Python CSC Electronic Office
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pyceo/src/net.c

169 lines
5.4 KiB

#include <stdio.h>
#include <sys/utsname.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>
#include "util.h"
#include "net.h"
#include "gss.h"
#include "strbuf.h"
struct strbuf fqdn = STRBUF_INIT;
const size_t MAX_MSGLEN = 65536;
const size_t MSG_BUFINC = 4096;
void setup_fqdn(void) {
struct utsname uts;
struct hostent *lo;
if (uname(&uts))
fatalpe("uname");
lo = gethostbyname(uts.nodename);
if (!lo)
fatalpe("gethostbyname");
strbuf_addstr(&fqdn, lo->h_name);
}
void free_fqdn(void) {
strbuf_release(&fqdn);
}
static size_t recv_one_message(int sock, struct sctp_meta *msg_meta, struct strbuf *msg, int *notification) {
size_t len = 0;
int flags = 0;
int bytes;
strbuf_reset(msg);
do {
msg_meta->fromlen = sizeof(msg_meta->from);
bytes = sctp_recvmsg(sock, msg->buf + len, strbuf_avail(msg) - len,
(sa *)&msg_meta->from, &msg_meta->fromlen, &msg_meta->sinfo, &flags);
if (bytes < 0) {
if (errno == EAGAIN)
continue;
fatalpe("sctp_recvmsg");
}
if (!bytes)
break;
len += bytes;
if (msg->len > MAX_MSGLEN)
fatal("oversized message received");
if (strbuf_avail(msg) < MSG_BUFINC)
strbuf_grow(msg, MSG_BUFINC);
} while (~flags & MSG_EOR);
if (!bytes && len)
fatalpe("EOF in the middle of a message");
*notification = flags & MSG_NOTIFICATION;
if (*notification) {
notification_dbg(msg->buf);
union sctp_notification *sn = (union sctp_notification *) msg->buf;
switch (sn->sn_header.sn_type) {
case SCTP_SHUTDOWN_EVENT:
fatal("connection shut down");
break;
case SCTP_ASSOC_CHANGE:
switch (sn->sn_assoc_change.sac_state) {
case SCTP_COMM_LOST:
fatal("connection lost");
break;
case SCTP_SHUTDOWN_COMP:
fatal("shutdown complete");
break;
case SCTP_CANT_STR_ASSOC:
fatal("connection failed (is ceod running?)");
break;
}
break;
}
}
strbuf_setlen(msg, len);
return len;
}
int receive_one_message(int sock, struct sctp_meta *msg_meta, struct strbuf *msg) {
int notification = 0;
do {
recv_one_message(sock, msg_meta, msg, &notification);
} while (notification);
return msg->len > 0;
}
void notification_dbg(char *notification) {
union sctp_notification *sn = (union sctp_notification *) notification;
char *extra;
switch (sn->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE:
extra = "unknown state";
switch (sn->sn_assoc_change.sac_state) {
case SCTP_COMM_UP: extra = "established"; break;
case SCTP_COMM_LOST: extra = "lost"; break;
case SCTP_RESTART: extra = "restarted"; break;
case SCTP_SHUTDOWN_COMP: extra = "completed shutdown"; break;
case SCTP_CANT_STR_ASSOC: extra = "cannot start"; break;
}
debug("association changed: association 0x%x %s", sn->sn_assoc_change.sac_assoc_id, extra);
break;
case SCTP_PEER_ADDR_CHANGE:
extra = "unknown state";
switch (sn->sn_paddr_change.spc_state) {
case SCTP_ADDR_AVAILABLE: extra = "unavailable"; break;
case SCTP_ADDR_UNREACHABLE: extra = "unreachable"; break;
case SCTP_ADDR_REMOVED: extra = "removed"; break;
case SCTP_ADDR_ADDED: extra = "added"; break;
case SCTP_ADDR_MADE_PRIM: extra = "made primary"; break;
#ifdef SCTP_ADDR_CONFIRMED
case SCTP_ADDR_CONFIRMED: extra = "confirmed"; break;
#endif
}
struct sockaddr_in *sa = (struct sockaddr_in *) &sn->sn_paddr_change.spc_aaddr;
char addr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &sa->sin_addr, addr, sizeof(addr));
debug("peer address change: remote address %s %s", addr, extra);
break;
case SCTP_REMOTE_ERROR:
debug("remote error: association=0x%x error=0x%x",
sn->sn_remote_error.sre_assoc_id,
sn->sn_remote_error.sre_error);
break;
case SCTP_SEND_FAILED:
debug("send failed: association=0x%x error=0x%x",
sn->sn_send_failed.ssf_assoc_id,
sn->sn_send_failed.ssf_error);
break;
case SCTP_ADAPTATION_INDICATION:
debug("adaptation indication: 0x%x",
sn->sn_adaptation_event.sai_adaptation_ind);
break;
case SCTP_PARTIAL_DELIVERY_EVENT:
extra = "unknown indication";
switch (sn->sn_pdapi_event.pdapi_indication) {
case SCTP_PARTIAL_DELIVERY_ABORTED:
extra = "partial delivery aborted";
break;
}
debug("partial delivery event: %s", extra);
break;
case SCTP_SHUTDOWN_EVENT:
debug("association 0x%x was shut down",
sn->sn_shutdown_event.sse_assoc_id);
break;
default:
debug("unknown sctp notification type 0x%x\n",
sn->sn_header.sn_type);
}
}