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bti.c
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bti.c
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/*
* Copyright (C) 2008-2011 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
* Copyright (C) 2009-2010 Amir Mohammad Saied <amirsaied@gmail.com>
*
* 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 version 2 of the License.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <curl/curl.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <pcre.h>
#include <termios.h>
#include <dlfcn.h>
#include <oauth.h>
#include "bti.h"
#define zalloc(size) calloc(size, 1)
#define dbg(format, arg...) \
do { \
if (debug) \
fprintf(stdout, "bti: %s: " format , __func__ , \
## arg); \
} while (0)
int debug;
static void display_help(void)
{
fprintf(stdout, "bti - send tweet to twitter or identi.ca\n"
"Version: %s\n"
"Usage:\n"
" bti [options]\n"
"options are:\n"
" --account accountname\n"
" --password password\n"
" --action action\n"
" ('update', 'friends', 'public', 'replies', or 'user')\n"
" --user screenname\n"
" --group groupname\n"
" --proxy PROXY:PORT\n"
" --host HOST\n"
" --logfile logfile\n"
" --config configfile\n"
" --replyto ID\n"
" --retweet ID\n"
" --shrink-urls\n"
" --page PAGENUMBER\n"
" --column COLUMNWIDTH\n"
" --bash\n"
" --background\n"
" --debug\n"
" --verbose\n"
" --dry-run\n"
" --version\n"
" --help\n", VERSION);
}
static void display_version(void)
{
fprintf(stdout, "bti - version %s\n", VERSION);
}
static char *get_string(const char *name)
{
char *temp;
char *string;
string = zalloc(1000);
if (!string)
exit(1);
if (name != NULL)
fprintf(stdout, "%s", name);
if (!fgets(string, 999, stdin)) {
free(string);
return NULL;
}
temp = strchr(string, '\n');
if (temp)
*temp = '\0';
return string;
}
/*
* Try to get a handle to a readline function from a variety of different
* libraries. If nothing is present on the system, then fall back to an
* internal one.
*
* Logic originally based off of code in the e2fsutils package in the
* lib/ss/get_readline.c file, which is licensed under the MIT license.
*
* This keeps us from having to relicense the bti codebase if readline
* ever changes its license, as there is no link-time dependency.
* It is a run-time thing only, and we handle any readline-like library
* in the same manner, making bti not be a derivative work of any
* other program.
*/
static void session_readline_init(struct session *session)
{
/* Libraries we will try to use for readline/editline functionality */
const char *libpath = "libreadline.so.6:libreadline.so.5:"
"libreadline.so.4:libreadline.so:libedit.so.2:"
"libedit.so:libeditline.so.0:libeditline.so";
void *handle = NULL;
char *tmp, *cp, *next;
int (*bind_key)(int, void *);
void (*insert)(void);
/* default to internal function if we can't or won't find anything */
session->readline = get_string;
if (!isatty(0))
return;
session->interactive = 1;
tmp = malloc(strlen(libpath)+1);
if (!tmp)
return;
strcpy(tmp, libpath);
for (cp = tmp; cp; cp = next) {
next = strchr(cp, ':');
if (next)
*next++ = 0;
if (*cp == 0)
continue;
handle = dlopen(cp, RTLD_NOW);
if (handle) {
dbg("Using %s for readline library\n", cp);
break;
}
}
free(tmp);
if (!handle) {
dbg("No readline library found.\n");
return;
}
session->readline_handle = handle;
session->readline = (char *(*)(const char *))dlsym(handle, "readline");
if (session->readline == NULL) {
/* something odd happened, default back to internal stuff */
session->readline_handle = NULL;
session->readline = get_string;
return;
}
/*
* If we found a library, turn off filename expansion
* as that makes no sense from within bti.
