summaryrefslogtreecommitdiff
path: root/src/url.c
blob: 6c62c957e3f57f42fb7ed5c78d63ccfe95fd1035 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
/* url.c - Alpine Package Keeper (APK)
 *
 * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
 * Copyright (C) 2008-2011 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("wget", "wget", "-q", "-O", "-", url, (void*) 0);
		/* fall back to busybox wget 
		 * See http://redmine.alpinelinux.org/issues/347 
		 */
		execlp("busybox", "wget", "-q", "-O", "-", url, (void*) 0);
		exit(0);
	}

	close(fds[1]);

	if (ppid != NULL)
		*ppid = pid;

	return fds[0];
}

struct apk_istream *apk_istream_from_fd_url(int atfd, const char *url)
{
	pid_t pid;
	int fd;

	if (apk_url_local_file(url) != NULL)
		return apk_istream_from_file(atfd, 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_fd_url(int atfd, const char *url)
{
	pid_t pid;
	int fd;

	if (apk_url_local_file(url) != NULL)
		return apk_bstream_from_file(atfd, apk_url_local_file(url));

	fd = fork_wget(url, &pid);
	return apk_bstream_from_fd_pid(fd, pid, translate_wget);
}