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- Better fix for infinite loop when reading multiple lines of input on

Browse source 
a broken remote control socket, by treating a zero byte line the
  same as transmission end. Addesses #947 and #948.
This commit is contained in:
George Thessalonikefs 2023-10-13 14:58:16 +02:00
parent 908e1cb11a
commit 07149f576a
2 changed files with 15 additions and 10 deletions
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20
daemon/remote.c
View file

@ -590,13 +590,13 @@ ssl_read_line(RES* res, char* buf, size_t max)
while(1) {
ssize_t rr = recv(res->fd, buf+len, 1, 0);
if(rr <= 0) {
if(rr == 0 && len != 0) {
if(rr == 0) {
buf[len] = 0;
return 1;
}
if(errno == EINTR || errno == EAGAIN)
continue;
log_err("could not recv: %s",
if(rr < 0) log_err("could not recv: %s",
sock_strerror(errno));
return 0;
}
@ -1223,8 +1223,8 @@ do_zones_add(RES* ssl, struct local_zones* zones)
char buf[2048];
int num = 0;
while(ssl_read_line(ssl, buf, sizeof(buf))) {
if(buf[0] == 0x04 && buf[1] == 0)
break; /* end of transmission */
if(buf[0] == 0 || (buf[0] == 0x04 && buf[1] == 0))
break; /* zero byte line or end of transmission */
if(!perform_zone_add(ssl, zones, buf)) {
if(!ssl_printf(ssl, "error for input line: %s\n", buf))
return;
@ -1272,8 +1272,8 @@ do_zones_remove(RES* ssl, struct local_zones* zones)
char buf[2048];
int num = 0;
while(ssl_read_line(ssl, buf, sizeof(buf))) {
if(buf[0] == 0x04 && buf[1] == 0)
break; /* end of transmission */
if(buf[0] == 0 || (buf[0] == 0x04 && buf[1] == 0))
break; /* zero byte line or end of transmission */
if(!perform_zone_remove(ssl, zones, buf)) {
if(!ssl_printf(ssl, "error for input line: %s\n", buf))
return;
@ -1336,8 +1336,8 @@ do_datas_add(RES* ssl, struct local_zones* zones)
char buf[2048];
int num = 0, line = 0;
while(ssl_read_line(ssl, buf, sizeof(buf))) {
if(buf[0] == 0x04 && buf[1] == 0)
break; /* end of transmission */
if(buf[0] == 0 || (buf[0] == 0x04 && buf[1] == 0))
break; /* zero byte line or end of transmission */
line++;
if(perform_data_add(ssl, zones, buf, line))
num++;
@ -1376,8 +1376,8 @@ do_datas_remove(RES* ssl, struct local_zones* zones)
char buf[2048];
int num = 0;
while(ssl_read_line(ssl, buf, sizeof(buf))) {
if(buf[0] == 0x04 && buf[1] == 0)
break; /* end of transmission */
if(buf[0] == 0 || (buf[0] == 0x04 && buf[1] == 0))
break; /* zero byte line or end of transmission */
if(!perform_data_remove(ssl, zones, buf)) {
if(!ssl_printf(ssl, "error for input line: %s\n", buf))
return;

5
doc/Changelog
View file

@ -1,3 +1,8 @@
13 October 2023: George
- Better fix for infinite loop when reading multiple lines of input on
a broken remote control socket, by treating a zero byte line the
same as transmission end. Addesses #947 and #948.
12 October 2023: Wouter
- Merge #944: Disable EDNS DO.
Disable the EDNS DO flag in upstream requests. This can be helpful