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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/*! \file
Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
2015, 2016, 2017, 2018
University Corporation for Atmospheric Research/Unidata.
See \ref copyright file for more info.
*/
#ifndef NCTESTSERVER_H
#define NCTESTSERVER_H 1
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include "netcdf.h"
#undef FINDTESTSERVER_DEBUG
enum KIND {NOKIND, DAP2KIND, DAP4KIND, THREDDSKIND};
#define MAXSERVERURL 4096
#define TIMEOUT 10 /*seconds*/
#define BUFSIZE 8192 /*bytes*/
#define MAXREMOTETESTSERVERS 4096
#ifndef HAVE_CURLINFO_RESPONSE_CODE
#define CURLINFO_RESPONSE_CODE CURLINFO_HTTP_CODE
#endif
static int ping(const char* url);
static int timedping(const char* url, long timeout);
static char**
parseServers(const char* remotetestservers)
{
char* rts;
char** servers = NULL;
char** list = NULL;
char* p;
char* svc;
char** l;
size_t rtslen = strlen(remotetestservers);
/* Keep LGTM quiet */
if(rtslen > MAXREMOTETESTSERVERS) goto done;
list = (char**)malloc(sizeof(char*) * (int)(rtslen/2));
if(list == NULL) return NULL;
rts = strdup(remotetestservers);
if(rts == NULL) goto done;
l = list;
p = rts;
for(;;) {
svc = p;
p = strchr(svc,',');
if(p != NULL) *p = '\0';
*l++ = strdup(svc);
if(p == NULL) break;
p++;
}
*l = NULL;
servers = list;
list = NULL;
done:
if(rts) free(rts);
if(list) free(list);
return servers;
}
/**
Given a partial suffix path and a specified
protocol, test if a request to any of the test
servers + path returns some kind of result.
This indicates that the server is up and running.
Return the complete url for the server plus the path.
*/
char*
nc_findtestserver(const char* path, const char* serverlist)
{
char** svclist;
char** svc;
char url[MAXSERVERURL];
char* match = NULL;
int reportsearch;
if((svclist = parseServers(serverlist))==NULL) {
fprintf(stderr,"cannot parse test server list: %s\n",serverlist);
return NULL;
}
reportsearch = (getenv("NC_REPORTSEARCH") != NULL);
for(svc=svclist;*svc;svc++) {
if(strlen(*svc) == 0)
goto done;
if(path == NULL) path = "";
if(strlen(path) > 0 && path[0] == '/')
path++;
if(reportsearch)
fprintf(stderr,"nc_findtestserver: candidate=%s/%s: found=",*svc,path);
/* Try https: first */
snprintf(url,MAXSERVERURL,"https://%s/%s",*svc,path);
if(ping(url) == NC_NOERR) {
if(reportsearch) fprintf(stderr,"yes\n");
match = strdup(url);
goto done;
}
/* Try http: next */
snprintf(url,MAXSERVERURL,"http://%s/%s",*svc,path);
if(ping(url) == NC_NOERR) {
if(reportsearch) fprintf(stderr,"yes\n");
match = strdup(url);
goto done;
}
if(reportsearch) fprintf(stderr,"no\n");
}
done:
if(reportsearch) fflush(stderr);
/* Free up the envv list of servers */
if(svclist != NULL) {
char** p;
for(p=svclist;*p;p++)
free(*p);
free(svclist);
}
return match;
}
#define CERR(expr) if((cstat=(expr)) != CURLE_OK) goto done;
struct Buffer {
char data[BUFSIZE];
size_t offset; /* into buffer */
};
static size_t
WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
struct Buffer* buffer = (struct Buffer*)data;
size_t total = size * nmemb;
size_t canwrite = total; /* assume so */
if(total == 0) {
fprintf(stderr,"WriteMemoryCallback: zero sized chunk\n");
goto done;
}
if((buffer->offset + total) > sizeof(buffer->data))
canwrite = (sizeof(buffer->data) - buffer->offset); /* partial read */
if(canwrite > 0)
memcpy(&(buffer->data[buffer->offset]),ptr,canwrite);
buffer->offset += canwrite;
done:
return total; /* pretend we captured everything */
}
/*
See if a server is responding.
Return NC_ECURL if the ping fails, NC_NOERR otherwise
*/
static int
ping(const char* url)
{
return timedping(url,TIMEOUT);
}
static int
timedping(const char* url, long timeout)
{
int stat = NC_NOERR;
CURLcode cstat = CURLE_OK;
CURL* curl = NULL;
long http_code = 0;
struct Buffer data;
/* Create a CURL instance */
curl = curl_easy_init();
if (curl == NULL) {cstat = CURLE_OUT_OF_MEMORY; goto done;}
CERR((curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1)));
/* Use redirects */
CERR((curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10L)));
CERR((curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L)));
/* use very short timeouts: 10 seconds */
CERR((curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, (long)timeout)));
CERR((curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)timeout)));
/* fail on HTTP 400 code errors */
CERR((curl_easy_setopt(curl, CURLOPT_FAILONERROR, (long)1)));
/* Set the URL */
CERR((curl_easy_setopt(curl, CURLOPT_URL, (void*)url)));
/* send all data to this function */
CERR((curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback)));
/* we pass our file to the callback function */
CERR((curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&data)));
data.offset = 0;
memset(data.data,0,sizeof(data.data));
CERR((curl_easy_perform(curl)));
/* Don't trust curl to return an error when request gets 404 */
CERR((curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE, &http_code)));
if(http_code >= 400) {
cstat = CURLE_HTTP_RETURNED_ERROR;
goto done;
}
done:
if(cstat != CURLE_OK) {
#ifdef FINDTESTSERVER_DEBUG
fprintf(stderr, "curl error: %s; url=%s\n",
curl_easy_strerror(cstat),url);
#endif
stat = NC_ECURL;
}
if (curl != NULL)
curl_easy_cleanup(curl);
return stat;
}
#endif /*NCTESTSERVER_H*/
|
