diff options
Diffstat (limited to 'staging/modifications.c')
| -rw-r--r-- | staging/modifications.c | 39 |
1 files changed, 11 insertions, 28 deletions
diff --git a/staging/modifications.c b/staging/modifications.c index 1affbbb..b105db0 100644 --- a/staging/modifications.c +++ b/staging/modifications.c @@ -24,7 +24,7 @@ // This sections contains functions to manipulate headers of // Eth, MPLS, 802.1Q, IP, UDP, and TCP: // -// int update_Eth_SA (libnet_t *l, libnet_ptag_t t) +// int rand_addr (u_int8_t *addr) // int update_IP_SA (libnet_t *l, libnet_ptag_t t) // int update_IP_DA (libnet_t *l, libnet_ptag_t t) // int update_IP6_SA (libnet_t *l, libnet_ptag_t t) @@ -42,36 +42,19 @@ #include "mz.h" #include "mops.h" -/////////////////////////////////////////////////////////////////////////// -// Applies another random Ethernet source address to a given Ethernet-PTAG. -// (The calling function should check 'tx.eth_src_rand' whether the SA +// Applies another random address to a given buffer. +// (The calling function should check 'tx.eth_(dst|src)_rand' whether the address // should be randomized.) -// -int update_Eth_SA(libnet_t *l, libnet_ptag_t t) +void rand_addr(u_int8_t *addr) { - tx.eth_src[0] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256) & 0xFE; // keeps bcast-bit zero - tx.eth_src[1] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256); - tx.eth_src[2] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256); - tx.eth_src[3] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256); - tx.eth_src[4] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256); - tx.eth_src[5] = (u_int8_t) ( ((float) rand()/RAND_MAX)*256); - - t = libnet_build_ethernet (tx.eth_dst, - tx.eth_src, - tx.eth_type, - NULL, // the payload - 0, - l, - t); + nrand48((unsigned short *)addr); + nrand48((unsigned short *)(addr + 3)); - if (t == -1) - { - fprintf(stderr, " mz/update_Eth_SA: Can't build Ethernet header: %s\n", - libnet_geterror(l)); - exit(EXIT_FAILURE); - } - - return 0; + // Get rid of multicast addresses + addr[0] &= 0xfe; + + // Set the locally administered bit + addr[0] |= 2; } |