source: MondoRescue/branches/stable/mindi-busybox/archival/rpm.c@ 1770

/* vi: set sw=4 ts=4: */
/*
 * Mini rpm applet for busybox
 *
 * Copyright (C) 2001,2002 by Laurence Anderson
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include "unarchive.h"

#define RPM_HEADER_MAGIC        "\216\255\350"
#define RPM_CHAR_TYPE           1
#define RPM_INT8_TYPE           2
#define RPM_INT16_TYPE          3
#define RPM_INT32_TYPE          4
/* #define RPM_INT64_TYPE       5   ---- These aren't supported (yet) */
#define RPM_STRING_TYPE         6
#define RPM_BIN_TYPE            7
#define RPM_STRING_ARRAY_TYPE   8
#define RPM_I18NSTRING_TYPE     9

#define TAG_NAME                1000
#define TAG_VERSION             1001
#define TAG_RELEASE             1002
#define TAG_SUMMARY             1004
#define TAG_DESCRIPTION         1005
#define TAG_BUILDTIME           1006
#define TAG_BUILDHOST           1007
#define TAG_SIZE                1009
#define TAG_VENDOR              1011
#define TAG_LICENSE             1014
#define TAG_PACKAGER            1015
#define TAG_GROUP               1016
#define TAG_URL                 1020
#define TAG_PREIN               1023
#define TAG_POSTIN              1024
#define TAG_FILEFLAGS           1037
#define TAG_FILEUSERNAME        1039
#define TAG_FILEGROUPNAME       1040
#define TAG_SOURCERPM           1044
#define TAG_PREINPROG           1085
#define TAG_POSTINPROG          1086
#define TAG_PREFIXS             1098
#define TAG_DIRINDEXES          1116
#define TAG_BASENAMES           1117
#define TAG_DIRNAMES            1118
#define RPMFILE_CONFIG          (1 << 0)
#define RPMFILE_DOC             (1 << 1)

enum rpm_functions_e {
    rpm_query = 1,
    rpm_install = 2,
    rpm_query_info = 4,
    rpm_query_package = 8,
    rpm_query_list = 16,
    rpm_query_list_doc = 32,
    rpm_query_list_config = 64
};

typedef struct {
    uint32_t tag; /* 4 byte tag */
    uint32_t type; /* 4 byte type */
    uint32_t offset; /* 4 byte offset */
    uint32_t count; /* 4 byte count */
} rpm_index;

static void *map;
static rpm_index **mytags;
static int tagcount;

static void extract_cpio_gz(int fd);
static rpm_index **rpm_gettags(int fd, int *num_tags);
static int bsearch_rpmtag(const void *key, const void *item);
static char *rpm_getstr(int tag, int itemindex);
static int rpm_getint(int tag, int itemindex);
static int rpm_getcount(int tag);
static void fileaction_dobackup(char *filename, int fileref);
static void fileaction_setowngrp(char *filename, int fileref);
static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref));

int rpm_main(int argc, char **argv);
int rpm_main(int argc, char **argv)
{
    int opt = 0, func = 0, rpm_fd, offset;
    const int pagesize = getpagesize();

    while ((opt = getopt(argc, argv, "iqpldc")) != -1) {
        switch (opt) {
        case 'i': /* First arg: Install mode, with q: Information */
            if (!func) func = rpm_install;
            else func |= rpm_query_info;
            break;
        case 'q': /* First arg: Query mode */
            if (func) bb_show_usage();
            func = rpm_query;
            break;
        case 'p': /* Query a package */
            func |= rpm_query_package;
            break;
        case 'l': /* List files in a package */
            func |= rpm_query_list;
            break;
        case 'd': /* List doc files in a package (implies list) */
            func |= rpm_query_list;
            func |= rpm_query_list_doc;
            break;
        case 'c': /* List config files in a package (implies list) */
            func |= rpm_query_list;
            func |= rpm_query_list_config;
            break;
        default:
            bb_show_usage();
        }
    }
    argv += optind;
    argc -= optind;
    if (!argc) bb_show_usage();

