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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "utils.h"
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
const char *progname = NULL;
int port = 1234;
int listen_queue = 100;
const char *basedir = "/var/tmp";
static void
recvfile (int fd)
{
ssize_t rc;
int dfd = -1;
char *filename = NULL;
size_t filename_len;
off_t filelength = 0;
char *payload_start;
ssize_t rest_len;
char *buf = (char *) malloc (PATH_MAX);
if (!buf)
{
warning ("failed to allocate space");
goto clean;
}
rc = read (fd, buf, PATH_MAX); /* filename\0payload */
if (rc < 0)
{
warning ("failed to read filename");
goto clean;
}
else if (0 == rc)
{
info ("no data received, connection closed by client");
goto clean;
}
if (!memchr (buf, 0, PATH_MAX))
{
warning ("filename is too long");
goto clean;
}
/* XXX no subdirs. */
filename = strndup (buf, PATH_MAX);
if (!filename)
{
warning ("failed to create filename");
goto clean;
}
filename_len = strlen (filename);
dfd =
openat (AT_FDCWD, filename, O_CREAT + O_WRONLY,
S_IRUSR | S_IWUSR | S_IRGRP);
if (dfd < 0)
{
warning ("failed to open file `%s'", filename);
goto clean;
}
payload_start = buf + filename_len + 1;
rest_len = rc - filename_len - 1;
rc = write (dfd, payload_start, rest_len); /* write the rest of buf. */
if (rc != rest_len)
{
warning ("Failed to write `%s'", filename);
goto clean;
}
filelength += rc;
while ((rc = read (fd, buf, PATH_MAX)) > 0)
{
if (write (dfd, buf, rc) < 0)
{
warning ("failed to write `%s'", filename);
goto clean;
}
filelength += rc;
}
if (rc < 0)
warning ("failed to read from the socket");
info ("received %lu of `%s'", filelength, filename);
clean:
if (buf)
free (buf);
if (filename)
free (filename);
if (dfd > 0)
{
if (close (dfd))
warning ("failed to close %d", dfd);
}
}
int
main (int argc, char **argv)
{
NOTUSED (argc);
int listen_fd;
int conn_fd;
struct sockaddr_in servaddr;
int rc;
progname = argv[0];
if (chdir (basedir))
fatal ("failed to change directory to `%s'", basedir);
listen_fd = socket (AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
fatal ("failed to create listen socket");
memset (&servaddr, 0, sizeof (servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl (INADDR_ANY);
servaddr.sin_port = htons (port);
rc = bind (listen_fd, (const struct sockaddr *) &servaddr,
sizeof (servaddr));
if (0 != rc)
fatal ("failed to bind listen socket");
rc = listen (listen_fd, listen_queue);
if (0 != rc)
fatal ("failed to plug listen socket");
info ("accepting connections on port %d", port);
info ("will save files under `%s'", basedir);
while (1)
{
conn_fd = accept (listen_fd, NULL, NULL);
if (conn_fd < 0)
{
warning ("accept() failed");
continue;
}
recvfile (conn_fd);
}
return EXIT_SUCCESS;
}
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