-
-
Notifications
You must be signed in to change notification settings - Fork 6.2k
/
libcurl-errors.3
398 lines (397 loc) · 17.6 KB
/
libcurl-errors.3
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" **************************************************************************
.\"
.TH libcurl-errors 3 "23 Nov 2021" "libcurl 7.81.0" "libcurl errors"
.SH NAME
libcurl-errors \- error codes in libcurl
.SH DESCRIPTION
This man page includes most, if not all, available error codes in libcurl.
Why they occur and possibly what you can do to fix the problem are also included.
.SH "CURLcode"
Almost all "easy" interface functions return a CURLcode error code. No matter
what, using the \fIcurl_easy_setopt(3)\fP option \fICURLOPT_ERRORBUFFER(3)\fP
is a good idea as it will give you a human readable error string that may
offer more details about the cause of the error than just the error code.
\fIcurl_easy_strerror(3)\fP can be called to get an error string from a given
CURLcode number.
CURLcode is one of the following:
.IP "CURLE_OK (0)"
All fine. Proceed as usual.
.IP "CURLE_UNSUPPORTED_PROTOCOL (1)"
The URL you passed to libcurl used a protocol that this libcurl does not
support. The support might be a compile-time option that you did not use, it
can be a misspelled protocol string or just a protocol libcurl has no code
for.
.IP "CURLE_FAILED_INIT (2)"
Early initialization code failed. This is likely to be an internal error or
problem, or a resource problem where something fundamental could not get done
at init time.
.IP "CURLE_URL_MALFORMAT (3)"
The URL was not properly formatted.
.IP "CURLE_NOT_BUILT_IN (4)"
A requested feature, protocol or option was not found built-in in this libcurl
due to a build-time decision. This means that a feature or option was not
enabled or explicitly disabled when libcurl was built and in order to get it
to function you have to get a rebuilt libcurl.
.IP "CURLE_COULDNT_RESOLVE_PROXY (5)"
Couldn't resolve proxy. The given proxy host could not be resolved.
.IP "CURLE_COULDNT_RESOLVE_HOST (6)"
Couldn't resolve host. The given remote host was not resolved.
.IP "CURLE_COULDNT_CONNECT (7)"
Failed to connect() to host or proxy.
.IP "CURLE_WEIRD_SERVER_REPLY (8)"
The server sent data libcurl could not parse. This error code was known as as
\fICURLE_FTP_WEIRD_SERVER_REPLY\fP before 7.51.0.
.IP "CURLE_REMOTE_ACCESS_DENIED (9)"
We were denied access to the resource given in the URL. For FTP, this occurs
while trying to change to the remote directory.
.IP "CURLE_FTP_ACCEPT_FAILED (10)"
While waiting for the server to connect back when an active FTP session is
used, an error code was sent over the control connection or similar.
.IP "CURLE_FTP_WEIRD_PASS_REPLY (11)"
After having sent the FTP password to the server, libcurl expects a proper
reply. This error code indicates that an unexpected code was returned.
.IP "CURLE_FTP_ACCEPT_TIMEOUT (12)"
During an active FTP session while waiting for the server to connect, the
\fICURLOPT_ACCEPTTIMEOUT_MS(3)\fP (or the internal default) timeout expired.
.IP "CURLE_FTP_WEIRD_PASV_REPLY (13)"
libcurl failed to get a sensible result back from the server as a response to
either a PASV or a EPSV command. The server is flawed.
.IP "CURLE_FTP_WEIRD_227_FORMAT (14)"
FTP servers return a 227-line as a response to a PASV command. If libcurl
fails to parse that line, this return code is passed back.
.IP "CURLE_FTP_CANT_GET_HOST (15)"
An internal failure to lookup the host used for the new connection.
.IP "CURLE_HTTP2 (16)"
A problem was detected in the HTTP2 framing layer. This is somewhat generic
and can be one out of several problems, see the error buffer for details.
.IP "CURLE_FTP_COULDNT_SET_TYPE (17)"
Received an error when trying to set the transfer mode to binary or ASCII.
