diff options
Diffstat (limited to 'lib/libalias/alias_cuseeme.c')
| -rw-r--r-- | lib/libalias/alias_cuseeme.c | 107 |
1 files changed, 54 insertions, 53 deletions
diff --git a/lib/libalias/alias_cuseeme.c b/lib/libalias/alias_cuseeme.c index 455973f56d6d..4b0f5a5ddc10 100644 --- a/lib/libalias/alias_cuseeme.c +++ b/lib/libalias/alias_cuseeme.c @@ -40,83 +40,84 @@ __FBSDID("$FreeBSD$"); /* CU-SeeMe Data Header */ struct cu_header { - u_int16_t dest_family; - u_int16_t dest_port; - u_int32_t dest_addr; - int16_t family; - u_int16_t port; - u_int32_t addr; - u_int32_t seq; - u_int16_t msg; - u_int16_t data_type; - u_int16_t packet_len; + u_int16_t dest_family; + u_int16_t dest_port; + u_int32_t dest_addr; + int16_t family; + u_int16_t port; + u_int32_t addr; + u_int32_t seq; + u_int16_t msg; + u_int16_t data_type; + u_int16_t packet_len; }; /* Open Continue Header */ struct oc_header { - u_int16_t client_count; /* Number of client info structs */ - u_int32_t seq_no; - char user_name[20]; - char reserved[4]; /* flags, version stuff, etc */ + u_int16_t client_count; /* Number of client info structs */ + u_int32_t seq_no; + char user_name [20]; + char reserved [4]; /* flags, version stuff, etc */ }; /* client info structures */ struct client_info { - u_int32_t address; /* Client address */ - char reserved[8]; /* Flags, pruning bitfield, packet counts etc */ + u_int32_t address;/* Client address */ + char reserved [8]; /* Flags, pruning bitfield, packet + * counts etc */ }; void AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *link) { - struct udphdr *ud; + struct udphdr *ud; - ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2)); - if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) { - struct cu_header *cu; - struct alias_link *cu_link; + ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2)); + if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) { + struct cu_header *cu; + struct alias_link *cu_link; - cu = (struct cu_header *)(ud + 1); - if (cu->addr) - cu->addr = (u_int32_t)GetAliasAddress(link).s_addr; + cu = (struct cu_header *)(ud + 1); + if (cu->addr) + cu->addr = (u_int32_t) GetAliasAddress(link).s_addr; - cu_link = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(link), - ud->uh_dport, 0, IPPROTO_UDP, 1); + cu_link = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(link), + ud->uh_dport, 0, IPPROTO_UDP, 1); #ifndef NO_FW_PUNCH - if (cu_link) - PunchFWHole(cu_link); + if (cu_link) + PunchFWHole(cu_link); #endif - } + } } void AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr) { - struct in_addr alias_addr; - struct udphdr *ud; - struct cu_header *cu; - struct oc_header *oc; - struct client_info *ci; - char *end; - int i; + struct in_addr alias_addr; + struct udphdr *ud; + struct cu_header *cu; + struct oc_header *oc; + struct client_info *ci; + char *end; + int i; - alias_addr.s_addr = pip->ip_dst.s_addr; - ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2)); - cu = (struct cu_header *)(ud + 1); - oc = (struct oc_header *)(cu + 1); - ci = (struct client_info *)(oc + 1); - end = (char *)ud + ntohs(ud->uh_ulen); + alias_addr.s_addr = pip->ip_dst.s_addr; + ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2)); + cu = (struct cu_header *)(ud + 1); + oc = (struct oc_header *)(cu + 1); + ci = (struct client_info *)(oc + 1); + end = (char *)ud + ntohs(ud->uh_ulen); - if ((char *)oc <= end) { - if(cu->dest_addr) - cu->dest_addr = (u_int32_t)original_addr.s_addr; - if(ntohs(cu->data_type) == 101) - /* Find and change our address */ - for(i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++) - if(ci->address == (u_int32_t)alias_addr.s_addr) { - ci->address = (u_int32_t)original_addr.s_addr; - break; - } - } + if ((char *)oc <= end) { + if (cu->dest_addr) + cu->dest_addr = (u_int32_t) original_addr.s_addr; + if (ntohs(cu->data_type) == 101) + /* Find and change our address */ + for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++) + if (ci->address == (u_int32_t) alias_addr.s_addr) { + ci->address = (u_int32_t) original_addr.s_addr; + break; + } + } } |