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Added argument to set limit on number of concurrent connections

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Christopher Ramey 2015-03-09 01:39:25 +00:00 committed by cdramey
parent 5ec1783299
commit 5071a2fcd4
1 changed files with 66 additions and 22 deletions
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88
src/wstationd.c
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@ -17,6 +17,7 @@
#include <getopt.h>
#include <poll.h>
#include <syslog.h>
#include <signal.h>
#include "wstationd.h"
@ -27,16 +28,18 @@
// dictates the memory cost per connection.
#define BUFFERSIZE 65539
// Hard limit on number of concurrent connections
#define SLOTLIMIT 128
// Timeout for each connection, in seconds
#define TIMEOUT 30
static char *exec_name;
// Should this application daemonize?
static int daemonize = 1;
// Hard limit on number of concurrent connections
static int slotlimit = 128;
// Used to handle signaled shutdowns
static int keep_polling = 1;
struct connection
{
@ -50,10 +53,16 @@ struct connection
static int write_connection(struct connection *);
void shutdown_handler(int sig)
{
keep_polling = 0;
}
static void print_help()
{
fprintf(stdout, "usage: %s [-p port] [-b addr] directory\n", exec_name);
fprintf(stdout, "usage: %s [-d] [-l limit] [-p port] [-b addr] directory\n", exec_name);
fprintf(stdout, " -d, --nodaemon Do not detach and daemonize\n");
fprintf(stdout, " -l, --limit <limit> Set concurrent connection limit (default: 128)\n");
fprintf(stdout, " -p, --port <port> Port to listen on (default: 10800)\n");
fprintf(stdout, " -b, --bind <address> Address to bind to (default: 0.0.0.0)\n");
fprintf(stdout, " -h, --help Print this message and exit\n");
@ -64,6 +73,7 @@ static void print_help()
int main(int argc, char* argv[])
{
const struct option longopts[] = {
{ "limit", required_argument, NULL, 'l' },
{ "nodaemon", required_argument, NULL, 'd' },
{ "port", required_argument, NULL, 'p' },
{ "bind", required_argument, NULL, 'b' },
@ -77,8 +87,8 @@ int main(int argc, char* argv[])
int port = 10800; // Default port
uint32_t address = INADDR_ANY; // Default listen address
struct connection* conns[SLOTLIMIT];
memset(conns, 0, sizeof(struct connection*) * SLOTLIMIT);
struct connection** conns = NULL;
struct pollfd* fds = NULL;
if((exec_name = basename(argv[0])) == NULL){
fprintf(stderr, "%s: cannot get basename - %s\n",
@ -93,6 +103,15 @@ int main(int argc, char* argv[])
daemonize = 0;
break;
case 'l':
slotlimit = (int)strtol(optarg, NULL, 10);
if(slotlimit < 1 || slotlimit > 1024){
fprintf(stderr, "%s: invalid limit (must be between 1 and 1024)\n", exec_name);
print_help();
goto shutdown_error;
}
break;
case 'p':
port = (int)strtol(optarg, NULL, 10);
if(port < 1 || port > 65535){
@ -135,6 +154,9 @@ int main(int argc, char* argv[])
goto shutdown_error;
}
// Handle signals
signal(SIGINT, shutdown_handler);
// Daemonize if requested
if(daemonize){
pid_t pid = fork();
@ -228,31 +250,41 @@ int main(int argc, char* argv[])
goto shutdown_error;
}
struct pollfd fds[SLOTLIMIT+1];
memset(&fds, 0, sizeof(struct pollfd) * (SLOTLIMIT + 1));
fds = malloc(sizeof(struct pollfd) * (slotlimit + 1));
conns = malloc(sizeof(struct connection*) * slotlimit);
if(conns == NULL || fds == NULL){
if(daemonize){ syslog(LOG_ERR, "out of memory"); }
else { fprintf(stderr, "%s: out of memory\n", exec_name); }
}
memset(conns, 0, sizeof(struct connection*) * slotlimit);
memset(fds, 0, sizeof(struct pollfd) * (slotlimit + 1));
// Add sockfd
fds[0].fd = sockfd;
fds[0].events = POLLIN;
fds[0].revents = 0;
while(1){
if(poll(fds, (SLOTLIMIT + 1), 1000) == -1){
if(daemonize){
syslog(LOG_ERR, "socket poll error - %s",
strerror(errno)
);
} else {
fprintf(stderr, "%s: socket poll error - %s\n",
exec_name, strerror(errno)
);
while(keep_polling){
if(poll(fds, (slotlimit + 1), 1000) == -1){
// Ignore interrupt generated errors
if(errno != EINTR){
if(daemonize){
syslog(LOG_ERR, "socket poll error - %s",
strerror(errno)
);
} else {
fprintf(stderr, "%s: socket poll error - %s\n",
exec_name, strerror(errno)
);
}
goto shutdown_error;
}
goto shutdown_error;
}
// Handle existing connections
int slotfirst = 0, slotfree = 0;
for(int i = 1; i <= SLOTLIMIT; i++){
for(int i = 1; i <= slotlimit; i++){
// Handle event
if(fds[i].revents & POLLIN){
ssize_t sz = recv(
@ -390,12 +422,24 @@ int main(int argc, char* argv[])
shutdown_clean:
if(sockfd > 0) close(sockfd);
for(int i = 0; i < SLOTLIMIT; i++){ if(conns[i] != NULL) free(conns[i]); }
if(fds != NULL){ free(fds); fds = NULL; }
if(conns != NULL){
for(int i = 0; i < slotlimit; i++){
if(conns[i] != NULL) free(conns[i]);
}
free(conns); conns = NULL;
}
return 0;
shutdown_error:
if(sockfd > 0) close(sockfd);
for(int i = 0; i < SLOTLIMIT; i++){ if(conns[i] != NULL) free(conns[i]); }
if(fds != NULL){ free(fds); fds = NULL; }
if(conns != NULL){
for(int i = 0; i < slotlimit; i++){
if(conns[i] != NULL) free(conns[i]);
}
free(conns); conns = NULL;
}
return 1;
}