EX_browser_sources.c

/*
Copyright (C) 2011 azazello and ezQuake team

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, see <http://www.gnu.org/licenses/>.
*/

#include "quakedef.h"
#include "fs.h"

#ifdef _WIN32
#include "winquake.h"
#else
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#endif
#include <curl/curl.h>

#include "EX_browser.h"

#define SOURCES_LIST_FILENAME "sb/sources.txt"

// sources table
source_data *sources[MAX_SOURCES];
int sourcesn;

extern sem_t serverlist_semaphore;

source_data * Create_Source(void)
{
    source_data *s;
    s = (source_data *) Q_malloc(sizeof(source_data));
    s->serversn = 0;
    s->last_update.wYear = 0;
    s->name[0] = 0;
    s->checked = 0;
    s->servers = NULL;
    s->unique = source_unique++;
    return s;
}

void Reset_Source(source_data *s)
{
    int i;
	if (s->servers != NULL)
    {
        for (i=0; i < s->serversn; i++)
            Q_free(s->servers[i]);
        Q_free(s->servers);
    }
    s->serversn = 0;
    s->last_update.wYear = 0;
    //s->name[0] = 0;
}

// used only for list re-loading
void Delete_Source(source_data *s)
{
    Reset_Source(s);
    Q_free(s);
}

// returns true, if there were some problems (like domain-name addresses)
// which require the source to be dumped to file in corrected form
qbool Update_Source_From_File(source_data *s, char *fname, server_data **servers, int *pserversn)
{
// Whole serverbrowser is so insanely broken and horrid, its heavily marked for removal
	vfsfile_t *f;
	char line[2048] = {0};
    qbool should_dump = false;

    //length = COM_FileOpenRead (fname, &f);
	f = FS_OpenVFS(fname, "rb", FS_ANY);

    if (f) {
		while (VFS_GETS(f, line, sizeof(line)))
		{
			netadr_t addr;

			if (!strchr(line, ':'))
				strlcat (line, ":27000", sizeof (line));
			if (!NET_StringToAdr(line, &addr))
			{
				continue;
			}

			servers[(*pserversn)++] = Create_Server2(addr);
			if (line[0] <= '0'  ||  line[0] >= '9')
				should_dump = true;
		}
		VFS_CLOSE(f);
    } else {
        //Com_Printf ("Updating %15.15s failed: file not found\n", s->name);
        // ?????? should_dump = true;
	}

    return should_dump;
}

static size_t SB_URL_to_FileName(const char *str, char *dest, size_t size)
{
	size_t written = 0;
	char *hexa = "0123456789abcdef";
	
	while (*str != '\0' && written + 1 < size) {
		if (isalnum(*str) || *str == '.') {
			*dest++ = *str++;
			written++;
		}
		else {
			if (written + 1 < size) {
				int curchar = *str++;
				written += 3;

				*dest++ = '_';
				*dest++ = hexa[curchar / 16];
				*dest++ = hexa[curchar % 16];
			}
			else {
				break;
			}
		}
	}
	*dest = '\0';

	return written;
}

static size_t SB_URL_To_Filename_Length(const char *s)
{
	return strlen(s)*3+1;
}

void Precache_Source(source_data *s)
{
    int i;
    char name[1024];
    server_data *servers[MAX_SERVERS];
    int serversn = 0;

	if (s->type == type_url) {
		char *filename;
		size_t filename_size = SB_URL_To_Filename_Length(s->address.url);

		filename = Q_malloc(filename_size);
		SB_URL_to_FileName(s->address.url, filename, filename_size);
		snprintf(name, sizeof (name), "sb/cache/%s", filename);
		Q_free(filename);
	}
	else if (s->type == type_master) {
		snprintf(name, sizeof (name), "sb/cache/%d_%d_%d_%d_[%d].txt",
// FIXME IPv4 only (WOHA, lot of addresssSSsssses here
				s->address.address.address.ip[0], s->address.address.address.ip[1],
				s->address.address.address.ip[2], s->address.address.address.ip[3],
				ntohs(s->address.address.port));
	}
	else {
		return;
	}

