mech_krb5/profile/prof_init.c

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * prof_init.c --- routines that manipulate the user-visible profile_t
 *      object.
 */

#include "prof_int.h"

#include <stdio.h>
#include <string.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <errno.h>

#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
typedef int32_t prof_int32;

errcode_t KRB5_CALLCONV
profile_init(const_profile_filespec_t *files, profile_t *ret_profile)
{
    const_profile_filespec_t *fs;
    profile_t profile;
    prf_file_t  new_file, last = 0;
    errcode_t retval = 0;

    profile = malloc(sizeof(struct _profile_t));
    if (!profile)
        return ENOMEM;
    memset(profile, 0, sizeof(struct _profile_t));
    profile->magic = PROF_MAGIC_PROFILE;

    /*
     * If the filenames list is not specified or empty, return an empty
     * profile.
     */
    if ( files && !PROFILE_LAST_FILESPEC(*files) ) {
        for (fs = files; !PROFILE_LAST_FILESPEC(*fs); fs++) {
            retval = profile_open_file(*fs, &new_file);
            /* if this file is missing, skip to the next */
            if (retval == ENOENT || retval == EACCES || retval == EPERM) {
                continue;
            }
            if (retval) {
                profile_release(profile);
                return retval;
            }
            if (last)
                last->next = new_file;
            else
                profile->first_file = new_file;
            last = new_file;
        }
        /*
         * If last is still null after the loop, then all the files were
         * missing, so return the appropriate error.
         */
        if (!last) {
            profile_release(profile);
            return ENOENT;
        }
    }

    *ret_profile = profile;
    return 0;
}

#define COUNT_LINKED_LIST(COUNT, PTYPE, START, FIELD)   \
    {                                                   \
        size_t cll_counter = 0;                         \
        PTYPE cll_ptr = (START);                        \
        while (cll_ptr != NULL) {                       \
            cll_counter++;                              \
            cll_ptr = cll_ptr->FIELD;                   \
        }                                               \
        (COUNT) = cll_counter;                          \
    }

errcode_t KRB5_CALLCONV
profile_copy(profile_t old_profile, profile_t *new_profile)
{
    size_t size, i;
    const_profile_filespec_t *files;
    prf_file_t file;
    errcode_t err;

    /* The fields we care about are read-only after creation, so
       no locking is needed.  */
    COUNT_LINKED_LIST (size, prf_file_t, old_profile->first_file, next);
    files = malloc ((size+1) * sizeof(*files));
    if (files == NULL)
        return ENOMEM;
    for (i = 0, file = old_profile->first_file; i < size; i++, file = file->next)
        files[i] = file->data->filespec;
    files[size] = NULL;
    err = profile_init (files, new_profile);
    free (files);
    return err;
}

errcode_t KRB5_CALLCONV
profile_init_path(const_profile_filespec_list_t filepath,
                  profile_t *ret_profile)
{
    unsigned int n_entries;
    int i;
    unsigned int ent_len;
    const char *s, *t;
    profile_filespec_t *filenames;
    errcode_t retval;

    /* count the distinct filename components */
    for(s = filepath, n_entries = 1; *s; s++) {
        if (*s == ':')
            n_entries++;
    }

    /* the array is NULL terminated */
    filenames = (profile_filespec_t*) malloc((n_entries+1) * sizeof(char*));
    if (filenames == 0)
        return ENOMEM;

    /* measure, copy, and skip each one */
    for(s = filepath, i=0; (t = strchr(s, ':')) || (t=s+strlen(s)); s=t+1, i++) {
        ent_len = (unsigned int) (t-s);
        filenames[i] = (char*) malloc(ent_len + 1);
        if (filenames[i] == 0) {
            /* if malloc fails, free the ones that worked */
            while(--i >= 0) free(filenames[i]);
            free(filenames);
            return ENOMEM;
        }
        strncpy(filenames[i], s, ent_len);
        filenames[i][ent_len] = 0;
        if (*t == 0) {
            i++;
            break;
        }
    }
    /* cap the array */
    filenames[i] = 0;

    retval = profile_init((const_profile_filespec_t *) filenames,
                          ret_profile);

