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625df645b7
iproute2/include/utils.h
Phil Sutter 625df645b7 Check user supplied interface name lengths 
The original problem was that something like:

| strncpy(ifr.ifr_name, *argv, IFNAMSIZ);

might leave ifr.ifr_name unterminated if length of *argv exceeds
IFNAMSIZ. In order to fix this, I thought about replacing all those
cases with (equivalent) calls to snprintf() or even introducing
strlcpy(). But as Ulrich Drepper correctly pointed out when rejecting
the latter from being added to glibc, truncating a string without
notifying the user is not to be considered good practice. So let's
excercise what he suggested and reject empty, overlong or otherwise
invalid interface names right from the start - this way calls to
strncpy() like shown above become safe and the user has a chance to
reconsider what he was trying to do.

Note that this doesn't add calls to check_ifname() to all places where
user supplied interface name is parsed. In many cases, the interface
must exist already and is therefore looked up using ll_name_to_index(),
so if_nametoindex() will perform the necessary checks already.

Signed-off-by: Phil Sutter <phil@nwl.cc>
2017-10-02 08:01:21 -07:00

261 lines
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C
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#ifndef __UTILS_H__
#define __UTILS_H__ 1
#include <sys/types.h>
#include <asm/types.h>
#include <resolv.h>
#include <stdlib.h>
#include <stdbool.h>
#include "libnetlink.h"
#include "ll_map.h"
#include "rtm_map.h"
extern int preferred_family;
extern int human_readable;
extern int use_iec;
extern int show_stats;
extern int show_details;
extern int show_raw;
extern int resolve_hosts;
extern int oneline;
extern int brief;
extern int json;
extern int timestamp;
extern int timestamp_short;
extern const char * _SL_;
extern int max_flush_loops;
extern int batch_mode;
extern bool do_all;
#ifndef CONFDIR
#define CONFDIR "/etc/iproute2"
#endif
#define SPRINT_BSIZE 64
#define SPRINT_BUF(x) char x[SPRINT_BSIZE]
void incomplete_command(void) __attribute__((noreturn));
#define NEXT_ARG() do { argv++; if (--argc <= 0) incomplete_command(); } while(0)
#define NEXT_ARG_OK() (argc - 1 > 0)
#define NEXT_ARG_FWD() do { argv++; argc--; } while(0)
#define PREV_ARG() do { argv--; argc++; } while(0)
typedef struct
{
__u16 flags;
__u16 bytelen;
__s16 bitlen;
/* These next two fields match rtvia */
__u16 family;
__u32 data[64];
} inet_prefix;
#define PREFIXLEN_SPECIFIED 1
#define DN_MAXADDL 20
#ifndef AF_DECnet
#define AF_DECnet 12
#endif
struct dn_naddr
{
unsigned short a_len;
unsigned char a_addr[DN_MAXADDL];
};
#define IPX_NODE_LEN 6
struct ipx_addr {
u_int32_t ipx_net;
u_int8_t ipx_node[IPX_NODE_LEN];
};
#ifndef AF_MPLS
# define AF_MPLS 28
#endif
#ifndef IPPROTO_MPLS
#define IPPROTO_MPLS 137
#endif
__u32 get_addr32(const char *name);
int get_addr_1(inet_prefix *dst, const char *arg, int family);
int get_prefix_1(inet_prefix *dst, char *arg, int family);
int get_addr(inet_prefix *dst, const char *arg, int family);
int get_prefix(inet_prefix *dst, char *arg, int family);
int mask2bits(__u32 netmask);
int get_addr_ila(__u64 *val, const char *arg);
int get_hex(char c);
int get_integer(int *val, const char *arg, int base);
int get_unsigned(unsigned *val, const char *arg, int base);
int get_time_rtt(unsigned *val, const char *arg, int *raw);
#define get_byte get_u8
#define get_ushort get_u16
#define get_short get_s16
int get_u64(__u64 *val, const char *arg, int base);
int get_u32(__u32 *val, const char *arg, int base);
int get_s32(__s32 *val, const char *arg, int base);
int get_u16(__u16 *val, const char *arg, int base);
int get_s16(__s16 *val, const char *arg, int base);
int get_u8(__u8 *val, const char *arg, int base);
int get_s8(__s8 *val, const char *arg, int base);
int get_be64(__be64 *val, const char *arg, int base);
int get_be32(__be32 *val, const char *arg, int base);
int get_be16(__be16 *val, const char *arg, int base);
int get_addr64(__u64 *ap, const char *cp);
int hex2mem(const char *buf, uint8_t *mem, int count);
char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen);
__u8 *hexstring_a2n(const char *str, __u8 *buf, int blen, unsigned int *len);
#define ADDR64_BUF_SIZE sizeof("xxxx:xxxx:xxxx:xxxx")