	Update_Source_From_File(s, name, servers, &serversn);

    if (serversn > 0)
    {
        SYSTEMTIME tm;
        if (GetFileLocalTime(va("%s/ezquake/%s", com_basedir, name), &tm))
        {
            Reset_Source(s);
            s->servers = (server_data **) Q_malloc(serversn * sizeof(server_data *));
            for (i=0; i < serversn; i++)
                s->servers[i] = servers[i];
            s->serversn = serversn;

            if (s->checked)
                rebuild_servers_list = 1;

            memcpy(&s->last_update, &tm, sizeof(SYSTEMTIME));
        }
    }
}

static void SB_Process_URL_Buffer(FILE *f, server_data *servers[],
	int *serversn)
{
	netadr_t addr;
	char buf[32];

	while (fgets(buf, sizeof (buf), f) != NULL) {
		NET_StringToAdr(buf, &addr);
		servers[(*serversn)++] = Create_Server2(addr);
	}
}

static void SB_Update_Source_From_URL(const source_data *s, server_data *servers[],
	int *serversn)
{
	CURL *curl;
	CURLcode res;
	size_t filename_buf_len;
	char *filename;
	FILE *f;
 
	if (s->type != type_url) {
		Com_Printf_State(PRINT_FAIL, "SB_Update_Source_From_URL() Invalid argument\n");
		return;
	}

	curl = curl_easy_init();
	if (curl) {
		curl_easy_setopt(curl, CURLOPT_URL, s->address.url);
	}
	else {
		Com_Printf_State(PRINT_FAIL, "SB_Update_Source_From_URL() Can't init cURL\n");
		return;
	}
	
	filename_buf_len = SB_URL_To_Filename_Length(s->address.url);
	filename = Q_malloc(filename_buf_len);
	SB_URL_to_FileName(s->address.url, filename, filename_buf_len);
	if (!FS_FCreateFile(filename, &f, "ezquake/sb/cache", "wt+")) {
		Com_Printf_State(PRINT_FAIL, "SB_Update_Source_From_URL() Can't open cached file");
		return;
	}

	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, NULL);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, f);

	res = curl_easy_perform(curl);
	if (res != CURLE_OK) {
		Com_Printf("Error: Could not read URL %s\n", s->address.url);
	}

	fseek(f, 0, SEEK_SET);
	
	SB_Process_URL_Buffer(f, servers, serversn);
	fclose(f);
	Q_free(filename);

    /* always cleanup */ 
    curl_easy_cleanup(curl);
}

void Update_Source(source_data *s)
{
    int i;
    qbool should_dump = false;
    server_data *servers[MAX_SERVERS];
    int serversn = 0;

	if (s->type == type_dummy)
        return;

    if (s->type == type_file)
    {
        // read servers from file
        char name[1024];
        snprintf(name, sizeof (name), "sb/%s", s->address.filename);
        should_dump = Update_Source_From_File(s, name, servers, &serversn);
        GetLocalTime(&(s->last_update));
    }

	if (s->type == type_url)
	{	
		SB_Update_Source_From_URL(s, servers, &serversn);
	}

    if (s->type == type_master)
    {
        // get servers from master server
        char request[] = {'c', '\n', '\0'};

        socket_t newsocket;
		struct sockaddr_storage server;
        int ret = 0, i;
        unsigned char answer[10000];
        fd_set fd;
        struct timeval tv;
		int trynum;
		int timeout;

        newsocket = UDP_OpenSocket(NA_IPv4, PORT_ANY);
        // so we have a socket

        // send status request

		for (trynum=0; trynum < sb_masterretries.value; trynum++) {
			NetadrToSockadr (&(s->address.address), &server);
			ret = sendto (newsocket, request, sizeof(request), 0,
						  (struct sockaddr *)&server, sizeof(server) );
		}

