Completed call setup
This commit is contained in:
Michiel Broek
parent
607f106244
commit
2de56de377
215
mbtask/taskibc.c
215
mbtask/taskibc.c
@ -46,6 +46,9 @@ int ls; /* Listen socket */
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struct sockaddr_in myaddr_in; /* Listen socket address */
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struct sockaddr_in clientaddr_in; /* Remote socket address */
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int changed = FALSE; /* Databases changed */
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char crbuf[512]; /* Chat receive buffer */
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char csbuf[512]; /* Chat send buffer */
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typedef enum {NCS_INIT, NCS_CALL, NCS_WAITPWD, NCS_CONNECT, NCS_HANGUP, NCS_FAIL, NCS_DEAD} NCSTYPE;
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@ -58,9 +61,20 @@ static char *ncsstate[] = {
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/*
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* Add a port to the portlist
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* Internal prototypes
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*/
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void fill_ncslist(ncs_list **, char *, char *, char *);
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void dump_ncslist(void);
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int send_msg(int, struct sockaddr_in, char *, char *);
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void check_servers(void);
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void command_pass(char *, char *);
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void receiver(struct servent *);
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/*
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* Add a server to the serverlist
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*/
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void fill_ncslist(ncs_list **fdp, char *server, char *myname, char *passwd)
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{
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ncs_list *tmp, *ta;
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@ -94,7 +108,6 @@ void fill_ncslist(ncs_list **fdp, char *server, char *myname, char *passwd)
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void dump_ncslist(void);
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void dump_ncslist(void)
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{
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ncs_list *tmp;
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@ -134,7 +147,7 @@ int send_msg(int s, struct sockaddr_in servaddr, char *host, char *msg)
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Syslog('r', "> %s: %s", host, printable(msg, 0));
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if (sendto(s, msg, strlen(msg), 0, (struct sockaddr *)&servaddr, sizeof(struct sockaddr_in)) == -1) {
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Syslog('r', "$Can't send message");
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Syslog('r', "$IBC: can't send message");
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return -1;
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}
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return 0;
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@ -144,10 +157,10 @@ int send_msg(int s, struct sockaddr_in servaddr, char *host, char *msg)
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void check_servers(void)
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{
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char *errmsg, scfgfn[PATH_MAX], buf[512];
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char *errmsg, scfgfn[PATH_MAX];
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FILE *fp;
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ncs_list *tnsl;
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int inlist;
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int j, inlist;
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time_t now;
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int a1, a2, a3, a4;
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struct servent *se;
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@ -177,7 +190,7 @@ void check_servers(void)
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Syslog('r', " not in neighbour list, add");
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fill_ncslist(&ncsl, ibcsrv.server, ibcsrv.myname, ibcsrv.passwd);
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changed = TRUE;
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Syslog('+', "Added Internet BBS Chatserver %s", ibcsrv.server);
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Syslog('+', "IBC: added Internet BBS Chatserver %s", ibcsrv.server);
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}
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}
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}
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@ -245,20 +258,19 @@ void check_servers(void)
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case NO_RECOVERY: errmsg = (char *)"Non recoverable errors"; break;
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default: errmsg = (char *)"Unknown error"; break;
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}
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Syslog('+', "No IP address for %s: %s", tnsl->server, errmsg);
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Syslog('+', "IBC: no IP address for %s: %s", tnsl->server, errmsg);
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tnsl->state = NCS_FAIL;
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break;
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}
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tnsl->socket = socket(AF_INET, SOCK_DGRAM, 0);
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if (tnsl->socket == -1) {
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Syslog('+', "$Can't create socket for %s", tnsl->server);
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Syslog('+', "$IBC: can't create socket for %s", tnsl->server);
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tnsl->state = NCS_FAIL;
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break;
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}
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Syslog('r', "socket %d", tnsl->socket);
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tnsl->token = gettoken();
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tnsl->state = NCS_CALL;
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tnsl->action = now + (time_t)1;
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} else {
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@ -266,12 +278,17 @@ void check_servers(void)
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}
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break;
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case NCS_CALL: Syslog('r', "%s call", tnsl->server);
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sprintf(buf, "PASS %s 0000 IBC| %s\r\n", tnsl->passwd, tnsl->compress ? "Z":"");
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, buf);
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sprintf(buf, "SERVER %s 0 %ld mbsebbs v%s\r\n", tnsl->myname, tnsl->token, VERSION);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, buf);
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tnsl->action = now + (time_t)50;
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case NCS_CALL: /*
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* In this state we accept PASS and SERVER commands from
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* the remote with the same token as we have sent.
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*/
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Syslog('r', "%s call", tnsl->server);
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tnsl->token = gettoken();
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sprintf(csbuf, "PASS %s 0000 IBC| %s\r\n", tnsl->passwd, tnsl->compress ? "Z":"");
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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sprintf(csbuf, "SERVER %s 0 %ld mbsebbs v%s\r\n", tnsl->myname, tnsl->token, VERSION);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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tnsl->action = now + (time_t)10;
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tnsl->state = NCS_WAITPWD;
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changed = TRUE;
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break;
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@ -281,7 +298,16 @@ void check_servers(void)
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* by a reply from the remote if the connection is accepted.
