upas/smtp: handle temporary authentication failures

under heavy load, factotum can return a "too much activity" error,
which upas/smtpd and upas/smtp should consider a temporary error
instead of a permanent one.

2 files changed, 10 insertions, 0 deletions

diff --git a/sys/src/cmd/upas/common/aux.c b/sys/src/cmd/upas/common/aux.c
index 985e3f296..28e4492b1 100644
--- a/sys/src/cmd/upas/common/aux.c
+++ b/sys/src/cmd/upas/common/aux.c
@@ -108,3 +108,12 @@ returnable(char *path)
 {
 	return strcmp(path, "/dev/null") != 0;
 }
+
+int
+temperror(void)
+{
+	char err[ERRMAX];
+
+	rerrstr(err, sizeof(err));
+	return strstr(err, "too much activity") != nil || strstr(err, "temporary problem") != nil;
+}
diff --git a/sys/src/cmd/upas/common/common.h b/sys/src/cmd/upas/common/common.h
index f7e8ad5e9..c2bc45878 100644
--- a/sys/src/cmd/upas/common/common.h
+++ b/sys/src/cmd/upas/common/common.h
@@ -37,6 +37,7 @@ int	shellchars(char*);
 String	*escapespecial(String*);
 String	*unescapespecial(String*);
 int	returnable(char*);
+int	temperror(void);
 
 /* folder.c */
 Biobuf	*openfolder(char*, long);