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https.cpp
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#include "https.h"
struct http_response* handle_redirect_get(struct http_response* hresp, char* custom_headers)
{
if(hresp->status_code_int > 300 && hresp->status_code_int < 399)
{
char *token = strtok(hresp->response_headers, "\r\n");
while(token != NULL)
{
if(str_contains(token, "Location:"))
{
/* Extract url */
char *location = str_replace("Location: ", "", token);
return http_get(location, custom_headers);
}
token = strtok(NULL, "\r\n");
}
}
else
{
/* We're not dealing with a redirect, just return the same structure */
return hresp;
}
}
/*
Handles redirect if needed for head requests
*/
struct http_response* handle_redirect_head(struct http_response* hresp, char* custom_headers)
{
if(hresp->status_code_int > 300 && hresp->status_code_int < 399)
{
char *token = strtok(hresp->response_headers, "\r\n");
while(token != NULL)
{
if(str_contains(token, "Location:"))
{
/* Extract url */
char *location = str_replace("Location: ", "", token);
return http_head(location, custom_headers);
}
token = strtok(NULL, "\r\n");
}
}
else
{
/* We're not dealing with a redirect, just return the same structure */
return hresp;
}
}
/*
Handles redirect if needed for post requests
*/
struct http_response* handle_redirect_post(struct http_response* hresp, char* custom_headers, char *post_data)
{
if(hresp->status_code_int > 300 && hresp->status_code_int < 399)
{
char *token = strtok(hresp->response_headers, "\r\n");
while(token != NULL)
{
if(str_contains(token, "Location:"))
{
/* Extract url */
char *location = str_replace("Location: ", "", token);
return http_post(location, custom_headers, post_data);
}
token = strtok(NULL, "\r\n");
}
}
else
{
/* We're not dealing with a redirect, just return the same structure */
return hresp;
}
}
/*
Makes a HTTP request and returns the response
*/
struct http_response* http_req(char *http_headers, struct parsed_url *purl)
{
/* Parse url */
if(purl == NULL)
{
printf("Unable to parse url");
return NULL;
}
/* Declare variable */
int sock;
int tmpres;
char buf[BUFSIZ+1];
struct sockaddr_in remote;
/* Allocate memeory for htmlcontent */
struct http_response *hresp = (struct http_response*)malloc(sizeof(struct http_response));
if(hresp == NULL)
{
printf("Unable to allocate memory for htmlcontent.");
return NULL;
}
hresp->body = NULL;
hresp->request_headers = NULL;
hresp->response_headers = NULL;
hresp->status_code = NULL;
hresp->status_text = NULL;
/* Create TCP socket */
if((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
printf("Can't create TCP socket");
free(hresp);
return NULL;
}
/* Set remote->sin_addr.s_addr */
remote.sin_family = AF_INET;
#if WIN32
remote.sin_addr.s_addr= inet_addr(purl->ip);
#else
tmpres = inet_pton(AF_INET, purl->ip, (void *)(&(remote.sin_addr.s_addr)));
if( tmpres < 0)
{
printf("Can't set remote->sin_addr.s_addr");
free(hresp);
return NULL;
}
else if(tmpres == 0)
{
printf("Not a valid IP");
free(hresp);
return NULL;
}
#endif // WIN32
remote.sin_port = htons(atoi(purl->port));
/* Connect */
if(connect(sock, (struct sockaddr *)&remote, sizeof(struct sockaddr)) < 0)
{
printf("Could not connect");
free(hresp);
return NULL;
}
ssl_info *sslinfo;
if ( strcmp(purl->scheme,"https")==0)
{
sslinfo=(ssl_info*)malloc(sizeof(ssl_info));
if(ssl_init_info(&sock,sslinfo)==-1)
{
ssl_free_info(sslinfo);
free(sslinfo);
free(hresp);
return NULL;
}
}
/* Send headers to server */
int sent = 0;
while(sent < strlen(http_headers))
{
if ( strcmp(purl->scheme,"https")==0)
{
tmpres = ssl_write(&sslinfo->ssl, (unsigned char*)http_headers+sent, strlen(http_headers)-sent);
}
else
{
tmpres = send(sock, http_headers+sent, strlen(http_headers)-sent, 0);
}
if(tmpres == -1)
{
printf("Can't send headers");
if ( strcmp(purl->scheme,"https")==0)
{
ssl_free_info(sslinfo);
free(sslinfo);
}
free(hresp);
return NULL;
}
sent += tmpres;