.IP "CURLE_PARTIAL_FILE (18)"
A file transfer was shorter or larger than expected. This happens when the
server first reports an expected transfer size, and then delivers data that
does not match the previously given size.
.IP "CURLE_FTP_COULDNT_RETR_FILE (19)"
This was either a weird reply to a 'RETR' command or a zero byte transfer
complete.
.IP "CURLE_QUOTE_ERROR (21)"
When sending custom "QUOTE" commands to the remote server, one of the commands
returned an error code that was 400 or higher (for FTP) or otherwise
indicated unsuccessful completion of the command.
.IP "CURLE_HTTP_RETURNED_ERROR (22)"
This is returned if \fICURLOPT_FAILONERROR(3)\fP is set TRUE and the HTTP
server returns an error code that is >= 400.
.IP "CURLE_WRITE_ERROR (23)"
An error occurred when writing received data to a local file, or an error was
returned to libcurl from a write callback.
.IP "CURLE_UPLOAD_FAILED (25)"
Failed starting the upload. For FTP, the server typically denied the STOR
command. The error buffer usually contains the server's explanation for this.
.IP "CURLE_READ_ERROR (26)"
There was a problem reading a local file or an error returned by the read
callback.
.IP "CURLE_OUT_OF_MEMORY (27)"
A memory allocation request failed. This is serious badness and
things are severely screwed up if this ever occurs.
.IP "CURLE_OPERATION_TIMEDOUT (28)"
Operation timeout. The specified time-out period was reached according to the
conditions.
.IP "CURLE_FTP_PORT_FAILED (30)"
The FTP PORT command returned error. This mostly happens when you have not
specified a good enough address for libcurl to use. See
\fICURLOPT_FTPPORT(3)\fP.
.IP "CURLE_FTP_COULDNT_USE_REST (31)"
The FTP REST command returned error. This should never happen if the server is
sane.
.IP "CURLE_RANGE_ERROR (33)"
The server does not support or accept range requests.
.IP "CURLE_HTTP_POST_ERROR (34)"
This is an odd error that mainly occurs due to internal confusion.
.IP "CURLE_SSL_CONNECT_ERROR (35)"
A problem occurred somewhere in the SSL/TLS handshake. You really want the
error buffer and read the message there as it pinpoints the problem slightly
more. Could be certificates (file formats, paths, permissions), passwords, and
others.
.IP "CURLE_BAD_DOWNLOAD_RESUME (36)"
The download could not be resumed because the specified offset was out of the
file boundary.
.IP "CURLE_FILE_COULDNT_READ_FILE (37)"
A file given with FILE:// could not be opened. Most likely because the file
path does not identify an existing file. Did you check file permissions?
.IP "CURLE_LDAP_CANNOT_BIND (38)"
LDAP cannot bind. LDAP bind operation failed.
.IP "CURLE_LDAP_SEARCH_FAILED (39)"
LDAP search failed.
.IP "CURLE_FUNCTION_NOT_FOUND (41)"
Function not found. A required zlib function was not found.
.IP "CURLE_ABORTED_BY_CALLBACK (42)"
Aborted by callback. A callback returned "abort" to libcurl.
.IP "CURLE_BAD_FUNCTION_ARGUMENT (43)"
A function was called with a bad parameter.
.IP "CURLE_INTERFACE_FAILED (45)"
Interface error. A specified outgoing interface could not be used. Set which
interface to use for outgoing connections' source IP address with
\fICURLOPT_INTERFACE(3)\fP.
.IP "CURLE_TOO_MANY_REDIRECTS (47)"
Too many redirects. When following redirects, libcurl hit the maximum amount.
Set your limit with \fICURLOPT_MAXREDIRS(3)\fP.
.IP "CURLE_UNKNOWN_OPTION (48)"
An option passed to libcurl is not recognized/known. Refer to the appropriate
documentation. This is most likely a problem in the program that uses
libcurl. The error buffer might contain more specific information about which
exact option it concerns.
.IP "CURLE_SETOPT_OPTION_SYNTAX (49)"
An option passed in to a setopt was wrongly formatted. See error message for
details about what option.
