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/* |
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* Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net> |
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
|
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#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
|
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "clamav.h" |
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#include "cvd.h" |
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#include "strings.h" |
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#include "matcher-ac.h"
#include "matcher-bm.h" |
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#include "others.h"
#include "str.h"
#include "defaults.h"
|
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/* TODO: clean up the code */ |
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|
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static int cli_ac_addsig(struct cl_node *root, const char *virname, const char *hexsig, int sigid, int parts, int partno, unsigned short type, unsigned int mindist, unsigned int maxdist, char *offset, unsigned short target) |
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{ |
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struct cli_ac_patt *new; |
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char *pt, *hex;
int virlen, ret, i, error = 0; |
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|
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if((new = (struct cli_ac_patt *) cli_calloc(1, sizeof(struct cli_ac_patt))) == NULL) |
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return CL_EMEM;
|
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new->type = type; |
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new->sigid = sigid;
new->parts = parts;
new->partno = partno; |
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new->mindist = mindist;
new->maxdist = maxdist; |
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new->target = target;
new->offset = offset; |
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|
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if(strchr(hexsig, '(')) { |
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char *hexcpy, *hexnew, *start, *h, *c; |
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if(!(hexcpy = strdup(hexsig))) {
free(new);
return CL_EMEM;
}
if(!(hexnew = (char *) cli_calloc(strlen(hexsig) + 1, 1))) {
free(hexcpy);
free(new);
return CL_EMEM;
}
start = pt = hexcpy;
while((pt = strchr(start, '('))) {
*pt++ = 0;
if(!start) {
error = 1;
break;
}
strcat(hexnew, start);
strcat(hexnew, "@@");
if(!(start = strchr(pt, ')'))) {
error = 1;
break;
}
*start++ = 0;
new->alt++; |
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new->altn = (unsigned short int *) realloc(new->altn, new->alt * sizeof(unsigned short int)); |
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new->altn[new->alt - 1] = 0; |
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new->altc = (char **) realloc(new->altc, new->alt * sizeof(char *)); |
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for(i = 0; i < strlen(pt); i++)
if(pt[i] == '|')
new->altn[new->alt - 1]++;
if(!new->altn[new->alt - 1]) {
error = 1;
break;
} else
new->altn[new->alt - 1]++;
if(!(new->altc[new->alt - 1] = (char *) cli_calloc(new->altn[new->alt - 1], 1))) {
error = 1;
break;
}
for(i = 0; i < new->altn[new->alt - 1]; i++) {
if((h = cli_strtok(pt, i, "|")) == NULL) {
error = 1;
break;
}
|
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if((c = cli_hex2str(h)) == NULL) { |
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free(h);
error = 1;
break;
}
|
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new->altc[new->alt - 1][i] = *c; |
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free(c);
free(h);
}
if(error)
break;
}
if(start)
strcat(hexnew, start);
hex = hexnew;
free(hexcpy);
if(error) {
free(hexnew);
if(new->alt) {
free(new->altn);
for(i = 0; i < new->alt; i++)
free(new->altc[i]);
free(new->altc);
}
free(new);
return CL_EMALFDB;
}
} else
hex = (char *) hexsig;
new->length = strlen(hex) / 2; |
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if(new->length > root->maxpatlen)
root->maxpatlen = new->length;
|
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if((new->pattern = cli_hex2si(hex)) == NULL) { |
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if(new->alt) {
free(new->altn);
for(i = 0; i < new->alt; i++)
free(new->altc[i]);
free(new->altc);
free(hex);
} |
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free(new);
return CL_EMALFDB;
}
if((pt = strstr(virname, "(Clam)")))
virlen = strlen(virname) - strlen(pt) - 1;
else
virlen = strlen(virname);
|
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if(virlen <= 0) { |
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free(new->pattern); |
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if(new->alt) {
free(new->altn);
for(i = 0; i < new->alt; i++)
free(new->altc[i]);
free(new->altc);
free(hex);
} |
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free(new);
return CL_EMALFDB;
}
|
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if((new->virname = cli_calloc(virlen + 1, sizeof(char))) == NULL) { |
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free(new->pattern); |
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if(new->alt) {
free(new->altn);
for(i = 0; i < new->alt; i++)
free(new->altc[i]);
free(new->altc);
free(hex);
} |
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free(new); |
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return CL_EMEM; |
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}
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strncpy(new->virname, virname, virlen); |
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|
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if((ret = cli_ac_addpatt(root, new))) { |
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free(new->pattern); |
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free(new->virname); |
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if(new->alt) {
free(new->altn);
for(i = 0; i < new->alt; i++)
free(new->altc[i]);
free(new->altc);
free(hex);
} |
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free(new); |
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return ret; |
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} |
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|
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if(new->alt)
free(hex);
|
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return 0;
}
|
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int cli_parse_add(struct cl_node *root, const char *virname, const char *hexsig, unsigned short type, char *offset, unsigned short target) |
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{ |
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struct cli_bm_patt *bm_new; |
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char *pt, *hexcpy, *start, *n; |
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int ret, virlen, parts = 0, i, len; |
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int mindist = 0, maxdist = 0, error = 0;
|
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|
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if(strchr(hexsig, '{')) { |
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|
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root->ac_partsigs++; |
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if(!(hexcpy = strdup(hexsig)))
return CL_EMEM;
len = strlen(hexsig);
for(i = 0; i < len; i++)
if(hexsig[i] == '{')
parts++;
if(parts)
parts++;
start = pt = hexcpy;
for(i = 1; i <= parts; i++) {
if(i != parts) {
pt = strchr(start, '{');
*pt++ = 0;
}
|
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if((ret = cli_ac_addsig(root, virname, start, root->ac_partsigs, parts, i, type, mindist, maxdist, offset, target))) { |
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cli_errmsg("cli_parse_add(): Problem adding signature.\n");
error = 1;
break;
}
if(i == parts)
break;
if(!(start = strchr(pt, '}'))) {
error = 1;
break;
}
*start++ = 0;
if(!pt) {
error = 1;
break;
}
mindist = maxdist = 0;
if(!strchr(pt, '-')) {
if((mindist = maxdist = atoi(pt)) < 0) {
error = 1;
break;
}
} else { |
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if((n = cli_strtok(pt, 0, "-"))) { |
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if((mindist = atoi(n)) < 0) {
error = 1;
free(n);
break;
}
free(n);
}
|
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if((n = cli_strtok(pt, 1, "-"))) { |
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if((maxdist = atoi(n)) < 0) {
error = 1;
free(n);
break;
}
free(n);
}
}
}
free(hexcpy);
if(error)
return CL_EMALFDB;
} else if(strchr(hexsig, '*')) { |
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root->ac_partsigs++; |
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len = strlen(hexsig);
for(i = 0; i < len; i++)
if(hexsig[i] == '*')
parts++;
|
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if(parts) |
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parts++;
for(i = 1; i <= parts; i++) {
if((pt = cli_strtok(hexsig, i - 1, "*")) == NULL) {
cli_errmsg("Can't extract part %d of partial signature.\n", i + 1);
return CL_EMALFDB;
}
|
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if((ret = cli_ac_addsig(root, virname, pt, root->ac_partsigs, parts, i, type, 0, 0, offset, target))) { |
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cli_errmsg("cli_parse_add(): Problem adding signature.\n");
free(pt);
return ret;
}
free(pt);
}
|
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} else if(strpbrk(hexsig, "?(") || type) { |
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if((ret = cli_ac_addsig(root, virname, hexsig, 0, 0, 0, type, 0, 0, offset, target))) { |
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cli_errmsg("cli_parse_add(): Problem adding signature\n");
return ret;
}
} else {
bm_new = (struct cli_bm_patt *) calloc(1, sizeof(struct cli_bm_patt));
if(!bm_new)
return CL_EMEM;
|
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if(!(bm_new->pattern = cli_hex2str(hexsig))) {
free(bm_new); |
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return CL_EMALFDB; |
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} |
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bm_new->length = strlen(hexsig) / 2;
if((pt = strstr(virname, "(Clam)")))
virlen = strlen(virname) - strlen(pt) - 1;
else
virlen = strlen(virname);
if(virlen <= 0) { |
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free(bm_new->pattern); |
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free(bm_new);
return CL_EMALFDB;
}
if((bm_new->virname = cli_calloc(virlen + 1, sizeof(char))) == NULL) { |
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free(bm_new->pattern); |
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free(bm_new);
return CL_EMEM;
}
strncpy(bm_new->virname, virname, virlen);
|
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bm_new->offset = offset;
bm_new->target = target;
|
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if(bm_new->length > root->maxpatlen)
root->maxpatlen = bm_new->length;
if((ret = cli_bm_addpatt(root, bm_new))) {
cli_errmsg("cli_parse_add(): Problem adding signature\n"); |
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free(bm_new->pattern);
free(bm_new->virname);
free(bm_new); |
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return ret;
}
}
return 0;
} |
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|
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static int cli_loaddb(FILE *fd, struct cl_node **root, unsigned int *signo) |
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{ |
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char buffer[FILEBUFF], *pt, *start;
int line = 0, ret = 0; |
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|
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if(!*root) {
cli_dbgmsg("Initializing main node\n");
*root = (struct cl_node *) cli_calloc(1, sizeof(struct cl_node));
if(!*root)
return CL_EMEM; |
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}
|
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if(!(*root)->ac_root) {
cli_dbgmsg("Initializing trie\n");
(*root)->ac_root = (struct cli_ac_node *) cli_calloc(1, sizeof(struct cli_ac_node));
if(!(*root)->ac_root) {
free(*root); |
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cli_errmsg("Can't initialise AC pattern matcher\n"); |
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return CL_EMEM;
} |
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} |
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|
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if(!(*root)->bm_shift) {
cli_dbgmsg("Initializing BM tables\n");
if((ret = cli_bm_init(*root))) {
cli_errmsg("Can't initialise BM pattern matcher\n");
return ret;
}
}
|
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while(fgets(buffer, FILEBUFF, fd)) {
line++;
cli_chomp(buffer);
pt = strchr(buffer, '=');
if(!pt) {
cli_errmsg("Malformed pattern line %d\n", line);
ret = CL_EMALFDB;
break;
}
start = buffer;
*pt++ = 0; |
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|
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if(*pt == '=') continue; |
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|
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if((ret = cli_parse_add(*root, start, pt, 0, NULL, 0))) {
cli_errmsg("Problem parsing signature at line %d\n", line);
ret = CL_EMALFDB;
break;
}
}
if(!line) {
cli_errmsg("Empty database file\n");
cl_free(*root);
return CL_EMALFDB;
}
if(ret) {
cli_errmsg("Problem parsing database at line %d\n", line);
cl_free(*root);
return ret;
}
if(signo)
*signo += line;
return 0;
}
static int cli_loadndb(FILE *fd, struct cl_node **root, unsigned int *signo)
{
char buffer[FILEBUFF], *sig, *virname, *offset, *pt;
int line = 0, ret = 0;
unsigned short target;
if(!*root) {
cli_dbgmsg("Initializing main node\n");
*root = (struct cl_node *) cli_calloc(1, sizeof(struct cl_node));
if(!*root)
return CL_EMEM;
}
if(!(*root)->ac_root) {
cli_dbgmsg("Initializing trie\n");
(*root)->ac_root = (struct cli_ac_node *) cli_calloc(1, sizeof(struct cli_ac_node));
if(!(*root)->ac_root) {
free(*root);
cli_errmsg("Can't initialise AC pattern matcher\n");
return CL_EMEM;
}
}
if(!(*root)->bm_shift) {
cli_dbgmsg("Initializing BM tables\n");
if((ret = cli_bm_init(*root))) {
cli_errmsg("Can't initialise BM pattern matcher\n");
return ret;
}
}
while(fgets(buffer, FILEBUFF, fd)) {
line++;
cli_chomp(buffer);
if(!(virname = cli_strtok(buffer, 0, ":"))) {
ret = CL_EMALFDB;
break;
}
if(!(pt = cli_strtok(buffer, 1, ":")) || !isdigit(*pt)) {
free(virname);
ret = CL_EMALFDB;
break;
}
target = (unsigned short) atoi(pt);
free(pt);
if(!(offset = cli_strtok(buffer, 2, ":"))) {
free(virname);
ret = CL_EMALFDB;
break;
}
if(!(sig = cli_strtok(buffer, 3, ":"))) {
free(virname);
free(offset);
ret = CL_EMALFDB;
break;
}
if((ret = cli_parse_add(*root, virname, sig, 0, offset, target))) { |
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cli_errmsg("Problem parsing signature at line %d\n", line); |
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free(virname);
free(offset);
free(sig); |
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ret = CL_EMALFDB;
break;
} |
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free(virname);
free(sig); |
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}
|
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if(!line) {
cli_errmsg("Empty database file\n"); |
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cl_free(*root); |
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return CL_EMALFDB;
} |
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|
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if(ret) { |
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cli_errmsg("Problem parsing database at line %d\n", line); |
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cl_free(*root); |
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return ret;
}
|
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if(signo)
*signo += line; |
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return 0;
}
|
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static int cli_loadhdb(FILE *fd, struct cl_node **root, unsigned int *signo) |
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{ |
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char buffer[FILEBUFF], *pt; |
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int line = 0, ret = 0;
struct cli_md5_node *new; |
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|
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if(!*root) {
cli_dbgmsg("Initializing main node\n");
*root = (struct cl_node *) cli_calloc(1, sizeof(struct cl_node));
if(!*root)
return CL_EMEM;
}
while(fgets(buffer, FILEBUFF, fd)) { |
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line++;
cli_chomp(buffer);
|
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new = (struct cli_md5_node *) cli_calloc(1, sizeof(struct cli_md5_node));
if(!new) {
ret = CL_EMEM;
break; |
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}
|
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if(!(pt = cli_strtok(buffer, 0, ":"))) {
free(new);
ret = CL_EMALFDB;
break;
} |
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|
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if(!(new->md5 = (unsigned char *) cli_hex2str(pt))) { |
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cli_errmsg("Malformed MD5 string at line %d\n", line);
free(pt);
free(new);
ret = CL_EMALFDB;
break; |
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} |
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free(pt); |
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|
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if(!(pt = cli_strtok(buffer, 1, ":"))) {
free(new->md5);
free(new);
ret = CL_EMALFDB;
break;
}
new->size = atoi(pt);
free(pt);
if(!(new->virname = cli_strtok(buffer, 2, ":"))) { |
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free(new->md5);
free(new);
ret = CL_EMALFDB;
break; |
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} |
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|
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new->viralias = cli_strtok(buffer, 3, ":"); /* aliases are optional */ |
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|
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if(!(*root)->md5_hlist) {
cli_dbgmsg("Initializing md5 list structure\n");
(*root)->md5_hlist = (struct cli_md5_node **) cli_calloc(256, sizeof(struct cli_md5_node *));
if(!(*root)->md5_hlist) {
ret = CL_EMEM;
break;
}
}
new->next = (*root)->md5_hlist[new->md5[0] & 0xff];
(*root)->md5_hlist[new->md5[0] & 0xff] = new; |
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}
|
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if(!line) {
cli_errmsg("Empty database file\n"); |
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cl_free(*root); |
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return CL_EMALFDB;
} |
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|
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if(ret) { |
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cli_errmsg("Problem parsing database at line %d\n", line); |
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cl_free(*root); |
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return ret;
} |
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|
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if(signo)
*signo += line; |
372063ec |
|
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return 0;
}
|
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int cl_loaddb(const char *filename, struct cl_node **root, unsigned int *signo) |
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{ |
ff8cb48b |
FILE *fd;
int ret;
if((fd = fopen(filename, "rb")) == NULL) {
cli_errmsg("cl_loaddb(): Can't open file %s\n", filename);
return CL_EOPEN;
}
cli_dbgmsg("Loading %s\n", filename);
if(cli_strbcasestr(filename, ".db") || cli_strbcasestr(filename, ".db2") || cli_strbcasestr(filename, ".db3")) { |
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ret = cli_loaddb(fd, root, signo); |
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} else if(cli_strbcasestr(filename, ".cvd")) { |
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ret = cli_cvdload(fd, root, signo); |
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} else if(cli_strbcasestr(filename, ".hdb")) { |
06d4e856 |
ret = cli_loadhdb(fd, root, signo); |
ff8cb48b |
|
