/*
* 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 3 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, visit the http://fsf.org website.
*
* This is based on loadparm.c from Samba, written by Andrew Tridgell
* and Karl Auer. Some of the changes are:
*
* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2020 Wayne Davison
*/
/* Load parameters.
*
* This module provides suitable callback functions for the params
* module. It builds the internal table of section details which is
* then used by the rest of the server.
*
* To add a parameter:
*
* 1) add it to the global_vars or local_vars structure definition
* 2) add it to the parm_table
* 3) add it to the list of available functions (eg: using FN_GLOBAL_STRING())
* 4) initialise it in the Defaults static structure
*
* Notes:
* The configuration file is processed sequentially for speed. For this
* reason, there is a fair bit of sequence-dependent code here - ie., code
* which assumes that certain things happen before others. In particular, the
* code which happens at the boundary between sections is delicately poised,
* so be careful!
*/
#include "rsync.h"
#include "itypes.h"
#include "ifuncs.h"
#include "default-dont-compress.h"
extern item_list dparam_list;
#define strequal(a, b) (strcasecmp(a, b)==0)
#ifndef LOG_DAEMON
#define LOG_DAEMON 0
#endif
/* the following are used by loadparm for option lists */
typedef enum {
P_BOOL, P_BOOLREV, P_BOOL3, P_CHAR, P_INTEGER,
P_OCTAL, P_PATH, P_STRING, P_ENUM
} parm_type;
typedef enum {
P_LOCAL, P_GLOBAL, P_NONE
} parm_class;
struct enum_list {
int value;
char *name;
};
struct parm_struct {
char *label;
parm_type type;
parm_class class;
void *ptr;
struct enum_list *enum_list;
unsigned flags;
};
#ifndef GLOBAL_NAME
#define GLOBAL_NAME "global"
#endif
/* some helpful bits */
#define iSECTION(i) ((local_vars*)section_list.items)[i]
#define LP_SNUM_OK(i) ((i) >= 0 && (i) < (int)section_list.count)
#define SECTION_PTR(s, p) (((char*)(s)) + (ptrdiff_t)(((char*)(p))-(char*)&Vars.l))
/* Stack of "Vars" values used by the &include directive. */
static item_list Vars_stack = EMPTY_ITEM_LIST;
/* The array of section values that holds all the defined modules. */
static item_list section_list = EMPTY_ITEM_LIST;
static int iSectionIndex = -1;
static BOOL bInGlobalSection = True;
static struct enum_list enum_syslog_facility[] = {
#ifdef LOG_AUTH
{ LOG_AUTH, "auth" },
#endif
#ifdef LOG_AUTHPRIV
{ LOG_AUTHPRIV, "authpriv" },
#endif
#ifdef LOG_CRON
{ LOG_CRON, "cron" },
#endif
#ifdef LOG_DAEMON
{ LOG_DAEMON, "daemon" },
#endif
#ifdef LOG_FTP
{ LOG_FTP, "ftp" },
#endif
#ifdef LOG_KERN
{ LOG_KERN, "kern" },
#endif
#ifdef LOG_LPR
{ LOG_LPR, "lpr" },
#endif
#ifdef LOG_MAIL
{ LOG_MAIL, "mail" },
#endif
#ifdef LOG_NEWS
{ LOG_NEWS, "news" },
#endif
#ifdef LOG_AUTH
{ LOG_AUTH, "security" },
#endif
#ifdef LOG_SYSLOG
{ LOG_SYSLOG, "syslog" },
#endif
#ifdef LOG_USER
{ LOG_USER, "user" },
#endif
#ifdef LOG_UUCP
{ LOG_UUCP, "uucp" },
#endif
#ifdef LOG_LOCAL0
{ LOG_LOCAL0, "local0" },
#endif
#ifdef LOG_LOCAL1
{ LOG_LOCAL1, "local1" },
#endif
#ifdef LOG_LOCAL2
{ LOG_LOCAL2, "local2" },
#endif
#ifdef LOG_LOCAL3
{ LOG_LOCAL3, "local3" },
#endif
#ifdef LOG_LOCAL4
{ LOG_LOCAL4, "local4" },
#endif
#ifdef LOG_LOCAL5
{ LOG_LOCAL5, "local5" },
