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/* dynamic module loader */
#ifndef lint
static const char rcsid[] = "$Id$";
static const char copyright[] =
"Copyright (c) 2008 by Internet Systems Consortium, Inc. (\"ISC\")";
#endif
/*
* Copyright (c) 2008 by Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "asprintf.h"
#include "ncaptool.h"
#include <assert.h>
#include <ctype.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ncap_port.h"
#include "ncaptool_mod.h"
/**
* scan the command-line argument module args and prepare a corresponding
* struct module for loading.
*
* @return 0 on success, nonzero otherwise
*/
int
scan_moddescr (struct module *mod, const char *arg) {
char *tmp, *p;
char *saveptr = NULL;
if (mod == NULL || arg == NULL)
return (-1);
tmp = strdup(arg);
p = strchr(tmp, ',');
if (p != NULL)
mod->args = strdup(p + 1);
else
mod->args = strdup("");
strtok_r(tmp, ",", &saveptr);
mod->path = strdup(tmp);
free(tmp);
return (0);
}
/**
* load the DSO specified by the filesystem path mod->path
*
* @return 0 on success, nonzero otherwise
*/
int
module_load (struct module *mod) {
const char *error;
if (mod == NULL)
return (-1);
if (isalnum((unsigned char) mod->path[0])) {
char *tmp;
ncap_asprintf(&tmp, "./%s", mod->path);
assert(tmp != NULL);
free(mod->path);
mod->path = tmp;
}
mod->dlhandle = dlopen(mod->path, RTLD_NOW);
if (mod->dlhandle == NULL) {
fprintf(stderr, "module_load: dlopen() failed: %s\n", dlerror());
return (-1);
}
dlerror(); /* clear */
if (mod->type == mt_msg) {
mod->ctx.msg = dlsym(mod->dlhandle, "ncaptool_msgmod_ctx");
if (mod->ctx.msg->mver != NCAPTOOL_MSGMOD_VERSION) {
fprintf(stderr, "module_load: wrong message module interface version "
"%d != %d\n", mod->ctx.msg->mver, NCAPTOOL_MSGMOD_VERSION);
return (-1);
}
} else {
fprintf(stderr, "module_load: unsupported module type %d\n", mod->type);
return (-1);
}
if ((error = dlerror()) != NULL) {
fprintf(stderr, "module_load: dlsym() failed: %s\n", error);
return (-1);
}
return (0);
}
/**
* initialize the loaded module
* @return 0 on success, nonzero otherwise
*/
int
module_init (struct module *mod, struct ncaptool_ctx *ctx) {
char **argv;
int argc, rc;
if (mod == NULL || mod->ctx.msg == NULL || mod->ctx.msg->init == NULL)
return (-1);
argv = synth_args(mod->ctx.msg->name, mod->args, &argc);
assert(argv != NULL);
reset_getopt();
rc = mod->ctx.msg->init(ctx, argc, argv);
free(argv[0]);
free(argv);
return (rc);
}
/**
* finalize an initialized module
* @return 0 on success, nonzero otherwise
*/
int
module_fini (struct module *mod) {
int rc;
if (mod == NULL || mod->ctx.msg == NULL || mod->ctx.msg->fini == NULL)
return (-1);
rc = mod->ctx.msg->fini();
free(mod->args);
free(mod->path);
if (dlclose(mod->dlhandle) != 0) {
fprintf(stderr, "module_fini: dlclose() failed: %s\n",
dlerror());
return (-1);
}
return (rc);
}
/**
* synthesize an argc / argv vector from a string
* @param name argv[0] content
* @param args argument string (tokenized on spaces)
* @param argc argc parameter-result
* @return argument vector on success, NULL on failure
*/
char **
synth_args (const char *name, const char *args, int *argc) {
char **argv;
char *copy;
if (name == NULL || args == NULL || argc == NULL)
return NULL;
argv = malloc(2 * sizeof(char *));
assert(argv != NULL);
argv[0] = strdup(name);
copy = strdup(args);
argv[1] = copy;
*argc = 2;
while (*copy != '\0') {
if (*copy == ' ') {
*copy++ = '\0';
argv = realloc(argv, ++(*argc) * sizeof(char *));
assert(argv != NULL);
argv[*argc - 1] = copy;
}
copy++;
}
return (argv);
}
/**
* from http://lists.debian.org/debian-glibc/2004/10/msg00086.html
* reset the internal state of getopt()
*/
void
reset_getopt (void) {
#ifdef __GLIBC__
optind = 0;
#else
optind = 1;
#endif
#ifdef HAVE_OPTRESET
optreset = 1; /* Makes BSD getopt happy */
#endif
}
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