owntone-server/src/webserver.c

/*
 * $id: webserver.c,v 1.39 2005/11/15 06:43:31 rpedde Exp $
 * Webserver library
 *
 * Copyright (C) 2003 Ron Pedde (ron@pedde.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; either version 2 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 <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pthread.h>
#include <regex.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#ifndef WIN32
# include <sys/param.h>
# include <sys/types.h>
# include <sys/socket.h>
#endif

#include "err.h"
#include "restart.h"
#include "webserver.h"

#ifndef WIN32  /* FIXME: the uici stuff should be moved into os-win32 and os-unix
                * as os_opensocket, os_accept, etc */
# include "uici.h"
#endif

/*
 * Defines
 */

#define MAX_HOSTNAME 256
#define MAX_LINEBUFFER 2048

/*
 * Local (private) typedefs
 */

typedef struct tag_ws_handler {
    regex_t regex;
    void (*req_handler)(WS_CONNINFO*);
    int(*auth_handler)(WS_CONNINFO*, char *, char *);
    int addheaders;
    struct tag_ws_handler *next;
} WS_HANDLER;

typedef struct tag_ws_connlist {
    WS_CONNINFO *pwsc;
    struct tag_ws_connlist *next;
} WS_CONNLIST;

typedef struct tag_ws_private {
    WSCONFIG wsconfig;
    WS_HANDLER handlers;
    WS_CONNLIST connlist;
    int server_fd;
    int stop;
    int running;
    int threadno;
    int dispatch_threads;
    pthread_t server_tid;
    pthread_cond_t exit_cond;
    pthread_mutex_t exit_mutex;
} WS_PRIVATE;


/*
 * Forwards
 */
void *ws_mainthread(void*);
void *ws_dispatcher(void*);
int ws_lock_unsafe(void);
int ws_unlock_unsafe(void);
void ws_defaulthandler(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc);
int ws_addarg(ARGLIST *root, char *key, char *fmt, ...);
void ws_freearglist(ARGLIST *root);
char *ws_urldecode(char *string, int space_as_plus);
int ws_getheaders(WS_CONNINFO *pwsc);
int ws_getpostvars(WS_CONNINFO *pwsc);
int ws_getgetvars(WS_CONNINFO *pwsc, char *string);
char *ws_getarg(ARGLIST *root, char *key);
int ws_testarg(ARGLIST *root, char *key, char *value);
int ws_findhandler(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc, 
                   void(**preq)(WS_CONNINFO*),
                   int(**pauth)(WS_CONNINFO*, char *, char *),
                   int *addheaders);
int ws_registerhandler(WSHANDLE ws, char *regex, 
                       void(*handler)(WS_CONNINFO*),
                       int(*auth)(WS_CONNINFO*, char *, char *),
                       int addheaders);
int ws_decodepassword(char *header, char **username, char **password);
int ws_testrequestheader(WS_CONNINFO *pwsc, char *header, char *value);
char *ws_getrequestheader(WS_CONNINFO *pwsc, char *header);
static void ws_add_dispatch_thread(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc);
static void ws_remove_dispatch_thread(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc);
static int ws_encoding_hack(WS_CONNINFO *pwsc);

/*
 * Globals
 */
pthread_mutex_t ws_unsafe=PTHREAD_MUTEX_INITIALIZER;

char *ws_dow[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
char *ws_moy[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
                   "Aug", "Sep", "Oct", "Nov", "Dec" };

/*
 * ws_lock_unsafe
 *
 * Lock non-thread-safe functions
 *
 * returns 0 on success,
 * returns -1 on failure, with errno set
 */
int ws_lock_unsafe(void) {
    int err;
    int retval=0;

    DPRINTF(E_SPAM,L_WS,"Entering ws_lock_unsafe\n");

    if((err=pthread_mutex_lock(&ws_unsafe))) {
        errno=err;
        retval=-1;
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_lock_unsafe with retval of %d\n",retval);
    return retval;
}

/*
 * ws_unlock_unsafe
 *
 * Lock non-thread-safe functions
 *
 * returns 0 on success,
 * returns -1 on failure, with errno set
 */
int ws_unlock_unsafe(void) {
    int err;
    int retval=0;

    DPRINTF(E_SPAM,L_WS,"Entering ws_unlock_unsafe\n");

    if((err=pthread_mutex_unlock(&ws_unsafe))) {
        errno=err;
        retval=-1;
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_unlock_unsafe with a retval of %d\n",retval);
    return retval;
}

/** 
 * lock the connection list
 */
void ws_lock_connlist(WS_PRIVATE *pwsp) {
    if(pthread_mutex_lock(&pwsp->exit_mutex))
        DPRINTF(E_FATAL,L_WS,"Cannot lock condition mutex\n");
}

void ws_unlock_connlist(WS_PRIVATE *pwsp) {
    pthread_mutex_unlock(&pwsp->exit_mutex);
}


/*
 * ws_start
 *
 * Start the main webserver thread.  Should really
 * bind and listen to the port before spawning the thread,
 * since it will be hard to detect and return the error unless
 * we listen first
 *
 * RETURNS
 *   Success: WSHANDLE
 *   Failure: NULL, with errno set
 *
 */
WSHANDLE ws_start(WSCONFIG *config) {
    int err;
    WS_PRIVATE *pwsp;

    DPRINTF(E_SPAM,L_WS,"Entering ws_start\n");
    
    if((pwsp=(WS_PRIVATE*)malloc(sizeof(WS_PRIVATE))) == NULL) {
        DPRINTF(E_SPAM,L_WS,"Malloc error: %s\n",strerror(errno));
        return NULL;
    }

    memcpy(&pwsp->wsconfig,config,sizeof(WS_PRIVATE));
    pwsp->connlist.next=NULL;
    pwsp->running=0;
    pwsp->threadno=0;
    pwsp->stop=0;
    pwsp->dispatch_threads=0;
    pwsp->handlers.next=NULL;

    if((err=pthread_cond_init(&pwsp->exit_cond, NULL))) {
        errno=err;
        DPRINTF(E_LOG,L_WS,"Error in pthread_cond_init: %s\n",strerror(errno));
        return NULL;
    }

    if((err=pthread_mutex_init(&pwsp->exit_mutex,NULL))) {
        errno=err;
        DPRINTF(E_LOG,L_WS,"Error in pthread_mutex_init: %s\n",strerror(errno));
        return NULL;
    }

