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1 | /* | |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #ifdef HAVE_CONFIG_H | |
23 | #include "config.h" | |
24 | #endif | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <errno.h> | |
28 | #include <ctype.h> | |
29 | #include <string.h> | |
30 | #include <strings.h> | |
31 | #include <gtk/gtk.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | ||
35 | #include "download.h" | |
36 | ||
37 | #ifdef HAVE_LIBCURL | |
38 | #include "curl_download.h" | |
39 | #else | |
40 | #include "http.h" | |
41 | #endif | |
42 | ||
43 | #ifdef WINDOWS | |
44 | ||
45 | #include <io.h> | |
46 | #define access(a,b) _access(a,b) | |
47 | #define close(a) closesocket(a) | |
48 | ||
49 | char *dirname ( char * dir ) | |
50 | { | |
51 | char *tmp = dir + strlen(dir) - 1; | |
52 | while ( tmp != dir && *tmp != '\\' ) | |
53 | tmp--; | |
54 | *tmp = '\0'; | |
55 | return dir; | |
56 | } | |
57 | ||
58 | #else | |
59 | ||
60 | #include <unistd.h> | |
61 | #include <sys/types.h> | |
62 | ||
63 | /* dirname */ | |
64 | #include <libgen.h> | |
65 | ||
66 | #endif | |
67 | ||
68 | static int check_map_file(FILE* f) | |
69 | { | |
70 | char **s; | |
71 | char *bp; | |
72 | int res = 0; /* good */ | |
73 | fpos_t pos; | |
74 | char buf[33]; | |
75 | size_t nr; | |
76 | char * html_str[] = { | |
77 | "<html", | |
78 | "<!DOCTYPE html", | |
79 | "<head", | |
80 | "<title", | |
81 | NULL | |
82 | }; | |
83 | ||
84 | ||
85 | bzero(buf, sizeof(buf)); | |
86 | fgetpos(f, &pos); | |
87 | rewind(f); | |
88 | nr = fread(buf, 1, sizeof(buf) - 1, f); | |
89 | fsetpos(f, &pos); | |
90 | for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) { | |
91 | if (!(isspace(*bp))) | |
92 | break; | |
93 | } | |
94 | if ((bp >= (buf + sizeof(buf) -1)) || ((bp - buf) >= nr)) | |
95 | return(res); | |
96 | for (s = html_str; *s; s++) { | |
97 | if (strncmp(*s, bp, strlen(*s)) == 0) | |
98 | return(-1); | |
99 | } | |
100 | return(res); | |
101 | } | |
102 | ||
103 | static int download( const char *hostname, const char *uri, const char *fn, int sendhostname) | |
104 | { | |
105 | FILE *f; | |
106 | int ret; | |
107 | char *tmpfilename; | |
108 | ||
109 | /* Check file */ | |
110 | if ( access ( fn, F_OK ) == 0 ) | |
111 | { | |
112 | /* File exists: return */ | |
113 | return -3; | |
114 | } else { | |
115 | if ( errno == ENOENT) | |
116 | { | |
117 | char *tmp = g_strdup ( fn ); | |
118 | #ifdef WINDOWS | |
119 | mkdir( dirname ( dirname ( tmp ) ) ); | |
120 | g_free ( tmp ); tmp = g_strdup ( fn ); | |
121 | mkdir( dirname ( tmp ) ); | |
122 | #else | |
123 | mkdir( dirname ( dirname ( tmp ) ), 0777 ); | |
124 | g_free ( tmp ); tmp = g_strdup ( fn ); | |
125 | mkdir( dirname ( tmp ), 0777 ); | |
126 | #endif | |
127 | g_free ( tmp ); | |
128 | } | |
129 | /* create placeholder file */ | |
130 | if ( ! (f = fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */ | |
131 | return -4; | |
132 | fclose ( f ); | |
133 | } | |
134 | ||
135 | tmpfilename = g_strdup_printf("%s.tmp", fn); | |
136 | f = fopen ( tmpfilename, "w+b" ); | |
137 | if ( ! f ) { | |
138 | g_free ( tmpfilename ); | |
139 | remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ | |
140 | return -4; | |
141 | } | |
142 | ||
143 | /* Call the backend function */ | |
144 | #ifdef HAVE_LIBCURL | |
145 | ret = curl_download_get_url ( hostname, uri, f ); | |
146 | #else | |
147 | ret = http_download_get_url ( hostname, uri, f, 0, sendhostname ); | |
148 | #endif | |
149 | ||
150 | if (ret == -1 || ret == 1 || ret == -2 || check_map_file(f)) | |
151 | { | |
152 | fprintf(stderr, "Download error: %s\n", fn); | |
153 | fclose ( f ); | |
154 | remove ( tmpfilename ); | |
155 | g_free ( tmpfilename ); | |
156 | remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ | |
157 | return -1; | |
158 | } | |
159 | ||
160 | fclose ( f ); | |
161 | rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */ | |
162 | g_free ( tmpfilename ); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | /* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */ | |
167 | /* uri: like "/uri.html?whatever" */ | |
168 | /* only reason for the "wrapper" is so we can do redirects. */ | |
169 | int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn ) | |
170 | { | |
171 | return download ( hostname, uri, fn, 1 ); | |
172 | } | |
173 | ||
174 | int a_http_download_get_url_nohostname ( const char *hostname, const char *uri, const char *fn ) | |
175 | { | |
176 | return download ( hostname, uri, fn, 0 ); | |
177 | } |