    while (*argv) {
        rpm_fd = xopen(*argv++, O_RDONLY);
        mytags = rpm_gettags(rpm_fd, &tagcount);
        if (!mytags)
            bb_error_msg_and_die("error reading rpm header");
        offset = xlseek(rpm_fd, 0, SEEK_CUR);
        /* Mimimum is one page */
        map = mmap(0, offset > pagesize ? (offset + offset % pagesize) : pagesize, PROT_READ, MAP_PRIVATE, rpm_fd, 0);

        if (func & rpm_install) {
            /* Backup any config files */
            loop_through_files(TAG_BASENAMES, fileaction_dobackup);
            /* Extact the archive */
            extract_cpio_gz(rpm_fd);
            /* Set the correct file uid/gid's */
            loop_through_files(TAG_BASENAMES, fileaction_setowngrp);
        }
        else if ((func & (rpm_query|rpm_query_package)) == (rpm_query|rpm_query_package)) {
            if (!(func & (rpm_query_info|rpm_query_list))) {
                /* If just a straight query, just give package name */
                printf("%s-%s-%s\n", rpm_getstr(TAG_NAME, 0), rpm_getstr(TAG_VERSION, 0), rpm_getstr(TAG_RELEASE, 0));
            }
            if (func & rpm_query_info) {
                /* Do the nice printout */
                time_t bdate_time;
                struct tm *bdate;
                char bdatestring[50];
                printf("Name        : %-29sRelocations: %s\n", rpm_getstr(TAG_NAME, 0), rpm_getstr(TAG_PREFIXS, 0) ? rpm_getstr(TAG_PREFIXS, 0) : "(not relocateable)");
                printf("Version     : %-34sVendor: %s\n", rpm_getstr(TAG_VERSION, 0), rpm_getstr(TAG_VENDOR, 0) ? rpm_getstr(TAG_VENDOR, 0) : "(none)");
                bdate_time = rpm_getint(TAG_BUILDTIME, 0);
                bdate = localtime((time_t *) &bdate_time);
                strftime(bdatestring, 50, "%a %d %b %Y %T %Z", bdate);
                printf("Release     : %-30sBuild Date: %s\n", rpm_getstr(TAG_RELEASE, 0), bdatestring);
                printf("Install date: %-30sBuild Host: %s\n", "(not installed)", rpm_getstr(TAG_BUILDHOST, 0));
                printf("Group       : %-30sSource RPM: %s\n", rpm_getstr(TAG_GROUP, 0), rpm_getstr(TAG_SOURCERPM, 0));
                printf("Size        : %-33dLicense: %s\n", rpm_getint(TAG_SIZE, 0), rpm_getstr(TAG_LICENSE, 0));
                printf("URL         : %s\n", rpm_getstr(TAG_URL, 0));
                printf("Summary     : %s\n", rpm_getstr(TAG_SUMMARY, 0));
                printf("Description :\n%s\n", rpm_getstr(TAG_DESCRIPTION, 0));
            }
            if (func & rpm_query_list) {
                int count, it, flags;
                count = rpm_getcount(TAG_BASENAMES);
                for (it = 0; it < count; it++) {
                    flags = rpm_getint(TAG_FILEFLAGS, it);
                    switch (func & (rpm_query_list_doc|rpm_query_list_config)) {
                    case rpm_query_list_doc:
                        if (!(flags & RPMFILE_DOC)) continue;
                        break;
                    case rpm_query_list_config:
                        if (!(flags & RPMFILE_CONFIG)) continue;
                        break;
                    case rpm_query_list_doc|rpm_query_list_config:
                        if (!(flags & (RPMFILE_CONFIG|RPMFILE_DOC))) continue;
                        break;
                    }
                    printf("%s%s\n",
                        rpm_getstr(TAG_DIRNAMES, rpm_getint(TAG_DIRINDEXES, it)),
                        rpm_getstr(TAG_BASENAMES, it));
                }
            }
        }
        free(mytags);
    }
    return 0;
}

static void extract_cpio_gz(int fd)
{
    archive_handle_t *archive_handle;
    unsigned char magic[2];
#if BB_MMU
    USE_DESKTOP(long long) int (*xformer)(int src_fd, int dst_fd);
    enum { xformer_prog = 0 };
#else
    enum { xformer = 0 };
    const char *xformer_prog;
#endif