.IP "CURLE_GOT_NOTHING (52)"
Nothing was returned from the server, and under the circumstances, getting
nothing is considered an error.
.IP "CURLE_SSL_ENGINE_NOTFOUND (53)"
The specified crypto engine was not found.
.IP "CURLE_SSL_ENGINE_SETFAILED (54)"
Failed setting the selected SSL crypto engine as default.
.IP "CURLE_SEND_ERROR (55)"
Failed sending network data.
.IP "CURLE_RECV_ERROR (56)"
Failure with receiving network data.
.IP "CURLE_SSL_CERTPROBLEM (58)"
problem with the local client certificate.
.IP "CURLE_SSL_CIPHER (59)"
Couldn't use specified cipher.
.IP "CURLE_PEER_FAILED_VERIFICATION (60)"
The remote server's SSL certificate or SSH md5 fingerprint was deemed not OK.
This error code has been unified with CURLE_SSL_CACERT since 7.62.0. Its
previous value was 51.
.IP "CURLE_BAD_CONTENT_ENCODING (61)"
Unrecognized transfer encoding.
.IP "CURLE_LDAP_INVALID_URL (62)"
This error code is deprecated since 7.82.0 and cannot be returned anymore.
.IP "CURLE_FILESIZE_EXCEEDED (63)"
Maximum file size exceeded.
.IP "CURLE_USE_SSL_FAILED (64)"
Requested FTP SSL level failed.
.IP "CURLE_SEND_FAIL_REWIND (65)"
When doing a send operation curl had to rewind the data to retransmit, but the
rewinding operation failed.
.IP "CURLE_SSL_ENGINE_INITFAILED (66)"
Initiating the SSL Engine failed.
.IP "CURLE_LOGIN_DENIED (67)"
The remote server denied curl to login (Added in 7.13.1)
.IP "CURLE_TFTP_NOTFOUND (68)"
File not found on TFTP server.
.IP "CURLE_TFTP_PERM (69)"
Permission problem on TFTP server.
.IP "CURLE_REMOTE_DISK_FULL (70)"
Out of disk space on the server.
.IP "CURLE_TFTP_ILLEGAL (71)"
Illegal TFTP operation.
.IP "CURLE_TFTP_UNKNOWNID (72)"
Unknown TFTP transfer ID.
.IP "CURLE_REMOTE_FILE_EXISTS (73)"
File already exists and will not be overwritten.
.IP "CURLE_TFTP_NOSUCHUSER (74)"
This error should never be returned by a properly functioning TFTP server.
.IP "CURLE_CONV_FAILED (75)"
Character conversion failed.
.IP "CURLE_CONV_REQD (76)"
Caller must register conversion callbacks.
.IP "CURLE_SSL_CACERT_BADFILE (77)"
Problem with reading the SSL CA cert (path? access rights?)
.IP "CURLE_REMOTE_FILE_NOT_FOUND (78)"
The resource referenced in the URL does not exist.
.IP "CURLE_SSH (79)"
An unspecified error occurred during the SSH session.
.IP "CURLE_SSL_SHUTDOWN_FAILED (80)"
Failed to shut down the SSL connection.
.IP "CURLE_AGAIN (81)"
Socket is not ready for send/recv wait till it's ready and try again. This
return code is only returned from \fIcurl_easy_recv(3)\fP and
\fIcurl_easy_send(3)\fP (Added in 7.18.2)
.IP "CURLE_SSL_CRL_BADFILE (82)"
Failed to load CRL file (Added in 7.19.0)
.IP "CURLE_SSL_ISSUER_ERROR (83)"
Issuer check failed (Added in 7.19.0)
.IP "CURLE_FTP_PRET_FAILED (84)"
The FTP server does not understand the PRET command at all or does not support
the given argument. Be careful when using \fICURLOPT_CUSTOMREQUEST(3)\fP, a
custom LIST command will be sent with PRET CMD before PASV as well. (Added in
7.20.0)
.IP "CURLE_RTSP_CSEQ_ERROR (85)"
Mismatch of RTSP CSeq numbers.