}
/* Recieve into response*/
char *response = (char*)malloc(0);
char BUF[BUFSIZ];
int recived_len = 0;
if ( strcmp(purl->scheme,"https")==0)
{
while((recived_len = ssl_read(&sslinfo->ssl, (unsigned char *)BUF, BUFSIZ-1)) > 0)
{
BUF[recived_len] = '\0';
response = (char*)realloc(response, strlen(response) + recived_len + 1);
// sprintf(response, "%s%s", response, BUF);
memcpy(response+strlen(response),BUF,recived_len+1);
}
}
else
{
while((recived_len = recv(sock, BUF, BUFSIZ-1, 0)) > 0)
{
BUF[recived_len] = '\0';
response = (char*)realloc(response, strlen(response) + recived_len + 1);
// sprintf(response, "%s%s", response, BUF);
memcpy(response+strlen(response),BUF,recived_len+1);
}
}
//POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY remote close notify
if (recived_len < 0&&recived_len!=POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
{
free(http_headers);
#ifdef _WIN32
closesocket(sock);
#else
close(sock);
#endif
if(strcmp(purl->scheme,"https")==0)
{
ssl_free_info(sslinfo);
free(sslinfo);
}
free(response);
free(hresp);
return NULL;
}
/* Reallocate response */
response = (char*)realloc(response, strlen(response) + 1);
/* Close socket */
#ifdef _WIN32
closesocket(sock);
#else
close(sock);
#endif
/* Parse status code and text */
char *status_line = get_until(response, "\r\n");
status_line = str_replace("HTTP/1.1 ", "", status_line);
char *status_code = str_ndup(status_line, 4);
status_code = str_replace(" ", "", status_code);
char *status_text = str_replace(status_code, "", status_line);
status_text = str_replace(" ", "", status_text);
hresp->status_code = status_code;
hresp->status_code_int = atoi(status_code);
hresp->status_text = status_text;
/* Parse response headers */
char *headers = get_until(response, "\r\n\r\n");
hresp->response_headers = headers;
/* Assign request headers */
hresp->request_headers = http_headers;
/* Assign request url */
hresp->request_uri = purl;
int responselen=strlen(response);
int bodystart=strpos(response,"\r\n\r\n",0);
char *body;
if(bodystart+4>=responselen||bodystart<1)
{
body="";
}
else
{
body=response+bodystart+4;
}
//old
//char *body = strstr(response, "\r\n\r\n");
//body = str_replace("\r\n\r\n", "", body);
hresp->body = body;
/* Return response */
if (strcmp(purl->scheme,"https")==0)
{
ssl_free_info(sslinfo);
free(sslinfo);
}
return hresp;
}
/*
Makes a HTTP GET request to the given url
*/
struct http_response* http_get(char *url, char *custom_headers)
{
/* Parse url */
struct parsed_url *purl = parse_url(url);
if(purl == NULL)
{
printf("Unable to parse url");
return NULL;
}
/* Declare variable */
char *http_headers = (char*)malloc(1024);
/* Build query/headers */
if(purl->path != NULL)
{
if(purl->query != NULL)
{
sprintf(http_headers, "GET /%s?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->query, purl->host);
}
else
{
sprintf(http_headers, "GET /%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->host);
}
}
else
{
if(purl->query != NULL)
{
sprintf(http_headers, "GET /?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->query, purl->host);
}
else
{
sprintf(http_headers, "GET / HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->host);
}
}
/* Handle authorisation if needed */
if(purl->username != NULL)
{
/* Format username:password pair */
char *upwd = (char*)malloc(1024);
sprintf(upwd, "%s:%s", purl->username, purl->password);
upwd = (char*)realloc(upwd, strlen(upwd) + 1);
/* Base64 encode */
char *base64 = base64_encode(upwd);
/* Form header */
char *auth_header = (char*)malloc(1024);
sprintf(auth_header, "Authorization: Basic %s\r\n", base64);
auth_header = (char*)realloc(auth_header, strlen(auth_header) + 1);
/* Add to header */
http_headers = (char*)realloc(http_headers, strlen(http_headers) + strlen(auth_header) + 2);
sprintf(http_headers, "%s%s", http_headers, auth_header);
}
/* Add custom headers, and close */
if(custom_headers != NULL)
{
