SAMBA Project Documentation
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Chapter 29. Portability

Table of Contents
29.1. HPUX
29.2. SCO Unix
29.3. DNIX
29.4. RedHat Linux Rembrandt-II
29.5. AIX
29.6. Solaris

Samba works on a wide range of platforms but the interface all the platforms provide is not always compatible. This chapter contains platform-specific information about compiling and using samba.

29.1. HPUX

HP's implementation of supplementary groups is, er, non-standard (for hysterical reasons). There are two group files, /etc/group and /etc/logingroup; the system maps UIDs to numbers using the former, but initgroups() reads the latter. Most system admins who know the ropes symlink /etc/group to /etc/logingroup (hard link doesn't work for reasons too stupid to go into here). initgroups() will complain if one of the groups you're in in /etc/logingroup has what it considers to be an invalid ID, which means outside the range [0..UID_MAX], where UID_MAX is (I think) 60000 currently on HP-UX. This precludes -2 and 65534, the usual 'nobody' GIDs.

If you encounter this problem, make sure that the programs that are failing to initgroups() be run as users not in any groups with GIDs outside the allowed range.

This is documented in the HP manual pages under setgroups(2) and passwd(4).

On HPUX you must use gcc or the HP Ansi compiler. The free compiler that comes with HP-UX is not Ansi compliant and cannot compile Samba.

29.2. SCO Unix

If you run an old version of SCO Unix then you may need to get important TCP/IP patches for Samba to work correctly. Without the patch, you may encounter corrupt data transfers using samba.

The patch you need is UOD385 Connection Drivers SLS. It is available from SCO (ftp.sco.com, directory SLS, files uod385a.Z and uod385a.ltr.Z).

29.3. DNIX

DNIX has a problem with seteuid() and setegid(). These routines are needed for Samba to work correctly, but they were left out of the DNIX C library for some reason.

For this reason Samba by default defines the macro NO_EID in the DNIX section of includes.h. This works around the problem in a limited way, but it is far from ideal, some things still won't work right.

To fix the problem properly you need to assemble the following two functions and then either add them to your C library or link them into Samba.

put this in the file setegid.s:

        .globl  _setegid
_setegid:
        moveq   #47,d0
        movl    #100,a0
        moveq   #1,d1
        movl    4(sp),a1
        trap    #9
        bccs    1$
        jmp     cerror
1$:
        clrl    d0
        rts

put this in the file seteuid.s:

        .globl  _seteuid
_seteuid:
        moveq   #47,d0
        movl    #100,a0
        moveq   #0,d1
        movl    4(sp),a1
        trap    #9
        bccs    1$
        jmp     cerror
1$:
        clrl    d0
        rts

after creating the above files you then assemble them using

as seteuid.s

as setegid.s

that should produce the files seteuid.o and setegid.o

then you need to add these to the LIBSM line in the DNIX section of the Samba Makefile. Your LIBSM line will then look something like this:

LIBSM = setegid.o seteuid.o -ln

You should then remove the line:

#define NO_EID

from the DNIX section of includes.h

29.4. RedHat Linux Rembrandt-II

By default RedHat Rembrandt-II during installation adds an entry to /etc/hosts as follows: 

	127.0.0.1 loopback "hostname"."domainname"

This causes Samba to loop back onto the loopback interface. The result is that Samba fails to communicate correctly with the world and therefor may fail to correctly negotiate who is the master browse list holder and who is the master browser.

Corrective Action: Delete the entry after the word loopback in the line starting 127.0.0.1

29.5. AIX

29.5.1. Sequential Read Ahead

Disabling Sequential Read Ahead using vmtune -r 0 improves samba performance significally.

29.6. Solaris

Some people have been experiencing problems with F_SETLKW64/fcntl when running samba on solaris. The built in file locking mechanism was not scalable. Performance would degrade to the point where processes would get into loops of trying to lock a file. It woul try a lock, then fail, then try again. The lock attempt was failing before the grant was occurring. So the visible manifestation of this would be a handful of processes stealing all of the CPU, and when they were trussed they would be stuck if F_SETLKW64 loops.

Sun released patches for Solaris 2.6, 8, and 9. The patch for Solaris 7 has not been released yet.

The patch revision for 2.6 is 105181-34 for 8 is 108528-19 and for 9 is 112233-04

After the install of these patches it is recommended to reconfigure and rebuild samba.