    DPRINTF(E_INF,L_WS,"Preparing to listen on port %d\n",pwsp->wsconfig.port);

    if((pwsp->server_fd = u_open(pwsp->wsconfig.port)) == -1) {
        err=errno;
        DPRINTF(E_LOG,L_WS,"Could not open port: %s\n",strerror(errno));
        errno=err;
        return NULL;
    }

    DPRINTF(E_INF,L_WS,"Starting server thread\n");
    if((err=pthread_create(&pwsp->server_tid,NULL,ws_mainthread,(void*)pwsp))) {
        DPRINTF(E_LOG,L_WS,"Could not spawn thread: %s\n",strerror(err));
        r_close(pwsp->server_fd);
        errno=err;
        return NULL;
    }
    
    /* we're really running */
    pwsp->running=1;

    DPRINTF(E_SPAM,L_WS,"Exiting ws_start\n");
    return (WSHANDLE)pwsp;
}


/*
 * ws_remove_dispatch_thread
 * 
 * remove a dispatch thread from the thread list
 */
void ws_remove_dispatch_thread(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc) {
    WS_CONNLIST *pHead, *pTail;

    DPRINTF(E_SPAM,L_WS,"Entering ws_remove_dispatch_thread\n");

    ws_lock_connlist(pwsp);

    pTail=&(pwsp->connlist);
    pHead=pwsp->connlist.next;

    while((pHead) && (pHead->pwsc != pwsc)) {
        pTail=pHead;
        pHead=pHead->next;
    }

    if(pHead) {
        pwsp->dispatch_threads--;
        DPRINTF(E_DBG,L_WS,"With thread %d exiting, %d are still running\n",
                pwsc->threadno,pwsp->dispatch_threads);

        pTail->next = pHead->next;
        
        free(pHead);

        /* signal condition in case something is waiting */
        pthread_cond_signal(&pwsp->exit_cond);
    }

    ws_unlock_connlist(pwsp);
    DPRINTF(E_SPAM,L_WS,"Exiting ws_remote_dispatch_thread\n");
}


/*
 * ws_add_dispatch_thread
 *
 * Add a thread to the dispatch thread list
 */
void ws_add_dispatch_thread(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc) {
    WS_CONNLIST *pNew;

    DPRINTF(E_SPAM,L_WS,"Entering ws_add_dispatch_thread\n");

    pNew=(WS_CONNLIST*)malloc(sizeof(WS_CONNLIST));
    pNew->next=NULL;
    pNew->pwsc=pwsc;

    if(!pNew)
        DPRINTF(E_FATAL,L_WS,"Malloc: %s\n",strerror(errno));
    
    ws_lock_connlist(pwsp);

    /* list is locked... */
    pwsp->dispatch_threads++;
    pNew->next = pwsp->connlist.next;
    pwsp->connlist.next = pNew;

    ws_unlock_connlist(pwsp);
    DPRINTF(E_SPAM,L_WS,"Exiting ws_add_dispatch_thread\n");
}

/*
 * ws_stop
 *
 * Stop the web server and all the child threads
 */
extern int ws_stop(WSHANDLE ws) {
    WS_PRIVATE *pwsp = (WS_PRIVATE*)ws;
    WS_HANDLER *current;
    WS_CONNLIST *pcl;
    void *result;

    DPRINTF(E_DBG,L_WS,"Entering ws_stop: %d threads\n",pwsp->dispatch_threads);

    /* free the ws_handlers */
    while(pwsp->handlers.next) {
        current=pwsp->handlers.next;
        pwsp->handlers.next=current->next;
        regfree(&current->regex);
        free(current);
    }

    pwsp->stop=1;
    pwsp->running=0;

    DPRINTF(E_DBG,L_WS,"ws_stop: closing the server fd\n");
    shutdown(pwsp->server_fd,SHUT_RDWR);
    r_close(pwsp->server_fd);
    
    /* wait for the server thread to terminate.  SHould be quick! */
    pthread_join(pwsp->server_tid,&result);

    /* Give the threads an extra push */
    ws_lock_connlist(pwsp);

    pcl=pwsp->connlist.next;

    /* Closing the client sockets out from under the dispatch threads
     * should cause the dispatch threads to exit out with an error.
     */
    while(pcl) {
        if(pcl->pwsc->fd) {
            shutdown(pcl->pwsc->fd,SHUT_RDWR);
            r_close(pcl->pwsc->fd);
        } 
        pcl=pcl->next;
    }

    /* wait for the threads to be done */
    while(pwsp->dispatch_threads) {
        DPRINTF(E_DBG,L_WS,"ws_stop: I still see %d threads\n",pwsp->dispatch_threads);
        pthread_cond_wait(&pwsp->exit_cond, &pwsp->exit_mutex);
    }

    ws_unlock_connlist(pwsp);

    free(pwsp);

    DPRINTF(E_SPAM,L_WS,"Exiting ws_stop\n");
    return 0;
}

/*
 * ws_mainthread
 *
 * Main thread for webserver - this accepts connections
 * and spawns a handler thread for each incoming connection.
 *
 * For a persistant connection, these threads will be 
 * long-lived, otherwise, they will terminate as soon as
 * the request has been honored.
 *
 * These client threads will, of course, be detached
 */
void *ws_mainthread(void *arg) {
    int fd;
    int err;
    WS_PRIVATE *pwsp = (WS_PRIVATE*)arg;
    WS_CONNINFO *pwsc;
    pthread_t tid;
    char hostname[MAX_HOSTNAME+1];
    struct in_addr hostaddr;

    DPRINTF(E_SPAM,L_WS,"Entering ws_mainthread\n");

    while(1) {
        pwsc=(WS_CONNINFO*)malloc(sizeof(WS_CONNINFO));
        if(!pwsc) {
            /* can't very well service any more threads! */
            DPRINTF(E_FATAL,L_WS,"Error: %s\n",strerror(errno));
            pwsp->running=0;
            return NULL;
        }

        memset(pwsc,0,sizeof(WS_CONNINFO));

        if((fd=u_accept(pwsp->server_fd,&hostaddr)) == -1) {
            DPRINTF(E_LOG,L_WS,"Dispatcher: accept failed: %s\n",strerror(errno));
            shutdown(pwsp->server_fd,SHUT_RDWR);
            r_close(pwsp->server_fd);
            pwsp->running=0;
            free(pwsc);