        if (ret < 0)
            return;

		timeout = Sys_DoubleTime() + (sb_mastertimeout.value / 1000.0);
		while (Sys_DoubleTime() < timeout) {
			//fd.fd_count = 1;
			//fd.fd_array[0] = newsocket;
			FD_ZERO(&fd);
			FD_SET(newsocket, &fd);
			tv.tv_sec = 0;
			tv.tv_usec = 1000 * 1.5 * sb_mastertimeout.value; // multiply timeout by 1.5
			ret = select(newsocket+1, &fd, NULL, NULL, &tv);

			// get answer
			if (ret > 0)
				ret = recvfrom (newsocket, (char *) answer, 10000, 0, NULL, NULL);

			if (ret > 0  &&  ret < 10000)
			{
				answer[ret] = 0;

				if (memcmp(answer, "\xff\xff\xff\xff\x64\x0a", 6))
				{
					closesocket(newsocket);
					return;
				}

				// create servers avoiding duplicates
				for (i=6; i+5 < ret; i+=6)
				{
					char buf[32];
					server_data* server;
					qbool exists = false;
					int j;

					snprintf(buf, sizeof (buf), "%u.%u.%u.%u:%u",
						(int)answer[i+0], (int)answer[i+1],
						(int)answer[i+2], (int)answer[i+3],
						256 * (int)answer[i+4] + (int)answer[i+5]);

					server = Create_Server(buf);
					for (j=0; j<serversn; j++) {
						if (NET_CompareAdr(servers[j]->address, server->address)) {
							exists = true;
							break;
						}
					}
					
					if (!exists)
						servers[serversn++] = server;
					else
						Delete_Server(server);
				}
			}
		}
 
        closesocket(newsocket);
        
    }

	Sys_SemWait(&serverlist_semaphore);
    // copy all servers to source list
    if (serversn > 0)
    {
        Reset_Source(s);
        s->servers = (server_data **) Q_malloc((serversn + (s->type==type_file ? MAX_UNBOUND : 0)) * sizeof(server_data *));
		for (i=0; i < serversn; i++)
			s->servers[i] = servers[i];
        s->serversn = serversn;

        if (s->checked)
            rebuild_servers_list = 1;

        if (sb_mastercache.value)
		{
			DumpSource(s);
			should_dump = false;
		}
        GetLocalTime(&(s->last_update));
    }
    else
        if (s->type == type_file)
        {
            Reset_Source(s);
            s->servers = (server_data **) Q_malloc((serversn + (s->type==type_file ? MAX_UNBOUND : 0)) * sizeof(server_data *));
        }
    Sys_SemPost(&serverlist_semaphore);
    if (should_dump)
        DumpSource(s);
    //Com_Printf ("Updating %15.15s: %d servers\n", s->name, serversn);
}

int updating_sources = 0;
int source_full_update = 0;

typedef struct infohost_s
{
    double lastsenttime;
    int phase;
} infohost;

source_data **psources;
int psourcesn;
void TP_ExecTrigger (const char *s);

DWORD WINAPI Update_Multiple_Sources_Proc(void * lpParameter)
{
    // get servers from master server
    SYSTEMTIME lt;
    char request[] = {'c', '\n', '\0'};

    socket_t newsocket;
	struct sockaddr_storage server;
    int ret = 0, i, sourcenum;
    unsigned char answer[10000];
    fd_set fd;
    struct timeval tv;
    int total_masters = 0;
    int updated = 0;
    int d1, d2;