sprintf(http_headers, "%s%s\r\n", http_headers, custom_headers);
}
else
{
sprintf(http_headers, "%s\r\n", http_headers);
}
http_headers = (char*)realloc(http_headers, strlen(http_headers) + 1);
/* Make request and return response */
struct http_response *hresp = http_req(http_headers, purl);
if(hresp!=NULL)
{
return handle_redirect_get(hresp, custom_headers);
}
/* Handle redirect */
return NULL;
}
/*
Makes a HTTP POST request to the given url
*/
struct http_response* http_post(char *url, char *custom_headers, char *post_data)
{
/* Parse url */
struct parsed_url *purl = parse_url(url);
if(purl == NULL)
{
printf("Unable to parse url");
return NULL;
}
/* Declare variable */
char *http_headers = (char*)malloc(1024);
/* Build query/headers */
if(purl->path != NULL)
{
if(purl->query != NULL)
{
sprintf(http_headers, "POST /%s?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\nContent-Length:%d\r\nContent-Type:application/x-www-form-urlencoded\r\n", purl->path, purl->query, purl->host, strlen(post_data));
}
else
{
sprintf(http_headers, "POST /%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\nContent-Length:%d\r\nContent-Type:application/x-www-form-urlencoded\r\n", purl->path, purl->host, strlen(post_data));
}
}
else
{
if(purl->query != NULL)
{
sprintf(http_headers, "POST /?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\nContent-Length:%d\r\nContent-Type:application/x-www-form-urlencoded\r\n", purl->query, purl->host, strlen(post_data));
}
else
{
sprintf(http_headers, "POST / HTTP/1.1\r\nHost:%s\r\nConnection:close\r\nContent-Length:%d\r\nContent-Type:application/x-www-form-urlencoded\r\n", purl->host, strlen(post_data));
}
}
/* Handle authorisation if needed */
if(purl->username != NULL)
{
/* Format username:password pair */
char *upwd = (char*)malloc(1024);
sprintf(upwd, "%s:%s", purl->username, purl->password);
upwd = (char*)realloc(upwd, strlen(upwd) + 1);
/* Base64 encode */
char *base64 = base64_encode(upwd);
/* Form header */
char *auth_header = (char*)malloc(1024);
sprintf(auth_header, "Authorization: Basic %s\r\n", base64);
auth_header = (char*)realloc(auth_header, strlen(auth_header) + 1);
/* Add to header */
http_headers = (char*)realloc(http_headers, strlen(http_headers) + strlen(auth_header) + 2);
sprintf(http_headers, "%s%s", http_headers, auth_header);
}
if(custom_headers != NULL)
{
sprintf(http_headers, "%s%s\r\n", http_headers, custom_headers);
sprintf(http_headers, "%s\r\n%s", http_headers, post_data);
}
else
{
sprintf(http_headers, "%s\r\n%s", http_headers, post_data);
}
http_headers = (char*)realloc(http_headers, strlen(http_headers) + 1);
/* Make request and return response */
struct http_response *hresp = http_req(http_headers, purl);
// printf("post_data:%s\r\n",post_data);
if(hresp==NULL)
{
return NULL;
}
/* Handle redirect */
return handle_redirect_post(hresp, custom_headers, post_data);
}
/*
Makes a HTTP HEAD request to the given url
*/
struct http_response* http_head(char *url, char *custom_headers)
{
/* Parse url */
struct parsed_url *purl = parse_url(url);
if(purl == NULL)
{
printf("Unable to parse url");
return NULL;
}
/* Declare variable */
char *http_headers = (char*)malloc(1024);
/* Build query/headers */
if(purl->path != NULL)
{
if(purl->query != NULL)
{
sprintf(http_headers, "HEAD /%s?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->query, purl->host);
}
else
{
sprintf(http_headers, "HEAD /%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->host);
}
}
else
{
if(purl->query != NULL)
{
sprintf(http_headers, "HEAD/?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->query, purl->host);
}
else
{
sprintf(http_headers, "HEAD / HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->host);
}
}
/* Handle authorisation if needed */
if(purl->username != NULL)
{
/* Format username:password pair */
char *upwd = (char*)malloc(1024);
sprintf(upwd, "%s:%s", purl->username, purl->password);
upwd = (char*)realloc(upwd, strlen(upwd) + 1);