            DPRINTF(E_FATAL,L_WS,"Dispatcher: Aborting\n");
            return NULL;
        }

        strncpy(hostname,inet_ntoa(hostaddr),MAX_HOSTNAME);

        pwsc->hostname=strdup(hostname);
        pwsc->fd=fd;
        pwsc->pwsp = pwsp;

        /* Spawn off a dispatcher to decide what to do with
         * the request
         */

        /* don't really care if it locks or not */
        ws_lock_unsafe();
        pwsc->threadno=pwsp->threadno;
        pwsp->threadno++;
        /* we'll hold the unsafe until the dispatch thread is registered */

        /* now, throw off a dispatch thread */
        if((err=pthread_create(&tid,NULL,ws_dispatcher,(void*)pwsc))) {
            pwsc->error=err;
            DPRINTF(E_FATAL,L_WS,"Could not spawn thread: %s\n",strerror(err));
            ws_close(pwsc);
        } else {
            ws_add_dispatch_thread(pwsp,pwsc);
            pthread_detach(tid);
        }
        ws_unlock_unsafe();
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_mainthred\n");
}


/*
 * ws_close
 *
 * Close the connection.  This might be called when things
 * are already in bad shape, so we'll ignore errors and let
 * them be detected back in either the dispatch
 * thread or the main server thread
 *
 * Mainly, we just want to make sure that any
 * allocated memory has been freed
 */
void ws_close(WS_CONNINFO *pwsc) {
    WS_PRIVATE *pwsp = (WS_PRIVATE *)(pwsc->pwsp);

    DPRINTF(E_SPAM,L_WS,"Entering ws_close\n");

    DPRINTF(E_DBG,L_WS,"Thread %d: Terminating\n",pwsc->threadno);
    DPRINTF(E_DBG,L_WS,"Thread %d: Freeing request headers\n",pwsc->threadno);
    ws_freearglist(&pwsc->request_headers);
    DPRINTF(E_DBG,L_WS,"Thread %d: Freeing response headers\n",pwsc->threadno);
    ws_freearglist(&pwsc->response_headers);
    DPRINTF(E_DBG,L_WS,"Thread %d: Freeing request vars\n",pwsc->threadno);
    ws_freearglist(&pwsc->request_vars);
    if(pwsc->uri) {
        free(pwsc->uri);
        pwsc->uri=NULL;
    }
    
    if((pwsc->close)||(pwsc->error)) {
        DPRINTF(E_DBG,L_WS,"Thread %d: Closing fd\n",pwsc->threadno);
        shutdown(pwsc->fd,SHUT_RDWR);
        r_close(pwsc->fd);
        /* this thread is done */

        ws_remove_dispatch_thread(pwsp, pwsc);

        /* Get rid of the local storage */
        if(pwsc->local_storage) {
            if(pwsc->storage_callback) {
                pwsc->storage_callback(pwsc->local_storage);
                pwsc->local_storage=NULL;
                pwsc->storage_callback=NULL;
            }
        }
    
        free(pwsc->hostname);
        memset(pwsc,0x00,sizeof(WS_CONNINFO));
        free(pwsc);
        DPRINTF(E_SPAM,L_WS,"Exiting ws_close (thread terminating)\n");
        pthread_exit(NULL);
    }
    DPRINTF(E_SPAM,L_WS,"Exiting ws_close (thread continuing)\n");
}

/*
 * ws_freearglist
 *
 * Walks through an arg list freeing as it goes
 */
void ws_freearglist(ARGLIST *root) {
    ARGLIST *current;

    DPRINTF(E_SPAM,L_WS,"Entering ws_freearglist\n");

    while(root->next) {
        free(root->next->key);
        free(root->next->value);
        current=root->next;
        root->next=current->next;
        free(current);
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_freearglist\n");
}


void ws_emitheaders(WS_CONNINFO *pwsc) {
    ARGLIST *pcurrent=pwsc->response_headers.next;

    DPRINTF(E_SPAM,L_WS,"Entering ws_emitheaders\n");
    while(pcurrent) {
        DPRINTF(E_DBG,L_WS,"Emitting reponse header %s: %s\n",pcurrent->key,
                pcurrent->value);
        ws_writefd(pwsc,"%s: %s\r\n",pcurrent->key,pcurrent->value);
        pcurrent=pcurrent->next;
    }

    ws_writefd(pwsc,"\r\n");
    DPRINTF(E_SPAM,L_WS,"Exitin ws_emitheaders\n");
}


/*
 * ws_getpostvars
 *
 * Receive and parse headers.  These will trump
 * get headers
 */
int ws_getpostvars(WS_CONNINFO *pwsc) {
    char *content_length;
    int length;
    char *buffer;

    DPRINTF(E_SPAM,L_WS,"Entering ws_getpostvars\n");

    content_length = ws_getarg(&pwsc->request_headers,"Content-Length");
    if(!content_length) {
        pwsc->error = EINVAL;
        return -1;
    }

    length=atoi(content_length);
    DPRINTF(E_DBG,L_WS,"Thread %d: Post var length: %d\n",
            pwsc->threadno,length);

    buffer=(char*)malloc(length+1);

    if(!buffer) {
        pwsc->error = errno;
        DPRINTF(E_INF,L_WS,"Thread %d: Could not malloc %d bytes\n",
                pwsc->threadno, length);
        return -1;
    }

    // make the read time out 30 minutes like we said in the
    // /server-info response
    if((readtimed(pwsc->fd, buffer, length, 1800.0)) == -1) {
        DPRINTF(E_INF,L_WS,"Thread %d: Timeout reading post vars\n",
                pwsc->threadno);
        pwsc->error=errno;
        return -1;
    }

    DPRINTF(E_DBG,L_WS,"Thread %d: Read post vars: %s\n",pwsc->threadno,buffer);

    pwsc->error=ws_getgetvars(pwsc,buffer);
    
    free(buffer);

