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socat/sysutils.c
Gerhard Rieger df493f126e replaced RCS ID's by source file names
2008-01-28 22:37:16 +01:00

496 lines
15 KiB
C
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/* source: sysutils.c */
/* Copyright Gerhard Rieger 2001-2007 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* translate socket addresses into human readable form */
#include "config.h"
#include "xioconfig.h"
#include "sysincludes.h"
#include "compat.h" /* socklen_t */
#include "mytypes.h"
#include "error.h"
#include "sycls.h"
#include "utils.h"
#include "sysutils.h"
#if WITH_UNIX
void socket_un_init(struct sockaddr_un *sa) {
#if HAVE_STRUCT_SOCKADDR_SALEN
sa->sun_len = sizeof(struct sockaddr_un);
#endif
sa->sun_family = AF_UNIX;
memset(sa->sun_path, '\0', sizeof(sa->sun_path));
}
#endif /* WITH_UNIX */
#if WITH_IP4
void socket_in_init(struct sockaddr_in *sa) {
#if HAVE_STRUCT_SOCKADDR_SALEN
sa->sin_len = sizeof(struct sockaddr_in);
#endif
sa->sin_family = AF_INET;
sa->sin_port = 0;
sa->sin_addr.s_addr = 0;
sa->sin_zero[0] = 0;
sa->sin_zero[1] = 0;
sa->sin_zero[2] = 0;
sa->sin_zero[3] = 0;
sa->sin_zero[4] = 0;
sa->sin_zero[5] = 0;
sa->sin_zero[6] = 0;
sa->sin_zero[7] = 0;
}
#endif /* WITH_IP4 */
#if WITH_IP6
void socket_in6_init(struct sockaddr_in6 *sa) {
#if HAVE_STRUCT_SOCKADDR_SALEN
sa->sin6_len = sizeof(struct sockaddr_in6);
#endif
sa->sin6_family = AF_INET6;
sa->sin6_port = 0;
sa->sin6_flowinfo = 0;
#if HAVE_IP6_SOCKADDR==0
sa->sin6_addr.s6_addr[0] = 0;
sa->sin6_addr.s6_addr[1] = 0;
sa->sin6_addr.s6_addr[2] = 0;
sa->sin6_addr.s6_addr[3] = 0;
sa->sin6_addr.s6_addr[4] = 0;
sa->sin6_addr.s6_addr[5] = 0;
sa->sin6_addr.s6_addr[6] = 0;
sa->sin6_addr.s6_addr[7] = 0;
sa->sin6_addr.s6_addr[8] = 0;
sa->sin6_addr.s6_addr[9] = 0;
sa->sin6_addr.s6_addr[10] = 0;
sa->sin6_addr.s6_addr[11] = 0;
sa->sin6_addr.s6_addr[12] = 0;
sa->sin6_addr.s6_addr[13] = 0;
sa->sin6_addr.s6_addr[14] = 0;
sa->sin6_addr.s6_addr[15] = 0;
#elif HAVE_IP6_SOCKADDR==1
sa->sin6_addr.u6_addr.u6_addr32[0] = 0;
sa->sin6_addr.u6_addr.u6_addr32[1] = 0;
sa->sin6_addr.u6_addr.u6_addr32[2] = 0;
sa->sin6_addr.u6_addr.u6_addr32[3] = 0;
#elif HAVE_IP6_SOCKADDR==2
sa->sin6_addr.u6_addr32[0] = 0;
sa->sin6_addr.u6_addr32[1] = 0;
sa->sin6_addr.u6_addr32[2] = 0;
sa->sin6_addr.u6_addr32[3] = 0;
#elif HAVE_IP6_SOCKADDR==3
sa->sin6_addr.in6_u.u6_addr32[0] = 0;
sa->sin6_addr.in6_u.u6_addr32[1] = 0;
sa->sin6_addr.in6_u.u6_addr32[2] = 0;
sa->sin6_addr.in6_u.u6_addr32[3] = 0;
#elif HAVE_IP6_SOCKADDR==4
sa->sin6_addr._S6_un._S6_u32[0] = 0;
sa->sin6_addr._S6_un._S6_u32[1] = 0;
sa->sin6_addr._S6_un._S6_u32[2] = 0;
sa->sin6_addr._S6_un._S6_u32[3] = 0;
#elif HAVE_IP6_SOCKADDR==5
sa->sin6_addr.__u6_addr.__u6_addr32[0] = 0;
sa->sin6_addr.__u6_addr.__u6_addr32[1] = 0;
sa->sin6_addr.__u6_addr.__u6_addr32[2] = 0;
sa->sin6_addr.__u6_addr.__u6_addr32[3] = 0;
#endif
}
#endif /* WITH_IP6 */
#if _WITH_SOCKET
/* initializes the socket address of the specified address family. Returns the
length of the specific socket address, or 0 on error. */
socklen_t socket_init(int af, union sockaddr_union *sa) {
switch (af) {
#if WITH_UNIX
case AF_UNIX: socket_un_init(&sa->un); return sizeof(sa->un);
#endif
#if WITH_IP4
case AF_INET: socket_in_init(&sa->ip4); return sizeof(sa->ip4);
#endif
#if WITH_IP6
case AF_INET6: socket_in6_init(&sa->ip6); return sizeof(sa->ip6);
#endif
default: Error1("socket_init(): unknown address family %d", af);
memset(sa, 0, sizeof(union sockaddr_union));
sa->soa.sa_family = af;
return 0;
}
}
#endif /* _WITH_SOCKET */
#if WITH_UNIX
#define XIOUNIXSOCKOVERHEAD (sizeof(struct sockaddr_un)-sizeof(((struct sockaddr_un*)0)->sun_path))
#endif
#if _WITH_SOCKET