*/
bind_key = (int (*)(int, void *))dlsym(handle, "rl_bind_key");
insert = (void (*)(void))dlsym(handle, "rl_insert");
if (bind_key && insert)
bind_key('\t', insert);
}
static void session_readline_cleanup(struct session *session)
{
if (session->readline_handle)
dlclose(session->readline_handle);
}
static struct session *session_alloc(void)
{
struct session *session;
session = zalloc(sizeof(*session));
if (!session)
return NULL;
return session;
}
static void session_free(struct session *session)
{
if (!session)
return;
free(session->retweet);
free(session->replyto);
free(session->password);
free(session->account);
free(session->consumer_key);
free(session->consumer_secret);
free(session->access_token_key);
free(session->access_token_secret);
free(session->tweet);
free(session->proxy);
free(session->time);
free(session->homedir);
free(session->user);
free(session->group);
free(session->hosturl);
free(session->hostname);
free(session->configfile);
free(session);
}
static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
{
struct bti_curl_buffer *buffer;
buffer = zalloc(sizeof(*buffer));
if (!buffer)
return NULL;
/* start out with a data buffer of 1 byte to
* make the buffer fill logic simpler */
buffer->data = zalloc(1);
if (!buffer->data) {
free(buffer);
return NULL;
}
buffer->length = 0;
buffer->action = action;
return buffer;
}
static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
{
if (!buffer)
return;
free(buffer->data);
free(buffer);
}
const char twitter_host[] = "http://api.twitter.com/1/statuses";
const char identica_host[] = "https://identi.ca/api/statuses";
const char twitter_name[] = "twitter";
const char identica_name[] = "identi.ca";
static const char twitter_request_token_uri[] = "http://twitter.com/oauth/request_token";
static const char twitter_access_token_uri[] = "http://twitter.com/oauth/access_token";
static const char twitter_authorize_uri[] = "http://twitter.com/oauth/authorize?oauth_token=";
static const char identica_request_token_uri[] = "https://identi.ca/api/oauth/request_token?oauth_callback=oob";
static const char identica_access_token_uri[] = "https://identi.ca/api/oauth/access_token";
static const char identica_authorize_uri[] = "https://identi.ca/api/oauth/authorize?oauth_token=";
static const char user_uri[] = "/user_timeline/";
static const char update_uri[] = "/update.xml";
static const char public_uri[] = "/public_timeline.xml";
static const char friends_uri[] = "/friends_timeline.xml";
static const char mentions_uri[] = "/mentions.xml";
static const char replies_uri[] = "/replies.xml";
static const char retweet_uri[] = "/retweet/";
static const char group_uri[] = "/../statusnet/groups/timeline/";
static const char config_default[] = "/etc/bti";
static const char config_user_default[] = ".bti";
static CURL *curl_init(void)
{
CURL *curl;
curl = curl_easy_init();
if (!curl) {
fprintf(stderr, "Can not init CURL!\n");
return NULL;
}
/* some ssl sanity checks on the connection we are making */
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
return curl;
}
/* The final place data is sent to the screen/pty/tty */
static void bti_output_line(struct session *session, xmlChar *user,
xmlChar *id, xmlChar *created, xmlChar *text)
{
if (session->verbose)
printf("[%*s] {%s} (%.16s) %s\n", -session->column_output, user,
id, created, text);
else
printf("[%*s] %s\n", -session->column_output, user, text);
}
static void parse_statuses(struct session *session,
xmlDocPtr doc, xmlNodePtr current)
{
xmlChar *text = NULL;
xmlChar *user = NULL;
xmlChar *created = NULL;
xmlChar *id = NULL;
xmlNodePtr userinfo;
current = current->xmlChildrenNode;
while (current != NULL) {
if (current->type == XML_ELEMENT_NODE) {
