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ipcp: try to re-send CHAP ack on timeout

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If it was lost, some clients (e.g. pppd) may not try to re-send their CHAP reply.
This commit is contained in:
Samuel Thibault 2025-03-30 20:37:29 +02:00
parent b3b052a483
commit 366faaea76
3 changed files with 24 additions and 10 deletions
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24
ppp.c
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@ -170,6 +170,19 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
}
}
// Re-send a CHAP ack, in case it was previously lost
void resendchapack(sessionidt s, tunnelidt t, uint16_t auth_id)
{
uint8_t b[MAXETHER];
uint8_t *p;
p = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
if (!p) return;
*p = 3; // ack
p[1] = auth_id;
*(uint16_t *) (p + 2) = ntohs(4); // no message
tunnelsend(b, (p - b) + 4, t); // send it
}
// Process CHAP messages
void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
@ -209,15 +222,8 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
if (session[s].ppp.phase == Network)
{
uint8_t b[MAXETHER];
uint8_t *p2;
LOG(2, s, t, "CHAP in Network phase, peer probably missed our ack, confirming it\n");
p2 = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
if (!p2) return;
*p2 = 3; // ack
p2[1] = p[1];
*(uint16_t *) (p2 + 2) = ntohs(4); // no message
tunnelsend(b, (p2 - b) + 4, t); // send it
resendchapack(s, t, p[1]);
}
else
LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
@ -405,7 +411,7 @@ static void dumplcp(uint8_t *p, int l)
void lcp_open(sessionidt s, tunnelidt t)
{
// transition to Authentication or Network phase:
session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network;
session[s].ppp.phase = sess_local[s].lcp_authtype && !sess_local[s].lcp_authdone ? Authenticate : Network;
LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase));