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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: ctm_pass1.c,v 1.8 1995/03/04 20:36:46 phk Exp $
*
*/
#include "ctm.h"
#define BADREAD 1
/*---------------------------------------------------------------------------*/
/* Pass1 -- Validate the incoming CTM-file.
*/
int
Pass1(FILE *fd, unsigned applied)
{
u_char *p,*q;
MD5_CTX ctx;
int i,j,sep,cnt;
u_char *md5=0,*trash=0;
struct CTM_Syntax *sp;
int slashwarn=0;
unsigned current;
if(Verbose>3)
printf("Pass1 -- Checking integrity of incoming CTM-patch\n");
MD5Init (&ctx);
GETFIELD(p,' '); /* CTM_BEGIN */
if(strcmp(p,"CTM_BEGIN")) {
Fatal("Probably not a CTM-patch at all.");
if(Verbose>3)
fprintf(stderr,"Expected \"CTM_BEGIN\" got \"%s\".\n",p);
return 1;
}
GETFIELDCOPY(Version,' '); /* <Version> */
if(strcmp(Version,VERSION)) {
Fatal("CTM-patch is wrong version.");
if(Verbose>3)
fprintf(stderr,"Expected \"%s\" got \"%s\".\n",VERSION,p);
return 1;
}
GETFIELDCOPY(Name,' '); /* <Name> */
GETFIELDCOPY(Nbr,' '); /* <Nbr> */
GETFIELDCOPY(TimeStamp,' '); /* <TimeStamp> */
GETFIELDCOPY(Prefix,'\n'); /* <Prefix> */
sscanf(Nbr, "%u", ¤t);
if(current && current <= applied) {
if(Verbose)
fprintf(stderr,"Delta number %u is already applied; ignoring.\n",
current);
return Exit_Version;
}
for(;;) {
if(md5) {Free(md5), md5 = 0;}
if(trash) {Free(trash), trash = 0;}
cnt = -1;
GETFIELD(p,' '); /* CTM_something */
if (p[0] != 'C' || p[1] != 'T' || p[2] != 'M') {
Fatal("Expected CTM keyword.");
fprintf(stderr,"Got [%s]\n",p);
return 1;
}
if(!strcmp(p+3,"_END"))
break;
for(sp=Syntax;sp->Key;sp++)
if(!strcmp(p+3,sp->Key))
goto found;
Fatal("Expected CTM keyword.");
fprintf(stderr,"Got [%s]\n",p);
return 1;
found:
if(Verbose > 5)
fprintf(stderr,"%s ",sp->Key);
for(i=0;(j = sp->List[i]);i++) {
if (sp->List[i+1] && (sp->List[i+1] & CTM_F_MASK) != CTM_F_Bytes)
sep = ' ';
else
sep = '\n';
if(Verbose > 5)
fprintf(stderr," %x(%d)",sp->List[i],sep);
switch (j & CTM_F_MASK) {
case CTM_F_Name: /* XXX check for garbage and .. */
GETFIELD(p,sep);
j = strlen(p);
if(p[j-1] == '/' && !slashwarn) {
fprintf(stderr,"Warning: contains trailing slash\n");
slashwarn++;
}
if (p[0] == '/') {
Fatal("Absolute paths are illegal.");
return Exit_Mess;
}
for (;;) {
if (p[0] == '.' && p[1] == '.')
if (p[2] == '/' || p[2] == '\0') {
Fatal("Paths containing '..' are illegal.");
return Exit_Mess;
}
if ((p = strchr(p, '/')) == NULL)
break;
p++;
}
break;
case CTM_F_Uid:
GETFIELD(p,sep);
while(*p) {
if(!isdigit(*p)) {
Fatal("Non-digit in uid.");
return 32;
}
p++;
}
break;
case CTM_F_Gid:
GETFIELD(p,sep);
while(*p) {
if(!isdigit(*p)) {
Fatal("Non-digit in gid.");
return 32;
}
p++;
}
break;
case CTM_F_Mode:
GETFIELD(p,sep);
while(*p) {
if(!isdigit(*p)) {
Fatal("Non-digit in mode.");
return 32;
}
p++;
}
break;
case CTM_F_MD5:
if(j & CTM_Q_MD5_Chunk) {
GETFIELDCOPY(md5,sep); /* XXX check for garbage */
} else if(j & CTM_Q_MD5_Before) {
GETFIELD(p,sep); /* XXX check for garbage */
} else if(j & CTM_Q_MD5_After) {
GETFIELD(p,sep); /* XXX check for garbage */
} else {
fprintf(stderr,"List = 0x%x\n",j);
Fatal("Unqualified MD5.");
return 32;
}
break;
case CTM_F_Count:
GETBYTECNT(cnt,sep);
break;
case CTM_F_Bytes:
if(cnt < 0) WRONG
GETDATA(trash,cnt);
p = MD5Data(trash,cnt);
if(md5 && strcmp(md5,p)) {
Fatal("Internal MD5 failed.");
return 1;
default:
fprintf(stderr,"List = 0x%x\n",j);
Fatal("List had garbage.");
return 1;
}
}
}
if(Verbose > 5)
putc('\n',stderr);
continue;
}
q = MD5End (&ctx);
if(Verbose > 2)
printf("Expecting Global MD5 <%s>\n",q);
GETFIELD(p,'\n'); /* <MD5> */
if(Verbose > 2)
printf("Reference Global MD5 <%s>\n",p);
if(strcmp(q,p)) {
Fatal("MD5 sum doesn't match.");
fprintf(stderr,"\tI have:<%s>\n",q);
fprintf(stderr,"\tShould have been:<%s>\n",p);
return 1;
}
if (-1 != getc(fd)) {
if(!Force) {
Fatal("Trailing junk in CTM-file. Can Force with -F.");
return 16;
}
}
return 0;
}
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