char *sockaddr_info(const struct sockaddr *sa, socklen_t salen, char *buff, size_t blen) {
char ubuff[5*UNIX_PATH_MAX+3];
char *lbuff = buff;
char *cp = lbuff;
int n;
if ((n = snprintf(cp, blen, "AF=%d ", sa->sa_family)) < 0) {
Warn1("sockaddr_info(): buffer too short ("F_Zu")", blen);
*buff = '\0';
return buff;
}
cp += n, blen -= n;
switch (sa->sa_family) {
#if WITH_UNIX
case 0:
case AF_UNIX:
#if WITH_ABSTRACT_UNIXSOCKET
if (salen > XIOUNIXSOCKOVERHEAD &&
sa->sa_data[0] == '\0') {
char *nextc;
// nextc =
// sanitize_string((char *)&sa->sa_data+1, salen-XIOUNIXSOCKOVERHEAD-1,
// ubuff, XIOSAN_DEFAULT_BACKSLASH_OCT_3);
nextc =
sanitize_string((char *)&sa->sa_data, salen-XIOUNIXSOCKOVERHEAD,
ubuff, XIOSAN_DEFAULT_BACKSLASH_OCT_3);
*nextc = '\0';
// snprintf(cp, blen, "\"\\0%s\"", ubuff);
snprintf(cp, blen, "\"%s\"", ubuff);
} else
#endif /* WITH_ABSTRACT_UNIXSOCKET */
{
char *nextc;
nextc =
sanitize_string((char *)&sa->sa_data,
MIN(UNIX_PATH_MAX, strlen((char *)&sa->sa_data)),
ubuff, XIOSAN_DEFAULT_BACKSLASH_OCT_3);
*nextc = '\0';
snprintf(cp, blen, "\"%s\"", ubuff);
}
break;
#endif
#if WITH_IP4
case AF_INET: sockaddr_inet4_info((struct sockaddr_in *)sa, cp, blen);
break;
#endif
#if WITH_IP6
case AF_INET6: sockaddr_inet6_info((struct sockaddr_in6 *)sa, cp, blen);
break;
#endif
default:
if ((snprintf(cp, blen,
"0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
sa->sa_data[0], sa->sa_data[1], sa->sa_data[2],
sa->sa_data[3], sa->sa_data[4], sa->sa_data[5],
sa->sa_data[6], sa->sa_data[7], sa->sa_data[8],
sa->sa_data[9], sa->sa_data[10], sa->sa_data[11],
sa->sa_data[12], sa->sa_data[13])) < 0) {
Warn("sockaddr_info(): buffer too short");
*buff = '\0';
return buff;
}
}
return lbuff;
}
#endif /* _WITH_SOCKET */
#if WITH_UNIX
char *sockaddr_unix_info(const struct sockaddr_un *sa, socklen_t salen, char *buff, size_t blen) {
blen = Min(blen, sizeof(sa->sun_path));
strncpy(buff, sa->sun_path, blen);
if (strlen(buff) >= blen) {
buff[blen-1] = '\0';
}
return buff;
}
#endif /* WITH_UNIX */
#if WITH_IP4
/* addr in host byte order! */
char *inet4addr_info(uint32_t addr, char *buff, size_t blen) {
if (snprintf(buff, blen, "%u.%u.%u.%u",
(unsigned int)(addr >> 24), (unsigned int)((addr >> 16) & 0xff),
(unsigned int)((addr >> 8) & 0xff), (unsigned int)(addr & 0xff)) < 0) {
Warn("inet4addr_info(): buffer too short");
buff[blen-1] = '\0';
}
return buff;
}
#endif /* WITH_IP4 */
#if WITH_IP4
char *sockaddr_inet4_info(const struct sockaddr_in *sa, char *buff, size_t blen) {
if (snprintf(buff, blen, "%u.%u.%u.%u:%hu",
((unsigned char *)&sa->sin_addr.s_addr)[0],
((unsigned char *)&sa->sin_addr.s_addr)[1],
((unsigned char *)&sa->sin_addr.s_addr)[2],
((unsigned char *)&sa->sin_addr.s_addr)[3],
htons(sa->sin_port)) < 0) {
Warn("sockaddr_inet4_info(): buffer too short");
buff[blen-1] = '\0';
}
return buff;
}
#endif /* WITH_IP4 */
#if !HAVE_INET_NTOP
/* http://www.opengroup.org/onlinepubs/000095399/functions/inet_ntop.html */
const char *inet_ntop(int pf, const void *binaddr,
char *addrtext, socklen_t textlen) {
size_t retlen;
switch (pf) {
case PF_INET:
if ((retlen =
snprintf(addrtext, textlen, "%u.%u.%u.%u",
((unsigned char *)binaddr)[0],
((unsigned char *)binaddr)[1],
((unsigned char *)binaddr)[2],
((unsigned char *)binaddr)[3]))
< 0) {
return NULL; /* errno is valid */
}
break;
case PF_INET6:
if ((retlen =
snprintf(addrtext, textlen, "%x:%x:%x:%x:%x:%x:%x:%x",
ntohs(((uint16_t *)binaddr)[0]),
ntohs(((uint16_t *)binaddr)[1]),
ntohs(((uint16_t *)binaddr)[2]),
ntohs(((uint16_t *)binaddr)[3]),
ntohs(((uint16_t *)binaddr)[4]),
ntohs(((uint16_t *)binaddr)[5]),
ntohs(((uint16_t *)binaddr)[6]),
ntohs(((uint16_t *)binaddr)[7])
))
< 0) {
return NULL; /* errno is valid */
