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libcarddav/src/carddav-utils.c

734 lines
18 KiB

/* Copyright (c) 2010 Timothy Pearson (kb9vqf@pearsoncomputing.net)
* Copyright (c) 2008 Michael Rasmussen (mir@datanom.net)
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "carddav-utils.h"
#include "md5.h"
#include <glib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <curl/curl.h>
#include <ctype.h>
/**
* This function is burrowed from the libcurl documentation
* @param text
* @param stream
* @param ptr
* @param size
* @param nohex
*/
void dump(const char* text, FILE* stream, char* ptr, size_t size, char nohex) {
size_t i;
size_t c;
unsigned int width=0x10;
if(nohex)
/* without the hex output, we can fit more on screen */
width = 0x40;
fprintf(stream, "%s, %zd bytes (0x%zx)\n", text, size, size);
for(i=0; i<size; i+= width) {
fprintf(stream, "%04zx: ", i);
if(!nohex) {
/* hex not disabled, show it */
for(c = 0; c < width; c++) {
if(i+c < size)
fprintf(stream, "%02x ", ptr[i+c]);
else
fputs(" ", stream);
}
}
for(c = 0; (c < width) && (i+c < size); c++) {
/* check for 0D0A; if found, skip past and start a new line of output */
if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
i+=(c+2-width);
break;
}
fprintf(stream, "%c",(ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
/* check again for 0D0A, to avoid an extra \n if it's at width */
if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
i+=(c+3-width);
break;
}
}
fputc('\n', stream); /* newline */
}
fflush(stream);
}
/**
* This function is burrowed from the libcurl documentation
* @param handle
* @param type
* @param data
* @param size
* @param userp
* @return
*/
int my_trace(CURL* handle, curl_infotype type, char* data, size_t size, void* userp) {
struct config_data* config = (struct config_data *)userp;
const char* text;
(void)handle; /* prevent compiler warning */
switch (type) {
case CURLINFO_TEXT:
fprintf(stderr, "== Info: %s", data);
default: /* in case a new one is introduced to shock us */
return 0;
case CURLINFO_HEADER_OUT:
text = "=> Send header";
break;
case CURLINFO_DATA_OUT:
text = "=> Send data";
break;
case CURLINFO_SSL_DATA_OUT:
text = "=> Send SSL data";
break;
case CURLINFO_HEADER_IN:
text = "<= Recv header";
break;
case CURLINFO_DATA_IN:
text = "<= Recv data";
break;
case CURLINFO_SSL_DATA_IN:
text = "<= Recv SSL data";
break;
}
dump(text, stderr, data, size, config->trace_ascii);
return 0;
}
/**
* This function is burrowed from the libcurl documentation
* @param ptr
* @param size
* @return void* to memory region
*/
static void* myrealloc(void* ptr, size_t size) {
/* There might be a realloc() out there that doesn't like reallocing
* NULL pointers, so we take care of it here
* */
if(ptr)
return realloc(ptr, size);
else
return malloc(size);
}
/**
* This function is burrowed from the libcurl documentation
* @param ptr
* @param size
* @param nmemb
* @param data
* @return number of written bytes
*/
size_t WriteMemoryCallback(void* ptr, size_t size, size_t nmemb, void* data) {
size_t realsize = size * nmemb;
struct MemoryStruct* mem = (struct MemoryStruct *)data;
mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
if (mem->memory) {
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
}
return realsize;
}
/**
* This function is burrowed from the libcurl documentation
* @param ptr
* @param size
* @param nmemb
* @param data
* @return number of written bytes
*/
size_t WriteHeaderCallback(void* ptr, size_t size, size_t nmemb, void* data) {
size_t realsize = size * nmemb;
struct MemoryStruct* mem = (struct MemoryStruct *)data;
mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
if (mem->memory) {
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
}
return realsize;
}
/*
size_t ReadMemoryCallback(void* ptr, size_t size, size_t nmemb, void* data){
struct MemoryStruct* mem = (struct MemoryStruct *)data;
memcpy(ptr, mem->memory, mem->size);
return mem->size;
}
*/
/**
* Initialize carddav settings structure.
* @param settings @see carddav_settings
*/
void init_carddav_settings(carddav_settings* settings) {
settings->username = NULL;
settings->password = NULL;
settings->url = NULL;
settings->file = NULL;
settings->usehttps = FALSE;
settings->custom_cacert = NULL;
settings->verify_ssl_certificate = TRUE;
settings->debug = FALSE;
settings->trace_ascii = TRUE;
settings->ACTION = UNKNOWN;
settings->start = 0;
settings->end = 0;
}
/**
* Free memory assigned to carddav settings structure.