    DPRINTF(E_SPAM,L_WS,"Exiting ws_getpostvars\n");
    return pwsc->error;
}


/*
 * ws_getheaders
 *
 * Receive and parse headers.  This is called from
 * ws_dispatcher
 */
int ws_getheaders(WS_CONNINFO *pwsc) {
    char *first, *last;
    int done;
    char buffer[MAX_LINEBUFFER];

    DPRINTF(E_SPAM,L_WS,"Entering ws_getheaders\n");

    /* Break down the headers into some kind of header list */
    done=0;
    while(!done) {
        if(readline(pwsc->fd,buffer,sizeof(buffer)) == -1) {
            pwsc->error=errno;
            DPRINTF(E_INF,L_WS,"Thread %d: Unexpected close\n",pwsc->threadno);
            return -1;
        }
        
        DPRINTF(E_DBG,L_WS,"Thread %d: Read: %s",pwsc->threadno,buffer);

        first=buffer;
        if(buffer[0] == '\r')
            first=&buffer[1];

        /* trim the trailing \n */
        if(first[strlen(first)-1] == '\n')
            first[strlen(first)-1] = '\0';

        if(strlen(first) == 0) {
            DPRINTF(E_DBG,L_WS,"Thread %d: Headers parsed!\n",pwsc->threadno);
            done=1;
        } else {
            /* we have a header! */
            last=first;
            strsep(&last,":");

            if(last==first) {
                DPRINTF(E_WARN,L_WS,"Thread %d: Invalid header: %s\n",
                        pwsc->threadno,first);
            } else {
                while(*last==' ')
                    last++;

                while(last[strlen(last)-1] == '\r')
                    last[strlen(last)-1] = '\0';

                DPRINTF(E_DBG,L_WS,"Thread %d: Adding header *%s=%s*\n",
                        pwsc->threadno,first,last);

                if(ws_addarg(&pwsc->request_headers,first,"%s",last)) {
                    DPRINTF(E_FATAL,L_WS,"Thread %d: Out of memory\n",
                            pwsc->threadno);
                    pwsc->error=ENOMEM;
                    return -1;
                }
            }
        }
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_getheaders\n");
    return 0;
}


/*
 * ws_encoding_hack
 */
int ws_encoding_hack(WS_CONNINFO *pwsc) {
    char *user_agent;
    int space_as_plus=1;

    user_agent=ws_getrequestheader(pwsc, "user-agent");
    if(user_agent) {
        if(strncasecmp(user_agent,"Roku",4) == 0) 
            space_as_plus=0;
        if(strncasecmp(user_agent,"iTunes",6) == 0)
            space_as_plus=0;
    }
    return space_as_plus;
}


/*
 * ws_getgetvars
 *
 * parse a GET string of variables (or POST)
 * 
 */
int ws_getgetvars(WS_CONNINFO *pwsc, char *string) {
    char *first, *last, *middle;
    char *key, *value;
    int done;

    int space_as_plus;

    DPRINTF(E_DBG,L_WS,"Thread %d: Entering ws_getgetvars (%s)\n",
            pwsc->threadno,string);

    space_as_plus=ws_encoding_hack(pwsc);

    done=0;

    first=string;
    
    while((!done) && (first)) {
        last=middle=first;
        strsep(&last,"&");
        strsep(&middle,"=");
        
        if(!middle) {
            DPRINTF(E_WARN,L_WS,"Thread %d: Bad arg: %s\n",
                    pwsc->threadno,first);
        } else {
            key=ws_urldecode(first,space_as_plus);
            value=ws_urldecode(middle,space_as_plus);
            
            DPRINTF(E_DBG,L_WS,"Thread %d: Adding arg %s = %s\n",
                    pwsc->threadno,key,value);
            ws_addarg(&pwsc->request_vars,key,"%s",value);

            free(key);
            free(value);
        }
        
        if(!last) {
            DPRINTF(E_DBG,L_WS,"Thread %d: Done parsing GET/POST args!\n",
                    pwsc->threadno);
            done=1;
        } else {
            first=last;
        }
    }

    DPRINTF(E_SPAM,L_WS,"Exiting ws_getgetvars\n");
    return 0;
}


/*
 * ws_dispatcher
 *
 * Main dispatch thread.  This gets the request, reads the
 * headers, decodes the GET'd or POST'd variables,
 * then decides what function should service the request
 */
void *ws_dispatcher(void *arg) {
    WS_CONNINFO *pwsc=(WS_CONNINFO*)arg;
    WS_PRIVATE *pwsp=pwsc->pwsp;
    char buffer[MAX_LINEBUFFER];
    char *first,*last;
    int connection_done=0;
    int can_dispatch;
    char *auth, *username, *password;
    int hdrs,handler;
    time_t now;
    struct tm now_tm;
    void (*req_handler)(WS_CONNINFO*);
    int(*auth_handler)(WS_CONNINFO*, char *, char *);

    DPRINTF(E_DBG,L_WS,"Thread %d: Entering ws_dispatcher (Connection from %s)\n",
            pwsc->threadno, pwsc->hostname);

    /* quick fence to ensure that we have been registered on the thread list */
    ws_lock_unsafe();
    ws_unlock_unsafe();
        
    while(!connection_done) {
        /* Now, get the request from the other end
         * and decide where to dispatch it
         */

        /* DWB: set timeout to 30 minutes as advertised in the
           server-info response. */
        if((readlinetimed(pwsc->fd,buffer,sizeof(buffer),1800.0)) < 1) {
            pwsc->error=errno;
            pwsc->close=1;
            DPRINTF(E_WARN,L_WS,"Thread %d:  could not read: %s\n",
                    pwsc->threadno,strerror(errno));
            ws_close(pwsc);
            return NULL;
        }