}
break;
default:
errno = EAFNOSUPPORT;
return NULL;
}
addrtext[retlen] = '\0';
return addrtext;
}
#endif /* !HAVE_INET_NTOP */
#if WITH_IP6
/* convert the IP6 socket address to human readable form. buff should be at
least 50 chars long */
char *sockaddr_inet6_info(const struct sockaddr_in6 *sa, char *buff, size_t blen) {
if (snprintf(buff, blen, "[%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]:%hu",
#if HAVE_IP6_SOCKADDR==0
(sa->sin6_addr.s6_addr[0]<<8)+
sa->sin6_addr.s6_addr[1],
(sa->sin6_addr.s6_addr[2]<<8)+
sa->sin6_addr.s6_addr[3],
(sa->sin6_addr.s6_addr[4]<<8)+
sa->sin6_addr.s6_addr[5],
(sa->sin6_addr.s6_addr[6]<<8)+
sa->sin6_addr.s6_addr[7],
(sa->sin6_addr.s6_addr[8]<<8)+
sa->sin6_addr.s6_addr[9],
(sa->sin6_addr.s6_addr[10]<<8)+
sa->sin6_addr.s6_addr[11],
(sa->sin6_addr.s6_addr[12]<<8)+
sa->sin6_addr.s6_addr[13],
(sa->sin6_addr.s6_addr[14]<<8)+
sa->sin6_addr.s6_addr[15],
#elif HAVE_IP6_SOCKADDR==1
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[0]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[1]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[2]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[3]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[4]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[5]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[6]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr.u6_addr16)[7]),
#elif HAVE_IP6_SOCKADDR==2
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[0]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[1]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[2]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[3]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[4]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[5]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[6]),
ntohs(((unsigned short *)&sa->sin6_addr.u6_addr16)[7]),
#elif HAVE_IP6_SOCKADDR==3
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[0]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[1]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[2]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[3]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[4]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[5]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[6]),
ntohs(((unsigned short *)&sa->sin6_addr.in6_u.u6_addr16)[7]),
#elif HAVE_IP6_SOCKADDR==4
(sa->sin6_addr._S6_un._S6_u8[0]<<8)|(sa->sin6_addr._S6_un._S6_u8[1]&0xff),
(sa->sin6_addr._S6_un._S6_u8[2]<<8)|(sa->sin6_addr._S6_un._S6_u8[3]&0xff),
(sa->sin6_addr._S6_un._S6_u8[4]<<8)|(sa->sin6_addr._S6_un._S6_u8[5]&0xff),
(sa->sin6_addr._S6_un._S6_u8[6]<<8)|(sa->sin6_addr._S6_un._S6_u8[7]&0xff),
(sa->sin6_addr._S6_un._S6_u8[8]<<8)|(sa->sin6_addr._S6_un._S6_u8[9]&0xff),
(sa->sin6_addr._S6_un._S6_u8[10]<<8)|(sa->sin6_addr._S6_un._S6_u8[11]&0xff),
(sa->sin6_addr._S6_un._S6_u8[12]<<8)|(sa->sin6_addr._S6_un._S6_u8[13]&0xff),
(sa->sin6_addr._S6_un._S6_u8[14]<<8)|(sa->sin6_addr._S6_un._S6_u8[15]&0xff),
#elif HAVE_IP6_SOCKADDR==5
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[0]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[1]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[2]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[3]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[4]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[5]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[6]),
ntohs(((unsigned short *)&sa->sin6_addr.__u6_addr.__u6_addr16)[7]),
#endif
ntohs(sa->sin6_port)) < 0) {
Warn("sockaddr_inet6_info(): buffer too short");
buff[blen-1] = '\0';
}
return buff;
}
#endif /* WITH_IP6 */
/* fill the list with the supplementary group ids of user.