    GetLocalTime(&lt);
    d1 = lt.wSecond + 60*(lt.wMinute + 60*(lt.wHour + 24*(lt.wDay)));
    // update file sources - this should be a flash
    for (sourcenum = 0; sourcenum < psourcesn; sourcenum++)
        if (psources[sourcenum]->checked)
        {
            if (psources[sourcenum]->type == type_file)
                Update_Source(psources[sourcenum]);
			if (psources[sourcenum]->type == type_url)
				Update_Source(psources[sourcenum]); // todo cache this too
            else if (psources[sourcenum]->type == type_master)
            {
                source_data *s = psources[sourcenum];
                if (s->last_update.wYear != 0  &&  !source_full_update)
                {
                    d2 = s->last_update.wSecond + 60*(s->last_update.wMinute + 60*(s->last_update.wHour + 24*(s->last_update.wDay)));

                    if (d1 > d2  &&  d1 < d2 + sb_sourcevalidity.value*60)
                    continue;
                }
                total_masters++;
            }
        }
	
    // update master sources
    newsocket = UDP_OpenSocket(NA_IPv4, PORT_ANY);

    for (sourcenum = 0; sourcenum < psourcesn  &&  !abort_ping; sourcenum++)
    {
        server_data *servers[MAX_SERVERS];
        int serversn = 0;
        int trynum = 0;
        source_data *s = psources[sourcenum];
		double timeout;

        if (psources[sourcenum]->type != type_master  ||  !psources[sourcenum]->checked)
            continue;

        if (s->last_update.wYear != 0  &&  !source_full_update)
        {
            d2 = s->last_update.wSecond + 60*(s->last_update.wMinute + 60*(s->last_update.wHour + 24*(s->last_update.wDay)));

            if (d1 > d2  &&  d1 < d2 + sb_sourcevalidity.value*60)
                continue;
        }

		// send trynum queries to master server
        for (trynum=0; trynum < sb_masterretries.value; trynum++)
        {
			NetadrToSockadr (&(s->address.address), &server);
            ret = sendto (newsocket, request, sizeof(request), 0,
                          (struct sockaddr *)&server, sizeof(server) );
		}

		if (ret <= 0)
			continue;

		timeout = Sys_DoubleTime() + (sb_mastertimeout.value / 1000.0);
		while (Sys_DoubleTime() < timeout) {
			struct sockaddr_storage hostaddr;
            netadr_t from;

            //fd.fd_count = 1;
            //fd.fd_array[0] = newsocket;
			FD_ZERO(&fd);
			FD_SET(newsocket, &fd);
            tv.tv_sec = 0;
            tv.tv_usec = 1000 * sb_mastertimeout.value;
            ret = select(newsocket+1, &fd, NULL, NULL, &tv);

            // get answer
            i = sizeof(hostaddr);
            if (ret > 0)
                ret = recvfrom (newsocket, (char *) answer, 10000, 0,
				(struct sockaddr *)&hostaddr, (socklen_t *)&i);

            if (ret > 0  &&  ret < 10000)
            {
                SockadrToNetadr (&hostaddr, &from);
// FIXME IPv4 only addddreessssssss ftw
                if (from.address.ip[0] == s->address.address.address.ip[0] &&
                    from.address.ip[1] == s->address.address.address.ip[1] &&
                    from.address.ip[2] == s->address.address.address.ip[2] &&
                    from.address.ip[3] == s->address.address.address.ip[3] &&
                    from.port == s->address.address.port)
                {
                    answer[ret] = 0;

                    if (memcmp(answer, "\xff\xff\xff\xff\x64\x0a", 6))
                    {
                        continue;
                    }

                    // create servers avoiding duplicates
					for (i=6; i+5 < ret; i+=6)
					{
						char buf[32];
						server_data* server;
						qbool exists = false;
						int j;

						snprintf(buf, sizeof (buf), "%u.%u.%u.%u:%u",
							(int)answer[i+0], (int)answer[i+1],
							(int)answer[i+2], (int)answer[i+3],
							256 * (int)answer[i+4] + (int)answer[i+5]);

						server = Create_Server(buf);
						for (j=0; j<serversn; j++) {
							if (NET_CompareAdr(servers[j]->address, server->address)) {
								exists = true;
								break;
							}
						}
						
						if (!exists)
							servers[serversn++] = server;
						else
							Delete_Server(server);
					}
                }
            }
		}

