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tftpd: Use poll() instead of alarm() + setjmp().

Browse source 
While there, don't log an error when timing out waiting for a possible retransmit after a successful transfer.

Sponsored by:	Klara, Inc.
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D38966
This commit is contained in:
Dag-Erling Smørgrav 2023-03-10 13:24:36 +00:00
parent 9f6f64941c
commit e3b4cb1b32
2 changed files with 11 additions and 29 deletions
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38
libexec/tftpd/tftp-io.c
View file

@ -38,8 +38,7 @@ __FBSDID("$FreeBSD$");
#include <assert.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <poll.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
@ -377,27 +376,19 @@ send_data(int peer, uint16_t block, char *data, int size)
/*
* Receive a packet
*
* If timeout is negative, no error will be logged on timeout.
*/
static jmp_buf timeoutbuf;
static void
timeout(int sig __unused)
{
/* tftp_log(LOG_DEBUG, "Timeout\n"); Inside a signal handler... */
longjmp(timeoutbuf, 1);
}
int
receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
int thistimeout)
int timeout)
{
struct pollfd pfd;
struct tftphdr *pkt;
struct sockaddr_storage from_local;
struct sockaddr_storage *pfrom;
socklen_t fromlen;
int n;
static int timed_out;
if (debug & DEBUG_PACKETS)
tftp_log(LOG_DEBUG,
@ -405,13 +396,11 @@ receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
pkt = (struct tftphdr *)data;
signal(SIGALRM, timeout);
timed_out = setjmp(timeoutbuf);
alarm(thistimeout);
if (timed_out != 0) {
tftp_log(LOG_ERR, "receive_packet: timeout");
alarm(0);
pfd.fd = peer;
pfd.events = POLLIN;
if (poll(&pfd, 1, 1000 * (timeout < 0 ? -timeout : timeout)) < 1) {
if (timeout > 0)
tftp_log(LOG_ERR, "receive_packet: timeout");
return (RP_TIMEOUT);
}
@ -419,15 +408,8 @@ receive_packet(int peer, char *data, int size, struct sockaddr_storage *from,
fromlen = sizeof(*pfrom);
n = recvfrom(peer, data, size, 0, (struct sockaddr *)pfrom, &fromlen);
alarm(0);
DROPPACKETn("receive_packet", RP_TIMEOUT);
if (n < 0) {
tftp_log(LOG_ERR, "receive_packet: timeout");
return (RP_TIMEOUT);
}
if (n < 0) {
/* No idea what could have happened if it isn't a timeout */
tftp_log(LOG_ERR, "receive_packet: %s", strerror(errno));

2
libexec/tftpd/tftp-transfer.c
View file

@ -436,7 +436,7 @@ tftp_receive(int peer, uint16_t *block, struct tftp_stats *ts,
for (i = 0; ; i++) {
n_data = receive_packet(peer, (char *)rp, pktsize,
NULL, timeoutpacket);
NULL, -timeoutpacket);
if (n_data <= 0)
break;
if (n_data > 0 &&