diff options
Diffstat (limited to 'resolv/inet_addr.c')
| -rw-r--r-- | resolv/inet_addr.c | 32 |
1 files changed, 8 insertions, 24 deletions
diff --git a/resolv/inet_addr.c b/resolv/inet_addr.c index a5667eb6ed..fe15b5701b 100644 --- a/resolv/inet_addr.c +++ b/resolv/inet_addr.c @@ -99,6 +99,7 @@ inet_aton(cp, addr) const char *cp; struct in_addr *addr; { + static const u_int32_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff }; register u_int32_t val; /* changed from u_long --david */ #ifndef _LIBC register int base; @@ -113,6 +114,8 @@ inet_aton(cp, addr) __set_errno (0); #endif + memset (parts, '\0', sizeof (parts)); + c = *cp; for (;;) { /* @@ -178,33 +181,14 @@ inet_aton(cp, addr) * the number of parts specified. */ n = pp - parts + 1; - switch (n) { - - case 0: - goto ret_0; /* initial nondigit */ - case 1: /* a -- 32 bits */ - break; + if (n == 0 /* initial nondigit */ + || parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff + || val > max[n - 1]) + goto ret_0; - case 2: /* a.b -- 8.24 bits */ - if (parts[0] > 0xff || val > 0xffffff) - goto ret_0; - val |= parts[0] << 24; - break; + val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); - case 3: /* a.b.c -- 8.8.16 bits */ - if (parts[0] > 0xff || parts[1] > 0xff || val > 0xffff) - goto ret_0; - val |= (parts[0] << 24) | (parts[1] << 16); - break; - - case 4: /* a.b.c.d -- 8.8.8.8 bits */ - if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff - || val > 0xff) - goto ret_0; - val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); - break; - } if (addr) addr->s_addr = htonl(val); |