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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
*/
/**
* @defgroup cli Command Line Interface API
*
* @{
*
* These modules provide an interface for text based applications. The
* functions provided are wrappers for their libnl equivalent with
* added error handling. The functions check for allocation failures,
* invalid input, and unknown types and will print error messages
* accordingly via nl_cli_fatal().
*/
#include <netlink/cli/utils.h>
#include <locale.h>
#include "lib/defs.h"
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
/**
* Parse a text based 32 bit unsigned integer argument
* @arg arg Integer in text form.
*
* Tries to convert the number provided in arg to a uint32_t. Will call
* nl_cli_fatal() if the conversion fails.
*
* @return 32bit unsigned integer.
*/
uint32_t nl_cli_parse_u32(const char *arg)
{
unsigned long lval;
char *endptr;
lval = strtoul(arg, &endptr, 0);
if (endptr == arg || lval == ULONG_MAX)
nl_cli_fatal(EINVAL, "Unable to parse \"%s\", not a number.",
arg);
return (uint32_t) lval;
}
void nl_cli_print_version(void)
{
printf("libnl tools version %s\n", LIBNL_VERSION);
printf(
"Copyright (C) 2003-2010 Thomas Graf <tgraf@redhat.com>\n"
"\n"
"This program comes with ABSOLUTELY NO WARRANTY. This is free \n"
"software, and you are welcome to redistribute it under certain\n"
"conditions. See the GNU General Public License for details.\n"
);
exit(0);
}
/**
* Print error message and quit application
* @arg err Error code.
* @arg fmt Error message.
*
* Prints the formatted error message to stderr and quits the application
* using the provided error code.
*/
void nl_cli_fatal(int err, const char *fmt, ...)
{
va_list ap;
fprintf(stderr, "Error: ");
if (fmt) {
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
} else {
char *buf;
#ifdef HAVE_STRERROR_L
locale_t loc = newlocale(LC_MESSAGES_MASK, "", (locale_t)0);
if (loc == (locale_t)0) {
if (errno == ENOENT)
loc = newlocale(LC_MESSAGES_MASK,
"POSIX", (locale_t)0);
if (loc == (locale_t)0)
buf = "newlocale() failed";
}
if (loc != (locale_t)0)
buf = strerror_l(err, loc);
#else
buf = strerror(err);
#endif
fprintf(stderr, "%s\n", buf);
#ifdef HAVE_STRERROR_L
if (loc != (locale_t)0)
freelocale(loc);
#endif
}
exit(abs(err));
}
int nl_cli_connect(struct nl_sock *sk, int protocol)
{
int err;
if ((err = nl_connect(sk, protocol)) < 0)
nl_cli_fatal(err, "Unable to connect netlink socket: %s",
nl_geterror(err));
return err;
}
struct nl_sock *nl_cli_alloc_socket(void)
{
struct nl_sock *sock;
if (!(sock = nl_socket_alloc()))
nl_cli_fatal(ENOBUFS, "Unable to allocate netlink socket");
return sock;
}
struct nl_addr *nl_cli_addr_parse(const char *str, int family)
{
struct nl_addr *addr;
int err;
if ((err = nl_addr_parse(str, family, &addr)) < 0)
nl_cli_fatal(err, "Unable to parse address \"%s\": %s",
str, nl_geterror(err));
return addr;
}
int nl_cli_parse_dumptype(const char *str)
{
if (!strcasecmp(str, "brief"))
return NL_DUMP_LINE;
else if (!strcasecmp(str, "details") || !strcasecmp(str, "detailed"))
return NL_DUMP_DETAILS;
else if (!strcasecmp(str, "stats"))
return NL_DUMP_STATS;
else
nl_cli_fatal(EINVAL, "Invalid dump type \"%s\".\n", str);
return 0;
}
int nl_cli_confirm(struct nl_object *obj, struct nl_dump_params *params,
int default_yes)
{
nl_object_dump(obj, params);
for (;;) {
char buf[32] = { 0 };
int answer;
printf("Delete? (%c/%c) ",
default_yes ? 'Y' : 'y',
default_yes ? 'n' : 'N');
if (!fgets(buf, sizeof(buf), stdin)) {
fprintf(stderr, "Error while reading\n.");
continue;
}
switch ((answer = tolower(buf[0]))) {
case '\n':
answer = default_yes ? 'y' : 'n';
/* fall through */
case 'y':
case 'n':
return answer == 'y';
}
fprintf(stderr, "Invalid input, try again.\n");
}
return 0;
}
struct nl_cache *nl_cli_alloc_cache(struct nl_sock *sock, const char *name,
int (*ac)(struct nl_sock *, struct nl_cache **))
{
struct nl_cache *cache;
int err;
if ((err = ac(sock, &cache)) < 0)
nl_cli_fatal(err, "Unable to allocate %s cache: %s",
name, nl_geterror(err));
nl_cache_mngt_provide(cache);
return cache;
}
struct nl_cache *nl_cli_alloc_cache_flags(struct nl_sock *sock,
const char *name, unsigned int flags,
int (*ac)(struct nl_sock *, struct nl_cache **,
unsigned int))
{
struct nl_cache *cache;
int err;
if ((err = ac(sock, &cache, flags)) < 0)
nl_cli_fatal(err, "Unable to allocate %s cache: %s",
name, nl_geterror(err));
nl_cache_mngt_provide(cache);
return cache;
}
void nl_cli_load_module(const char *prefix, const char *name)
{
char path[FILENAME_MAX+1];
snprintf(path, sizeof(path), "%s/%s/%s.so",
PKGLIBDIR, prefix, name);
#ifdef HAVE_DLFCN_H
{
void *handle;
handle = dlopen(path, RTLD_NOW);
if (!handle) {
nl_cli_fatal(ENOENT, "Unable to load module \"%s\": %s\n",
path, dlerror());
}
/* We intentionally leak the dlopen handle. */
/* coverity[RESOURCE_LEAK] */
}
#else
nl_cli_fatal(ENOTSUP, "Unable to load module \"%s\": built without dynamic libraries support\n",
path);
#endif
}
/** @} */
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