Package: w3m
Version: 0.5.3+git20230121-2.1
Severity: minor
When uploading a file using a HTML form with
enctype="multipart/form-data", w3m sends the file in tiny pieces,
which makes the upload take a very long time. The following
steps can show that this is happening:
First, make a C program that will act as a server and print the
received packet sizes:
File: srv.c :
#include <netinet/ip.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
int main() {
int lsock = socket(AF_INET, SOCK_STREAM, 0);
if (lsock < 0) {
perror("socket");
goto err;
}
int optval = 1;
setsockopt(lsock, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof optval);
struct sockaddr_in addr = {AF_INET, 0x1111};
if (bind(lsock, (const struct sockaddr*)&addr, sizeof addr) < 0) {
perror("bind");
goto err;
}
if (listen(lsock, 1) < 0) {
perror("listen");
goto err;
}
int csock = accept(lsock, 0, 0);
if (csock < 0) {
perror("csock");
goto err;
}
ssize_t total = 0;
for (;;) {
char buf[64 << 10];
ssize_t l = read(csock, buf, sizeof buf);
if (l <= 0) {
break;
}
total += l;
fprintf(stderr, "Got %ld bytes, total %ld\n", l, total);
}
err:
close(lsock);
}
Then complie and run it in a terminal:
cc -o srv srv.c && ./srv
In another terminal, make a HTML form and open it in w3m:
printf '<form action="http://localhost:4369"; method="POST"
enctype="multipart/form-data"><input type="file" name="f"><input
type="submit"></form>\n' > form.html
w3m form.html
Now use the form to upload a pretty large file and you will
notice that it takes a long time and the server will print that
it receives the file in tiny packets. Try the same form with
another browser and compare the results.
