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/* url.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include "apk_io.h"
const char *apk_url_local_file(const char *url)
{
if (strncmp(url, "file:", 5) == 0)
return &url[5];
if (strncmp(url, "http:", 5) != 0 &&
strncmp(url, "https:", 6) != 0 &&
strncmp(url, "ftp:", 4) != 0)
return url;
return NULL;
}
static int translate_wget(int status)
{
if (!WIFEXITED(status))
return -EFAULT;
switch (WEXITSTATUS(status)) {
case 0:
return 0;
case 3:
return -EIO;
case 4:
return -ECONNABORTED;
case 8:
return -ENOENT;
default:
return -EFAULT;
}
}
static int fork_wget(const char *url, pid_t *ppid)
{
pid_t pid;
int fds[2];
if (pipe(fds) < 0)
return -1;
pid = fork();
if (pid == -1) {
close(fds[0]);
close(fds[1]);
return -1;
}
if (pid == 0) {
setsid();
close(fds[0]);
dup2(open("/dev/null", O_RDONLY), STDIN_FILENO);
dup2(fds[1], STDOUT_FILENO);
execlp("busybox", "wget", "-q", "-O", "-", url, NULL);
exit(0);
}
close(fds[1]);
if (ppid != NULL)
*ppid = pid;
return fds[0];
}
struct apk_istream *apk_istream_from_url(const char *url)
{
pid_t pid;
int fd;
if (apk_url_local_file(url) != NULL)
return apk_istream_from_file(AT_FDCWD, apk_url_local_file(url));
fd = fork_wget(url, &pid);
return apk_istream_from_fd_pid(fd, pid, translate_wget);
}
struct apk_istream *apk_istream_from_url_gz(const char *file)
{
return apk_bstream_gunzip(apk_bstream_from_url(file));
}
struct apk_bstream *apk_bstream_from_url(const char *url)
{
pid_t pid;
int fd;
if (apk_url_local_file(url))
return apk_bstream_from_file(AT_FDCWD, url);
fd = fork_wget(url, &pid);
return apk_bstream_from_fd_pid(fd, pid, translate_wget);
}
int apk_url_download(const char *url, int atfd, const char *file)
{
pid_t pid;
int status, fd;
fd = openat(atfd, file, O_CREAT|O_RDWR|O_TRUNC, 0644);
if (fd < 0)
return -errno;
pid = fork();
if (pid == -1)
return -1;
if (pid == 0) {
setsid();
dup2(open("/dev/null", O_RDONLY), STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
execlp("wget", "wget", "-q", "-O", "-", url, NULL);
exit(0);
}
waitpid(pid, &status, 0);
status = translate_wget(status);
if (status != 0) {
unlinkat(atfd, file, 0);
return status;
}
return 0;
}
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