/* Base64 encode */
char *base64 = base64_encode(upwd);
/* Form header */
char *auth_header = (char*)malloc(1024);
sprintf(auth_header, "Authorization: Basic %s\r\n", base64);
auth_header = (char*)realloc(auth_header, strlen(auth_header) + 1);
/* Add to header */
http_headers = (char*)realloc(http_headers, strlen(http_headers) + strlen(auth_header) + 2);
sprintf(http_headers, "%s%s", http_headers, auth_header);
}
if(custom_headers != NULL)
{
sprintf(http_headers, "%s%s\r\n", http_headers, custom_headers);
}
else
{
sprintf(http_headers, "%s\r\n", http_headers);
}
http_headers = (char*)realloc(http_headers, strlen(http_headers) + 1);
/* Make request and return response */
struct http_response *hresp = http_req(http_headers, purl);
/* Handle redirect */
return handle_redirect_head(hresp, custom_headers);
}
/*
Do HTTP OPTIONs requests
*/
struct http_response* http_options(char *url)
{
/* Parse url */
struct parsed_url *purl = parse_url(url);
if(purl == NULL)
{
printf("Unable to parse url");
return NULL;
}
/* Declare variable */
char *http_headers = (char*)malloc(1024);
/* Build query/headers */
if(purl->path != NULL)
{
if(purl->query != NULL)
{
sprintf(http_headers, "OPTIONS /%s?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->query, purl->host);
}
else
{
sprintf(http_headers, "OPTIONS /%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->path, purl->host);
}
}
else
{
if(purl->query != NULL)
{
sprintf(http_headers, "OPTIONS/?%s HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->query, purl->host);
}
else
{
sprintf(http_headers, "OPTIONS / HTTP/1.1\r\nHost:%s\r\nConnection:close\r\n", purl->host);
}
}
/* Handle authorisation if needed */
if(purl->username != NULL)
{
/* Format username:password pair */
char *upwd = (char*)malloc(1024);
sprintf(upwd, "%s:%s", purl->username, purl->password);
upwd = (char*)realloc(upwd, strlen(upwd) + 1);
/* Base64 encode */
char *base64 = base64_encode(upwd);
/* Form header */
char *auth_header = (char*)malloc(1024);
sprintf(auth_header, "Authorization: Basic %s\r\n", base64);
auth_header = (char*)realloc(auth_header, strlen(auth_header) + 1);
/* Add to header */
http_headers = (char*)realloc(http_headers, strlen(http_headers) + strlen(auth_header) + 2);
sprintf(http_headers, "%s%s", http_headers, auth_header);
}
/* Build headers */
sprintf(http_headers, "%s\r\n", http_headers);
http_headers = (char*)realloc(http_headers, strlen(http_headers) + 1);
/* Make request and return response */
struct http_response *hresp = http_req(http_headers, purl);
/* Handle redirect */
return hresp;
}
/*
Free memory of http_response
*/
void http_response_free(struct http_response *hresp)
{
if(hresp != NULL)
{
if(hresp->request_uri != NULL) parsed_url_free(hresp->request_uri);
if(hresp->body != NULL) free(hresp->body);
if(hresp->status_code != NULL) free(hresp->status_code);
if(hresp->status_text != NULL) free(hresp->status_text);
if(hresp->request_headers != NULL) free(hresp->request_headers);
if(hresp->response_headers != NULL) free(hresp->response_headers);
free(hresp);
}
}
/*
Gets the offset of one string in another string
*/
int str_index_of(const char *a, char *b)
{
char *offset = (char*)strstr(a, b);
return offset - a;
}
/*
Checks if one string contains another string
*/
int str_contains(const char *haystack, const char *needle)
{
char *pos = (char*)strstr(haystack, needle);
if(pos)
return 1;
else
return 0;
}
/*
Removes last character from string
*/
char* trim_end(char *string, char to_trim)
{
char last_char = string[strlen(string) -1];
if(last_char == to_trim)
{
char *new_string = string;
new_string[strlen(string) - 1] = 0;
return new_string;
}
else
{
return string;
}
}
/*
Concecates two strings, a wrapper for strcat from string.h, handles the resizing and copying
*/
char* str_cat(char *a, char *b)
{
char *target = (char*)malloc(strlen(a) + strlen(b) + 1);
strcpy(target, a);
strcat(target, b);