        DPRINTF(E_DBG,L_WS,"Thread %d: got request\n",pwsc->threadno);
        DPRINTF(E_DBG - 1,L_WS, "Request: %s", buffer);

        first=last=buffer;
        strsep(&last," ");
        if(!last) {
            pwsc->close=1;
            ws_returnerror(pwsc,400,"Bad request\n");
            ws_close(pwsc);
            DPRINTF(E_SPAM,L_WS,"Error: bad request.  Exiting ws_dispatcher\n");
            return NULL;
        }
        
        if(!strcasecmp(first,"get")) {
            pwsc->request_type = RT_GET;
        } else if(!strcasecmp(first,"post")) {
            pwsc->request_type = RT_POST;
        } else {
            /* return a 501 not implemented */
            pwsc->error=EINVAL;
            pwsc->close=1;
            ws_returnerror(pwsc,501,"Not implemented");
            ws_close(pwsc);
            DPRINTF(E_SPAM,L_WS,"Error: not get or post.  Exiting ws_dispatcher\n");
            return NULL;
        }

        first=last;
        strsep(&last," ");
        pwsc->uri=strdup(first);
        
        /* Get headers */
        if((ws_getheaders(pwsc)) || (!last)) { /* didn't provide a HTTP/1.x */
            /* error already set */
            DPRINTF(E_LOG,L_WS,"Thread %d: Couldn't parse headers - aborting\n",
                    pwsc->threadno);
            pwsc->close=1;
            ws_close(pwsc);
            return NULL;
        }


        /* Now that we have the headers, we can
         * decide whether or not this is a persistant
         * connection */
        if(strncasecmp(last,"HTTP/1.0",8)==0) { /* defaults to non-persistant */
            pwsc->close=!ws_testarg(&pwsc->request_headers,"connection","keep-alive");
        } else { /* default to persistant for HTTP/1.1 and above */
            pwsc->close=ws_testarg(&pwsc->request_headers,"connection","close");
        }

        DPRINTF(E_DBG,L_WS,"Thread %d: Connection type %s: Connection: %s\n",
                pwsc->threadno, last, pwsc->close ? "non-persist" : "persist");

        if(!pwsc->uri) {
            pwsc->error=ENOMEM;
            pwsc->close=1; /* force a full close */
            DPRINTF(E_LOG,L_WS,"Thread %d: Error allocation URI\n",
                    pwsc->threadno);
            ws_returnerror(pwsc,500,"Internal server error");
            ws_close(pwsc);
            return NULL;
        }
        
        /* trim the URI */
        first=pwsc->uri;
        strsep(&first,"?");
        
        if(first) { /* got some GET args */
            DPRINTF(E_DBG,L_WS,"Thread %d: parsing GET args\n",pwsc->threadno);
            ws_getgetvars(pwsc,first);
        }

        /* fix the URI by un urldecoding it */
        
        DPRINTF(E_DBG,L_WS,"Thread %d: Original URI: %s\n",
                pwsc->threadno,pwsc->uri);
        
        first=ws_urldecode(pwsc->uri,ws_encoding_hack(pwsc));
        free(pwsc->uri);
        pwsc->uri=first;

        /* Strip out the proxy stuff - iTunes 4.5 */
        first=strstr(pwsc->uri,"://");
        if(first) {
            first += 3;
            first=strchr(first,'/');
            if(first) {
                first=strdup(first);
                free(pwsc->uri);
                pwsc->uri=first;
            }
        }
        
        
        DPRINTF(E_DBG,L_WS,"Thread %d: Translated URI: %s\n",pwsc->threadno,
                pwsc->uri);

        /* now, parse POST args */
        if(pwsc->request_type == RT_POST)
            ws_getpostvars(pwsc);

        hdrs=1;

        handler=ws_findhandler(pwsp,pwsc,&req_handler,&auth_handler,&hdrs);

        time(&now);
        DPRINTF(E_DBG,L_WS,"Thread %d: Time is %d seconds after epoch\n",
                pwsc->threadno,now);
        gmtime_r(&now,&now_tm);
        DPRINTF(E_DBG,L_WS,"Thread %d: Setting time header\n",pwsc->threadno);
        ws_addarg(&pwsc->response_headers,"Date", 
                  "%s, %d %s %d %02d:%02d:%02d GMT",
                  ws_dow[now_tm.tm_wday],now_tm.tm_mday,
                  ws_moy[now_tm.tm_mon],now_tm.tm_year + 1900,
                  now_tm.tm_hour,now_tm.tm_min,now_tm.tm_sec);

        if(hdrs) {
            ws_addarg(&pwsc->response_headers,"Connection",
                      pwsc->close ? "close" : "keep-alive");
            
            ws_addarg(&pwsc->response_headers,"Server",
                      "mt-daapd/" VERSION);
            
            ws_addarg(&pwsc->response_headers,"Content-Type","text/html");
            ws_addarg(&pwsc->response_headers,"Content-Language","en_us");
        }

        /* Find the appropriate handler and dispatch it */
        if(handler == -1) {
            DPRINTF(E_DBG,L_WS,"Thread %d: Using default handler.\n",
                    pwsc->threadno);
            ws_defaulthandler(pwsp,pwsc);
        } else {
            DPRINTF(E_DBG,L_WS,"Thread %d: Using non-default handler\n",
                    pwsc->threadno);

            can_dispatch=0;
            /* If an auth handler is registered, but it accepts a 
             * username and password of NULL, then don't bother 
             * authing. 
             */
            if((auth_handler) && (auth_handler(pwsc,NULL,NULL)==0)) {
                /* do the auth thing */
                auth=ws_getarg(&pwsc->request_headers,"Authorization");
                if(auth) {
                    ws_decodepassword(auth,&username,&password);
                    if(auth_handler(pwsc,username,password))
                        can_dispatch=1;
                    ws_addarg(&pwsc->request_vars,"HTTP_USER",username);
                    ws_addarg(&pwsc->request_vars,"HTTP_PASSWD",password);
                    free(username); /* this frees password too */
                } 

                if(!can_dispatch) { /* auth failed, or need auth */
                    //ws_addarg(&pwsc->response_headers,"Connection","close");
                    ws_addarg(&pwsc->response_headers,"WWW-Authenticate",
                              "Basic realm=\"webserver\"");
                    ws_returnerror(pwsc,401,"Unauthorized");
                    pwsc->error=0;
                }
            } else {
                can_dispatch=1;
            }

            if(can_dispatch) {
                if(req_handler)
                    req_handler(pwsc);
                else
                    ws_defaulthandler(pwsp,pwsc);               
            }
        }

        if((pwsc->close) || (pwsc->error) || (pwsp->stop)) {
            pwsc->close=1;
            connection_done=1;
        }
        ws_close(pwsc);
    }
    DPRINTF(E_SPAM,L_WS,"Exiting ws_dispatcher\n");
    return NULL;
}


