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SOCK: avoid calling strcpy with overlapping arguments when converting IPv4-mapped address strings. Fixes issue #111

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This commit is contained in:
Mark Pizzolato
2014-02-12 03:40:10 -08:00
parent 519f7f2c03
commit c8991a4084
1 changed files with 4 additions and 2 deletions
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6
sim_sock.c
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@@ -1069,7 +1069,8 @@ if (connectaddr != NULL) {
#ifdef AF_INET6 #ifdef AF_INET6
p_getnameinfo((struct sockaddr *)&clientname, size, *connectaddr, NI_MAXHOST, NULL, 0, NI_NUMERICHOST); p_getnameinfo((struct sockaddr *)&clientname, size, *connectaddr, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (0 == memcmp("::ffff:", *connectaddr, 7)) /* is this a IPv4-mapped IPv6 address? */ if (0 == memcmp("::ffff:", *connectaddr, 7)) /* is this a IPv4-mapped IPv6 address? */
strcpy(*connectaddr, 7+*connectaddr); /* prefer bare IPv4 address if possible */ memmove(*connectaddr, 7+*connectaddr, /* prefer bare IPv4 address */
strlen(*connectaddr) - 7 + 1); /* length to include terminating \0 */
#else #else
strcpy(*connectaddr, inet_ntoa(((struct sockaddr_in *)&connectaddr)->s_addr)); strcpy(*connectaddr, inet_ntoa(((struct sockaddr_in *)&connectaddr)->s_addr));
#endif #endif
@@ -1148,7 +1149,8 @@ int32 ret = 0;
*portnamebuf = '\0'; *portnamebuf = '\0';
ret = p_getnameinfo(addr, size, hostnamebuf, NI_MAXHOST, NULL, 0, NI_NUMERICHOST); ret = p_getnameinfo(addr, size, hostnamebuf, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (0 == memcmp("::ffff:", hostnamebuf, 7)) /* is this a IPv4-mapped IPv6 address? */ if (0 == memcmp("::ffff:", hostnamebuf, 7)) /* is this a IPv4-mapped IPv6 address? */
strcpy(hostnamebuf, 7+hostnamebuf); /* prefer bare IPv4 address if possible */ memmove(hostnamebuf, 7+hostnamebuf, /* prefer bare IPv4 address */
strlen(hostnamebuf) + 7 - 1); /* length to include terminating \0 */
if (!ret) if (!ret)
ret = p_getnameinfo(addr, size, NULL, 0, portnamebuf, NI_MAXSERV, NI_NUMERICSERV); ret = p_getnameinfo(addr, size, NULL, 0, portnamebuf, NI_MAXSERV, NI_NUMERICSERV);
#else #else