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freebsd/usr.sbin/pkg_install/lib/plist.c
Jordan K. Hubbard 12ebd46e4b Prevent buffer overflow in format_cmd() by properly tracking maximum 
buffer size.
Reported by:	Lionnel CHAPTAL <Lionnel.Chaptal@IPricot.com>
MFC after:	1 week
2003-01-06 07:39:02 +00:00

574 lines
13 KiB
C
Raw Blame History

/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Jordan K. Hubbard
* 18 July 1993
*
* General packing list routines.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "lib.h"
#include <err.h>
#include <md5.h>
/* Add an item to a packing list */
void
add_plist(Package *p, plist_t type, const char *arg)
{
PackingList tmp;
tmp = new_plist_entry();
tmp->name = copy_string(arg);
tmp->type = type;
if (!p->head)
p->head = p->tail = tmp;
else {
tmp->prev = p->tail;
p->tail->next = tmp;
p->tail = tmp;
}
switch (type) {
case PLIST_NAME:
p->name = tmp->name;
break;
case PLIST_ORIGIN:
p->origin = tmp->name;
break;
default:
break;
}
}
void
add_plist_top(Package *p, plist_t type, const char *arg)
{
PackingList tmp;
tmp = new_plist_entry();
tmp->name = copy_string(arg);
tmp->type = type;
if (!p->head)
p->head = p->tail = tmp;
else {
tmp->next = p->head;
p->head->prev = tmp;
p->head = tmp;
}
}
/* Return the last (most recent) entry in a packing list */
PackingList
last_plist(Package *p)
{
return p->tail;
}
/* Mark all items in a packing list to prevent iteration over them */
void
mark_plist(Package *pkg)
{
PackingList p = pkg->head;
while (p) {
p->marked = TRUE;
p = p->next;
}
}
/* Find a given item in a packing list and, if so, return it (else NULL) */
PackingList
find_plist(Package *pkg, plist_t type)
{
PackingList p = pkg->head;
while (p) {
if (p->type == type)
return p;
p = p->next;
}
return NULL;
}
/* Look for a specific boolean option argument in the list */
char *
find_plist_option(Package *pkg, const char *name)
{
PackingList p = pkg->head;
while (p) {
if (p->type == PLIST_OPTION && !strcmp(p->name, name))
return p->name;
p = p->next;
}
return NULL;
}
/*
* Delete plist item 'type' in the list (if 'name' is non-null, match it
* too.) If 'all' is set, delete all items, not just the first occurance.
*/
void
delete_plist(Package *pkg, Boolean all, plist_t type, const char *name)
{
PackingList p = pkg->head;
while (p) {
PackingList pnext = p->next;
if (p->type == type && (!name || !strcmp(name, p->name))) {
free(p->name);
if (p->prev)
p->prev->next = pnext;
else
pkg->head = pnext;
if (pnext)
pnext->prev = p->prev;
else
pkg->tail = p->prev;
free(p);
if (!all)
return;
p = pnext;
}
else
p = p->next;
}
}
/* Allocate a new packing list entry */
PackingList
new_plist_entry(void)
{
PackingList ret;
ret = (PackingList)malloc(sizeof(struct _plist));
bzero(ret, sizeof(struct _plist));
return ret;
}
/* Free an entire packing list */
void
free_plist(Package *pkg)
{
PackingList p = pkg->head;
while (p) {
PackingList p1 = p->next;
free(p->name);
free(p);
p = p1;
}
pkg->head = pkg->tail = NULL;
}
/*
* For an ascii string denoting a plist command, return its code and
* optionally its argument(s)
*/
int
plist_cmd(const char *s, char **arg)
{
char cmd[FILENAME_MAX + 20]; /* 20 == fudge for max cmd len */
char *cp;
const char *sp;
strcpy(cmd, s);
str_lowercase(cmd);
cp = cmd;
sp = s;
while (*cp) {
if (isspace(*cp)) {
*cp = '\0';
while (isspace(*sp)) /* Never sure if macro, increment later */
++sp;
break;
}
++cp, ++sp;
}
if (arg)
(const char *)*arg = sp;
if (!strcmp(cmd, "cwd"))
return PLIST_CWD;
else if (!strcmp(cmd, "srcdir"))
return PLIST_SRC;
else if (!strcmp(cmd, "cd"))
return PLIST_CWD;
else if (!strcmp(cmd, "exec"))
return PLIST_CMD;
else if (!strcmp(cmd, "unexec"))
return PLIST_UNEXEC;
else if (!strcmp(cmd, "mode"))
return PLIST_CHMOD;
else if (!strcmp(cmd, "owner"))
return PLIST_CHOWN;
else if (!strcmp(cmd, "group"))
return PLIST_CHGRP;
else if (!strcmp(cmd, "comment")) {
if (!strncmp(*arg, "ORIGIN:", 7)) {
*arg += 7;
return PLIST_ORIGIN;
} else if (!strncmp(*arg, "DEPORIGIN:", 10)) {
*arg += 10;
return PLIST_DEPORIGIN;
}
return PLIST_COMMENT;
} else if (!strcmp(cmd, "ignore"))
return PLIST_IGNORE;
else if (!strcmp(cmd, "ignore_inst"))
return PLIST_IGNORE_INST;
else if (!strcmp(cmd, "name"))
return PLIST_NAME;
else if (!strcmp(cmd, "display"))
return PLIST_DISPLAY;
else if (!strcmp(cmd, "pkgdep"))
return PLIST_PKGDEP;
else if (!strcmp(cmd, "mtree"))
return PLIST_MTREE;
else if (!strcmp(cmd, "dirrm"))
return PLIST_DIR_RM;
else if (!strcmp(cmd, "option"))
return PLIST_OPTION;
else
return FAIL;
}
/* Read a packing list from a file */
void
read_plist(Package *pkg, FILE *fp)
{
char *cp, pline[FILENAME_MAX];
int cmd, major, minor;
pkg->fmtver_maj = 1;
pkg->fmtver_mnr = 0;
pkg->origin = NULL;
while (fgets(pline, FILENAME_MAX, fp)) {
int len = strlen(pline);
while (len && isspace(pline[len - 1]))
pline[--len] = '\0';
if (!len)
continue;
cp = pline;
if (pline[0] != CMD_CHAR) {
cmd = PLIST_FILE;
goto bottom;
}
cmd = plist_cmd(pline + 1, &cp);
if (cmd == FAIL) {
warnx("%s: unknown command '%s' (package tools out of date?)",
__func__, pline);
goto bottom;
}
if (*cp == '\0') {
cp = NULL;
goto bottom;
}
if (cmd == PLIST_COMMENT && sscanf(cp, "PKG_FORMAT_REVISION:%d.%d\n",
&major, &minor) == 2) {
pkg->fmtver_maj = major;
pkg->fmtver_mnr = minor;
if (verscmp(pkg, PLIST_FMT_VER_MAJOR, PLIST_FMT_VER_MINOR) <= 0)
goto bottom;
warnx("plist format revision (%d.%d) is higher than supported"
"(%d.%d)", pkg->fmtver_maj, pkg->fmtver_mnr,
PLIST_FMT_VER_MAJOR, PLIST_FMT_VER_MINOR);
if (pkg->fmtver_maj > PLIST_FMT_VER_MAJOR) {
cleanup(0);
exit(2);
}
}
bottom:
add_plist(pkg, cmd, cp);
}
}
/* Write a packing list to a file, converting commands to ascii equivs */
void
write_plist(Package *pkg, FILE *fp)
{
PackingList plist = pkg->head;
while (plist) {
switch(plist->type) {
case PLIST_FILE:
fprintf(fp, "%s\n", plist->name);
break;
case PLIST_CWD:
fprintf(fp, "%ccwd %s\n", CMD_CHAR, plist->name);
break;
case PLIST_SRC:
fprintf(fp, "%csrcdir %s\n", CMD_CHAR, plist->name);
break;
case PLIST_CMD:
fprintf(fp, "%cexec %s\n", CMD_CHAR, plist->name);
break;
case PLIST_UNEXEC:
fprintf(fp, "%cunexec %s\n", CMD_CHAR, plist->name);
break;
case PLIST_CHMOD:
fprintf(fp, "%cmode %s\n", CMD_CHAR, plist->name ? plist->name : "");
break;
case PLIST_CHOWN:
fprintf(fp, "%cowner %s\n", CMD_CHAR, plist->name ? plist->name : "");
break;
case PLIST_CHGRP:
fprintf(fp, "%cgroup %s\n", CMD_CHAR, plist->name ? plist->name : "");
break;
case PLIST_COMMENT:
fprintf(fp, "%ccomment %s\n", CMD_CHAR, plist->name);
break;
case PLIST_IGNORE:
case PLIST_IGNORE_INST: /* a one-time non-ignored file */
fprintf(fp, "%cignore\n", CMD_CHAR);
break;
case PLIST_NAME:
fprintf(fp, "%cname %s\n", CMD_CHAR, plist->name);
break;
case PLIST_DISPLAY:
fprintf(fp, "%cdisplay %s\n", CMD_CHAR, plist->name);
break;
case PLIST_PKGDEP:
fprintf(fp, "%cpkgdep %s\n", CMD_CHAR, plist->name);
break;
case PLIST_MTREE:
fprintf(fp, "%cmtree %s\n", CMD_CHAR, plist->name);
break;
case PLIST_DIR_RM:
fprintf(fp, "%cdirrm %s\n", CMD_CHAR, plist->name);
break;
case PLIST_OPTION:
fprintf(fp, "%coption %s\n", CMD_CHAR, plist->name);
break;
case PLIST_ORIGIN:
fprintf(fp, "%ccomment ORIGIN:%s\n", CMD_CHAR, plist->name);
break;
case PLIST_DEPORIGIN:
fprintf(fp, "%ccomment DEPORIGIN:%s\n", CMD_CHAR, plist->name);
break;
default:
cleanup(0);
errx(2, "%s: unknown command type %d (%s)", __func__,
plist->type, plist->name);
break;
}
plist = plist->next;
}
}
/*
* Delete the results of a package installation.