* @param settings @see carddav_settings
*/
void free_carddav_settings(carddav_settings* settings) {
if (settings->username) {
g_free(settings->username);
settings->username = NULL;
}
if (settings->password) {
g_free(settings->password);
settings->password = NULL;
}
if (settings->url) {
g_free(settings->url);
settings->url = NULL;
}
if (settings->file) {
g_free(settings->file);
settings->file = NULL;
}
if (settings->custom_cacert) {
g_free(settings->custom_cacert);
settings->custom_cacert = NULL;
}
settings->verify_ssl_certificate = TRUE;
settings->usehttps = FALSE;
settings->debug = FALSE;
settings->trace_ascii = TRUE;
settings->ACTION = UNKNOWN;
settings->start = 0;
settings->end = 0;
}
static gchar* place_after_hostname(const gchar* start, const gchar* stop) {
gchar* newpos = NULL;
gchar* pos = (gchar *) stop;
gboolean digit = TRUE;
if (pos && stop && strcmp(start, pos) != 0) {
while (*pos != ':' && strcmp(start, pos) != 0)
--pos;
if (pos > start) {
gchar* tmp = (gchar *) pos + 1;
/* is pos++ a port number */
while (*tmp != '/' && digit) {
if (isdigit(*tmp) != 0) {
digit = TRUE;
tmp++;
}
else
digit = FALSE;
}
if (digit) {
/* pos was a port number */
while (*pos != '@' && strcmp(start, pos) != 0)
--pos;
if (strcmp(start, pos) != 0)
newpos = pos;
}
else {
while (*pos != '@' && pos != stop)
pos++;
if (pos != stop)
newpos = pos;
}
}
else {
/* is a username present */
gchar* tmp = NULL;
while (*pos != '/' && pos != stop) {
if (*pos == '@')
tmp = pos;
pos++;
}
if (tmp && pos != stop)
newpos = tmp;
}
}
return newpos;
}
/**
* Parse URL
* @param settings @see carddav_settings
* @param url String containing URL to collection
*/
void parse_url(carddav_settings* settings, const char* url) {
char* start;
char* pos;
char* end;
char* login;
login = pos = end = start = NULL;
if (!url)
return;
if ((pos = strstr(url, "//")) != NULL) {
/* Does the URL use https ?*/
if (!g_ascii_strncasecmp(url,"https",5) && settings->usehttps == FALSE) {
settings->usehttps=TRUE;
}
start = g_strdup(&(*(pos + 2)));
if ((pos = place_after_hostname(start, strrchr(start, '\0') - 1)) != NULL) {
/* username and/or password present */
login = g_strndup(start, pos - start);
end = pos;
if ((pos = strrchr(login, ':')) != NULL) {
/* both username and password is present */
settings->username = g_strndup(login, pos - login);
settings->password = g_strdup(++pos);
}
else {
/* only username present */
settings->username = g_strdup(login);
settings->password = NULL;
}
g_free(login);
settings->url = g_strdup(++end);
}
else {
/* no username or password present */
settings->url = g_strdup(start);
settings->username = NULL;
settings->password = NULL;
}
g_free(start);
}
}
/**
* Find a specific HTTP header from last request
* @param header HTTP header to search for
* @param headers String of HTTP headers from last request
* @param lowcase Should string be returned in all lower case.
* @return The header found or NULL
*/
#define MAX_TOKENS 2
gchar* get_response_header(
const char* header, gchar* headers, gboolean lowcase) {
gchar* line;
gchar* head = NULL;
gchar* oldhead = NULL;
gchar** buf;
gchar* header_list;
gchar* saveptr;
header_list = g_strdup(headers);
line = strtok_r(header_list, "\r\n", &saveptr);
if (line != NULL) {
do {
buf = g_strsplit(line, ":", MAX_TOKENS);
if (buf[1] != NULL) {
if (g_ascii_strcasecmp(buf[0], header) == 0) {
if (head) {
oldhead = head;
head = g_strconcat(head, buf[1], NULL);
g_free(oldhead);
}
else
head = g_strdup(buf[1]);
if (head)
g_strstrip(head);
}
}
g_strfreev(buf);
} while ((line = strtok_r(NULL, "\r\n", &saveptr)) != NULL);
}
g_free(header_list);
if (head)
return (lowcase) ? g_ascii_strdown(head, -1) : head;
else
return NULL;
}
// static const char* VCAL_HEAD =
// "BEGIN:VCALENDAR\r\n"
// "PRODID:-//CardDAV Calendar//NONSGML libcarddav//EN\r\n"
// "VERSION:2.0\r\n";
// static const char* VCAL_FOOT = "END:VCALENDAR";
static const char* VCAL_HEAD = "";
static const char* VCAL_FOOT = "";
/**
* Parse response from CardDAV server. Internal function.