int addr64_n2a(__u64 addr, char *buff, size_t len);
int af_bit_len(int af);
int af_byte_len(int af);
const char *format_host_r(int af, int len, const void *addr,
char *buf, int buflen);
const char *format_host(int af, int lne, const void *addr);
#define format_host_rta(af, rta) \
format_host(af, RTA_PAYLOAD(rta), RTA_DATA(rta))
const char *rt_addr_n2a_r(int af, int len, const void *addr,
char *buf, int buflen);
const char *rt_addr_n2a(int af, int len, const void *addr);
#define rt_addr_n2a_rta(af, rta) \
rt_addr_n2a(af, RTA_PAYLOAD(rta), RTA_DATA(rta))
int read_family(const char *name);
const char *family_name(int family);
void missarg(const char *) __attribute__((noreturn));
void invarg(const char *, const char *) __attribute__((noreturn));
void duparg(const char *, const char *) __attribute__((noreturn));
void duparg2(const char *, const char *) __attribute__((noreturn));
int check_ifname(const char *);
int get_ifname(char *, const char *);
int matches(const char *arg, const char *pattern);
int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits);
const char *dnet_ntop(int af, const void *addr, char *str, size_t len);
int dnet_pton(int af, const char *src, void *addr);
const char *ipx_ntop(int af, const void *addr, char *str, size_t len);
int ipx_pton(int af, const char *src, void *addr);
const char *mpls_ntop(int af, const void *addr, char *str, size_t len);
int mpls_pton(int af, const char *src, void *addr, size_t alen);
extern int __iproute2_hz_internal;
int __get_hz(void);
static __inline__ int get_hz(void)
{
if (__iproute2_hz_internal == 0)
__iproute2_hz_internal = __get_hz();
return __iproute2_hz_internal;
}
extern int __iproute2_user_hz_internal;
int __get_user_hz(void);
static __inline__ int get_user_hz(void)
{
if (__iproute2_user_hz_internal == 0)
__iproute2_user_hz_internal = __get_user_hz();
return __iproute2_user_hz_internal;
}
static inline __u32 nl_mgrp(__u32 group)
{
if (group > 31 ) {
fprintf(stderr, "Use setsockopt for this group %d\n", group);
exit(-1);
}
return group ? (1 << (group - 1)) : 0;
}
/* courtesy of bridge-utils */
static inline unsigned long __tv_to_jiffies(const struct timeval *tv)
{
unsigned long long jif;
jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
return jif/10000;
}
static inline void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
{
unsigned long long tvusec;
tvusec = 10000ULL*jiffies;
tv->tv_sec = tvusec/1000000;
tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
}
int print_timestamp(FILE *fp);
void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);
#define BIT(nr) (1UL << (nr))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
#ifndef offsetof
# define offsetof(type, member) ((size_t) &((type *)0)->member)
#endif
#ifndef min
# define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
#endif
#ifndef __check_format_string
# define __check_format_string(pos_str, pos_args) \
__attribute__ ((format (printf, (pos_str), (pos_args))))
#endif
#define _textify(x) #x
#define textify(x) _textify(x)
#define htonll(x) ((1==htonl(1)) ? (x) : ((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
#define ntohll(x) ((1==ntohl(1)) ? (x) : ((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
extern int cmdlineno;
ssize_t getcmdline(char **line, size_t *len, FILE *in);
int makeargs(char *line, char *argv[], int maxargs);
int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6);
struct iplink_req {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
};
int iplink_parse(int argc, char **argv, struct iplink_req *req,
char **name, char **type, char **link, char **dev,
int *group, int *index);
int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
bool show_label);
char *int_to_str(int val, char *buf);
int get_guid(__u64 *guid, const char *arg);
int get_real_family(int rtm_type, int rtm_family);
int cmd_exec(const char *cmd, char **argv, bool do_fork);
int make_path(const char *path, mode_t mode);
char *find_cgroup2_mount(void);
int get_command_name(const char *pid, char *comm, size_t len);
size_t strlcpy(char *dst, const char *src, size_t size);
size_t strlcat(char *dst, const char *src, size_t size);
#endif /* __UTILS_H__ */
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