Thanks to Joe Meslovich for reporting

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/*
 * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
 * Michael Clark <michael@metaparadigm.com>
 * Copyright (c) 2006 Derrell Lipman
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See COPYING for details.
 *
 * Derrell Lipman:
 * This version is modified from the original.  It has been modified to
 * natively use EJS variables rather than the original C object interface, and
 * to use the talloc() family of functions for memory allocation.
 */

#include "includes.h"
#include "scripting/ejs/smbcalls.h"

enum json_tokener_error {
        json_tokener_success,
        json_tokener_error_oom, /* out of memory */
        json_tokener_error_parse_unexpected,
        json_tokener_error_parse_null,
        json_tokener_error_parse_date,
        json_tokener_error_parse_boolean,
        json_tokener_error_parse_number,
        json_tokener_error_parse_array,
        json_tokener_error_parse_object,
        json_tokener_error_parse_string,
        json_tokener_error_parse_comment,
        json_tokener_error_parse_eof
};

enum json_tokener_state {
        json_tokener_state_eatws,
        json_tokener_state_start,
        json_tokener_state_finish,
        json_tokener_state_null,
        json_tokener_state_date,
        json_tokener_state_comment_start,
        json_tokener_state_comment,
        json_tokener_state_comment_eol,
        json_tokener_state_comment_end,
        json_tokener_state_string,
        json_tokener_state_string_escape,
        json_tokener_state_escape_unicode,
        json_tokener_state_boolean,
        json_tokener_state_number,
        json_tokener_state_array,
        json_tokener_state_datelist,
        json_tokener_state_array_sep,
        json_tokener_state_datelist_sep,
        json_tokener_state_object,
        json_tokener_state_object_field_start,
        json_tokener_state_object_field,
        json_tokener_state_object_field_end,
        json_tokener_state_object_value,
        json_tokener_state_object_sep
};

enum date_field {
        date_field_year,
        date_field_month,
        date_field_day,
        date_field_hour,
        date_field_minute,
        date_field_second,
        date_field_millisecond
};

struct json_tokener
{
        char *source;
        int pos;
        void *ctx;
        void *pb;
};

static const char *json_number_chars = "0123456789.+-e";
static const char *json_hex_chars = "0123456789abcdef";

#define hexdigit(x) (((x) <= '9') ? (x) - '0' : ((x) & 7) + 9)

extern struct MprVar json_tokener_parse(char *s);
static struct MprVar json_tokener_do_parse(struct json_tokener *this,
                                           enum json_tokener_error *err_p);

/*
 * literal_to_var() parses a string into an ejs variable.  The ejs
 * variable is returned.  Upon error, the javascript variable will be
 * `undefined`.  This was created for parsing JSON, but is generally useful
 * for parsing the literal forms of objects and arrays, since ejs doesn't
 * procide that functionality.
 */
int literal_to_var(int eid, int argc, char **argv)
{
        struct json_tokener tok;
        struct MprVar obj;
        enum json_tokener_error err = json_tokener_success;
        
        if (argc != 1) {
		ejsSetErrorMsg(eid,
                               "literal_to_var() requires one parameter: "
                               "the string to be parsed.");
		return -1;
        }

        tok.source = argv[0];
        tok.pos = 0;
        tok.ctx = talloc_new(mprMemCtx());
        if (tok.ctx == NULL) {
                mpr_Return(eid, mprCreateUndefinedVar());
                return 0;
        }
        tok.pb = talloc_zero_size(tok.ctx, 1);
        if (tok.pb == NULL) {
                mpr_Return(eid, mprCreateUndefinedVar());
                return 0;
        }
        obj = json_tokener_do_parse(&tok, &err);
        talloc_free(tok.pb);
        if (err != json_tokener_success) {
                mprDestroyVar(&obj);
                mpr_Return(eid, mprCreateUndefinedVar());
                return 0;
        }
        mpr_Return(eid, obj);
        return 0;
}

static void *append_string(void *ctx,
                           char *orig,
                           char *append,
                           int size)
{
    char c;
    char *end_p = append + size;
    void *ret;

    /*
     * We need to null terminate the string to be copied.  Save character at
     * the size limit of the source string.
     */
    c = *end_p;

    /* Temporarily null-terminate it */
    *end_p = '\0';

    /* Append the requested data */
    ret = talloc_append_string(ctx, orig, append);
    
    /* Restore the original character in place of our temporary null byte */
    *end_p = c;

