/* vi: set sw=4 ts=4: */ /* * utils.c * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * Changes: * * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses */ #include "libbb.h" #include <string.h> #include <unistd.h> #include "utils.h" #include "inet_common.h" int get_integer(int *val, char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN) return -1; *val = res; return 0; } int get_unsigned(unsigned *val, char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > UINT_MAX) return -1; *val = res; return 0; } int get_u32(__u32 * val, char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL) return -1; *val = res; return 0; } int get_u16(__u16 * val, char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > 0xFFFF) return -1; *val = res; return 0; } int get_u8(__u8 * val, char *arg, int base) { unsigned long res; char *ptr; if (!arg || !*arg) return -1; res = strtoul(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > 0xFF) return -1; *val = res; return 0; } int get_s16(__s16 * val, char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000) return -1; *val = res; return 0; } int get_s8(__s8 * val, char *arg, int base) { long res; char *ptr; if (!arg || !*arg) return -1; res = strtol(arg, &ptr, base); if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80) return -1; *val = res; return 0; } int get_addr_1(inet_prefix * addr, char *name, int family) { char *cp; unsigned char *ap = (unsigned char *) addr->data; int i; memset(addr, 0, sizeof(*addr)); if (strcmp(name, bb_INET_default) == 0 || strcmp(name, "all") == 0 || strcmp(name, "any") == 0) { addr->family = family; addr->bytelen = (family == AF_INET6 ? 16 : 4); addr->bitlen = -1; return 0; } if (strchr(name, ':')) { addr->family = AF_INET6; if (family != AF_UNSPEC && family != AF_INET6) return -1; if (inet_pton(AF_INET6, name, addr->data) <= 0) return -1; addr->bytelen = 16; addr->bitlen = -1; return 0; } addr->family = AF_INET; if (family != AF_UNSPEC && family != AF_INET) return -1; addr->bytelen = 4; addr->bitlen = -1; for (cp = name, i = 0; *cp; cp++) { if (*cp <= '9' && *cp >= '0') { ap[i] = 10 * ap[i] + (*cp - '0'); continue; } if (*cp == '.' && ++i <= 3) continue; return -1; } return 0; } int get_prefix_1(inet_prefix * dst, char *arg, int family) { int err; int plen; char *slash; memset(dst, 0, sizeof(*dst)); if (strcmp(arg, bb_INET_default) == 0 || strcmp(arg, "any") == 0) { dst->family = family; dst->bytelen = 0; dst->bitlen = 0; return 0; } slash = strchr(arg, '/'); if (slash) *slash = 0; err = get_addr_1(dst, arg, family); if (err == 0) { switch (dst->family) { case AF_INET6: dst->bitlen = 128; break; default: case AF_INET: dst->bitlen = 32; } if (slash) { if (get_integer(&plen, slash + 1, 0) || plen > dst->bitlen) { err = -1; goto done; } dst->bitlen = plen; } } done: if (slash) *slash = '/'; return err; } int get_addr(inet_prefix * dst, char *arg, int family) { if (family == AF_PACKET) { bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context.", arg); } if (get_addr_1(dst, arg, family)) { bb_error_msg_and_die("an inet address is expected rather than \"%s\".", arg); } return 0; } int get_prefix(inet_prefix * dst, char *arg, int family) { if (family == AF_PACKET) { bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context.", arg); } if (get_prefix_1(dst, arg, family)) { bb_error_msg_and_die("an inet address is expected rather than \"%s\".", arg); } return 0; } __u32 get_addr32(char *name) { inet_prefix addr; if (get_addr_1(&addr, name, AF_INET)) { bb_error_msg_and_die("an IP address is expected rather than \"%s\"", name); } return addr.data[0]; } void incomplete_command(void) { bb_error_msg("Command line is not complete. Try option \"help\""); exit(-1); } void invarg(const char * const arg, const char * const opt) { bb_error_msg(bb_msg_invalid_arg, arg, opt); exit(-1); } void duparg(char *key, char *arg) { bb_error_msg("duplicate \"%s\": \"%s\" is the second value.", key, arg); exit(-1); } void duparg2(char *key, char *arg) { bb_error_msg("either \"%s\" is duplicate, or \"%s\" is a garbage.", key, arg); exit(-1); } int matches(char *cmd, char *pattern) { int len = strlen(cmd); if (len > strlen(pattern)) { return -1; } return memcmp(pattern, cmd, len); } int inet_addr_match(inet_prefix * a, inet_prefix * b, int bits) { __u32 *a1 = a->data; __u32 *a2 = b->data; int words = bits >> 0x05; bits &= 0x1f; if (words) if (memcmp(a1, a2, words << 2)) return -1; if (bits) { __u32 w1, w2; __u32 mask; w1 = a1[words]; w2 = a2[words]; mask = htonl((0xffffffff) << (0x20 - bits)); if ((w1 ^ w2) & mask) return 1; } return 0; } int __iproute2_hz_internal; int __get_hz(void) { int hz = 0; FILE *fp = fopen("/proc/net/psched", "r"); if (fp) { unsigned nom, denom; if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) if (nom == 1000000) hz = denom; fclose(fp); } if (hz) return hz; return sysconf(_SC_CLK_TCK); } const char *rt_addr_n2a(int af, int ATTRIBUTE_UNUSED len, void *addr, char *buf, int buflen) { switch (af) { case AF_INET: case AF_INET6: return inet_ntop(af, addr, buf, buflen); default: return "???"; } } const char *format_host(int af, int len, void *addr, char *buf, int buflen) { #ifdef RESOLVE_HOSTNAMES if (resolve_hosts) { struct hostent *h_ent; if (len <= 0) { switch (af) { case AF_INET: len = 4; break; case AF_INET6: len = 16; break; default:; } } if (len > 0 && (h_ent = gethostbyaddr(addr, len, af)) != NULL) { snprintf(buf, buflen - 1, "%s", h_ent->h_name); return buf; } } #endif return rt_addr_n2a(af, len, addr, buf, buflen); }