Hello, I am doing a plugin that needs to listen at a particular port to
send the events (connections and desconnections) to the connected
clients. This is the main reason because I have used the fork() call but
seems not to work very well:
OPENVPN_EXPORT openvpn_plugin_handle_t
openvpn_plugin_open_v1 (unsigned int *type_mask, const char *argv[],
const char *envp[]) {
int procid;
if (pipe(data_pipe) == -1) {
perror("pipe");
exit(1);
}
procid=fork();
if ((procid) == 0) {
//I am the child (I should execute the listen and create new forks
for the accept() clients)
int nsocket;
/* This part is for the socket (must be before registering anything
to prevent double events) */
struct sockaddr_in serversocket;
nsocket = socket(AF_INET, SOCK_STREAM, 0);
serversocket.sin_family = AF_INET;
serversocket.sin_port = htons(PORT);
serversocket.sin_addr.s_addr = INADDR_ANY;
serversocket.sin_port = htons(PORT);
serversocket.sin_addr.s_addr = INADDR_ANY;
memset(&(serversocket.sin_zero), 0, 8);
bind(nsocket, (struct sockaddr *)&serversocket, sizeof(struct
sockaddr));
listen(nsocket, MAX_WAIT_CLIENTS);
for(;;){
/* Once connection is accepted, we send this information to the
pipe for the next event
* on the next event of the plugin, parent thread will add those
file descriptors connected and
* will remove sockets giving errors from the notification list.
*/
struct sockaddr_un remoteconnection;
//remoteconnection.sin_family=AF_INET;
int sin_size = sizeof(struct sockaddr_un);
//int sin_size=sizeof(remoteconnection);
int newfd=accept(nsocket, (struct sockaddr *)&remoteconnection,
&sin_size);
if (newfd != -1) {
char temp[10];
sprintf(temp,"Connected");
send(newfd, temp, strlen(temp), 0);
write(data_pipe[1], &newfd, 1);
}
}
exit(0);
} else {
...
here I return the context.
}
questions are: Can I use fork? Is any example of a plugin using fork()?
Where should I use the fork/must execute listen() call?.
What happens is that the client can never finish to connect to the
server and in the middle of the negociation, if I connect to the socket,
the server breaks down (segmentation fault).
Thanks in advance for your help or ideas.
--
Jose Sánchez <jose.informat...@centrolamilagrosa.org>
CGED La Milagrosa
http://www.centrolamilagrosa.org
Grupo de investigación en Gerontología
http://gerontologia.udc.es
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