        // copy all servers to source list
        if (serversn > 0)
        {
			updated++;
            Reset_Source(s);
            s->servers = (server_data **) Q_malloc(serversn * sizeof(server_data *));
            for (i=0; i < serversn; i++)
                s->servers[i] = servers[i];
            s->serversn = serversn;

            if (s->checked)
                rebuild_servers_list = 1;

            GetLocalTime(&(s->last_update));

            if (sb_mastercache.value)
                DumpSource(s);
        }

        ping_pos = updated / (double)total_masters;
    }

    closesocket(newsocket);

	// Not having this here leads to crash almost always when some
	// other action with servers list happens right after this function.
	// Even 1 ms delay was enough during the tests, previously 500 ms was used.
    //Sys_MSleep(100);

    updating_sources = 0;
	TP_ExecTrigger("f_sbupdatesourcesdone");
    return 0;    
}

void Update_Init(source_data *s[], int sn)
{
    psources = s;
    psourcesn = sn;

    abort_ping = 0;
    updating_sources = 1;
    ping_pos = 0;
}

// starts asynchronous sources update
void Update_Multiple_Sources_Begin(source_data *s[], int sn)
{
	Update_Init(s, sn);
    Sys_CreateThread(Update_Multiple_Sources_Proc, NULL);
}

// starts synchronous sources update
void Update_Multiple_Sources(source_data *s[], int sn)
{
	Update_Init(s, sn);
    Update_Multiple_Sources_Proc(NULL);
}

void SB_Sources_Update(qbool full)
{
	source_full_update = full;
	Update_Multiple_Sources(sources, sourcesn);
    if (rebuild_servers_list)
        Rebuild_Servers_List();
}

void SB_Sources_Update_Begin(qbool full)
{
	source_full_update = full;
	Update_Multiple_Sources_Begin(sources, sourcesn);
}

unsigned int SB_Sources_Marked_Count(void)
{
	int i;
	unsigned int ret = 0;

	for (i = 0; i < sourcesn; i++) {
		if (sources[i]->checked == 1) {
			ret++;
		}
	}

	return ret;
}

void Toggle_Source(source_data *s)
{
    s->checked = !(s->checked);
    rebuild_servers_list = 1;
}

void Mark_Source(source_data *s)
{
    if (!s->checked)
    {
        s->checked = 1;
        rebuild_servers_list = 1;
    }
}

void Unmark_Source(source_data *s)
{
    if (s->checked)
    {
        s->checked = 0;
        rebuild_servers_list = 1;
    }
}

char * next_space(char *s)
{
    char *ret = s;
    while (*ret  &&  !isspace2(*ret))
        ret++;
    return ret;
}

char * next_nonspace(char *s)
{
    char *ret = s;
    while (*ret  &&  isspace2(*ret))
        ret++;
    return ret;
}

char * next_quote(char *s)
{
    char *ret = s;
    while (*ret  &&  *ret != '\"')
        ret++;
    return ret;
}

qbool SB_Sources_Dump(void)
{
	FILE *f;
	int i;

	if (!FS_FCreateFile(SOURCES_LIST_FILENAME, &f, "ezquake", "wt")) {
		return false;
	}
 
	for (i = 0; i < sourcesn; i++) {
		sb_source_type_t type = sources[i]->type;

		if (type == type_master || type == type_file || type == type_url) {
			const char *typestr;
			const char *name = sources[i]->name;
			const char *loc;

			if (type == type_master) {
				typestr = "master";
				loc = NET_AdrToString(sources[i]->address.address);
			}
			if (type == type_url) {
				typestr = "url";
				loc = sources[i]->address.url;
			}
			else {
				typestr = "file";
				loc = sources[i]->address.filename;
			}
			
			fprintf(f, "%s \"%s\" %s\n", typestr, name, loc);
		}
	}

	fclose(f);

	return true;
}

int SB_Source_Add(const char* name, const char* address, sb_source_type_t type)
{
	source_data *s;
	char addr[512];
	int pos;

	if (strlen(name) <= 0  ||  strlen(address) <= 0)
		return -1;