caller passes size of list in ngroups, function returns number of groups in
ngroups.
function returns 0 if 0 or more groups were found, or 1 if the list is too
short. */
int getusergroups(const char *user, gid_t *list, size_t *ngroups) {
struct group *grp;
size_t i = 0;
setgrent();
while (grp = getgrent()) {
char **gusr = grp->gr_mem;
while (*gusr) {
if (!strcmp(*gusr, user)) {
if (i == *ngroups)
return 1;
list[i++] = grp->gr_gid;
break;
}
++gusr;
}
}
endgrent();
*ngroups = i;
return 0;
}
#if !HAVE_HSTRERROR
const char *hstrerror(int err) {
static const char *h_messages[] = {
"success",
"authoritative answer not found",
"non-authoritative, host not found, or serverfail",
"Host name lookup failure", /* "non recoverable error" */
"valid name, no data record of requested type" };
assert(HOST_NOT_FOUND==1);
assert(TRY_AGAIN==2);
assert(NO_RECOVERY==3);
assert(NO_DATA==4);
if ((err < 0) || err > sizeof(h_messages)/sizeof(const char *)) {
return "";
}
return h_messages[err];
}
#endif /* !HAVE_HSTRERROR */
#if WITH_TCP || WITH_UDP
/* returns port in network byte order */
int parseport(const char *portname, int ipproto) {
struct servent *se;
char *extra;
int result;
if (isdigit(portname[0]&0xff)) {
result = htons(strtoul(portname, &extra, 0));
if (*extra != '\0') {
Error3("parseport(\"%s\", %d): extra trailing data \"%s\"",
portname, ipproto, extra);
}
return result;
}
if ((se = getservbyname(portname, ipproto==IPPROTO_TCP?"tcp":"udp")) == NULL) {
Error2("cannot resolve service \"%s/%d\"", portname, ipproto);
return 0;
}
return se->s_port;
}
#endif /* WITH_TCP || WITH_UDP */
#if WITH_IP4 || WITH_IP6
/* check the systems interfaces for ifname and return its index
or -1 if no interface with this name was found */
int ifindexbyname(const char *ifname) {
/* Linux: man 7 netdevice */
/* FreeBSD: man 4 networking */
/* Solaris: man 7 if_tcp */
#if defined(HAVE_STRUCT_IFREQ) && defined(SIOCGIFCONF) && defined(SIOCGIFINDEX)
/* currently we support Linux, FreeBSD; not Solaris */
#define IFBUFSIZ 1024
int s;
struct ifreq ifr;
if (ifname[0] == '\0') {
return -1;
}
if ((s = Socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)) < 0) {
Error1("socket(PF_INET, SOCK_DGRAM, IPPROTO_IP): %s", strerror(errno));
return -1;
}
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (Ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
Close(s);
Info3("ioctl(%d, SIOCGIFINDEX, {%s}): %s",
s, ifr.ifr_name, strerror(errno));
return -1;
}
Close(s);
#if HAVE_STRUCT_IFREQ_IFR_INDEX
return ifr.ifr_index;
#elif HAVE_STRUCT_IFREQ_IFR_IFINDEX
return ifr.ifr_ifindex;
#endif /* HAVE_STRUCT_IFREQ_IFR_IFINDEX */
#else /* !defined(HAVE_ STRUCT_IFREQ) && defined(SIOCGIFCONF) && defined(SIOCGIFINDEX) */
return -1;
#endif /* !defined(HAVE_ STRUCT_IFREQ) && defined(SIOCGIFCONF) && defined(SIOCGIFINDEX) */
}
/* like ifindexbyname(), but allows an index number as input.
writes the resulting index to *ifindex and returns 0,
or returns -1 on error */
int ifindex(const char *ifname, unsigned int *ifindex) {
char *endptr;
long int val;
if (ifname[0] == '\0') {
return -1;
}
val = strtol(ifname, &endptr, 0);
if (endptr[0] == '\0') {
*ifindex = val;
return 0;
}
if ((val = ifindexbyname(ifname)) < 0) {
return -1;
}
*ifindex = val;
return 0;
}
#endif /* WITH_IP4 || WITH_IP6 */
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