    /* count back down and free the entries */
    while(--i >= 0) free(filenames[i]);
    free(filenames);

    return retval;
}

errcode_t KRB5_CALLCONV
profile_is_writable(profile_t profile, int *writable)
{
    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return PROF_MAGIC_PROFILE;

    if (!writable)
        return EINVAL;

    if (profile->first_file)
        *writable = profile_file_is_writable(profile->first_file);

    return 0;
}

errcode_t KRB5_CALLCONV
profile_is_modified(profile_t profile, int *modified)
{
    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return PROF_MAGIC_PROFILE;

    if (!modified)
        return EINVAL;

    if (profile->first_file)
        *modified = (profile->first_file->data->flags & PROFILE_FILE_DIRTY);

    return 0;
}

errcode_t KRB5_CALLCONV
profile_flush(profile_t profile)
{
    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return PROF_MAGIC_PROFILE;

    if (profile->first_file)
        return profile_flush_file(profile->first_file);

    return 0;
}

errcode_t KRB5_CALLCONV
profile_flush_to_file(profile_t profile, const_profile_filespec_t outfile)
{
    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return PROF_MAGIC_PROFILE;

    if (profile->first_file)
        return profile_flush_file_to_file(profile->first_file,
                                          outfile);

    return 0;
}

errcode_t KRB5_CALLCONV
profile_flush_to_buffer(profile_t profile, char **buf)
{
    return profile_flush_file_data_to_buffer(profile->first_file->data, buf);
}

void KRB5_CALLCONV
profile_free_buffer(profile_t profile, char *buf)
{
    free(buf);
}

void KRB5_CALLCONV
profile_abandon(profile_t profile)
{
    prf_file_t      p, next;

    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return;

    for (p = profile->first_file; p; p = next) {
        next = p->next;
        profile_free_file(p);
    }
    profile->magic = 0;
    free(profile);
}

void KRB5_CALLCONV
profile_release(profile_t profile)
{
    prf_file_t      p, next;

    if (!profile || profile->magic != PROF_MAGIC_PROFILE)
        return;

    for (p = profile->first_file; p; p = next) {
        next = p->next;
        profile_close_file(p);
    }
    profile->magic = 0;
    free(profile);
}

/*
 * Here begins the profile serialization functions.
 */
errcode_t profile_ser_size(const char *unused, profile_t profile,
                           size_t *sizep)
{
    size_t      required;
    prf_file_t  pfp;

    required = 3*sizeof(prof_int32);
    for (pfp = profile->first_file; pfp; pfp = pfp->next) {
        required += sizeof(prof_int32);
        required += strlen(pfp->data->filespec);
    }
    *sizep += required;
    return 0;
}

static void pack_int32(prof_int32 oval, unsigned char **bufpp, size_t *remainp)
{
    store_32_be(oval, *bufpp);
    *bufpp += sizeof(prof_int32);
    *remainp -= sizeof(prof_int32);
}

errcode_t profile_ser_externalize(const char *unused, profile_t profile,
                                  unsigned char **bufpp, size_t *remainp)
{
    errcode_t           retval;
    size_t              required;
    unsigned char       *bp;
    size_t              remain;
    prf_file_t          pfp;
    prof_int32          fcount, slen;

    required = 0;
    bp = *bufpp;
    remain = *remainp;
    retval = EINVAL;
    if (profile) {
        retval = ENOMEM;
        (void) profile_ser_size(unused, profile, &required);
        if (required <= remain) {
            fcount = 0;
            for (pfp = profile->first_file; pfp; pfp = pfp->next)
                fcount++;
            pack_int32(PROF_MAGIC_PROFILE, &bp, &remain);
            pack_int32(fcount, &bp, &remain);
            for (pfp = profile->first_file; pfp; pfp = pfp->next) {
                slen = (prof_int32) strlen(pfp->data->filespec);
                pack_int32(slen, &bp, &remain);
                if (slen) {
                    memcpy(bp, pfp->data->filespec, (size_t) slen);
                    bp += slen;
                    remain -= (size_t) slen;
                }
            }
            pack_int32(PROF_MAGIC_PROFILE, &bp, &remain);
            retval = 0;
            *bufpp = bp;
            *remainp = remain;
        }
    }
    return(retval);
}

static int unpack_int32(prof_int32 *intp, unsigned char **bufpp,
                        size_t *remainp)
{
    if (*remainp >= sizeof(prof_int32)) {
        *intp = load_32_be(*bufpp);
        *bufpp += sizeof(prof_int32);
        *remainp -= sizeof(prof_int32);
        return 0;
    }
    else
        return 1;
}

errcode_t profile_ser_internalize(const char *unused, profile_t *profilep,
                                  unsigned char **bufpp, size_t *remainp)
{
    errcode_t               retval;
    unsigned char   *bp;
    size_t          remain;
    int                     i;
    prof_int32              fcount, tmp;
    profile_filespec_t              *flist = 0;

    bp = *bufpp;
    remain = *remainp;
    fcount = 0;

    if (remain >= 12)
        (void) unpack_int32(&tmp, &bp, &remain);
    else
        tmp = 0;

    if (tmp != PROF_MAGIC_PROFILE) {
        retval = EINVAL;
        goto cleanup;
    }

