summaryrefslogtreecommitdiffstats
path: root/src/url.c
blob: 0a17a7a2589eae00e671e86d823655a183b0fcd9 (plain)
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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/* 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("wget", "wget", "-q", "-O", "-", url, NULL);
		/* fall back to busybox wget 
		 * See http://redmine.alpinelinux.org/issues/347 
		 */
		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;
}