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-rw-r--r--src/smtp/smtp_addr.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/src/smtp/smtp_addr.c b/src/smtp/smtp_addr.c
index 5e23388..f30ce73 100644
--- a/src/smtp/smtp_addr.c
+++ b/src/smtp/smtp_addr.c
@@ -179,10 +179,10 @@ static DNS_RR *smtp_addr_one(DNS_RR *addr_list, const char *host, int res_opt,
if ((addr = dns_sa_to_rr(host, pref, res0->ai_addr)) == 0)
msg_fatal("host %s: conversion error for address family "
"%d: %m", host, res0->ai_addr->sa_family);
- addr_list = dns_rr_append(addr_list, addr);
addr->pref = pref;
addr->port = port;
- if (msg_verbose)
+ addr_list = dns_rr_append(addr_list, addr);
+ if (msg_verbose && !DNS_RR_IS_TRUNCATED(addr_list))
msg_info("%s: using numerical host %s", myname, host);
freeaddrinfo(res0);
return (addr_list);
@@ -262,6 +262,8 @@ static DNS_RR *smtp_addr_one(DNS_RR *addr_list, const char *host, int res_opt,
msg_fatal("host %s: conversion error for address family "
"%d: %m", host, res0->ai_addr->sa_family);
addr_list = dns_rr_append(addr_list, addr);
+ if (DNS_RR_IS_TRUNCATED(addr_list))
+ break;
if (msg_verbose) {
MAI_HOSTADDR_STR hostaddr_str;
@@ -327,6 +329,8 @@ static DNS_RR *smtp_addr_list(DNS_RR *mx_names, DSN_BUF *why)
msg_panic("smtp_addr_list: bad resource type: %d", rr->type);
addr_list = smtp_addr_one(addr_list, (char *) rr->data, res_opt,
rr->pref, rr->port, why);
+ if (addr_list && DNS_RR_IS_TRUNCATED(addr_list))
+ break;
}
return (addr_list);
}
@@ -421,6 +425,13 @@ static DNS_RR *smtp_balance_inet_proto(DNS_RR *addr_list, int misc_flags,
*/
/*
+ * Ensure that dns_rr_append() won't interfere with the protocol
+ * balancing goals.
+ */
+ if (addr_limit > var_dns_rr_list_limit)
+ addr_limit = var_dns_rr_list_limit;
+
+ /*
* Count the number of IPv6 and IPv4 addresses.
*/
for (v4_count = v6_count = 0, rr = addr_list; rr != 0; rr = rr->next) {