*
* This is here rather than in the pkg_delete code because pkg_add needs to
* run it too in cases of failure.
*/
int
delete_package(Boolean ign_err, Boolean nukedirs, Package *pkg)
{
PackingList p;
const char *Where = ".", *last_file = "";
Boolean fail = SUCCESS;
Boolean preserve;
char tmp[FILENAME_MAX], *name = NULL;
preserve = find_plist_option(pkg, "preserve") ? TRUE : FALSE;
for (p = pkg->head; p; p = p->next) {
switch (p->type) {
case PLIST_NAME:
name = p->name;
break;
case PLIST_IGNORE:
p = p->next;
break;
case PLIST_CWD:
Where = p->name;
if (Verbose)
printf("Change working directory to %s\n", Where);
break;
case PLIST_UNEXEC:
format_cmd(tmp, FILENAME_MAX, p->name, Where, last_file);
if (Verbose)
printf("Execute '%s'\n", tmp);
if (!Fake && system(tmp)) {
warnx("unexec command for '%s' failed", tmp);
fail = FAIL;
}
break;
case PLIST_FILE:
last_file = p->name;
sprintf(tmp, "%s/%s", Where, p->name);
if (isdir(tmp) && fexists(tmp) && !issymlink(tmp)) {
warnx("cannot delete specified file '%s' - it is a directory!\n"
"this packing list is incorrect - ignoring delete request", tmp);
}
else {
if (p->next && p->next->type == PLIST_COMMENT && !strncmp(p->next->name, "MD5:", 4)) {
char *cp = NULL, buf[33];
/*
* For packing lists whose version is 1.1 or greater, the md5
* hash for a symlink is calculated on the string returned
* by readlink().
*/
if (issymlink(tmp) && verscmp(pkg, 1, 0) > 0) {
int len;
char linkbuf[FILENAME_MAX];
if ((len = readlink(tmp, linkbuf, FILENAME_MAX)) > 0)
cp = MD5Data((unsigned char *)linkbuf, len, buf);
} else if (isfile(tmp) || verscmp(pkg, 1, 1) < 0)
cp = MD5File(tmp, buf);
if (cp != NULL) {
/* Mismatch? */
if (strcmp(cp, p->next->name + 4)) {
warnx("'%s' fails original MD5 checksum - %s",
tmp, Force ? "deleted anyway." : "not deleted.");
if (!Force) {
fail = FAIL;
continue;
}
}
}
}
if (Verbose)
printf("Delete file %s\n", tmp);
if (!Fake) {
if (delete_hierarchy(tmp, ign_err, nukedirs))
fail = FAIL;
if (preserve && name) {
char tmp2[FILENAME_MAX];
if (make_preserve_name(tmp2, FILENAME_MAX, name, tmp)) {
if (fexists(tmp2)) {
if (rename(tmp2, tmp))
warn("preserve: unable to restore %s as %s",
tmp2, tmp);
}
}
}
}
}
break;
case PLIST_DIR_RM:
sprintf(tmp, "%s/%s", Where, p->name);
if (!isdir(tmp) && fexists(tmp)) {
warnx("cannot delete specified directory '%s' - it is a file!\n"
"this packing list is incorrect - ignoring delete request", tmp);
}
else {
if (Verbose)
printf("Delete directory %s\n", tmp);
if (!Fake && delete_hierarchy(tmp, ign_err, FALSE)) {
warnx("unable to completely remove directory '%s'", tmp);
fail = FAIL;
}
}
last_file = p->name;
break;
default:
break;
}
}
return fail;
}
#ifdef DEBUG
#define RMDIR(dir) vsystem("%s %s", RMDIR_CMD, dir)
#define REMOVE(dir,ie) vsystem("%s %s%s", REMOVE_CMD, (ie ? "-f " : ""), dir)
#else
#define RMDIR rmdir
#define REMOVE(file,ie) (remove(file) && !(ie))
#endif
/* Selectively delete a hierarchy */
int
delete_hierarchy(const char *dir, Boolean ign_err, Boolean nukedirs)
{
char *cp1, *cp2;
cp1 = cp2 = strdup(dir);
if (!fexists(dir)) {
if (!ign_err)
warnx("%s '%s' doesn't really exist",
isdir(dir) ? "directory" : "file", dir);
return !ign_err;
}
else if (nukedirs) {
if (vsystem("%s -r%s %s", REMOVE_CMD, (ign_err ? "f" : ""), dir))
return 1;
}
else if (isdir(dir) && !issymlink(dir)) {
if (RMDIR(dir) && !ign_err)
return 1;
}
else {
if (REMOVE(dir, ign_err))
return 1;
}
if (!nukedirs)
return 0;
while (cp2) {
if ((cp2 = strrchr(cp1, '/')) != NULL)
*cp2 = '\0';
if (!isemptydir(dir))
return 0;
if (RMDIR(dir) && !ign_err) {
if (!fexists(dir))
warnx("directory '%s' doesn't really exist", dir);
else
return 1;
}
/* back up the pathname one component */
if (cp2) {
cp1 = strdup(dir);
}
}
return 0;
}
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