ if (!send_string(c, c->answer))
goto fail;
break;
default:
if (c->state != FINISHED)
return;
-
fail:
talloc_free(c);
+ return;
+
+need_subclient:
+ if (!get_subclient(c)) {
+ /* We can't get one: go to sleep until someone find_oracle() */
+ tevent_fd_set_flags(c->fde, 0);
+ } else
+ /* In case they are waiting... */
+ wakeup(c->oserver->clients[c->subclient]);
+ return;
+
+need_answer:
+ /* If we don't have an oracle and find one, that's OK. */
+ if (c->oracle == -1 && get_oracle(c)) {
+ /* In case they are waiting... */
+ wakeup(c->oserver->clients[c->oracle]);
+ return;
+ }
+
+ /* Either our oracle is not finished, or we don't have one: sleep. */
+ tevent_fd_set_flags(c->fde, 0);
}
static int cleanup_client(struct client *client)
{
- unsigned int i;
- for (i = 0; i < ARRAY_SIZE(clients); i++) {
- if (clients[i] == client) {
- clients[i] = NULL;
- tevent_fd_set_flags(sfde, TEVENT_FD_READ);
- return 0;
- }
- }
- abort();
+ /* We were an oracle? */
+ if (client->subclient >= 0)
+ client->oserver->clients[client->subclient]->oracle = -1;
+
+ /* We had an oracle? */
+ if (client->oracle >= 0)
+ client->oserver->clients[client->oracle]->subclient = -1;
+
+ assert(client->oserver->clients[client->id] == client);
+ client->oserver->clients[client->id] = NULL;
+ return 0;
}
static void add_client(struct tevent_context *ev,
- struct tevent_fd *fde, uint16_t flags, void *unused)
+ struct tevent_fd *fde, uint16_t flags, void *_oserver)
{
+ struct oserver *oserver = _oserver;
struct client *client;
- unsigned int i;
- client = talloc(sfde, struct client);
- client->fd = accept(sfd, NULL, 0);
+ client = talloc(oserver, struct client);
+ client->fd = accept(oserver->fd, NULL, 0);
if (client->fd < 0)
err(1, "Accepting client connection");
- client->state = RECEIVING_USER_QUESTION;
+ client->state = SENDING_GREETING;
client->bytes_sent = 0;
client->question = talloc_strdup(client, "");
+ client->oserver = oserver;
+ client->oracle = -1;
+ client->subclient = -1;
+ client->answer = talloc_strdup(client, "");
client->fde = tevent_add_fd(ev, client, client->fd,
state_flag_map[client->state],
service_client, client);
tevent_fd_set_auto_close(client->fde);
/* Find empty slot in array for this client. */
- for (i = 0; clients[i]; i++);
- clients[i] = client;
+ for (client->id = 0; oserver->clients[client->id]; client->id++);
+ oserver->clients[client->id] = client;
talloc_set_destructor(client, cleanup_client);
/* Full? Stop listening... */
- if (i == ARRAY_SIZE(clients)-1)
- tevent_fd_set_flags(sfde, 0);
+ if (client->id == ARRAY_SIZE(oserver->clients)-1)
+ tevent_fd_set_flags(oserver->fde, 0);
+}
+
+static void clear_clients(struct oserver *oserver)
+{
+ memset(oserver->clients, 0,
+ ARRAY_SIZE(oserver->clients) * sizeof(oserver->clients[0]));
+}
+
+static int destroy_oserver(struct oserver *oserver)
+{
+ close(oserver->fd);
+ return 0;
}
-void *oserver_setup(struct tevent_context *ev, unsigned short port)
+static void talloc_dump(struct tevent_context *ev,
+ struct tevent_signal *se,
+ int signum,
+ int count,
+ void *siginfo,
+ void *_oserver)
{
+ struct oserver *oserver = _oserver;
+ FILE *f;
+
+ /* Fork off a child for the report, so we aren't stopped. */
+ if (fork() == 0) {
+ f = fopen("/var/run/oserver/talloc.dump", "w");
+ if (f) {
+ talloc_report_full(oserver, f);
+ fclose(f);
+ }
+ _exit(0);
+ }
+}
+
+static void dump(struct tevent_context *ev,
+ struct tevent_signal *se,
+ int signum,
+ int count,
+ void *siginfo,
+ void *_oserver)
+{
+ struct oserver *oserver = _oserver;
+ char *str;
+ int fd;
+
+ str = cdump_bundle(ev, cdump_struct_oserver, oserver);
+ fd = open(oserver->dumpfile, O_CREAT|O_TRUNC|O_WRONLY, 0600);
+ write(fd, str, strlen(str));
+ close(fd);
+ talloc_free(str);