    (void) unpack_int32(&fcount, &bp, &remain);
    retval = ENOMEM;

    flist = (profile_filespec_t *) malloc(sizeof(profile_filespec_t) * (size_t) (fcount + 1));
    if (!flist)
        goto cleanup;

    memset(flist, 0, sizeof(char *) * (size_t) (fcount+1));
    for (i=0; i<fcount; i++) {
        if (!unpack_int32(&tmp, &bp, &remain)) {
            flist[i] = (char *) malloc((size_t) (tmp+1));
            if (!flist[i])
                goto cleanup;
            memcpy(flist[i], bp, (size_t) tmp);
            flist[i][tmp] = '\0';
            bp += tmp;
            remain -= (size_t) tmp;
        }
    }

    if (unpack_int32(&tmp, &bp, &remain) ||
        (tmp != PROF_MAGIC_PROFILE)) {
        retval = EINVAL;
        goto cleanup;
    }

    if ((retval = profile_init((const_profile_filespec_t *) flist,
                               profilep)))
        goto cleanup;

    *bufpp = bp;
    *remainp = remain;

cleanup:
    if (flist) {
        for (i=0; i<fcount; i++) {
            if (flist[i])
                free(flist[i]);
        }
        free(flist);
    }
    return(retval);
}

/*
 * Solaris Kerberos
 * profile_get_options_boolean() and profile_get_options_string() are Solaris
 * specific.
 */

errcode_t
profile_get_options_boolean(profile, section, options)
profile_t        profile;
char **        section;
profile_options_boolean *options;
{
    char ** actual_section;
    char * value = NULL;
    errcode_t retval = 0;
    int i, max_i;

    for (max_i = 0; section[max_i]; max_i++);
    if (actual_section = (char **)malloc((max_i + 2) * sizeof(char *))) {
        for (actual_section[max_i + 1] = NULL, i = 0; section[i]; i++)
            actual_section[i] = section[i];

        for (i = 0; options[i].name; i++) {
            if (options[i].found) continue;
            actual_section[max_i] = options[i].name;
            retval = profile_get_value(profile, (const char **) actual_section,
                                       (const char **)&value);
            if (retval && (retval != PROF_NO_RELATION) &&
                (retval != PROF_NO_SECTION)) {
                free(actual_section);
                return(retval);
            }
            if ((retval == 0) && value) {
                /*
                 * Any string other than true will turn off the
                 *option
                 */
                if (strncmp(value,"true",4) == 0)
                    *(options[i].value) = 1;
                else
                    *(options[i].value) = 0;
                options[i].found = 1;

            }
        }
        free(actual_section);
    } else {
        retval = ENOMEM;
    }
    return(retval);
}

errcode_t
profile_get_options_string(profile, section, options)
profile_t        profile;
char **        section;
profile_option_strings *options;
{
    char ** actual_section;
    char * value = NULL;
    errcode_t retval = 0;
    int i, max_i;

    for (max_i = 0; section[max_i]; max_i++);
    if (actual_section = (char **)malloc((max_i + 2) * sizeof(char *))) {
        for (actual_section[max_i + 1] = NULL, i = 0; section[i]; i++)
            actual_section[i] = section[i];

        for (i = 0; options[i].name; i++) {
            if (options[i].found) continue;
            actual_section[max_i] = options[i].name;
            retval = profile_get_value(profile, (const char **) actual_section,
                                       (const char **)&value);
            if (retval && (retval != PROF_NO_RELATION) &&
                (retval != PROF_NO_SECTION)) {
                free(actual_section);
                return(retval);
            }
            if ((retval == 0) && value) {
                *options[i].value = malloc(strlen(value)+1);
                if (*options[i].value == 0)
                    retval = ENOMEM;
                strcpy(*options[i].value, value);
                options[i].found = 1;
            } else
                *options[i].value = 0;
        }
        free(actual_section);
    } else {
        retval = ENOMEM;
    }
    return(retval);
}