IRCv3 SASL capability + PLAIN method

Only plain, no other methods. We don't have built-in SSL to implement
EXTERNAL (certfp) and nothing else is worth implementing.

The actual authentication is pretty much like sending a server password
(when the server's authmode isn't closed), which means it happens in
cmd_identify, but this code also calls storage_check_pass() to send the
required success/failure replies.

SASL doesn't give us much benefit other than standards compliance, but
some clients might appreciate it.

And having a fifth way to do the same thing doesn't hurt! Now we have:

- identify in &bitlbee
- identify to nickserv (alias for root)
- 'nickserv' and 'ns' irc commands
- server password
- sasl plain

1 files changed, 2 insertions, 0 deletions

diff --git a/irc.h b/irc.h
index 4be7ce7e..f2df3b2e 100644
--- a/irc.h
+++ b/irc.h
@@ -49,6 +49,7 @@ typedef enum {
 	USTATUS_SHUTDOWN = 8,   /* Now used to indicate we're shutting down.
 	                           Currently just blocks irc_vawrite(). */
 	USTATUS_CAP_PENDING = 16,
+	USTATUS_SASL_PLAIN_PENDING = 32,
 
 	/* Not really status stuff, but other kinds of flags: For slightly
 	   better password security, since the only way to send passwords
@@ -66,6 +67,7 @@ typedef enum {
 } irc_status_t;
 
 typedef enum {
+	CAP_SASL = (1 << 0),
 	CAP_MULTI_PREFIX = (1 << 1),
 } irc_cap_flag_t;