    /* Initialize */
    archive_handle = init_handle();
    archive_handle->seek = seek_by_read;
    //archive_handle->action_header = header_list;
    archive_handle->action_data = data_extract_all;
    archive_handle->flags |= ARCHIVE_PRESERVE_DATE;
    archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS;
    archive_handle->src_fd = fd;
    archive_handle->offset = 0;

    xread(archive_handle->src_fd, &magic, 2);
#if BB_MMU
    xformer = unpack_gz_stream;
#else
    xformer_prog = "gunzip";
#endif
    if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
        if (ENABLE_FEATURE_RPM_BZ2
         && (magic[0] == 0x42) && (magic[1] == 0x5a)) {
#if BB_MMU
            xformer = unpack_bz2_stream;
#else
            xformer_prog = "bunzip2";
#endif
    /* We can do better, need modifying unpack_bz2_stream to not require
     * first 2 bytes. Not very hard to do... I mean, TODO :) */
            xlseek(archive_handle->src_fd, -2, SEEK_CUR);
        } else
            bb_error_msg_and_die("no gzip"
                USE_FEATURE_RPM_BZ2("/bzip")
                " magic");
    } else {
        check_header_gzip_or_die(archive_handle->src_fd);
#if !BB_MMU
        /* NOMMU version of open_transformer execs an external unzipper that should
         * have the file position at the start of the file */
        xlseek(archive_handle->src_fd, 0, SEEK_SET);
#endif
    }

    xchdir("/"); /* Install RPM's to root */
    archive_handle->src_fd = open_transformer(archive_handle->src_fd, xformer, xformer_prog, xformer_prog, "-cf", "-", NULL);
    archive_handle->offset = 0;
    while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
        continue;
}


static rpm_index **rpm_gettags(int fd, int *num_tags)
{
    /* We should never need mode than 200, and realloc later */
    rpm_index **tags = xzalloc(200 * sizeof(struct rpmtag *));
    int pass, tagindex = 0;

    xlseek(fd, 96, SEEK_CUR); /* Seek past the unused lead */

    /* 1st pass is the signature headers, 2nd is the main stuff */
    for (pass = 0; pass < 2; pass++) {
        struct {
            char magic[3]; /* 3 byte magic: 0x8e 0xad 0xe8 */
            uint8_t version; /* 1 byte version number */
            uint32_t reserved; /* 4 bytes reserved */
            uint32_t entries; /* Number of entries in header (4 bytes) */
            uint32_t size; /* Size of store (4 bytes) */
        } header;
        rpm_index *tmpindex;
        int storepos;

        xread(fd, &header, sizeof(header));
        if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC, 3) != 0)
            return NULL; /* Invalid magic */
        if (header.version != 1)
            return NULL; /* This program only supports v1 headers */
        header.size = ntohl(header.size);
        header.entries = ntohl(header.entries);
        storepos = xlseek(fd,0,SEEK_CUR) + header.entries * 16;

        while (header.entries--) {
            tmpindex = tags[tagindex++] = xmalloc(sizeof(rpm_index));
            xread(fd, tmpindex, sizeof(rpm_index));
            tmpindex->tag = ntohl(tmpindex->tag);
            tmpindex->type = ntohl(tmpindex->type);
            tmpindex->count = ntohl(tmpindex->count);
            tmpindex->offset = storepos + ntohl(tmpindex->offset);
            if (pass==0)
                tmpindex->tag -= 743;
        }
        xlseek(fd, header.size, SEEK_CUR); /* Seek past store */
        /* Skip padding to 8 byte boundary after reading signature headers */
        if (pass==0)
            xlseek(fd, (8 - (xlseek(fd,0,SEEK_CUR) % 8)) % 8, SEEK_CUR);
    }
    tags = xrealloc(tags, tagindex * sizeof(struct rpmtag *)); /* realloc tags to save space */
    *num_tags = tagindex;
    return tags; /* All done, leave the file at the start of the gzipped cpio archive */
}

