AF_ALG buggy with sendfile
From: Shawn Landden
Date: Sun Nov 24 2013 - 12:22:05 EST
If I use sendfile() to send to a accept()ed AF_ALG socket set up for
"hash", I get the wrong
answer, if I read() and then write() I get the right answer. None of
the system calls return an error.
test case attached.
--
---
Shawn Landden
+1 360 389 3001 (SMS preferred)
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <linux/if_alg.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(void)
{
int opfd;
int tfmfd;
struct sockaddr_alg sa = {
.salg_family = AF_ALG,
.salg_type = "hash",
.salg_name = "sha1"
};
char buf2[10000000];
char buf[20];
int i;
struct stat st;
tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa));
opfd = accept(tfmfd, NULL, 0);
int true = open("/bin/true", O_RDONLY);
fstat(true, &st);
sendfile(opfd, true, NULL, st.st_size);
read(opfd, &buf, 20);
for (i = 0; i < 20; i++) {
printf("%02x", (unsigned char)buf[i]);
}
printf("\n");
lseek(true, 0, SEEK_SET);
read(true, &buf2, st.st_size);
write(opfd, &buf2, st.st_size);
read(opfd, &buf, 20);
for (i = 0; i < 20; i++) {
printf("%02x", (unsigned char)buf[i]);
}
printf("\n");
close(opfd);
close(tfmfd);
return 0;
}