* @param report Response from server
* @param element XML element to find
* @param type VCalendar element to find
* @param wrap Is this the final parsing or just a part
* @param recursive Stop after first match or not
* @return the parsed result
*/
static gchar* parse_carddav_report_wrap(
char* report, const char* element, const char* type,
gboolean wrap, gboolean recursive) {
char* pos;
char* start;
char* object;
char* tmp_report;
char* tmp;
gchar* response;
gchar* begin_type;
gchar* end_type;
gboolean keep_going = TRUE;
begin_type = g_strdup_printf("BEGIN:%s", type);
end_type = g_strdup_printf("END:%s", type);
pos = start = object = response = NULL;
tmp_report = g_strdup(report);
while ((pos = strstr(tmp_report, element)) != NULL && keep_going) {
gchar* url = NULL;
url = get_url(tmp_report);
if (!url) {
url = g_strdup_printf("none");
}
pos = strchr(pos, '>');
if (!pos) {
break;
}
pos = &(*(pos + 1));
pos = strstr(pos, begin_type);
if (!pos) {
break;
}
object = &(*(pos + strlen(begin_type)));
object = g_strchug(object);
start = g_strdup(object);
if ((pos = strstr(start, end_type)) == NULL) {
g_free(start);
break;
}
object = g_strndup(start, strlen(start) - strlen(pos));
if (response) {
tmp = g_strdup(response);
g_free(response);
response = g_strdup_printf("%s%s\r\n%sURI:%s\r\n%s\r\n",
tmp, begin_type, object, url, end_type);
g_free(tmp);
}
else {
if (wrap)
response = g_strdup_printf("%s%s\r\n%sURI:%s\r\n%s\r\n",
VCAL_HEAD, begin_type, object, url, end_type);
else
response = g_strdup_printf("%s\r\n%sURI:%s\r\n%s\r\n",
begin_type, object, url, end_type);
}
if (url) {
g_free(url);
}
if (recursive) {
pos = strchr(pos, '>');
g_free(tmp_report);
tmp_report = g_strdup(&(*(pos + 1)));
}
else {
keep_going = FALSE;
}
g_free(start);
g_free(object);
}
g_free(tmp_report);
g_free(begin_type);
g_free(end_type);
if (wrap)
if (response) {
object = g_strdup(response);
g_free(response);
response = g_strdup_printf("%s%s", object, VCAL_FOOT);
g_free(object);
}
return response;
}
/**
* Parse response from CardDAV server
* @param report Response from server
* @param element XML element to find
* @param type VCalendar element to find
* @return the parsed result
*/
gchar* parse_carddav_report(char* report, const char* element, const char* type) {
gchar* response = NULL;
gchar* timezone = NULL;
gchar* temp = NULL;
if (!report || !element || !type)
return NULL;
/* test for VTIMEZONE.
* Only the first found will be used and this will then
* be the time zone for the entire report
*/
timezone = parse_carddav_report_wrap(
report, element, "VTIMEZONE", FALSE, FALSE);
if (timezone) {
response = g_strdup_printf("%s%s", VCAL_HEAD, timezone);
g_free(timezone);
temp = parse_carddav_report_wrap(report, element, type, FALSE, TRUE);
if (temp) {
gchar* tmp = g_strdup(response);
g_free(response);
response = g_strdup_printf("%s%s%s", tmp, temp, VCAL_FOOT);
g_free(tmp);
g_free(temp);
}
else {
g_free(response);
return NULL;
}
}
else {
temp = parse_carddav_report_wrap(report, element, type, FALSE, TRUE);
if (temp) {
g_free(response);
response = g_strdup_printf("%s%s%s", VCAL_HEAD, temp, VCAL_FOOT);
g_free(temp);
}
else {
g_free(response);
return NULL;
}
}
return response;
}
/**
* Convert a time_t variable to CardDAV DateTime
* @param time a specific date and time
* @return the CardDAV DateTime
*/
gchar* get_carddav_datetime(time_t* time) {
struct tm *current;
gchar* datetime;
current = localtime(time);
datetime = g_strdup_printf("%d%.2d%.2dT%.2d%.2d%.2dZ",
current->tm_year + 1900, current->tm_mon + 1, current->tm_mday,
current->tm_hour, current->tm_min, current->tm_sec);
return datetime;
}
/**
* Create a random text string, using MD5. @see carddav_md5_hex_digest()
* @param text some text to randomize
* @return MD5 hash of text
*/
gchar* random_file_name(gchar* text) {
unsigned char* name;
gchar md5sum[33];
name = (unsigned char *) g_strdup(text);
carddav_md5_hex_digest(md5sum, name);
g_free(name);
return g_strdup(md5sum);
}
/**
* Does the event contain a UID element or not. If not add it.
