mirror of git://git.gnupg.org/gnupg.git
336 lines
7.0 KiB
C
336 lines
7.0 KiB
C
/* curl-shim.c - Implement a small subset of the curl API in terms of
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* the iobuf HTTP API
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*
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* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include <config.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include "http.h"
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#include "util.h"
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#include "ksutil.h"
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#include "curl-shim.h"
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static CURLcode
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handle_error(CURL *curl,CURLcode err,const char *str)
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{
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if(curl->errorbuffer)
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{
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/* Make sure you never exceed CURL_ERROR_SIZE, currently set to
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256 in curl-shim.h */
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switch(err)
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{
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case CURLE_OK:
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strcpy(curl->errorbuffer,"okay");
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break;
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case CURLE_UNSUPPORTED_PROTOCOL:
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strcpy(curl->errorbuffer,"unsupported protocol");
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break;
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case CURLE_COULDNT_CONNECT:
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strcpy(curl->errorbuffer,"couldn't connect");
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break;
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case CURLE_WRITE_ERROR:
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strcpy(curl->errorbuffer,"write error");
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break;
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case CURLE_HTTP_RETURNED_ERROR:
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sprintf(curl->errorbuffer,"url returned error %u",curl->status);
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break;
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default:
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strcpy(curl->errorbuffer,"generic error");
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break;
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}
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if(str && (strlen(curl->errorbuffer)+2+strlen(str)+1)<=CURL_ERROR_SIZE)
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{
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strcat(curl->errorbuffer,": ");
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strcat(curl->errorbuffer,str);
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}
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}
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return err;
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}
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CURLcode
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curl_global_init(long flags)
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{
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return CURLE_OK;
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}
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void
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curl_global_cleanup(void) {}
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CURL *
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curl_easy_init(void)
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{
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CURL *handle;
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handle=calloc(1,sizeof(CURL));
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if(handle)
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handle->errors=stderr;
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return handle;
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}
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void
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curl_easy_cleanup(CURL *curl)
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{
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if (curl)
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{
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http_close (curl->hd);
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free(curl);
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}
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}
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CURLcode
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curl_easy_setopt(CURL *curl,CURLoption option,...)
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{
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va_list ap;
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va_start(ap,option);
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switch(option)
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{
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case CURLOPT_URL:
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curl->url=va_arg(ap,char *);
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break;
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case CURLOPT_USERPWD:
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curl->auth=va_arg(ap,char *);
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break;
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case CURLOPT_WRITEFUNCTION:
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curl->writer=va_arg(ap,write_func);
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break;
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case CURLOPT_FILE:
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curl->file=va_arg(ap,void *);
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break;
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case CURLOPT_ERRORBUFFER:
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curl->errorbuffer=va_arg(ap,char *);
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break;
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case CURLOPT_PROXY:
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curl->proxy=va_arg(ap,char *);
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break;
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case CURLOPT_POST:
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curl->flags.post=va_arg(ap,unsigned int);
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break;
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case CURLOPT_POSTFIELDS:
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curl->postfields=va_arg(ap,char *);
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break;
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case CURLOPT_FAILONERROR:
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curl->flags.failonerror=va_arg(ap,unsigned int);
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break;
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case CURLOPT_VERBOSE:
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curl->flags.verbose=va_arg(ap,unsigned int);
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break;
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case CURLOPT_STDERR:
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curl->errors=va_arg(ap,FILE *);
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break;
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default:
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/* We ignore the huge majority of curl options */
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break;
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}
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return handle_error(curl,CURLE_OK,NULL);
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}
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CURLcode
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curl_easy_perform(CURL *curl)
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{
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int rc;
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CURLcode err=CURLE_OK;
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const char *errstr=NULL;
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char *proxy=NULL;
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/* Emulate the libcurl proxy behavior. If the calling program set a
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proxy, use it. If it didn't set a proxy or set it to NULL, check
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for one in the environment. If the calling program explicitly
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set a null-string proxy the http code doesn't use a proxy at
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all. */
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if(curl->proxy)
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proxy=curl->proxy;