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*/
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Syslog('r', "%s waitpwd", tnsl->server);
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tnsl->token = 0;
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tnsl->state = NCS_CALL;
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srand(getpid());
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while (TRUE) {
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j = 1+(int) (1.0 * CFG.dialdelay * rand() / (RAND_MAX + 1.0));
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if ((j > (CFG.dialdelay / 10)) && (j > 9))
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break;
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}
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Syslog('r', "next call in %d seconds", j);
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tnsl->action = now + (time_t)j;
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break;
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}
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}
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@ -295,10 +321,116 @@ void check_servers(void)
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void command_pass(char *hostname, char *parameters)
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{
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ncs_list *tnsl;
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char *passwd, *version, *opts, *lnk;
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for (tnsl = ncsl; tnsl; tnsl = tnsl->next) {
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if (strcmp(tnsl->server, hostname) == 0) {
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break;
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}
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}
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passwd = strtok(parameters, " \0");
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version = strtok(NULL, " \0");
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opts = strtok(NULL, " \0");
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lnk = strtok(NULL, " \0");
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Syslog('r', "passwd \"%s\"", printable(passwd, 0));
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Syslog('r', "version \"%s\"", printable(version, 0));
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Syslog('r', "opts \"%s\"", printable(opts, 0));
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Syslog('r', "link \"%s\"", printable(lnk, 0));
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if (version == NULL) {
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sprintf(csbuf, "461 PASS: Not enough parameters");
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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return;
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}
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if (strcmp(passwd, tnsl->passwd)) {
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Syslog('!', "IBC: got bad password %s from %s", passwd, hostname);
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return;
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}
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tnsl->gotpass = TRUE;
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tnsl->version = atoi(version);
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if (lnk && strchr(lnk, 'Z'))
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tnsl->compress = TRUE;
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changed = TRUE;
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}
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void command_server(char *hostname, char *parameters)
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{
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ncs_list *tnsl;
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char *name, *hops, *id;
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time_t now;
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unsigned long token;
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for (tnsl = ncsl; tnsl; tnsl = tnsl->next) {
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if (strcmp(tnsl->server, hostname) == 0) {
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break;
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}
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}
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name = strtok(parameters, " \0");
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hops = strtok(NULL, " \0");
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id = strtok(NULL, " \0");
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Syslog('r', "name \"%s\"", printable(name, 0));
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Syslog('r', "hops \"%s\"", printable(hops, 0));
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Syslog('r', "id \"%s\"", printable(id, 0));
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Syslog('r', "vers \"%s\"", printable(parameters, 0));
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if (id == NULL) {
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sprintf(csbuf, "461 SERVER: Not enough parameters");
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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return;
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}
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token = atoi(id);
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now = time(NULL);
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if (tnsl->token) {
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/*
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* We are in calling state, so we expect the token from the
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* remote is the same as the token we sent.
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* In that case, the session is authorized.
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*/
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if (tnsl->token == token) {
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tnsl->gotserver = TRUE;
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changed = TRUE;
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tnsl->state = NCS_CONNECT;
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tnsl->action = now + (time_t)10;
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Syslog('+', "IBC: connected with %s", tnsl->server);
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return;
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}
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Syslog('r', "IBC: collision with %s", tnsl->server);
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return;
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}
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/*
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* We are in waiting state, so we sent our PASS and SERVER
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* messages and set the session to connected if we got a
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* valid PASS command.