/*
 * ws_writefd
 *
 * Write a printf-style output to a connfd
 */
int ws_writefd(WS_CONNINFO *pwsc, char *fmt, ...) {
    char buffer[1024];
    va_list ap;

    DPRINTF(E_SPAM,L_WS,"Entering ws_writefd\n");

    va_start(ap, fmt);
    vsnprintf(buffer, 1024, fmt, ap);
    va_end(ap);

    DPRINTF(E_SPAM,L_WS,"Exiting ws_writefd\n");
    return r_write(pwsc->fd,buffer,strlen(buffer));
}

/**
* write a blob od data to the connfd
*/
int ws_writebinary(WS_CONNINFO *pwsc, char *data, int len) {
    return r_write(pwsc->fd,data,len);
}



/*
 * ws_returnerror
 *
 * return a particular error code to the requesting
 * agent
 *
 * This will always succeed.  If it cannot, it will
 * just close the connection with prejudice.
 */
int ws_returnerror(WS_CONNINFO *pwsc,int error, char *description) {
    char *useragent;

    DPRINTF(E_WARN,L_WS,"Thread %d: Entering ws_returnerror (%d: %s)\n",
            pwsc->threadno,error,description);
    ws_writefd(pwsc,"HTTP/1.1 %d %s\r\n",error,description);
    
    /* we'll force a close here unless the user agent is
       iTunes, which seems to get pissy about it */
    useragent = ws_getarg(&pwsc->request_headers,"User-Agent");
    if((useragent) && (strncmp(useragent,"iTunes",6) == 0) && (error == 401)) {
        ws_addarg(&pwsc->response_headers,"Connection","keep-alive");
        ws_addarg(&pwsc->response_headers,"Content-Length","2");
        ws_emitheaders(pwsc);
        ws_writefd(pwsc,"\r\n");
        return 0;
    }

    pwsc->close=1;
    ws_addarg(&pwsc->response_headers,"Connection","close");

    ws_emitheaders(pwsc);

    ws_writefd(pwsc,"<HTML>\r\n<TITLE>");
    ws_writefd(pwsc,"%d %s</TITLE>\r\n<BODY>",error,description);
    ws_writefd(pwsc,"\r\n<H1>%s</H1>\r\n",description);
    ws_writefd(pwsc,"Error %d\r\n<hr>\r\n",error);
    ws_writefd(pwsc,"<i>mt-daapd: %s\r\n<br>",VERSION);
    if(errno) 
        ws_writefd(pwsc,"Error: %s\r\n",strerror(errno));

    ws_writefd(pwsc,"</i></BODY>\r\n</HTML>\r\n");

    DPRINTF(E_SPAM,L_WS,"Exiting ws_returnerror\n");
    return 0;
}

/*
 * ws_defaulthandler
 *
 * default URI handler.  This simply finds the file
 * and serves it up
 */
void ws_defaulthandler(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc) {
    char path[PATH_MAX];
    char resolved_path[PATH_MAX];
    int file_fd;
    off_t len;
    
    DPRINTF(E_SPAM,L_WS,"Entering ws_defaulthandler\n");

    snprintf(path,PATH_MAX,"%s/%s",pwsp->wsconfig.web_root,pwsc->uri);
    if(!realpath(path,resolved_path)) {
        pwsc->error=errno;
        DPRINTF(E_WARN,L_WS,"Exiting ws_defaulthandler: Cannot resolve %s\n",path);
        ws_returnerror(pwsc,404,"Not found");
        ws_close(pwsc);
        return;
    }

    DPRINTF(E_DBG,L_WS,"Thread %d: Preparing to serve %s\n",
            pwsc->threadno, resolved_path);

    if(strncmp(resolved_path,pwsp->wsconfig.web_root,
               strlen(pwsp->wsconfig.web_root))) {
        pwsc->error=EINVAL;
        DPRINTF(E_WARN,L_WS,"Exiting ws_defaulthandler: Thread %d: "
                "Requested file %s out of root\n",
                pwsc->threadno,resolved_path);
        ws_returnerror(pwsc,403,"Forbidden");
        ws_close(pwsc);
        return;
    }

    file_fd=open(resolved_path,O_RDONLY);
    if(file_fd == -1) {
        pwsc->error=errno;
        DPRINTF(E_WARN,L_WS,"Exiting ws_defaulthandler: Thread %d: "
                "Error opening %s: %s\n",
                pwsc->threadno,resolved_path,strerror(errno));
        ws_returnerror(pwsc,404,"Not found");
        ws_close(pwsc);
        return;
    }
    
    /* set the Content-Length response header */
    len=lseek(file_fd,0,SEEK_END);

    /* FIXME: assumes off_t == long */
    if(len != -1) {
        /* we have a real length */
        DPRINTF(E_DBG,L_WS,"Length of file is %ld\n",(long)len);
        ws_addarg(&pwsc->response_headers,"Content-Length","%ld",(long)len);
        lseek(file_fd,0,SEEK_SET);
    }


    ws_writefd(pwsc,"HTTP/1.1 200 OK\r\n");
    ws_emitheaders(pwsc);

    /* now throw out the file */
    copyfile(file_fd,pwsc->fd);

    r_close(file_fd);
    DPRINTF(E_DBG,L_WS,"Exiting ws_defaulthandler: "
            "Thread %d: Served successfully\n",
            pwsc->threadno);
    return;
}


/*
 * ws_testrequestheader
 *
 * Check to see if a request header is a particular value
 *
 * Example:
 *
 */
int ws_testrequestheader(WS_CONNINFO *pwsc, char *header, char *value) {
    return ws_testarg(&pwsc->request_headers,header,value);
}

/*
 * ws_testarg
 *
 * Check an arg for a particular value
 *
 * Example:
 *
 * pwsc->close=ws_queryarg(&pwsc->request_headers,"Connection","close");
 *
 */
int ws_testarg(ARGLIST *root, char *key, char *value) {
    char *retval;
    int result;