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else
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proxy=getenv(HTTP_PROXY_ENV);
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if(curl->flags.verbose)
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fprintf(curl->errors,"* HTTP proxy is \"%s\"\n",proxy?proxy:"null");
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if(curl->flags.post)
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{
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rc = http_open (&curl->hd, HTTP_REQ_POST, curl->url, curl->auth,
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0, proxy, NULL);
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if (!rc)
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{
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unsigned int post_len = strlen(curl->postfields);
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es_fprintf (http_get_write_ptr (curl->hd),
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"Content-Type: application/x-www-form-urlencoded\r\n"
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"Content-Length: %u\r\n", post_len);
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http_start_data (curl->hd);
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es_write (http_get_write_ptr (curl->hd),
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curl->postfields, post_len, NULL);
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rc = http_wait_response (curl->hd);
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curl->status = http_get_status_code (curl->hd);
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if (!rc && curl->flags.failonerror && curl->status>=300)
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err = CURLE_HTTP_RETURNED_ERROR;
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http_close(curl->hd);
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curl->hd = NULL;
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}
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}
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else
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{
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rc = http_open (&curl->hd, HTTP_REQ_GET, curl->url, curl->auth,
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0, proxy, NULL);
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if (!rc)
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{
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rc = http_wait_response (curl->hd);
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curl->status = http_get_status_code (curl->hd);
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if (!rc)
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{
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if (curl->flags.failonerror && curl->status>=300)
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err = CURLE_HTTP_RETURNED_ERROR;
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else
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{
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unsigned int maxlen = 1024, buflen, len;
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unsigned char *line = NULL;
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while ((len = es_read_line (http_get_read_ptr (curl->hd),
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&line, &buflen, &maxlen)))
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{
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size_t ret;
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maxlen=1024;
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ret=(curl->writer)(line,len,1,curl->file);
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if(ret!=len)
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{
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err=CURLE_WRITE_ERROR;
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break;
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}
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}
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es_free (line);
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http_close(curl->hd);
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curl->hd = NULL;
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}
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}
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else
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{
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http_close (curl->hd);
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curl->hd = NULL;
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}
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}
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}
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switch(rc)
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{
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case 0:
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break;
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case G10ERR_INVALID_URI:
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err=CURLE_UNSUPPORTED_PROTOCOL;
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break;
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case G10ERR_NETWORK:
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errstr=strerror(errno);
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err=CURLE_COULDNT_CONNECT;
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break;
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default:
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errstr=g10_errstr(rc);
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err=CURLE_COULDNT_CONNECT;
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break;
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}
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return handle_error(curl,err,errstr);
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}
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/* This is not the same exact set that is allowed according to
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RFC-2396, but it is what the real curl uses. */
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#define VALID_URI_CHARS "abcdefghijklmnopqrstuvwxyz" \
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
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"0123456789"
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char *
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curl_escape(char *str,int length)
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{
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int len,max,idx,enc_idx=0;
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char *enc;
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if(length)
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len=length;
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else
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len=strlen(str);
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enc=malloc(len+1);
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if(!enc)
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return enc;
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max=len;
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for(idx=0;idx<len;idx++)
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{
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if(enc_idx+3>max)
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{
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char *tmp;
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max+=100;
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tmp=realloc(enc,max+1);
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if(!tmp)
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{
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free(enc);
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return NULL;
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}
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enc=tmp;
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}
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if(strchr(VALID_URI_CHARS,str[idx]))
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enc[enc_idx++]=str[idx];
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else
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{
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char numbuf[5];
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sprintf(numbuf,"%%%02X",str[idx]);
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strcpy(&enc[enc_idx],numbuf);
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enc_idx+=3;
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}
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}
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enc[enc_idx]='\0';
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return enc;
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}
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void
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curl_free(char *ptr)
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{
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free(ptr);
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}
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