	// create new source
	s = Create_Source();
	s->type = type;
	strlcpy (s->name, name, sizeof (s->name));
	strlcpy (addr, address, sizeof (addr));

	if (s->type == type_file) {
		strlcpy (s->address.filename, address, sizeof (s->address.filename));
	}
	else if (s->type == type_url) {
		strlcpy(s->address.url, address, sizeof(s->address.url));
	}
	else {
		if (!strchr(addr, ':')) {
			strlcat (addr, ":27000", sizeof (addr));
		}
		if (!NET_StringToAdr(addr, &(s->address.address))) {
			return -1;
		}
	}

	pos = sourcesn++;
	sources[pos] = s;
	Mark_Source(sources[pos]);
	Update_Source(sources[pos]);

	SB_Sources_Dump();

	return pos;
}

void SB_Source_Remove(int i)
{
    source_data *s;

	if (i < 0 || i >= MAX_SOURCES) {
		return;
	}

	s = sources[i];
    if (s->type == type_dummy)
        return;

	Q_free(sources[i]);

    // remove from SB
    if (i < sourcesn - 1)
    {
		memmove(sources+i,
                sources+i + 1,
                (sourcesn-i-1)*sizeof(*sources));
    }
    sourcesn--;

	SB_Sources_Dump();
}

void Reload_Sources(void)
{
    int i;
	vfsfile_t *f;
	char ln[2048];
    source_data *s;

    for (i=0; i < sourcesn; i++)
        Delete_Source(sources[i]);
    sourcesn = 0;

    // create dummy unbound source
    sources[0] = Create_Source();
    sources[0]->type = type_dummy;
    strlcpy (sources[0]->name, "Unbound", sizeof (sources[0]->name));
    sources[0]->servers = (server_data **) Q_malloc(MAX_UNBOUND*sizeof(server_data *));

	sourcesn = 1;

	f = FS_OpenVFS(SOURCES_LIST_FILENAME, "rb", FS_ANY);
	if (!f) 
	{
        //Com_Printf ("sources file not found: %s\n", SOURCES_PATH);
		return;
	}

    s = Create_Source();
    while (VFS_GETS(f, ln, sizeof(ln)))
    {
		char line[2048];
        char *p, *q;

        if (sscanf(ln, "%[ -~	]s", line) != 1) {
			continue;
		}

        p = next_nonspace(line);
        if (*p == '/')
            continue;   // comment
        q = next_space(p);

		if (!strncmp(p, "master", q-p)) {
            s->type = type_master;
		}
		else if (!strncmp(p, "file", q-p)) {
			s->type = type_file;
		}
		else if (!strncmp(p, "url", q-p)) {
			s->type = type_url;
		}
		else {
			continue;
		}

        p = next_nonspace(q);
        q = (*p == '\"') ? next_quote(++p) : next_space(p);

        if (q-p <= 0)
            continue;

        strlcpy (s->name, p, min(q-p+1, MAX_SOURCE_NAME+1));

        p = next_nonspace(q+1);
        q = next_space(p);
        *q = 0;

        if (q-p <= 0)
            continue;

        if (s->type == type_file)
            strlcpy (s->address.filename, p, sizeof (s->address.filename));
		else if (s->type == type_url)
			strlcpy (s->address.url, p, sizeof (s->address.url));
        else
            if (!NET_StringToAdr(p, &(s->address.address)))
                continue;

        sources[sourcesn] = Create_Source();
        i = sources[sourcesn]->unique;
        memcpy(sources[sourcesn], s, sizeof(source_data));
        sources[sourcesn]->unique = i;
        sourcesn++;
    }

    Delete_Source(s);
	VFS_CLOSE(f);

    //Com_Printf("Read %d sources for Server Browser\n", sourcesn);

    // update all file sources
    for (i=0; i < sourcesn; i++)
        if (sources[i]->type == type_file)
            Update_Source(sources[i]);
        else if (sources[i]->type == type_master || sources[i]->type == type_url)
            Precache_Source(sources[i]);

    rebuild_servers_list = 1;
    resort_sources = 1;
}

int rebuild_servers_list = 0;

void Rebuild_Servers_List(void)
{
    int i;
    serversn = 0;
	
    rebuild_servers_list = 0;
	Sys_SemWait(&serverlist_semaphore);

    for (i=0; i < sourcesn; i++)
        if (sources[i]->checked)
        {
            int j;
            for (j=0; j < sources[i]->serversn; j++)
            {
                int k;
                for (k=0; k < serversn; k++)
                    if (!memcmp(&(servers[k]->address),
                        &(sources[i]->servers[j]->address),
                        sizeof(netadr_t)))
                        break;
                if (k == serversn)  // if not on list yet
                    servers[serversn++] = sources[i]->servers[j];
            }
        }
    resort_servers = 1;
    rebuild_all_players = 1;
    Servers_pos = 0;
    serversn_passed = serversn;

	Sys_SemPost(&serverlist_semaphore);
}

void DumpSource(source_data *s)
{
    FILE *f;
    int i;
    char buf[1024];

    if (s->type == type_file)
        snprintf(buf, sizeof (buf), "sb/%s", s->address.filename);
    else if (s->type == type_master)
    {
        Sys_mkdir("sb/cache");
        snprintf(buf, sizeof (buf), "sb/cache/%d_%d_%d_%d_[%d].txt",
// FIXME IPv4 only
                s->address.address.address.ip[0], s->address.address.address.ip[1],
                s->address.address.address.ip[2], s->address.address.address.ip[3],
                ntohs(s->address.address.port));
    }
    else
        return;

//    f = fopen(buf, "wt");
//    if (f == NULL)
//        return;
    if (!FS_FCreateFile(buf, &f, "ezquake", "wt"))
        return;

    for (i=0; i < s->serversn; i++)
        fprintf(f, "%d.%d.%d.%d:%d\n",
// FIXME IPv4 only
        s->servers[i]->address.address.ip[0], s->servers[i]->address.address.ip[1],
        s->servers[i]->address.address.ip[2], s->servers[i]->address.address.ip[3],
        ntohs(s->servers[i]->address.port));

    fclose(f);
}

void AddUnbound(server_data *s)
{
    if (sources[0]->serversn >= MAX_UNBOUND)
        return;

    if (IsInSource(sources[0], s))
        return;

    sources[0]->servers[sources[0]->serversn] = s;
    (sources[0]->serversn) ++;
    rebuild_servers_list = true;
}

void RemoveFromFileSource(source_data *source, server_data *serv)
{
    int i;
    
    if (source->serversn <= 0)
        return;

    for (i=0; i < source->serversn; i++)
        if (!memcmp(&source->servers[i]->address, &serv->address, 6))
        {
            // add to unbound
            AddUnbound(serv);

            // remove from source
            if (i != source->serversn - 1)
            {
                memmove(source->servers+i,
                        source->servers+i+1,
                        (source->serversn - i - 1) * sizeof(source_data *));
            }
            (source->serversn) --;
            DumpSource(source);
            Mark_Source(sources[0]);
            return;
        }
}

void AddToFileSource(source_data *source, server_data *serv)
{
    if (IsInSource(source, serv))
        return;

    source->servers[source->serversn] = serv;
    (source->serversn) ++;
    rebuild_servers_list = true;

    DumpSource(source);
    Mark_Source(sources[0]);
}