#endif
#ifdef LOG_LOCAL6
{ LOG_LOCAL6, "local6" },
#endif
#ifdef LOG_LOCAL7
{ LOG_LOCAL7, "local7" },
#endif
{ -1, NULL }
};
static struct enum_list enum_checksum_files[] = {
{ CSF_IGNORE_FILES, "none" },
{ CSF_LAX_MODE, "lax" },
{ CSF_STRICT_MODE, "strict" },
{ CSF_LAX_MODE|CSF_UPDATE, "+lax" },
{ CSF_STRICT_MODE|CSF_UPDATE, "+strict" },
{ CSF_LAX_MODE|CSF_UPDATE|CSF_AFFECT_DRYRUN, "++lax" },
{ CSF_STRICT_MODE|CSF_UPDATE|CSF_AFFECT_DRYRUN, "++strict" },
{ -1, NULL }
};
/* Expand %VAR% references. Any unknown vars or unrecognized
* syntax leaves the raw chars unchanged. */
static char *expand_vars(const char *str)
{
char *buf, *t;
const char *f;
int bufsize;
if (!str || !strchr(str, '%'))
return (char *)str; /* TODO change return value to const char* at some point. */
bufsize = strlen(str) + 2048;
buf = new_array(char, bufsize+1); /* +1 for trailing '\0' */
for (t = buf, f = str; bufsize && *f; ) {
if (*f == '%' && isUpper(f+1)) {
char *percent = strchr(f+1, '%');
if (percent && percent - f < bufsize) {
char *val;
strlcpy(t, f+1, percent - f);
val = getenv(t);
if (val) {
int len = strlcpy(t, val, bufsize+1);
if (len > bufsize)
break;
bufsize -= len;
t += len;
f = percent + 1;
continue;
}
}
}
*t++ = *f++;
bufsize--;
}
*t = '\0';
if (*f) {
rprintf(FLOG, "Overflowed buf in expand_vars() trying to expand: %s\n", str);
exit_cleanup(RERR_MALLOC);
}
if (bufsize && (buf = realloc(buf, t - buf + 1)) == NULL)
out_of_memory("expand_vars");
return buf;
}
/* Each "char* foo" has an associated "BOOL foo_EXP" that tracks if the string has been expanded yet or not. */
/* NOTE: use this function and all the FN_{GLOBAL,LOCAL} ones WITHOUT a trailing semicolon! */
#define RETURN_EXPANDED(val) {if (!val ## _EXP) {val = expand_vars(val); val ## _EXP = True;} return val ? val : "";}
/* In this section all the functions that are used to access the
* parameters from the rest of the program are defined. */
#define FN_GLOBAL_STRING(fn_name, val) \
char *fn_name(void) RETURN_EXPANDED(Vars.g.val)
#define FN_GLOBAL_BOOL(fn_name, val) \
BOOL fn_name(void) {return Vars.g.val;}
#define FN_GLOBAL_CHAR(fn_name, val) \
char fn_name(void) {return Vars.g.val;}
#define FN_GLOBAL_INTEGER(fn_name, val) \
int fn_name(void) {return Vars.g.val;}
#define FN_LOCAL_STRING(fn_name, val) \
char *fn_name(int i) {if (LP_SNUM_OK(i) && iSECTION(i).val) RETURN_EXPANDED(iSECTION(i).val) else RETURN_EXPANDED(Vars.l.val)}
#define FN_LOCAL_BOOL(fn_name, val) \
BOOL fn_name(int i) {return LP_SNUM_OK(i)? iSECTION(i).val : Vars.l.val;}
#define FN_LOCAL_CHAR(fn_name, val) \
char fn_name(int i) {return LP_SNUM_OK(i)? iSECTION(i).val : Vars.l.val;}
#define FN_LOCAL_INTEGER(fn_name, val) \
int fn_name(int i) {return LP_SNUM_OK(i)? iSECTION(i).val : Vars.l.val;}
/* The following include file contains:
*
* typedef global_vars - describes global (ie., server-wide) parameters.
* typedef local_vars - describes a single section.
* typedef all_vars - a combination of global_vars & local_vars.
* all_vars Defaults - the default values for all the variables.
* all_vars Vars - the currently configured values for all the variables.
* struct parm_struct parm_table - the strings & variables for the parser.
* FN_{LOCAL,GLOBAL}_{TYPE}() definition for all the lp_var_name() accessors.