if (!xmlStrcmp(current->name, (const xmlChar *)"created_at"))
created = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
if (!xmlStrcmp(current->name, (const xmlChar *)"id"))
id = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
userinfo = current->xmlChildrenNode;
while (userinfo != NULL) {
if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
if (user)
xmlFree(user);
user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
}
userinfo = userinfo->next;
}
}
if (user && text && created && id) {
bti_output_line(session, user, id,
created, text);
xmlFree(user);
xmlFree(text);
xmlFree(created);
xmlFree(id);
user = NULL;
text = NULL;
created = NULL;
id = NULL;
}
}
current = current->next;
}
return;
}
static void parse_timeline(char *document, struct session *session)
{
xmlDocPtr doc;
xmlNodePtr current;
doc = xmlReadMemory(document, strlen(document), "timeline.xml",
NULL, XML_PARSE_NOERROR);
if (doc == NULL)
return;
current = xmlDocGetRootElement(doc);
if (current == NULL) {
fprintf(stderr, "empty document\n");
xmlFreeDoc(doc);
return;
}
if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
fprintf(stderr, "unexpected document type\n");
xmlFreeDoc(doc);
return;
}
current = current->xmlChildrenNode;
while (current != NULL) {
if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
parse_statuses(session, doc, current);
current = current->next;
}
xmlFreeDoc(doc);
return;
}
static size_t curl_callback(void *buffer, size_t size, size_t nmemb,
void *userp)
{
struct bti_curl_buffer *curl_buf = userp;
size_t buffer_size = size * nmemb;
char *temp;
if ((!buffer) || (!buffer_size) || (!curl_buf))
return -EINVAL;
/* add to the data we already have */
temp = zalloc(curl_buf->length + buffer_size + 1);
if (!temp)
return -ENOMEM;
memcpy(temp, curl_buf->data, curl_buf->length);
free(curl_buf->data);
curl_buf->data = temp;
memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
curl_buf->length += buffer_size;
if (curl_buf->action)
parse_timeline(curl_buf->data, curl_buf->session);
dbg("%s\n", curl_buf->data);
return buffer_size;
}
static int parse_osp_reply(const char *reply, char **token, char **secret)
{
int rc;
int retval = 1;
char **rv = NULL;
rc = oauth_split_url_parameters(reply, &rv);
qsort(rv, rc, sizeof(char *), oauth_cmpstringp);
if (rc == 2 || rc == 4) {
if (!strncmp(rv[0], "oauth_token=", 11) &&
!strncmp(rv[1], "oauth_token_secret=", 18)) {
if (token)
*token = strdup(&(rv[0][12]));
if (secret)
*secret = strdup(&(rv[1][19]));
retval = 0;
}
} else if (rc == 3) {
if (!strncmp(rv[1], "oauth_token=", 11) &&
!strncmp(rv[2], "oauth_token_secret=", 18)) {
if (token)
*token = strdup(&(rv[1][12]));
if (secret)
*secret = strdup(&(rv[2][19]));
retval = 0;
}
}
dbg("token: %s\n", *token);
dbg("secret: %s\n", *secret);
if (rv)
free(rv);
return retval;
}
static int request_access_token(struct session *session)
{
char *post_params = NULL;
char *request_url = NULL;
char *reply = NULL;
char *at_key = NULL;
char *at_secret = NULL;
char *verifier = NULL;
char at_uri[90];
if (!session)
return -EINVAL;
if (session->host == HOST_TWITTER)
request_url = oauth_sign_url2(
twitter_request_token_uri, NULL,
OA_HMAC, NULL, session->consumer_key,
session->consumer_secret, NULL, NULL);
else if (session->host == HOST_IDENTICA)
request_url = oauth_sign_url2(
identica_request_token_uri, NULL,
OA_HMAC, NULL, session->consumer_key,
session->consumer_secret, NULL, NULL);
reply = oauth_http_get(request_url, post_params);
if (request_url)
free(request_url);
if (post_params)
free(post_params);
if (!reply)
return 1;
if (parse_osp_reply(reply, &at_key, &at_secret))
return 1;
free(reply);
fprintf(stdout,
"Please open the following link in your browser, and "