static int bsearch_rpmtag(const void *key, const void *item)
{
    int *tag = (int *)key;
    rpm_index **tmp = (rpm_index **) item;
    return (*tag - tmp[0]->tag);
}

static int rpm_getcount(int tag)
{
    rpm_index **found;
    found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
    if (!found)
        return 0;
    return found[0]->count;
}

static char *rpm_getstr(int tag, int itemindex)
{
    rpm_index **found;
    found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
    if (!found || itemindex >= found[0]->count)
        return NULL;
    if (found[0]->type == RPM_STRING_TYPE || found[0]->type == RPM_I18NSTRING_TYPE || found[0]->type == RPM_STRING_ARRAY_TYPE) {
        int n;
        char *tmpstr = (char *) (map + found[0]->offset);
        for (n=0; n < itemindex; n++)
            tmpstr = tmpstr + strlen(tmpstr) + 1;
        return tmpstr;
    }
    return NULL;
}

static int rpm_getint(int tag, int itemindex)
{
    rpm_index **found;
    int *tmpint; /* NB: using int8_t* would be easier to code */

    /* gcc throws warnings here when sizeof(void*)!=sizeof(int) ...
     * it's ok to ignore it because tag won't be used as a pointer */
    found = bsearch(&tag, mytags, tagcount, sizeof(struct rpmtag *), bsearch_rpmtag);
    if (!found || itemindex >= found[0]->count)
        return -1;

    tmpint = (int *) (map + found[0]->offset);

    if (found[0]->type == RPM_INT32_TYPE) {
        tmpint = (int *) ((char *) tmpint + itemindex*4);
        /*return ntohl(*tmpint);*/
        /* int can be != int32_t */
        return ntohl(*(int32_t*)tmpint);
    }
    if (found[0]->type == RPM_INT16_TYPE) {
        tmpint = (int *) ((char *) tmpint + itemindex*2);
        /* ??? read int, and THEN ntohs() it?? */
        /*return ntohs(*tmpint);*/
        return ntohs(*(int16_t*)tmpint);
    }
    if (found[0]->type == RPM_INT8_TYPE) {
        tmpint = (int *) ((char *) tmpint + itemindex);
        /* ??? why we don't read byte here??? */
        /*return ntohs(*tmpint);*/
        return *(int8_t*)tmpint;
    }
    return -1;
}

static void fileaction_dobackup(char *filename, int fileref)
{
    struct stat oldfile;
    int stat_res;
    char *newname;
    if (rpm_getint(TAG_FILEFLAGS, fileref) & RPMFILE_CONFIG) {
        /* Only need to backup config files */
        stat_res = lstat(filename, &oldfile);
        if (stat_res == 0 && S_ISREG(oldfile.st_mode)) {
            /* File already exists  - really should check MD5's etc to see if different */
            newname = xasprintf("%s.rpmorig", filename);
            copy_file(filename, newname, FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS);
            remove_file(filename, FILEUTILS_RECUR | FILEUTILS_FORCE);
            free(newname);
        }
    }
}

static void fileaction_setowngrp(char *filename, int fileref)
{
    int uid, gid;
    uid = xuname2uid(rpm_getstr(TAG_FILEUSERNAME, fileref));
    gid = xgroup2gid(rpm_getstr(TAG_FILEGROUPNAME, fileref));
    chown(filename, uid, gid);
}

static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref))
{
    int count = 0;
    while (rpm_getstr(filetag, count)) {
        char* filename = xasprintf("%s%s",
            rpm_getstr(TAG_DIRNAMES, rpm_getint(TAG_DIRINDEXES, count)),
            rpm_getstr(TAG_BASENAMES, count));
        fileaction(filename, count++);
        free(filename);
    }
}