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added support for displaying signed frames.

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This commit is contained in:
gardners 2012-04-15 01:09:25 +09:30
parent 5f01210353
commit 2bcf07144e
1 changed files with 25 additions and 1 deletions
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26
serval_packetvisualise.c
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@ -182,6 +182,7 @@ int isOverlayPacket(FILE *f,unsigned char *packet,int *ofs,int len)
int cantDecodeFrame=0;
int cantDecodeRecipient=0;
int showSignature=0;
fprintf(f,"%sframe is ",indent(8));
switch(frame_flags&0x3) {
case 0: fprintf(f,"not compressed"); break;
@ -197,7 +198,12 @@ int isOverlayPacket(FILE *f,unsigned char *packet,int *ofs,int len)
case 4: fprintf(f,"encrypted using recipients public key (SID)");
cantDecodeFrame=1; break;
case 8: fprintf(f,"signed using senders public signing key (SAS)");
cantDecodeFrame=1; break;
/* This doesn't stop us displaying the frame, as the body is still en claire.
It does mean that we should present the signature block, and not
show the signature as part of the packet body. */
cantDecodeFrame=0;
showSignature=1;
break;
case 0xc: fprintf(f,"authcrypted (encrypted and authenticated) using CryptoBox (SID)");
cantDecodeFrame=1; break;
}
@ -227,6 +233,7 @@ int isOverlayPacket(FILE *f,unsigned char *packet,int *ofs,int len)
fprintf(f,"%sFrame payload begins at offset 0x%x\n",indent(8),*ofs);
frame=&packet[*ofs];
frame_len=next_frame_ofs-(*ofs);
if (showSignature) frame_len-=64;
frame_ofs=0;
} else {
fprintf(f,"%sWARNING: Cannot decode frame addresses due to encryption.\n",
@ -451,6 +458,23 @@ int isOverlayPacket(FILE *f,unsigned char *packet,int *ofs,int len)
}
break;
}
if (showSignature) {
int i,j;
fprintf(f,"%sWARNING: Signature is for display purposes, and has not been verified\n",indent(8));
fprintf(f,"%sFrame signature block (SAS signed):\n",indent(8));
for(i=0;i<64;i+=16)
{
fprintf(f,"%s%04x :",indent(10),i);
for(j=0;j<16&&(i+j)<len;j++) fprintf(f," %02x",frame[frame_len+i+j]);
for(;j<16;j++) fprintf(f," ");
fprintf(f," ");
for(j=0;j<16&&(i+j)<len;j++)
fprintf(f,"%c",frame[frame_len+i+j]>=' '
&&frame[frame_len+i+j]<0x7c?frame[frame_len+i+j]:'.');
fprintf(f,"\n");
}
}
}
nextframe: