forked from bartvdbraak/blender
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/*
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* Master server communication code.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "verse.h"
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#include "v_util.h"
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#include "vs_server.h"
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#define MASTER_SERVER_PERIOD (60.0) /* Period between ANNOUNCE to master server, in seconds. */
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static struct {
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boolean enabled;
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boolean started;
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const char *master;
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char desc[64];
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const char *tags;
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VUtilTimer timer;
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} server_info;
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#define LEFT(d) (sizeof server_info.desc - (d - server_info.desc) - 1)
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void vs_master_set_enabled(boolean enabled)
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{
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server_info.enabled = enabled;
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}
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const char * vs_master_get_address(void)
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{
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return server_info.master;
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}
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void vs_master_set_address(const char *address)
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{
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server_info.master = address;
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}
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void vs_master_set_desc(const char *desc)
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{
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const char *src = desc;
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char *dst = server_info.desc;
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for(; *src != '\0' && LEFT(dst) > 0;)
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{
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if(*src == '"')
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{
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if(LEFT(dst) < 2)
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break;
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*dst++ = '\\';
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}
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else if(*src == '\\')
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{
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if(LEFT(dst) < 2)
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break;
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*dst++ = '\\';
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}
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*dst++ = *src++;
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}
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*dst = '\0';
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}
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void vs_master_set_tags(const char *tags)
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{
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server_info.tags = tags; /* This needs more protection, instead of relying on the master server. */
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}
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void vs_master_update(void)
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{
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if(!server_info.enabled || server_info.master == NULL)
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return;
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if(!server_info.started)
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{
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v_timer_start(&server_info.timer);
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v_timer_advance(&server_info.timer, MASTER_SERVER_PERIOD);
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server_info.started = TRUE;
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return;
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}
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if(v_timer_elapsed(&server_info.timer) < MASTER_SERVER_PERIOD)
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return;
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verse_send_ping(server_info.master, "MS:ANNOUNCE");
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v_timer_start(&server_info.timer);
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/* printf("MS:ANNOUNCE sent to %s\n", server_info.master);*/
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}
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/* Check if a description request, of the form "A,B,C,...,D" includes the given keyword. This needs to
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* do more than just a simple strstr(), since the keyword may be a prefix. Shades of OpenGL extensions.
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*/
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static int desc_has_keyword(const char *desc, const char *keyword)
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{
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const char *ptr;
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if(desc == NULL || *desc == '\0') /* Quick-check for empty description. */
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return 0;
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if((ptr = strstr(desc, keyword)) != NULL)
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{
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size_t kl = strlen(keyword);
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return ptr[kl] == ',' || ptr[kl] == '\0';
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}
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return 0;
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}
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static int keyword_fits(size_t used, size_t max, const char *key, const char *value)
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{
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size_t vsize = 0;
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if(key != NULL && value != NULL)
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vsize += 1 + strlen(key) + 1 + 1 + strlen(value) + 1;
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return max - 1 - used >= vsize;
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}
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static char * append_desc(char *buf, const char *key, const char *value)
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{
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return buf + sprintf(buf, " %s=\"%s\"", key, value);
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}
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void vs_master_handle_describe(const char *address, const char *message)
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{
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char desc[1380] = "DESCRIPTION", *put = desc + 11;
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if(desc_has_keyword(message, "DE") && server_info.desc != NULL && keyword_fits(put - desc, sizeof desc, "DE", server_info.desc))
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put = append_desc(put, "DE", server_info.desc);
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if(desc_has_keyword(message, "TA") && server_info.tags != NULL && keyword_fits(put - desc, sizeof desc, "TA", server_info.tags))
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put = append_desc(put, "TA", server_info.tags);
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verse_send_ping(address, desc);
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}
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