.IP "CURLE_RTSP_SESSION_ERROR (86)"
Mismatch of RTSP Session Identifiers.
.IP "CURLE_FTP_BAD_FILE_LIST (87)"
Unable to parse FTP file list (during FTP wildcard downloading).
.IP "CURLE_CHUNK_FAILED (88)"
Chunk callback reported error.
.IP "CURLE_NO_CONNECTION_AVAILABLE (89)"
(For internal use only, will never be returned by libcurl) No connection
available, the session will be queued. (added in 7.30.0)
.IP "CURLE_SSL_PINNEDPUBKEYNOTMATCH (90)"
Failed to match the pinned key specified with \fICURLOPT_PINNEDPUBLICKEY(3)\fP.
.IP "CURLE_SSL_INVALIDCERTSTATUS (91)"
Status returned failure when asked with \fICURLOPT_SSL_VERIFYSTATUS(3)\fP.
.IP "CURLE_HTTP2_STREAM (92)"
Stream error in the HTTP/2 framing layer.
.IP "CURLE_RECURSIVE_API_CALL (93)"
An API function was called from inside a callback.
.IP "CURLE_AUTH_ERROR (94)"
An authentication function returned an error.
.IP "CURLE_HTTP3 (95)"
A problem was detected in the HTTP/3 layer. This is somewhat generic and can
be one out of several problems, see the error buffer for details.
.IP "CURLE_QUIC_CONNECT_ERROR (96)"
QUIC connection error. This error may be caused by an SSL library error. QUIC
is the protocol used for HTTP/3 transfers.
.IP "CURLE_SSL_CLIENTCERT (98)"
SSL Client Certificate required.
.IP "CURLE_UNRECOVERABLE_POLL (99)"
An internal call to poll() or select() returned error that is not recoverable.
.IP "CURLE_OBSOLETE*"
These error codes will never be returned. They were used in an old libcurl
version and are currently unused.
.SH "CURLMcode"
This is the generic return code used by functions in the libcurl multi
interface. Also consider \fIcurl_multi_strerror(3)\fP.
.IP "CURLM_CALL_MULTI_PERFORM (-1)"
This is not really an error. It means you should call
\fIcurl_multi_perform(3)\fP again without doing select() or similar in
between. Before version 7.20.0 (released on February 9 2010) this could be returned by
\fIcurl_multi_perform(3)\fP, but in later versions this return code is never
used.
.IP "CURLM_CALL_MULTI_SOCKET (-1)"
An alias for CURLM_CALL_MULTI_PERFORM. Never returned by modern libcurl
versions.
.IP "CURLM_OK (0)"
Things are fine.
.IP "CURLM_BAD_HANDLE (1)"
The passed-in handle is not a valid CURLM handle.
.IP "CURLM_BAD_EASY_HANDLE (2)"
An easy handle was not good/valid. It could mean that it is not an easy handle
at all, or possibly that the handle already is in use by this or another multi
handle.
.IP "CURLM_OUT_OF_MEMORY (3)"
You are doomed.
.IP "CURLM_INTERNAL_ERROR (4)"
This can only be returned if libcurl bugs. Please report it to us!
.IP "CURLM_BAD_SOCKET (5)"
The passed-in socket is not a valid one that libcurl already knows about.
(Added in 7.15.4)
.IP "CURLM_UNKNOWN_OPTION (6)"
curl_multi_setopt() with unsupported option
(Added in 7.15.4)
.IP "CURLM_ADDED_ALREADY (7)"
An easy handle already added to a multi handle was attempted to get added a
second time. (Added in 7.32.1)
.IP "CURLM_RECURSIVE_API_CALL (8)"
An API function was called from inside a callback.
.IP "CURLM_WAKEUP_FAILURE (9)"
Wakeup is unavailable or failed.
.IP "CURLM_BAD_FUNCTION_ARGUMENT (10)"
A function was called with a bad parameter.
.IP "CURLM_ABORTED_BY_CALLBACK (11)"
A multi handle callback returned error.
