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/*
* ext.c - Communication infrastructure for the external interface
*
* Written 2001,2002 by Werner Almesberger
* Copyright 2001,2002 Network Robots
* Copyright 2002 Werner Almesberger
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <linux/if_ether.h>
#include "config.h"
#include "util.h"
#include "error.h"
#include "tree.h"
#include "tc.h"
#include "ext.h"
static int debug_target = 0;
static void make_argv0(char **argv,const char *name)
{
argv[0] = alloc_sprintf("tcc-ext-%s",name);
}
static void make_unique(char **argv)
{
static char unique[5];
static int count = 0;
if (count == 0x100) error("too many calls to external interface");
sprintf(unique,"%02x%02x",getpid() & 0xff,count & 0xff);
count++;
argv[2] = unique;
}
void ext_config(const char *name)
{
char *argv[] = { NULL, "config", NULL };
FILE *file;
char line[MAX_EXT_LINE+2];
make_argv0(argv,name);
file = ext_open(argv,name);
free(argv[0]);
ext_read(name,"on configuration query");
while (fgets(line,MAX_EXT_LINE+2,file)) {
char *nl;
nl = strchr(line,'\n');
if (nl) *nl = 0;
if (debug) fprintf(stderr,"config %s> %s\n",name,line);
if (!strcmp(line,"all")) dump_all = 1;
else if (!strcmp(line,"fifos")) add_fifos = 1;
else if (!strcmp(line,"nounspec")) generate_default_class = 1;
else if (!strcmp(line,"nocontinue")); /* ignore */
else if (!strcmp(line,"debug_target")) debug_target = 1;
else if (!strcmp(line,"nocombine")) no_combine = 1;
else errorf("unrecognized configuration item \"%s\"",line);
}
ext_close();
}
void ext_build(const char *name,const QDISC *qdisc,const FILTER *filter,
void (*dump_config)(FILE *file,void *user),void *user)
{
char *argv[] = { NULL, "build", NULL, NULL };
FILE *file;
int got_element;
char line[MAX_EXT_LINE+2];
make_argv0(argv,name);
make_unique(argv);
file = ext_open(argv,name);
free(argv[0]);
dump_config(file,user);
ext_read(name,"when building");
got_element = 0;
while (fgets(line,MAX_EXT_LINE+2,file)) {
char *nl,*element;
int pos;
nl = strchr(line,'\n');
if (nl) *nl = 0;
if (debug) fprintf(stderr,"build %s> %s\n",name,line);
if (sscanf(line,"qdisc %as%n",&element,&pos) >= 1) {
if (!qdisc) errorf("did not expect a qdisc from \"%s\"",name);
if (got_element)
errorf("already got an element from \"%s\"",name);
printf("insmod sch_%s.o\n",element);
__tc_qdisc_add(qdisc,element);
tc_more("%s\n",line+pos);
free(element);
got_element = 1;
}
else if (sscanf(line,"filter %as%n",&element,&pos) >= 1) {
if (!filter) errorf("did not expect a filter from \"%s\"",name);
if (got_element)
errorf("already got an element from \"%s\"",name);
printf("insmod cls_%s.o\n",element);
__tc_filter_add(filter,ETH_P_ALL);
tc_more(" %s%s\n",element,line+pos);
free(element);
got_element = 1;
}
else errorf("unrecognized build response \"%s\"",line);
}
ext_close();
if (!got_element && !dump_all && !debug_target)
errorf("\"%s\" did not generate any element",name);
}
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