"allow 'bti' to access your account. Then paste "
"back the provided PIN in here.\n");
if (session->host == HOST_TWITTER) {
fprintf(stdout, "%s%s\nPIN: ", twitter_authorize_uri, at_key);
verifier = session->readline(NULL);
sprintf(at_uri, "%s?oauth_verifier=%s",
twitter_access_token_uri, verifier);
} else if (session->host == HOST_IDENTICA) {
fprintf(stdout, "%s%s\nPIN: ", identica_authorize_uri, at_key);
verifier = session->readline(NULL);
sprintf(at_uri, "%s?oauth_verifier=%s",
identica_access_token_uri, verifier);
}
request_url = oauth_sign_url2(at_uri, NULL, OA_HMAC, NULL,
session->consumer_key,
session->consumer_secret,
at_key, at_secret);
reply = oauth_http_get(request_url, post_params);
if (!reply)
return 1;
if (parse_osp_reply(reply, &at_key, &at_secret))
return 1;
free(reply);
fprintf(stdout,
"Please put these two lines in your bti "
"configuration file (%s):\n"
"access_token_key=%s\n"
"access_token_secret=%s\n",
session->configfile, at_key, at_secret);
return 0;
}
static int send_request(struct session *session)
{
char endpoint[500];
char user_password[500];
char data[500];
struct bti_curl_buffer *curl_buf;
CURL *curl = NULL;
CURLcode res;
struct curl_httppost *formpost = NULL;
struct curl_httppost *lastptr = NULL;
struct curl_slist *slist = NULL;
char *req_url = NULL;
char *reply = NULL;
char *postarg = NULL;
char *escaped_tweet = NULL;
int is_post = 0;
if (!session)
return -EINVAL;
if (!session->hosturl)
session->hosturl = strdup(twitter_host);
if (session->no_oauth || session->guest) {
curl_buf = bti_curl_buffer_alloc(session->action);
if (!curl_buf)
return -ENOMEM;
curl_buf->session = session;
curl = curl_init();
if (!curl) {
bti_curl_buffer_free(curl_buf);
return -EINVAL;
}
if (!session->hosturl)
session->hosturl = strdup(twitter_host);
switch (session->action) {
case ACTION_UPDATE:
snprintf(user_password, sizeof(user_password), "%s:%s",
session->account, session->password);
snprintf(data, sizeof(data), "status=\"%s\"",
session->tweet);
curl_formadd(&formpost, &lastptr,
CURLFORM_COPYNAME, "status",
CURLFORM_COPYCONTENTS, session->tweet,
CURLFORM_END);
curl_formadd(&formpost, &lastptr,
CURLFORM_COPYNAME, "source",
CURLFORM_COPYCONTENTS, "bti",
CURLFORM_END);
if (session->replyto)
curl_formadd(&formpost, &lastptr,
CURLFORM_COPYNAME,
"in_reply_to_status_id",
CURLFORM_COPYCONTENTS,
session->replyto,
CURLFORM_END);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
slist = curl_slist_append(slist, "Expect:");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
sprintf(endpoint, "%s%s", session->hosturl, update_uri);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
break;
case ACTION_FRIENDS:
snprintf(user_password, sizeof(user_password), "%s:%s",
session->account, session->password);
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
friends_uri, session->page);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
break;
case ACTION_USER:
sprintf(endpoint, "%s%s%s.xml?page=%d", session->hosturl,
user_uri, session->user, session->page);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
break;
case ACTION_REPLIES:
snprintf(user_password, sizeof(user_password), "%s:%s",
session->account, session->password);
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
replies_uri, session->page);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
break;
case ACTION_PUBLIC:
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
public_uri, session->page);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
break;
case ACTION_GROUP:
sprintf(endpoint, "%s%s%s.xml?page=%d",
session->hosturl, group_uri, session->group,
session->page);
curl_easy_setopt(curl, CURLOPT_URL, endpoint);
break;
default:
break;
}
if (session->proxy)
curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
if (debug)
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
dbg("user_password = %s\n", user_password);
dbg("data = %s\n", data);
dbg("proxy = %s\n", session->proxy);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
if (!session->dry_run) {
res = curl_easy_perform(curl);
if (!session->background) {
xmlDocPtr doc;
xmlNodePtr current;
if (res) {
fprintf(stderr, "error(%d) trying to "
"perform operation\n", res);
curl_easy_cleanup(curl);
if (session->action == ACTION_UPDATE)
curl_formfree(formpost);
bti_curl_buffer_free(curl_buf);
return -EINVAL;
}
doc = xmlReadMemory(curl_buf->data,
curl_buf->length,
"response.xml", NULL,
XML_PARSE_NOERROR);
if (doc == NULL) {
curl_easy_cleanup(curl);
if (session->action == ACTION_UPDATE)
curl_formfree(formpost);
bti_curl_buffer_free(curl_buf);
return -EINVAL;
}
current = xmlDocGetRootElement(doc);
if (current == NULL) {
fprintf(stderr, "empty document\n");
xmlFreeDoc(doc);
curl_easy_cleanup(curl);
if (session->action == ACTION_UPDATE)
curl_formfree(formpost);
bti_curl_buffer_free(curl_buf);
return -EINVAL;
}
if (xmlStrcmp(current->name, (const xmlChar *)"status")) {
fprintf(stderr, "unexpected document type\n");
xmlFreeDoc(doc);
curl_easy_cleanup(curl);
if (session->action == ACTION_UPDATE)
curl_formfree(formpost);
bti_curl_buffer_free(curl_buf);
return -EINVAL;
}
xmlFreeDoc(doc);
}
}
curl_easy_cleanup(curl);
if (session->action == ACTION_UPDATE)
curl_formfree(formpost);
bti_curl_buffer_free(curl_buf);
} else {
switch (session->action) {
case ACTION_UPDATE:
escaped_tweet = oauth_url_escape(session->tweet);
if (session->replyto) {
sprintf(endpoint,
"%s%s?status=%s&in_reply_to_status_id=%s",
session->hosturl, update_uri,
escaped_tweet, session->replyto);
} else {
sprintf(endpoint, "%s%s?status=%s",
session->hosturl, update_uri,
escaped_tweet);
}
is_post = 1;
break;
case ACTION_USER:
sprintf(endpoint, "%s%s%s.xml?page=%d",
session->hosturl, user_uri, session->user,
session->page);
break;
case ACTION_REPLIES:
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
mentions_uri, session->page);
break;
case ACTION_PUBLIC:
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
public_uri, session->page);
break;
case ACTION_GROUP:
sprintf(endpoint, "%s%s%s.xml?page=%d",
session->hosturl, group_uri, session->group,
session->page);
break;
case ACTION_FRIENDS:
sprintf(endpoint, "%s%s?page=%d", session->hosturl,
friends_uri, session->page);
break;
case ACTION_RETWEET:
sprintf(endpoint, "%s%s%s.xml", session->hosturl,
retweet_uri, session->retweet);
is_post = 1;
break;
default:
break;
}
dbg("%s\n", endpoint);
if (!session->dry_run) {
if (is_post) {
req_url = oauth_sign_url2(endpoint, &postarg, OA_HMAC,
NULL, session->consumer_key,
session->consumer_secret,
session->access_token_key,
session->access_token_secret);
reply = oauth_http_post(req_url, postarg);
} else {
req_url = oauth_sign_url2(endpoint, NULL, OA_HMAC, NULL,
session->consumer_key,
session->consumer_secret,
session->access_token_key,
session->access_token_secret);
reply = oauth_http_get(req_url, postarg);
}
dbg("%s\n", req_url);
dbg("%s\n", reply);
if (req_url)
free(req_url);
}
if (!reply) {
fprintf(stderr, "Error retrieving from URL (%s)\n", endpoint);
return -EIO;
}
if ((session->action != ACTION_UPDATE) &&
(session->action != ACTION_RETWEET))
parse_timeline(reply, session);
}
return 0;
}
static void log_session(struct session *session, int retval)
{
FILE *log_file;
char *filename;
/* Only log something if we have a log file set */
if (!session->logfile)
return;
filename = alloca(strlen(session->homedir) +
strlen(session->logfile) + 3);
sprintf(filename, "%s/%s", session->homedir, session->logfile);
