static int if_module_pppd_run(int rd, int wr, void *userdata)
{
struct pppd_ctx *ctx = userdata;
const char *pppd = ctx->pc_pppd;
const char *ip = ctx->pc_ip;
pid_t pid;
int rc;
pid = fork();
PPPOAT_ASSERT(pid >= 0);
if (pid == 0) {
rc = dup2(rd, 0);
PPPOAT_ASSERT(rc >= 0);
rc = dup2(wr, 1);
PPPOAT_ASSERT(rc >= 0);
close(rd);
close(wr);
/* XXX opposite sides of the pipes are not closed */
pppoat_debug("pppd", "%s nodetach noauth notty passive %s",
pppd, ip == NULL ? "" : ip);
execl(pppd, pppd, "nodetach", "noauth",
"notty", "passive", ip, NULL);
pppoat_error("main", "execl() should never return");
exit(1);
}
ctx->pc_pid = pid;
return 0;
}
int main(int argc, char **argv)
{
const struct pppoat_module *m;
const struct pppoat_if_module *im;
void *m_data;
void *im_data;
int rd[2];
int wr[2];
int rc;
pppoat_log_init(PPPOAT_DEBUG);
if (argc > 1 && strcmp(argv[1], "--help") == 0) {
help_print(stdout, argv[0]);
exit(0);
}
if (argc > 1 && strcmp(argv[1], "--list") == 0) {
module_list_print(stdout);
exit(0);
}
im = if_module_tbl[0];
PPPOAT_ASSERT(im != NULL);
m = module_find("udp");
PPPOAT_ASSERT(m != NULL);
/* init modules */
rc = im->im_init(argc, argv, &im_data);
PPPOAT_ASSERT_INFO(rc == 0, "rc=%d", rc);
rc = m->m_init(argc, argv, &m_data);
PPPOAT_ASSERT_INFO(rc == 0, "rc=%d", rc);
/* create pipes for communication with pppd */
rc = pipe(rd);
PPPOAT_ASSERT(rc == 0);
rc = pipe(wr);
PPPOAT_ASSERT(rc == 0);
/* exec pppd */
rc = im->im_run(wr[0], rd[1], im_data);
PPPOAT_ASSERT_INFO(rc == 0, "rc=%d", rc);
close(rd[1]);
close(wr[0]);
/* run appropriate module's function */
rc = m->m_run(rd[0], wr[1], 0 /* XXX */, m_data);
pppoat_error("main", "rc=%d", rc);
/* finalisation */
im->im_stop(im_data);
im->im_fini(im_data);
m->m_fini(m_data);
close(rd[0]);
close(wr[1]);
pppoat_log_fini();
return 0;
}
static int if_module_pppd_stop(void *userdata)
{
struct pppd_ctx *ctx = userdata;
pid_t pid;
int rc;
rc = kill(ctx->pc_pid, SIGTERM);
PPPOAT_ASSERT(rc == 0);
do {
pid = waitpid(ctx->pc_pid, NULL, 0);
} while (pid < 0 && errno == EINTR);
PPPOAT_ASSERT(pid > 0);
return 0;
}
