+/*
+ */
+#define _POSIX_C_SOURCE 200809L
+#include "stack.h"
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdarg.h>
+
+#include <fcntl.h>
+#include <spawn.h>
+
+#define MAX_ARGS 16
+
+extern char **environ;
+
+// === GLOBALS ===
+pid_t giStack_PID;
+ int giStack_InFD = -1;
+ int giNumStackArgs = 1;
+char *gasStackArgs[MAX_ARGS] = {"nettest",NULL};
+
+// === CODE ===
+void Stack_AddDevice(const char *Ident, const void *MacAddr)
+{
+ Stack_AddArg("-dev");
+ Stack_AddArg("%02x%02x%02x%02x%02x%02x:unix:%s",
+ ((uint8_t*)MacAddr)[0],
+ ((uint8_t*)MacAddr)[1],
+ ((uint8_t*)MacAddr)[2],
+ ((uint8_t*)MacAddr)[3],
+ ((uint8_t*)MacAddr)[4],
+ ((uint8_t*)MacAddr)[5],
+ Ident);
+}
+
+void Stack_AddInterface(const char *Name, int AddrType, const void *Addr, int MaskBits)
+{
+ Stack_AddArg("-ip");
+ switch(AddrType)
+ {
+ case 4:
+ Stack_AddArg("%s,%i.%i.%i.%i/%i", Name,
+ ((uint8_t*)Addr)[0],
+ ((uint8_t*)Addr)[1],
+ ((uint8_t*)Addr)[2],
+ ((uint8_t*)Addr)[3],
+ MaskBits
+ );
+ break;
+ default:
+ assert(AddrType == 4);
+ exit(1);
+ }
+}
+
+void Stack_AddRoute(int Type, const void *Network, int MaskBits, const void *NextHop)
+{
+}
+
+void Stack_AddArg(const char *Fmt, ...)
+{
+ va_list args;
+ va_start(args, Fmt);
+ size_t len = vsnprintf(NULL, 0, Fmt, args);
+ va_end(args);
+ char *arg = malloc(len+1);
+ va_start(args, Fmt);
+ vsnprintf(arg, len+1, Fmt, args);
+ va_end(args);
+ gasStackArgs[giNumStackArgs++] = arg;
+}
+
+void sigchld_handler(int signum)
+{
+ int status;
+ wait(&status);
+ fprintf(stderr, "FAILURE: Child exited (%i)\n", status);
+}
+
+int Stack_Start(const char *Subcommand)
+{
+ Stack_AddArg(Subcommand);
+
+ for( int i = 3; i < 16; i ++ )
+ fcntl(i, F_SETFD, FD_CLOEXEC);
+
+ //signal(SIGCHLD, sigchld_handler);
+
+ int fds_in[2];
+ pipe(fds_in);
+ giStack_InFD = fds_in[1];
+ fcntl(giStack_InFD, F_SETFD, FD_CLOEXEC);
+
+ FILE *fp;
+ fp = fopen("stdout.txt", "a"); fprintf(fp, "--- Startup\n"); fclose(fp);
+ fp = fopen("stderr.txt", "a"); fprintf(fp, "--- Startup\n"); fclose(fp);
+
+ posix_spawn_file_actions_t fa;
+ posix_spawn_file_actions_init(&fa);
+ posix_spawn_file_actions_adddup2(&fa, fds_in[0], 0);
+ posix_spawn_file_actions_addopen(&fa, 1, "stdout.txt", O_CREAT|O_APPEND|O_WRONLY, 0644);
+ posix_spawn_file_actions_addopen(&fa, 2, "stderr.txt", O_CREAT|O_APPEND|O_WRONLY, 0644);
+
+ int rv = posix_spawn(&giStack_PID, "./nettest", &fa, NULL, gasStackArgs, environ);
+ if(rv) {
+ giStack_PID = 0;
+ fprintf(stderr, "posix_spawn failed: %s", strerror(rv));
+ return 1;
+ }
+
+ return 0;
+}
+void Stack_Kill(void)
+{
+ if( giStack_PID )
+ {
+ kill(giStack_PID, SIGTERM);
+ giStack_PID = 0;
+ }
+}
+
+int Stack_SendCommand(const char *CommandString)
+{
+ write(giStack_InFD, CommandString, strlen(CommandString));
+ write(giStack_InFD, "\n", 1);
+ return 0;
+}
+