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} else if(cli_strbcasestr(filename, ".ndb")) {
ret = cli_loadndb(fd, root, signo);
|
ff8cb48b |
} else {
cli_dbgmsg("cl_loaddb: unknown extension - assuming old database format\n"); |
06d4e856 |
ret = cli_loaddb(fd, root, signo); |
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}
if(ret)
cli_errmsg("Malformed database file %s\n", filename);
fclose(fd);
return ret; |
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}
|
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int cl_loaddbdir(const char *dirname, struct cl_node **root, unsigned int *signo) |
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{
DIR *dd;
struct dirent *dent;
char *dbfile;
int ret;
if((dd = opendir(dirname)) == NULL) {
cli_errmsg("cl_loaddbdir(): Can't open directory %s\n", dirname);
return CL_EOPEN;
}
cli_dbgmsg("Loading databases from %s\n", dirname);
while((dent = readdir(dd))) { |
618a038b |
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{ |
4cd4319e |
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") &&
(cli_strbcasestr(dent->d_name, ".db") ||
cli_strbcasestr(dent->d_name, ".db2") || |
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cli_strbcasestr(dent->d_name, ".db3") || |
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cli_strbcasestr(dent->d_name, ".hdb") || |
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cli_strbcasestr(dent->d_name, ".ndb") || |
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cli_strbcasestr(dent->d_name, ".cvd"))) {
|
b151ef55 |
dbfile = (char *) cli_calloc(strlen(dent->d_name) + strlen(dirname) + 2, sizeof(char));
if(!dbfile) { |
4cd4319e |
cli_dbgmsg("cl_loaddbdir(): dbfile == NULL\n"); |
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closedir(dd);
return CL_EMEM;
}
sprintf(dbfile, "%s/%s", dirname, dent->d_name); |
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if((ret = cl_loaddb(dbfile, root, signo))) { |
c0eb3ceb |
cli_dbgmsg("cl_loaddbdir(): error loading database %s\n", dbfile); |
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free(dbfile);
closedir(dd);
return ret;
}
free(dbfile);
}
}
}
closedir(dd);
return 0;
}
|
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const char *cl_retdbdir(void)
{
return DATADIR;
}
|
b151ef55 |
int cl_statinidir(const char *dirname, struct cl_stat *dbstat)
{
DIR *dd;
struct dirent *dent;
char *fname;
if(dbstat) {
dbstat->no = 0;
dbstat->stattab = NULL;
dbstat->dir = strdup(dirname);
} else {
cli_errmsg("cl_statdbdir(): Null argument passed.\n");
return CL_ENULLARG;
}
if((dd = opendir(dirname)) == NULL) {
cli_errmsg("cl_statdbdir(): Can't open directory %s\n", dirname);
return CL_EOPEN;
}
cli_dbgmsg("Stat()ing files in %s\n", dirname);
while((dent = readdir(dd))) { |
618a038b |
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{ |
f91f55e0 |
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") &&
(cli_strbcasestr(dent->d_name, ".db") ||
cli_strbcasestr(dent->d_name, ".db2") ||
cli_strbcasestr(dent->d_name, ".db3") ||
cli_strbcasestr(dent->d_name, ".hdb") || |
df757556 |
cli_strbcasestr(dent->d_name, ".ndb") || |
f91f55e0 |
cli_strbcasestr(dent->d_name, ".cvd"))) { |
b151ef55 |
dbstat->no++;
dbstat->stattab = (struct stat *) realloc(dbstat->stattab, dbstat->no * sizeof(struct stat));
fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
sprintf(fname, "%s/%s", dirname, dent->d_name);
stat(fname, &dbstat->stattab[dbstat->no - 1]);
free(fname);
}
}
}
closedir(dd);
return 0;
}
int cl_statchkdir(const struct cl_stat *dbstat)
{
DIR *dd;
struct dirent *dent;
struct stat sb;
int i, found;
char *fname;
if(!dbstat || !dbstat->dir) {
cli_errmsg("cl_statdbdir(): Null argument passed.\n");
return CL_ENULLARG;
}
if((dd = opendir(dbstat->dir)) == NULL) {
cli_errmsg("cl_statdbdir(): Can't open directory %s\n", dbstat->dir);
return CL_EOPEN;
}
cli_dbgmsg("Stat()ing files in %s\n", dbstat->dir);
while((dent = readdir(dd))) { |
618a038b |
#ifndef C_INTERIX
if(dent->d_ino)
#endif
{ |
f91f55e0 |
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..") &&
(cli_strbcasestr(dent->d_name, ".db") ||
cli_strbcasestr(dent->d_name, ".db2") ||
cli_strbcasestr(dent->d_name, ".db3") ||
cli_strbcasestr(dent->d_name, ".hdb") || |
df757556 |
cli_strbcasestr(dent->d_name, ".ndb") || |
f91f55e0 |
cli_strbcasestr(dent->d_name, ".cvd"))) { |
b151ef55 |
fname = cli_calloc(strlen(dbstat->dir) + strlen(dent->d_name) + 2, sizeof(char));
sprintf(fname, "%s/%s", dbstat->dir, dent->d_name);
stat(fname, &sb);
free(fname);
found = 0;
for(i = 0; i < dbstat->no; i++)
if(dbstat->stattab[i].st_ino == sb.st_ino) {
found = 1; |
82b133ea |
if(dbstat->stattab[i].st_mtime != sb.st_mtime) {
closedir(dd); |
b151ef55 |
return 1; |
82b133ea |
} |
b151ef55 |
}
|
82b133ea |
if(!found) {
closedir(dd); |
b151ef55 |
return 1; |
82b133ea |
} |
b151ef55 |
}
}
}
closedir(dd);
return 0;
}
int cl_statfree(struct cl_stat *dbstat)
{
if(dbstat) {
free(dbstat->stattab);
dbstat->stattab = NULL;
dbstat->no = 0; |
9c1c9007 |
if(dbstat->dir) { |
b151ef55 |
free(dbstat->dir); |
9c1c9007 |
dbstat->dir = NULL;
} |
b151ef55 |
} else { |
f91f55e0 |
cli_errmsg("cl_statfree(): Null argument passed\n"); |
b151ef55 |
return CL_ENULLARG;
}
return 0;
} |