*/
#include "daemon-parm.h"
/* Initialise the Default all_vars structure. */
void reset_daemon_vars(void)
{
memcpy(&Vars, &Defaults, sizeof Vars);
}
/* Assign a copy of v to *s. Handles NULL strings. We don't worry
* about overwriting a malloc'd string because the long-running
* (port-listening) daemon only loads the config file once, and the
* per-job (forked or xinitd-ran) daemon only re-reads the file at
* the start, so any lost memory is inconsequential. */
static inline void string_set(char **s, const char *v)
{
*s = v ? strdup(v) : NULL;
}
/* Copy local_vars into a new section. No need to strdup since we don't free. */
static void copy_section(local_vars *psectionDest, local_vars *psectionSource)
{
memcpy(psectionDest, psectionSource, sizeof psectionDest[0]);
}
/* Initialise a section to the defaults. */
static void init_section(local_vars *psection)
{
memset(psection, 0, sizeof (local_vars));
copy_section(psection, &Vars.l);
}
/* Do a case-insensitive, whitespace-ignoring string equality check. */
static int strwiEQ(char *psz1, char *psz2)
{
/* If one or both strings are NULL, we return equality right away. */
if (psz1 == psz2)
return 1;
if (psz1 == NULL || psz2 == NULL)
return 0;
/* sync the strings on first non-whitespace */
while (1) {
while (isSpace(psz1))
psz1++;
while (isSpace(psz2))
psz2++;
if (*psz1 == '\0' || *psz2 == '\0')
break;
if (toUpper(psz1) != toUpper(psz2))
break;
psz1++;
psz2++;
}
return *psz1 == *psz2;
}
/* Find a section by name. Otherwise works like get_section. */
static int getsectionbyname(char *name)
{
int i;
for (i = section_list.count - 1; i >= 0; i--) {
if (strwiEQ(iSECTION(i).name, name))
break;
}
return i;
}
/* Add a new section to the sections array w/the default values. */
static int add_a_section(char *name)
{
int i;
local_vars *s;
/* it might already exist */
if (name) {
i = getsectionbyname(name);
if (i >= 0)
return i;
}
i = section_list.count;
s = EXPAND_ITEM_LIST(§ion_list, local_vars, 2);
init_section(s);
if (name)
string_set(&s->name, name);
return i;
}
/* Map a parameter's string representation to something we can use.
* Returns False if the parameter string is not recognised, else TRUE. */
static int map_parameter(char *parmname)
{
int iIndex;
if (*parmname == '-')
return -1;
for (iIndex = 0; parm_table[iIndex].label; iIndex++) {
if (strwiEQ(parm_table[iIndex].label, parmname))
return iIndex;
}
rprintf(FLOG, "Unknown Parameter encountered: \"%s\"\n", parmname);
return -1;
}
/* Set a boolean variable from the text value stored in the passed string.
* Returns True in success, False if the passed string does not correctly
* represent a boolean. */
static BOOL set_boolean(BOOL *pb, char *parmvalue, int allow_unset)
{
if (strwiEQ(parmvalue, "yes") || strwiEQ(parmvalue, "true") || strwiEQ(parmvalue, "1"))
*pb = True;
else if (strwiEQ(parmvalue, "no") || strwiEQ(parmvalue, "false") || strwiEQ(parmvalue, "0"))
*pb = False;
else if (allow_unset && (strwiEQ(parmvalue, "unset") || strwiEQ(parmvalue, "-1")))
*pb = Unset;
else {
rprintf(FLOG, "Badly formed boolean in configuration file: \"%s\".\n", parmvalue);
return False;
}
return True;
}
/* Process a parameter. */
static BOOL do_parameter(char *parmname, char *parmvalue)
{
int parmnum, i;
void *parm_ptr; /* where we are going to store the result */
void *def_ptr;
char *cp;
parmnum = map_parameter(parmname);
if (parmnum < 0) {
rprintf(FLOG, "IGNORING unknown parameter \"%s\"\n", parmname);
return True;
}
def_ptr = parm_table[parmnum].ptr;
if (bInGlobalSection)
parm_ptr = def_ptr;
else {
if (parm_table[parmnum].class == P_GLOBAL) {
rprintf(FLOG, "Global parameter %s found in module section!\n", parmname);
return True;
}
parm_ptr = SECTION_PTR(&iSECTION(iSectionIndex), def_ptr);
}
/* now switch on the type of variable it is */
switch (parm_table[parmnum].type) {
case P_PATH:
case P_STRING:
/* delay expansion of %VAR% strings */
break;
default:
/* expand any %VAR% strings now */
parmvalue = expand_vars(parmvalue);
break;
}
switch (parm_table[parmnum].type) {
case P_BOOL:
set_boolean(parm_ptr, parmvalue, False);
break;
case P_BOOL3:
set_boolean(parm_ptr, parmvalue, True);
break;
case P_BOOLREV:
set_boolean(parm_ptr, parmvalue, False);
*(BOOL *)parm_ptr = ! *(BOOL *)parm_ptr;
break;
case P_INTEGER:
*(int *)parm_ptr = atoi(parmvalue);
break;
case P_CHAR:
*(char *)parm_ptr = *parmvalue;
break;
case P_OCTAL:
sscanf(parmvalue, "%o", (int *)parm_ptr);
break;
case P_PATH:
string_set(parm_ptr, parmvalue);
if ((cp = *(char**)parm_ptr) != NULL) {
int len = strlen(cp);
while (len > 1 && cp[len-1] == '/') len--;
cp[len] = '\0';
}
break;
case P_STRING:
string_set(parm_ptr, parmvalue);
break;
case P_ENUM:
for (i=0; parm_table[parmnum].enum_list[i].name; i++) {
if (strequal(parmvalue, parm_table[parmnum].enum_list[i].name)) {
*(int *)parm_ptr = parm_table[parmnum].enum_list[i].value;
break;
}
}
if (!parm_table[parmnum].enum_list[i].name) {
if (atoi(parmvalue) > 0)
*(int *)parm_ptr = atoi(parmvalue);
}
break;
}
return True;
}
/* Process a new section (rsync module).