    /* Give 'em what they came for */
    return ret;
}


static struct MprVar json_tokener_do_parse(struct json_tokener *this,
                                           enum json_tokener_error *err_p)
{
        enum json_tokener_state state;
        enum json_tokener_state saved_state;
        enum date_field date_field;
        struct MprVar current = mprCreateUndefinedVar();
        struct MprVar tempObj;
        struct MprVar obj;
        enum json_tokener_error err = json_tokener_success;
        char date_script[] = "JSON_Date.create(0);";
        char *obj_field_name = NULL;
        char *emsg = NULL;
        char quote_char;
        int deemed_double;
        int start_offset;
        char c;
        
        state = json_tokener_state_eatws;
        saved_state = json_tokener_state_start;

        
        do {
                c = this->source[this->pos];
                switch(state) {
                        
                case json_tokener_state_eatws:
                        if(isspace(c)) {
                                this->pos++;
                        } else if(c == '/') {
                                state = json_tokener_state_comment_start;
                                start_offset = this->pos++;
                        } else {
                                state = saved_state;
                        }
                        break;
                        
                case json_tokener_state_start:
                        switch(c) {
                        case '{':
                                state = json_tokener_state_eatws;
                                saved_state = json_tokener_state_object;
                                current = mprObject(NULL);
                                this->pos++;
                                break;
                        case '[':
                                state = json_tokener_state_eatws;
                                saved_state = json_tokener_state_array;
                                current = mprArray(NULL);
                                this->pos++;
                                break;
                        case 'N':
                        case 'n':
                                start_offset = this->pos++;
                                if (this->source[this->pos] == 'e') {
                                    state = json_tokener_state_date;
                                } else {
                                    state = json_tokener_state_null;
                                }
                                break;
                        case '"':
                        case '\'':
                                quote_char = c;
                                talloc_free(this->pb);
                                this->pb = talloc_zero_size(this->ctx, 1);
                                if (this->pb == NULL) {
                                        *err_p = json_tokener_error_oom;
                                        goto out;
                                }
                                state = json_tokener_state_string;
                                start_offset = ++this->pos;
                                break;
                        case 'T':
                        case 't':
                        case 'F':
                        case 'f':
                                state = json_tokener_state_boolean;
                                start_offset = this->pos++;
                                break;
#if defined(__GNUC__)
                        case '0' ... '9':
#else
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
#endif
                        case '-':
                                deemed_double = 0;
                                state = json_tokener_state_number;
                                start_offset = this->pos++;
                                break;
                        default:
                                err = json_tokener_error_parse_unexpected;
                                goto out;
                        }
                        break;
                        
                case json_tokener_state_finish:
                        goto out;
                        
                case json_tokener_state_null:
                        if(strncasecmp("null",
                                       this->source + start_offset,
                                       this->pos - start_offset)) {
                                *err_p = json_tokener_error_parse_null;
                                mprDestroyVar(&current);
                                return mprCreateUndefinedVar();
                        }
                        
                        if(this->pos - start_offset == 4) {
                                mprDestroyVar(&current);
                                current = mprCreateNullVar();
                                saved_state = json_tokener_state_finish;
                                state = json_tokener_state_eatws;
                        } else {
                                this->pos++;
                        }
                        break;
                        
                case json_tokener_state_date:
                        if (this->pos - start_offset <= 18) {
                                if (strncasecmp("new Date(Date.UTC(",
                                                this->source + start_offset,
                                                this->pos - start_offset)) {
                                        *err_p = json_tokener_error_parse_date;
                                        mprDestroyVar(&current);
                                        return mprCreateUndefinedVar();
                                } else {
                                        this->pos++;
                                        break;
                                }
                        }
                        
                        this->pos--;            /* we went one too far */
                        state = json_tokener_state_eatws;
                        saved_state = json_tokener_state_datelist;

                        /* Create a JsonDate object */
                        if (ejsEvalScript(0,
                                          date_script,
                                          &tempObj,
                                          &emsg) != 0) {
                                *err_p = json_tokener_error_parse_date;
                                mprDestroyVar(&current);
                                return mprCreateUndefinedVar();
                        }
                        mprDestroyVar(&current);
                        mprCopyVar(&current, &tempObj, MPR_DEEP_COPY);
                        date_field = date_field_year;
                        break;
                        
                case json_tokener_state_comment_start:
                        if(c == '*') {
                                state = json_tokener_state_comment;
                        } else if(c == '/') {
                                state = json_tokener_state_comment_eol;