return target;
}
/*
Converts an integer value to its hex character
*/
char to_hex(char code)
{
static char hex[] = "0123456789abcdef";
return hex[code & 15];
}
/*
URL encodes a string
*/
char *urlencode(char *str)
{
char *pstr = str, *buf = (char*)malloc(strlen(str) * 3 + 1), *pbuf = buf;
while (*pstr)
{
if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')
*pbuf++ = *pstr;
else if (*pstr == ' ')
*pbuf++ = '+';
else
*pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15);
pstr++;
}
*pbuf = '\0';
return buf;
}
/*
Replacement for the string.h strndup, fixes a bug
*/
char *str_ndup (const char *str, size_t max)
{
size_t len = strnlen(str, max);
char *res = (char*)malloc (len + 1);
if (res)
{
memcpy (res, str, len);
res[len] = '\0';
}
return res;
}
/*
Replacement for the string.h strdup, fixes a bug
*/
char *str_dup(const char *src)
{
char *tmp = (char*)malloc(strlen(src) + 1);
if(tmp)
strcpy(tmp, src);
return tmp;
}
/*
Search and replace a string with another string , in a string
*/
char *str_replace(char *search , char *replace , char *subject)
{
char *p = NULL , *old = NULL , *new_subject = NULL ;
int c = 0 , search_size;
search_size = strlen(search);
for(p = strstr(subject , search) ; p != NULL ; p = strstr(p + search_size , search))
{
c++;
}
c = ( strlen(replace) - search_size )*c + strlen(subject);
new_subject = (char*)malloc( c );
strcpy(new_subject , "");
old = subject;
for(p = strstr(subject , search) ; p != NULL ; p = strstr(p + search_size , search))
{
strncpy(new_subject + strlen(new_subject) , old , p - old);
strcpy(new_subject + strlen(new_subject) , replace);
old = p + search_size;
}
strcpy(new_subject + strlen(new_subject) , old);
return new_subject;
}
/*
Get's all characters until '*until' has been found
*/
char* get_until(char *haystack, char *until)
{
int offset = str_index_of(haystack, until);
return str_ndup(haystack, offset);
}
/* decodeblock - decode 4 '6-bit' characters into 3 8-bit binary bytes */
void decodeblock(unsigned char in[], char *clrstr)
{
unsigned char out[4];
out[0] = in[0] << 2 | in[1] >> 4;
out[1] = in[1] << 4 | in[2] >> 2;
out[2] = in[2] << 6 | in[3] >> 0;
out[3] = '\0';
strncat((char *)clrstr, (char *)out, sizeof(out));
}
/*
Decodes a Base64 string
*/
char* base64_decode(char *b64src)
{
char *clrdst = (char*)malloc( ((strlen(b64src) - 1) / 3 ) * 4 + 4 + 50);
char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int c, phase, i;
unsigned char in[4];
char *p;
clrdst[0] = '\0';
phase = 0; i=0;
while(b64src[i])
{
c = (int) b64src[i];
if(c == '=')
{
decodeblock(in, clrdst);
break;
}
p = strchr(b64, c);
if(p)
{
in[phase] = p - b64;
phase = (phase + 1) % 4;
if(phase == 0)
{
decodeblock(in, clrdst);
in[0]=in[1]=in[2]=in[3]=0;
}
}
i++;
}
clrdst = (char*)realloc(clrdst, strlen(clrdst) + 1);
return clrdst;
}
/* encodeblock - encode 3 8-bit binary bytes as 4 '6-bit' characters */
void encodeblock( unsigned char in[], char b64str[], int len )
{
char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned char out[5];
out[0] = b64[ in[0] >> 2 ];
out[1] = b64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
out[2] = (unsigned char) (len > 1 ? b64[ ((in[1] & 0x0f) << 2) |
((in[2] & 0xc0) >> 6) ] : '=');
out[3] = (unsigned char) (len > 2 ? b64[ in[2] & 0x3f ] : '=');
out[4] = '\0';
strncat((char *)b64str, (char *)out, sizeof(out));
}
/*
Encodes a string with Base64
*/
char* base64_encode(char *clrstr)
{
char *b64dst = (char*)malloc(strlen(clrstr) + 50);
char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned char in[3];
int i, len = 0;
int j = 0;
b64dst[0] = '\0';
while(clrstr[j])
{
len = 0;
for(i=0; i<3; i++)
{
in[i] = (unsigned char) clrstr[j];
if(clrstr[j])
{
len++; j++;
}
else in[i] = 0;
}
if( len )
{
encodeblock( in, b64dst, len );
}
}
b64dst = (char*)realloc(b64dst, strlen(b64dst) + 1);
return b64dst;
}
/*
http-client-c
Copyright (C) 2012-2013 Swen Kooij
This file is part of http-client-c.