log_file = fopen(filename, "a+");
if (log_file == NULL)
return;
switch (session->action) {
case ACTION_UPDATE:
if (retval)
fprintf(log_file, "%s: host=%s tweet failed\n",
session->time, session->hostname);
else
fprintf(log_file, "%s: host=%s tweet=%s\n",
session->time, session->hostname,
session->tweet);
break;
case ACTION_FRIENDS:
fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
session->time, session->hostname);
break;
case ACTION_USER:
fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
session->time, session->hostname, session->user);
break;
case ACTION_REPLIES:
fprintf(log_file, "%s: host=%s retrieving replies\n",
session->time, session->hostname);
break;
case ACTION_PUBLIC:
fprintf(log_file, "%s: host=%s retrieving public timeline\n",
session->time, session->hostname);
break;
case ACTION_GROUP:
fprintf(log_file, "%s: host=%s retrieving group timeline\n",
session->time, session->hostname);
break;
default:
break;
}
fclose(log_file);
}
static char *get_string_from_stdin(void)
{
char *temp;
char *string;
string = zalloc(1000);
if (!string)
return NULL;
if (!fgets(string, 999, stdin)) {
free(string);
return NULL;
}
temp = strchr(string, '\n');
if (temp)
*temp = '\0';
return string;
}
static void read_password(char *buf, size_t len, char *host)
{
char pwd[80];
int retval;
struct termios old;
struct termios tp;
tcgetattr(0, &tp);
old = tp;
tp.c_lflag &= (~ECHO);
tcsetattr(0, TCSANOW, &tp);
fprintf(stdout, "Enter password for %s: ", host);
fflush(stdout);
tcflow(0, TCOOFF);
retval = scanf("%79s", pwd);
tcflow(0, TCOON);
fprintf(stdout, "\n");
tcsetattr(0, TCSANOW, &old);
strncpy(buf, pwd, len);
buf[len-1] = '\0';
}
static int find_urls(const char *tweet, int **pranges)
{
/*
* magic obtained from
* http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
*/
static const char *re_magic =
"(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
"[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
"(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
pcre *re;
const char *errptr;
int erroffset;
int ovector[10] = {0,};
const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
int startoffset, tweetlen;
int i, rc;
int rbound = 10;
int rcount = 0;
int *ranges = malloc(sizeof(int) * rbound);
re = pcre_compile(re_magic,
PCRE_NO_AUTO_CAPTURE,
&errptr, &erroffset, NULL);
if (!re) {
fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
exit(1);
}
tweetlen = strlen(tweet);
for (startoffset = 0; startoffset < tweetlen; ) {
rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
ovector, ovsize);
if (rc == PCRE_ERROR_NOMATCH)
break;
if (rc < 0) {
fprintf(stderr, "pcre_exec @%u: %s\n",
erroffset, errptr);
exit(1);
}
for (i = 0; i < rc; i += 2) {
if ((rcount+2) == rbound) {
rbound *= 2;
ranges = realloc(ranges, sizeof(int) * rbound);
}
ranges[rcount++] = ovector[i];
ranges[rcount++] = ovector[i+1];
}
startoffset = ovector[1];
}
pcre_free(re);
*pranges = ranges;
return rcount;
}
/**
* bidirectional popen() call
*
* @param rwepipe - int array of size three
* @param exe - program to run
* @param argv - argument list
* @return pid or -1 on error
*
* The caller passes in an array of three integers (rwepipe), on successful
* execution it can then write to element 0 (stdin of exe), and read from
* element 1 (stdout) and 2 (stderr).
*/
static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
{
int in[2];
int out[2];
int err[2];
int pid;
int rc;
rc = pipe(in);
if (rc < 0)
goto error_in;
rc = pipe(out);
if (rc < 0)
goto error_out;
rc = pipe(err);
if (rc < 0)
goto error_err;
pid = fork();
if (pid > 0) {
/* parent */
close(in[0]);
close(out[1]);
close(err[1]);
rwepipe[0] = in[1];
rwepipe[1] = out[0];
rwepipe[2] = err[0];
return pid;
} else if (pid == 0) {
/* child */