+ if (oserver->argv)
+ execvp(oserver->argv[0], oserver->argv);
+}
+
+static bool load_file(struct oserver *oserver, const char *file)
+{
+ char *str;
+
+ if (!file)
+ return false;
+
+ str = grab_file(oserver, file, NULL);
+ if (!str)
+ return false;
+
+ if (!cdump_unbundle(oserver, cdump_struct_oserver, oserver, str)) {
+ talloc_free(str);
+ return false;
+ }
+ talloc_free(str);
+ return true;
+}
+
+static bool complete_server(struct tevent_context *ev,
+ struct oserver *oserver, const char *dumpfile)
+{
+ /* Re-set this even if restored from file, in case it changed. */
+ oserver->dumpfile = dumpfile;
+ if (oserver->dumpfile)
+ tevent_add_signal(ev, oserver, SIGHUP, SA_RESTART,
+ dump, oserver);
+
+ /* Don't kill us if client dies. */
+ signal(SIGPIPE, SIG_IGN);
+
+ /* Show talloc tree on SIGUSR1. */
+ tevent_add_signal(ev, oserver, SIGUSR1, SA_RESTART,
+ talloc_dump, oserver);
+
+ oserver->fde = tevent_add_fd(ev, oserver, oserver->fd,
+ TEVENT_FD_READ, add_client, oserver);
+ if (!oserver->fde)
+ return false;
+ return true;
+}
+
+struct oserver *oserver_restore(struct tevent_context *ev, const char *dumpfile)
+{
+ unsigned int i;
+ struct oserver *oserver = talloc(ev, struct oserver);
+ if (!load_file(oserver, dumpfile)) {
+ talloc_free(oserver);
+ return NULL;
+ }
+
+ /* Restore ignored fields in clients, and talloc hierarchy. */
+ for (i = 0; i < ARRAY_SIZE(oserver->clients); i++) {
+ struct client *client = oserver->clients[i];
+ if (!client)
+ continue;
+ /* These two were marked CDUMP_IGNORE. */
+ client->oserver = oserver;
+ client->fde = tevent_add_fd(ev, client, client->fd,
+ state_flag_map[client->state],
+ service_client, client);
+ tevent_fd_set_auto_close(client->fde);
+ /* cdump knows nothing of talloc. */
+ talloc_steal(oserver, client);
+ talloc_steal(client, client->question);
+ talloc_steal(client, client->answer);
+ talloc_set_destructor(client, cleanup_client);
+ }
+
+ talloc_set_destructor(oserver, destroy_oserver);
+ if (!complete_server(ev, oserver, dumpfile)) {
+ talloc_free(oserver);
+ return NULL;
+ }
+ return oserver;
+}
+
+struct oserver *oserver_setup(struct tevent_context *ev, unsigned short port,
+ const char *dumpfile, char *argv[])
+{
+ struct oserver *oserver;
int one = 1;
union {
struct sockaddr addr;
struct sockaddr_in in;
} u;
- sfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (sfd < 0)
- return false;
+ oserver = talloc(ev, struct oserver);
+ oserver->argv = argv;
+ if (argv) {
+ /* Count the terminal NULL in argv_len. */
+ for (oserver->argv_len = 1;
+ argv[oserver->argv_len - 1];
+ oserver->argv_len++);
+ } else
+ oserver->argv_len = 0;
+ clear_clients(oserver);
+ oserver->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (oserver->fd < 0) {
+ talloc_free(oserver);
+ return NULL;
+ }
- if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
+ talloc_set_destructor(oserver, destroy_oserver);
+
+ if (setsockopt(oserver->fd, SOL_SOCKET, SO_REUSEADDR,
+ &one, sizeof(one)))
warn("Setting socket reuse");
u.in.sin_family = AF_INET;
u.in.sin_port = htons(port);
u.in.sin_addr.s_addr = INADDR_ANY;
- if (bind(sfd, &u.addr, sizeof(u.in)) == -1) {
- close_noerr(sfd);
+ if (bind(oserver->fd, &u.addr, sizeof(u.in)) == -1) {
+ talloc_free(oserver);
return NULL;
}
- if (listen(sfd, 0) != 0) {
- close_noerr(sfd);
+ if (listen(oserver->fd, 0) != 0) {
+ talloc_free(oserver);
return NULL;
}
- sfde = tevent_add_fd(ev, ev, sfd, TEVENT_FD_READ, add_client, NULL);
- tevent_fd_set_auto_close(sfde);
-
- /* Don't kill us if client dies. */
- signal(SIGPIPE, SIG_IGN);
+ if (!complete_server(ev, oserver, dumpfile)) {
+ talloc_free(oserver);
+ return NULL;
+ }
- return sfde;
+ return oserver;
}
projects / ccan-lca-2011.git / blobdiff