* Returns True on success, False on failure. */
static BOOL do_section(char *sectionname)
{
BOOL isglobal;
if (*sectionname == ']') { /* A special push/pop/reset directive from params.c */
bInGlobalSection = 1;
if (strcmp(sectionname+1, "push") == 0) {
all_vars *vp = EXPAND_ITEM_LIST(&Vars_stack, all_vars, 2);
memcpy(vp, &Vars, sizeof Vars);
} else if (strcmp(sectionname+1, "pop") == 0
|| strcmp(sectionname+1, "reset") == 0) {
all_vars *vp = ((all_vars*)Vars_stack.items) + Vars_stack.count - 1;
if (!Vars_stack.count)
return False;
memcpy(&Vars, vp, sizeof Vars);
if (sectionname[1] == 'p')
Vars_stack.count--;
} else
return False;
return True;
}
isglobal = strwiEQ(sectionname, GLOBAL_NAME);
/* At the end of the global section, add any --dparam items. */
if (bInGlobalSection && !isglobal) {
if (!section_list.count)
set_dparams(0);
}
/* if we've just struck a global section, note the fact. */
bInGlobalSection = isglobal;
/* check for multiple global sections */
if (bInGlobalSection)
return True;
#if 0
/* If we have a current section, tidy it up before moving on. */
if (iSectionIndex >= 0) {
/* Add any tidy work as needed ... */
if (problem)
return False;
}
#endif
if (strchr(sectionname, '/') != NULL) {
rprintf(FLOG, "Warning: invalid section name in configuration file: %s\n", sectionname);
return False;
}
if ((iSectionIndex = add_a_section(sectionname)) < 0) {
rprintf(FLOG, "Failed to add a new module\n");
bInGlobalSection = True;
return False;
}
return True;
}
/* Load the modules from the config file. Return True on success,
* False on failure. */
int lp_load(char *pszFname, int globals_only)
{
bInGlobalSection = True;
reset_daemon_vars();
/* We get sections first, so have to start 'behind' to make up. */
iSectionIndex = -1;
return pm_process(pszFname, globals_only ? NULL : do_section, do_parameter);
}
BOOL set_dparams(int syntax_check_only)
{
char *equal, *val, **params = dparam_list.items;
unsigned j;
for (j = 0; j < dparam_list.count; j++) {
equal = strchr(params[j], '='); /* options.c verified this */
*equal = '\0';
if (syntax_check_only) {
if (map_parameter(params[j]) < 0) {
rprintf(FERROR, "Unknown parameter \"%s\"\n", params[j]);
*equal = '=';
return False;
}
} else {
for (val = equal+1; isSpace(val); val++) {}
do_parameter(params[j], val);
}
*equal = '=';
}
return True;
}
/* Return the max number of modules (sections). */
int lp_num_modules(void)
{
return section_list.count;
}
/* Return the number of the module with the given name, or -1 if it doesn't
* exist. Note that this is a DIFFERENT ANIMAL from the internal function
* getsectionbyname()! This works ONLY if all sections have been loaded,
* and does not copy the found section. */
int lp_number(char *name)
{
int i;
for (i = section_list.count - 1; i >= 0; i--) {
if (strcmp(lp_name(i), name) == 0)
break;
}
return i;
}
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