    DPRINTF(E_DBG,L_WS,"Checking to see if %s matches %s\n",key,value);

    retval=ws_getarg(root,key);
    if(!retval) {
        DPRINTF(E_DBG,L_WS,"Nope!\n");
        return 0;
    }

    result=!strcasecmp(value,retval);
    DPRINTF(E_DBG,L_WS,"And it %s\n",result ? "DOES!" : "does NOT");
    return result;
}

/*
 * ws_getarg
 *
 * Find an argument in an argument list
 *
 * returns a pointer to the value if successful,
 * NULL otherwise.
 *
 * This should be passed the pointer to the
 * stub in the pwsc.
 *
 * Ex: ws_getarg(pwsc->request_headers,"Connection");
 */
char *ws_getarg(ARGLIST *root, char *key) {
    ARGLIST *pcurrent=root->next;

    while((pcurrent)&&(strcasecmp(pcurrent->key,key)))
        pcurrent=pcurrent->next;

    if(pcurrent)
        return pcurrent->value;

    return NULL;
}


/*
 * ws_addarg
 *
 * Add an argument to an arg list
 *
 * This will strdup the passed key and value.
 * The arglist will then have to be freed.  This should
 * be done in ws_close, and handler functions will
 * have to remember to ws_close them.
 *
 * RETURNS
 *   -1 on failure, with errno set (ENOMEM)
 *    0 on success
 */
int ws_addarg(ARGLIST *root, char *key, char *fmt, ...) {
    char *newkey;
    char *newvalue;
    ARGLIST *pnew;
    ARGLIST *current;
    va_list ap;
    char value[MAX_LINEBUFFER];

    va_start(ap,fmt);
    vsnprintf(value,sizeof(value),fmt,ap);
    va_end(ap);

    newkey=strdup(key);
    newvalue=strdup(value);
    pnew=(ARGLIST*)malloc(sizeof(ARGLIST));

    if((!pnew)||(!newkey)||(!newvalue))
        return -1;

    pnew->key=newkey;
    pnew->value=newvalue;

    /* first, see if the key exists... if it does, simply
     * replace it rather than adding a duplicate key
     */

    current=root->next;
    while(current) {
        if(!strcasecmp(current->key,key)) {
            /* got a match! */
            DPRINTF(E_DBG,L_WS,"Updating %s from %s to %s\n",
                    key,current->value,value);
            free(current->value);
            current->value = newvalue;
            free(newkey);
            free(pnew);
            return 0;
        }
        current=current->next;
    }


    pnew->next=root->next;
    DPRINTF(E_DBG,L_WS,"Added *%s=%s*\n",newkey,newvalue);
    root->next=pnew;

    return 0;
}

/*
 * ws_urldecode
 *
 * decode a urlencoded string
 *
 * the returned char will be malloced -- it must be
 * freed by the caller
 *
 * returns NULL on error (ENOMEM)
 */
char *ws_urldecode(char *string, int space_as_plus) {
    char *pnew;
    char *src,*dst;
    int val=0;

    pnew=(char*)malloc(strlen(string)+1);
    if(!pnew)
        return NULL;

    src=string;
    dst=pnew;

    while(*src) {
        switch(*src) {
        case '+':
            if(space_as_plus) {
                *dst++=' ';
            } else {
                *dst++=*src;
            }
            src++;
            break;
        case '%':
            /* this is hideous */
            src++;
            if(*src) {
                if((*src <= '9') && (*src >='0'))
                    val=(*src - '0');
                else if((tolower(*src) <= 'f')&&(tolower(*src) >= 'a'))
                    val=10+(tolower(*src) - 'a');
                src++;
            }
            if(*src) {
                val *= 16;
                if((*src <= '9') && (*src >='0'))
                    val+=(*src - '0');
                else if((tolower(*src) <= 'f')&&(tolower(*src) >= 'a'))
                    val+=(10+(tolower(*src) - 'a'));
                src++;
            }
            *dst++=val;
            break;
        default:
            *dst++=*src++;
            break;
        }
    }

    *dst='\0';
    return pnew;
}


/*
 * ws_registerhandler
 *
 * Register a page and auth handler.  Returns 0 on success,
 * returns -1 on failure.
 *
 * If the regex is not well-formed, it returns -1 iwth
 * errno set to EINVAL.  It is up to the caller to use
 * regerror to display a more interesting error message,
 * if appropriate.
 */
int ws_registerhandler(WSHANDLE ws, char *regex, 
                       void(*handler)(WS_CONNINFO*),
                       int(*auth)(WS_CONNINFO *, char *, char *),
                       int addheaders) {
    WS_HANDLER *phandler;
    WS_PRIVATE *pwsp = (WS_PRIVATE *)ws;

    phandler=(WS_HANDLER *)malloc(sizeof(WS_HANDLER));
    if(!phandler)
        return -1;

    if(regcomp(&phandler->regex,regex,REG_EXTENDED | REG_NOSUB)) {
        free(phandler);
        errno=EINVAL;
        return -1;
    }

    phandler->req_handler=handler;
    phandler->auth_handler=auth;
    phandler->addheaders=addheaders;

    ws_lock_unsafe();
    phandler->next=pwsp->handlers.next;
    pwsp->handlers.next=phandler;
    ws_unlock_unsafe();

    return 0;
}

/*
 * ws_findhandler
 *
 * Given a URI, determine the appropriate handler.
 *
 * If a handler is found, it returns 0, otherwise, returns
 * -1
 */
int ws_findhandler(WS_PRIVATE *pwsp, WS_CONNINFO *pwsc, 
                   void(**preq)(WS_CONNINFO*),
                   int(**pauth)(WS_CONNINFO *, char *, char *),
                   int *addheaders) {
    WS_HANDLER *phandler=pwsp->handlers.next;

    ws_lock_unsafe();

    *preq=NULL;

    DPRINTF(E_DBG,L_WS,"Thread %d: Preparing to find handler\n",
            pwsc->threadno);

    while(phandler) {
        if(!regexec(&phandler->regex,pwsc->uri,0,NULL,0)) {
            /* that's a match */
            DPRINTF(E_DBG,L_WS,"Thread %d: URI Match!\n",pwsc->threadno);
            *preq=phandler->req_handler;
            *pauth=phandler->auth_handler;
            *addheaders=phandler->addheaders;
            ws_unlock_unsafe();
            return 0;
        }
        phandler=phandler->next;
    }

    ws_unlock_unsafe();
    return -1;
}

/*
 * ws_decodepassword
 *
 * Given a base64 encoded Authentication request header,
 * decode it into the username and password
 */
int ws_decodepassword(char *header, char **username, char **password) {
    static char ws_xlat[256];
    static int ws_xlat_init=0;
    int index;
    int len;
    int rack=0;
    int pads=0;
    unsigned char *decodebuffer;
    unsigned char *pin, *pout;
    int lookup;