* @param object A specific event
* @return event, eventually added UID
*/
gchar* verify_uid(gchar* object) {
gchar* uid;
gchar* newobj;
gchar* pos;
newobj = g_strdup(object);
uid = get_response_header("uid", object, TRUE);
if (!uid) {
object = g_strdup(newobj);
g_free(newobj);
pos = strstr(object, "END:VEVENT");
newobj = g_strndup(object, strlen(object) - strlen(pos));
newobj = g_strchomp(newobj);
uid = random_file_name(object);
gchar*tmp = g_strdup(newobj);
g_free(newobj);
newobj = g_strdup_printf("%s\r\nUID:libcarddav-%s@tempuri.org\r\n%s",
tmp, uid, pos);
g_free(uid);
g_free(tmp);
g_free(object);
}
else
g_free(uid);
/*uid = g_strdup(newobj);
g_free(newobj);*/
g_strchomp(newobj);
/*g_free(uid);*/
return newobj;
}
/**
* Fetch a URL from a XML element
* @param text String
* @return URL
*/
#define ELEM_HREF "href>"
gchar* get_url(gchar* text) {
gchar* pos;
gchar* url = NULL;
if ((pos = strstr(text, ELEM_HREF)) == NULL)
return url;
pos = &(*(pos + strlen(ELEM_HREF)));
url = g_strndup(pos, strlen(pos) - strlen(strchr(pos, '<')));
return url;
}
/**
* Fetch any element from XML
* @param text String
* @param tag The element to look for
* @return element
*/
gchar* get_tag(const gchar* tag, gchar* text) {
gchar *pos;
gchar* res = NULL;
gchar* the_tag = NULL;
/*printf("%s\n", text);*/
the_tag = g_strdup_printf("<%s>", tag);
if ((pos = strstr(text, the_tag)) == NULL) {
g_free(the_tag);
return res;
}
pos = &(*(pos + strlen(the_tag)));
res = g_strndup(pos, strlen(pos) - strlen(strchr(pos, '<')));
g_free(the_tag);
return res;
}
/**
* Fetch the etag element from XML
* @param text String
* @return etag
*/
#define ELEM_ETAG "getetag"
gchar* get_etag(gchar* text) {
gchar* etag = NULL;
etag = get_tag(ELEM_ETAG, text);
/* Maybe namespace prefixed */
if (!etag) {
etag = get_tag("D:getetag", text);
}
return etag;
}
/**
* Fetch host from URL
* @param url URL
* @return host
*/
gchar* get_host(gchar* url) {
gchar** buf;
gchar* result = NULL;
buf = g_strsplit(url, "/", 2);
if (buf[0]) {
result = g_strdup(buf[0]);
}
g_strfreev(buf);
return result;
}
/**
* rebuild a raw URL with https if needed from the settings
* @param settings carddav_settings
* @param uri URI to use instead of base
* @return URL
*/
gchar* rebuild_url(carddav_settings* settings, gchar* uri){
gchar* url = NULL;
gchar* mystr = NULL;
if (settings->usehttps) {
mystr = "https://";
} else {
mystr = "http://";
}
if (uri)
url = g_strdup_printf("%s%s", mystr, uri);
else
url = g_strdup_printf("%s%s", mystr,settings->url);
return url;
}
/**
* Prepare a curl connection
* @param settings carddav_settings
* @return CURL
*/
CURL* get_curl(carddav_settings* setting) {
CURL* curl;
gchar* userpwd = NULL;
gchar* url = NULL;
curl = curl_easy_init();
if (curl) {
if (setting->username) {
if (setting->password)
userpwd = g_strdup_printf("%s:%s",
setting->username, setting->password);
else
userpwd = g_strdup_printf("%s", setting->username);
curl_easy_setopt(curl, CURLOPT_USERPWD, userpwd);
g_free(userpwd);
}
if (setting->verify_ssl_certificate)
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2);
else {
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
}
if (setting->custom_cacert)
curl_easy_setopt(curl, CURLOPT_CAINFO, setting->custom_cacert);
curl_easy_setopt(curl, CURLOPT_USERAGENT, __CARDDAV_USERAGENT);
url = rebuild_url(setting, NULL);
curl_easy_setopt(curl, CURLOPT_URL, url);
g_free(url);
}
return (curl) ? curl : NULL;
}