http-client-c is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
http-client-c is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with http-client-c. If not, see <http://www.gnu.org/licenses/>.
Warning:
This library does not tend to work that stable nor does it fully implent the
standards described by IETF. For more information on the precise implentation of the
Hyper Text Transfer Protocol:
http://www.ietf.org/rfc/rfc2616.txt
*/
/*
Free memory of parsed url
*/
void parsed_url_free(struct parsed_url *purl)
{
if ( NULL != purl )
{
if ( NULL != purl->scheme ) free(purl->scheme);
if ( NULL != purl->host ) free(purl->host);
if ( NULL != purl->port ) free(purl->port);
if ( NULL != purl->path ) free(purl->path);
if ( NULL != purl->query ) free(purl->query);
if ( NULL != purl->fragment ) free(purl->fragment);
if ( NULL != purl->username ) free(purl->username);
if ( NULL != purl->password ) free(purl->password);
free(purl);
}
}
/*
Retrieves the IP adress of a hostname
*/
char* hostname_to_ip(char *hostname)
{
char *ip = "0.0.0.0";
struct hostent *h;
if ((h=gethostbyname(hostname)) == NULL)
{
printf("gethostbyname");
return NULL;
}
return inet_ntoa(*((struct in_addr *)h->h_addr));
}
/*
Check whether the character is permitted in scheme string
*/
int is_scheme_char(int c)
{
return (!isalpha(c) && '+' != c && '-' != c && '.' != c) ? 0 : 1;
}
/*
Parses a specified URL and returns the structure named 'parsed_url'
Implented according to:
RFC 1738 - http://www.ietf.org/rfc/rfc1738.txt
RFC 3986 - http://www.ietf.org/rfc/rfc3986.txt
*/
struct parsed_url *parse_url(const char *url)
{
/* Define variable */
struct parsed_url *purl;
const char *tmpstr;
const char *curstr;
int len;
int i;
int userpass_flag;
int bracket_flag;
/* Allocate the parsed url storage */
purl = (struct parsed_url*)malloc(sizeof(struct parsed_url));
if ( NULL == purl )
{
return NULL;
}
purl->scheme = NULL;
purl->host = NULL;
purl->port = NULL;
purl->path = NULL;
purl->query = NULL;
purl->fragment = NULL;
purl->username = NULL;
purl->password = NULL;
curstr = url;
/*
* <scheme>:<scheme-specific-part>
* <scheme> := [a-z\+\-\.]+
* upper case = lower case for resiliency
*/
/* Read scheme */
tmpstr = strchr(curstr, ':');
if ( NULL == tmpstr )
{
parsed_url_free(purl); fprintf(stderr, "Error on line %d (%s)\n", __LINE__, __FILE__);
return NULL;
}
/* Get the scheme length */
len = tmpstr - curstr;
/* Check restrictions */
for ( i = 0; i < len; i++ )
{
if (is_scheme_char(curstr[i]) == 0)
{
/* Invalid format */
parsed_url_free(purl); fprintf(stderr, "Error on line %d (%s)\n", __LINE__, __FILE__);
return NULL;
}
}
/* Copy the scheme to the storage */
purl->scheme = (char*)malloc(sizeof(char) * (len + 1));
if ( NULL == purl->scheme )
{