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*/
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if (tnsl->gotpass) {
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sprintf(csbuf, "PASS %s 0000 IBC| %s\r\n", tnsl->passwd, tnsl->compress ? "Z":"");
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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sprintf(csbuf, "SERVER %s 0 %ld mbsebbs v%s\r\n", tnsl->myname, token, VERSION);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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tnsl->gotserver = TRUE;
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tnsl->state = NCS_CONNECT;
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tnsl->action = now + (time_t)10;
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Syslog('+', "IBC: connected with %s", tnsl->server);
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changed = TRUE;
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} else {
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Syslog('r', "IBC: got SERVER command without PASS command from %s", hostname);
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}
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return;
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}
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void receiver(struct servent *se)
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{
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struct pollfd pfd;
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@ -306,7 +438,7 @@ void receiver(struct servent *se)
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int rc, len, inlist;
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socklen_t sl;
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ncs_list *tnsl;
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char buf[1024], resp[512], *hostname, *prefix, *command, *parameters;
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char *hostname, *prefix, *command, *parameters;
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pfd.fd = ls;
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pfd.events = POLLIN;
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@ -320,15 +452,15 @@ void receiver(struct servent *se)
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if (pfd.revents & POLLIN || pfd.revents & POLLERR || pfd.revents & POLLHUP || pfd.revents & POLLNVAL) {
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sl = sizeof(myaddr_in);
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memset(&clientaddr_in, 0, sizeof(struct sockaddr_in));
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memset(&buf, 0, sizeof(buf));
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if ((len = recvfrom(ls, &buf, sizeof(buf)-1, 0,(struct sockaddr *)&clientaddr_in, &sl)) != -1) {
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memset(&crbuf, 0, sizeof(crbuf));
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if ((len = recvfrom(ls, &crbuf, sizeof(crbuf)-1, 0,(struct sockaddr *)&clientaddr_in, &sl)) != -1) {
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hp = gethostbyaddr((char *)&clientaddr_in.sin_addr, sizeof(struct in_addr), clientaddr_in.sin_family);
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if (hp == NULL)
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hostname = inet_ntoa(clientaddr_in.sin_addr);
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else
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hostname = hp->h_name;
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if ((buf[strlen(buf) -2] != '\r') && (buf[strlen(buf) -1] != '\n')) {
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if ((crbuf[strlen(crbuf) -2] != '\r') && (crbuf[strlen(crbuf) -1] != '\n')) {
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Syslog('r', "Message not terminated with CR-LF, dropped");
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return;
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}
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@ -341,37 +473,50 @@ void receiver(struct servent *se)
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}
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}
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if (!inlist) {
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Syslog('!', "Message from unknown host (%s), dropped", hostname);
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Syslog('!', "IBC: message from unknown host (%s), dropped", hostname);
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return;
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}
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buf[strlen(buf) -2] = '\0';
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Syslog('r', "< %s: \"%s\"", hostname, printable(buf, 0));
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tnsl->last = time(NULL);
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crbuf[strlen(crbuf) -2] = '\0';
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Syslog('r', "< %s: \"%s\"", hostname, printable(crbuf, 0));
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/*
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* Parse message
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*/
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if (buf[0] == ':') {
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prefix = strtok(buf, " ");
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if (crbuf[0] == ':') {
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prefix = strtok(crbuf, " ");
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command = strtok(NULL, " \0");
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parameters = strtok(NULL, "\0");
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} else {
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prefix = NULL;
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command = strtok(buf, " \0");
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command = strtok(crbuf, " \0");
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parameters = strtok(NULL, "\0");
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}
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Syslog('r', "prefix \"%s\"", printable(prefix, 0));
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Syslog('r', "command \"%s\"", printable(command, 0));
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Syslog('r', "parameters \"%s\"", printable(parameters, 0));
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// Syslog('r', "prefix \"%s\"", printable(prefix, 0));
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// Syslog('r', "command \"%s\"", printable(command, 0));
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// Syslog('r', "parameters \"%s\"", printable(parameters, 0));
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if (! strcmp(command, (char *)"PASS") && parameters) {
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if (! strcmp(command, (char *)"PASS")) {
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if (parameters == NULL) {
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sprintf(csbuf, "461 %s: Not enough parameters", command);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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} else {
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command_pass(hostname, parameters);
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}
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} else if (! strcmp(command, (char *)"SERVER")) {
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if (parameters == NULL) {
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sprintf(csbuf, "461 %s: Not enough parameters", command);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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} else {
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command_server(hostname, parameters);
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}
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} else if (tnsl->state == NCS_CONNECT) {
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/*
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* Only if connected we send a error response
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*/
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sprintf(resp, "421 %s: Unknown command\r\n", command);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, resp);
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sprintf(csbuf, "421 %s: Unknown command\r\n", command);
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send_msg(tnsl->socket, tnsl->servaddr_in, tnsl->server, csbuf);
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}
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} else {
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Syslog('r', "recvfrom returned len=%d", len);
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@ -391,23 +536,23 @@ void *ibc_thread(void *dummy)
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Syslog('+', "Starting IBC thread");
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if ((se = getservbyname("fido", "udp")) == NULL) {
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Syslog('!', "No fido udp entry in /etc/services, cannot start Internet BBS Chat");
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Syslog('!', "IBC: no fido udp entry in /etc/services, cannot start Internet BBS Chat");
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goto exit;
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}
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myaddr_in.sin_family = AF_INET;
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myaddr_in.sin_addr.s_addr = INADDR_ANY;
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myaddr_in.sin_port = se->s_port;
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Syslog('+', "Listen on %s, port %d\n", inet_ntoa(myaddr_in.sin_addr), ntohs(myaddr_in.sin_port));
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Syslog('+', "IBC: listen on %s, port %d\n", inet_ntoa(myaddr_in.sin_addr), ntohs(myaddr_in.sin_port));
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ls = socket(AF_INET, SOCK_DGRAM, 0);
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if (ls == -1) {
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Syslog('!', "$Can't create socket");
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Syslog('!', "$IBC: can't create listen socket");
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goto exit;
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}
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if (bind(ls, (struct sockaddr *)&myaddr_in, sizeof(struct sockaddr_in)) == -1) {
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Syslog('!', "$Can't bind socket");
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Syslog('!', "$IBC: can't bind listen socket");
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goto exit;
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}
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