.IP "CURLM_UNRECOVERABLE_POLL (12)"
An internal call to poll() or select() returned error that is not recoverable.
.SH "CURLSHcode"
The "share" interface will return a CURLSHcode to indicate when an error has
occurred. Also consider \fIcurl_share_strerror(3)\fP.
.IP "CURLSHE_OK (0)"
All fine. Proceed as usual.
.IP "CURLSHE_BAD_OPTION (1)"
An invalid option was passed to the function.
.IP "CURLSHE_IN_USE (2)"
The share object is currently in use.
.IP "CURLSHE_INVALID (3)"
An invalid share object was passed to the function.
.IP "CURLSHE_NOMEM (4)"
Not enough memory was available.
(Added in 7.12.0)
.IP "CURLSHE_NOT_BUILT_IN (5)"
The requested sharing could not be done because the library you use do not have
that particular feature enabled. (Added in 7.23.0)
.SH "CURLUcode"
The URL interface will return a CURLUcode to indicate when an error has
occurred. Also consider \fIcurl_url_strerror(3)\fP.
.IP "CURLUE_BAD_HANDLE (1)"
An invalid CURLU pointer was passed as argument.
.IP "CURLUE_BAD_PARTPOINTER (2)"
An invalid 'part' argument was passed as argument.
.IP "CURLUE_MALFORMED_INPUT (3)"
A malformed input was passed to a URL API function.
.IP "CURLUE_BAD_PORT_NUMBER (4)"
The port number was not a decimal number between 0 and 65535.
.IP "CURLUE_UNSUPPORTED_SCHEME (5)"
This libcurl build does not support the given URL scheme.
.IP "CURLUE_URLDECODE (6)"
URL decode error, most likely because of rubbish in the input.
.IP "CURLUE_OUT_OF_MEMORY (7)"
A memory function failed.
.IP "CURLUE_USER_NOT_ALLOWED (8)"
Credentials was passed in the URL when prohibited.
.IP "CURLUE_UNKNOWN_PART (9)"
An unknown part ID was passed to a URL API function.
.IP "CURLUE_NO_SCHEME (10)"
There is no scheme part in the URL.
.IP "CURLUE_NO_USER (11)"
There is no user part in the URL.
.IP "CURLUE_NO_PASSWORD (12)"
There is no password part in the URL.
.IP "CURLUE_NO_OPTIONS (13)"
There is no options part in the URL.
.IP "CURLUE_NO_HOST (14)"
There is no host part in the URL.
.IP "CURLUE_NO_PORT (15)"
There is no port part in the URL.
.IP "CURLUE_NO_QUERY (16)"
There is no query part in the URL.
.IP "CURLUE_NO_FRAGMENT (17)"
There is no fragment part in the URL.
.IP "CURLUE_NO_ZONEID (18)"
There is no zoneid set in the URL.
.IP "CURLUE_BAD_FILE_URL (19)"
The file:// URL is invalid.
.IP "CURLUE_BAD_FRAGMENT (20)"
The fragment part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_HOSTNAME (21)"
The hostname contained bad or invalid characters.
.IP "CURLUE_BAD_IPV6 (22)"
The IPv6 address hostname contained bad or invalid characters.
.IP "CURLUE_BAD_LOGIN (23)"
The login part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_PASSWORD (24)"
The password part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_PATH (25)"
The path part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_QUERY (26)"
The query part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_SCHEME (27)"
The scheme part of the URL contained bad or invalid characters.
.IP "CURLUE_BAD_SLASHES (28)"
The URL contained an invalid number of slashes.
.IP "CURLUE_BAD_USER (29)"
The user part of the URL contained bad or invalid characters.
.SH "SEE ALSO"
.BR curl_easy_strerror "(3), " curl_multi_strerror "(3), "
.BR curl_share_strerror "(3), " curl_url_strerror "(3), "
.BR CURLOPT_ERRORBUFFER "(3), " CURLOPT_VERBOSE "(3), "
.BR CURLOPT_DEBUGFUNCTION "(3)"