1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 /* <DESC> 23 * Show how CURLOPT_DEBUGFUNCTION can be used. 24 * </DESC> 25 */ 26 #include <stdio.h> 27 #include <curl/curl.h> 28 29 struct data { 30 char trace_ascii; /* 1 or 0 */ 31 }; 32 33 static dump(const char * text,FILE * stream,unsigned char * ptr,size_t size,char nohex)34 void dump(const char *text, 35 FILE *stream, unsigned char *ptr, size_t size, 36 char nohex) 37 { 38 size_t i; 39 size_t c; 40 41 unsigned int width = 0x10; 42 43 if(nohex) 44 /* without the hex output, we can fit more on screen */ 45 width = 0x40; 46 47 fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n", 48 text, (long)size, (long)size); 49 50 for(i = 0; i<size; i += width) { 51 52 fprintf(stream, "%4.4lx: ", (long)i); 53 54 if(!nohex) { 55 /* hex not disabled, show it */ 56 for(c = 0; c < width; c++) 57 if(i + c < size) 58 fprintf(stream, "%02x ", ptr[i + c]); 59 else 60 fputs(" ", stream); 61 } 62 63 for(c = 0; (c < width) && (i + c < size); c++) { 64 /* check for 0D0A; if found, skip past and start a new line of output */ 65 if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D && 66 ptr[i + c + 1] == 0x0A) { 67 i += (c + 2 - width); 68 break; 69 } 70 fprintf(stream, "%c", 71 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.'); 72 /* check again for 0D0A, to avoid an extra \n if it's at width */ 73 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D && 74 ptr[i + c + 2] == 0x0A) { 75 i += (c + 3 - width); 76 break; 77 } 78 } 79 fputc('\n', stream); /* newline */ 80 } 81 fflush(stream); 82 } 83 84 static my_trace(CURL * handle,curl_infotype type,char * data,size_t size,void * userp)85 int my_trace(CURL *handle, curl_infotype type, 86 char *data, size_t size, 87 void *userp) 88 { 89 struct data *config = (struct data *)userp; 90 const char *text; 91 (void)handle; /* prevent compiler warning */ 92 93 switch(type) { 94 case CURLINFO_TEXT: 95 fprintf(stderr, "== Info: %s", data); 96 /* FALLTHROUGH */ 97 default: /* in case a new one is introduced to shock us */ 98 return 0; 99 100 case CURLINFO_HEADER_OUT: 101 text = "=> Send header"; 102 break; 103 case CURLINFO_DATA_OUT: 104 text = "=> Send data"; 105 break; 106 case CURLINFO_SSL_DATA_OUT: 107 text = "=> Send SSL data"; 108 break; 109 case CURLINFO_HEADER_IN: 110 text = "<= Recv header"; 111 break; 112 case CURLINFO_DATA_IN: 113 text = "<= Recv data"; 114 break; 115 case CURLINFO_SSL_DATA_IN: 116 text = "<= Recv SSL data"; 117 break; 118 } 119 120 dump(text, stderr, (unsigned char *)data, size, config->trace_ascii); 121 return 0; 122 } 123 main(void)124 int main(void) 125 { 126 CURL *curl; 127 CURLcode res; 128 struct data config; 129 130 config.trace_ascii = 1; /* enable ascii tracing */ 131 132 curl = curl_easy_init(); 133 if(curl) { 134 curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace); 135 curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &config); 136 137 /* the DEBUGFUNCTION has no effect until we enable VERBOSE */ 138 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 139 140 /* example.com is redirected, so we tell libcurl to follow redirection */ 141 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); 142 143 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/"); 144 res = curl_easy_perform(curl); 145 /* Check for errors */ 146 if(res != CURLE_OK) 147 fprintf(stderr, "curl_easy_perform() failed: %s\n", 148 curl_easy_strerror(res)); 149 150 /* always cleanup */ 151 curl_easy_cleanup(curl); 152 } 153 return 0; 154 } 155