    *username=NULL;
    *password=NULL;

    if(ws_lock_unsafe() == -1)
        return -1;

    if(!ws_xlat_init) {
        ws_xlat_init=1;

        memset((char*)&ws_xlat,0xFF,sizeof(ws_xlat));
        for(index=0; index < 26; index++) {
            ws_xlat['A' + index] = index;
            ws_xlat['a' + index] = index + 26;
        }

        for(index=0; index < 10; index++) {
            ws_xlat['0' + index] = index + 52;
        }

        ws_xlat['+'] = 62;
        ws_xlat['/'] = 63;
    }
    if(ws_unlock_unsafe() == -1)
        return -1;

    /* xlat table is initialized */
    while(*header != ' ')
        header++;

    header++;

    decodebuffer=(unsigned char *)malloc(strlen(header));
    if(!decodebuffer)
        return -1;

    DPRINTF(E_DBG,L_WS,"Preparing to decode %s\n",header);

    memset(decodebuffer,0,strlen(header));
    len=0;
    pout=decodebuffer;
    pin=(unsigned char *)header;

    /* this is more than a little sloppy */
    while(pin[rack]) {
        if(pin[rack] != '=') {
            lookup=ws_xlat[pin[rack]];
            if(lookup == 0xFF) {
                DPRINTF(E_WARN,L_WS,"Got garbage Authenticate header\n");
                return -1;
            }

            /* valid character */
            switch(rack) {
            case 0:
                pout[0]=(lookup << 2);
                break;
            case 1:
                pout[0] |= (lookup >> 4);
                pout[1] = (lookup << 4);
                break;
            case 2:
                pout[1] |= (lookup >> 2);
                pout[2] = (lookup << 6);
                break;
            case 3:
                pout[2] |= lookup;
                break;
            }
            rack++;
        } else {
            /* padding char */
            pads++;
            rack++;
        }

        if(rack == 4) {
            pin += 4;
            pout += 3;

            len += (3-pads);
            rack=0;
        }
    }

    /* we now have the decoded string */
    DPRINTF(E_DBG,L_WS,"Decoded %s\n",decodebuffer);

    *username = (char*)decodebuffer;
    *password = *username;

    strsep(password,":");

    DPRINTF(E_DBG,L_WS,"Decoded user=%s, pw=%s\n",*username,*password);
    return 0;
}

/*
 * ws_addreponseheader
 *
 * Simple wrapper around the CONNINFO response headers
 */
int ws_addresponseheader(WS_CONNINFO *pwsc, char *header, char *fmt, ...) {
    va_list ap;
    char value[MAX_LINEBUFFER];

    va_start(ap,fmt);
    vsnprintf(value,sizeof(value),fmt,ap);
    va_end(ap);

    return ws_addarg(&pwsc->response_headers,header,value);
}

/*
 * ws_getvar
 *
 * Simple wrapper around the CONNINFO request vars
 */
char *ws_getvar(WS_CONNINFO *pwsc, char *var) {
    return ws_getarg(&(pwsc->request_vars),var);
}

char *ws_getrequestheader(WS_CONNINFO *pwsc, char *header) {
    return ws_getarg(&pwsc->request_headers,header);
}

/**
 * get the local storage pointer.
 *
 * @param pwsc connection to get local storage for
 */
void *ws_get_local_storage(WS_CONNINFO *pwsc) {
    return pwsc->local_storage;
}


/**
 * lock the local storage pointer.  This is sort of wrong, as
 * the all operations manipulating local storage are locked,
 * not just the one you are working on.
 * 
 * @param pwsc connection you are working with
 */
void ws_lock_local_storage(WS_CONNINFO *pwsc) {
    WS_PRIVATE *pwsp;
    
    pwsp = (WS_PRIVATE *)pwsc->pwsp;
    ws_lock_connlist(pwsp);
}

void ws_unlock_local_storage(WS_CONNINFO *pwsc) {
    WS_PRIVATE *pwsp;
    
    pwsp = (WS_PRIVATE *)pwsc->pwsp;
    ws_unlock_connlist(pwsp);
}

/**
 * set the local storage pointer (and callback)
 */
void ws_set_local_storage(WS_CONNINFO *pwsc, void *ptr, void (*callback)(void *)) {
    if(!pwsc)
        return;

    if(pwsc->local_storage) {
        DPRINTF(E_FATAL,L_WS,"ls already allocated");
    }
    
    pwsc->storage_callback = callback;
    pwsc->local_storage = ptr;
}

/**
 * walk through the connection list and enumerate all the items
 */
WS_CONNINFO *ws_thread_enum_first(WSHANDLE wsh, WSTHREADENUM *vpp) {
    WS_PRIVATE *pwsp = (WS_PRIVATE *)wsh;
    WS_CONNINFO *pwsc = NULL;
    WS_CONNLIST *pconlist;
    
    ws_lock_connlist(pwsp);
    
    pconlist = pwsp->connlist.next;
    *vpp = (WSTHREADENUM)pconlist;
    if(pconlist) {
        pwsc = pconlist->pwsc;
    } else {
        ws_unlock_connlist(pwsp);
    }
    
    return pwsc;
}

WS_CONNINFO *ws_thread_enum_next(WSHANDLE wsh, WSTHREADENUM *vpp) {
    WS_PRIVATE *pwsp = (WS_PRIVATE *)wsh;
    WS_CONNINFO *pwsc = NULL;
    WS_CONNLIST *pconlist;
    
    pconlist = (WS_CONNLIST*)*vpp;
    if((!pconlist) || (!pconlist->next)) {
        ws_unlock_connlist(pwsp);
    } else {
        pconlist=pconlist->next;
        *vpp = (WSTHREADENUM)pconlist;
        pwsc = pconlist->pwsc;
    }

    return pwsc;
}