usr.bin/rdist/docmd.c

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 */
#pragma ident   "%Z%%M% %I% %E% SMI"

#include "defs.h"
#include <string.h>
#include <setjmp.h>
#include <netdb.h>
#include <signal.h>
#include <krb5defs.h>

#ifndef RDIST
#ifdef SYSV
/*
 * Historically, the rdist program has had the following hard-coded
 * pathname.  Some operating systems attempt to "improve" the
 * directory layout, in the process re-locating the rdist binary
 * to some other location.  However, the first original implementation
 * sets a standard of sorts.  In order to interoperate with other
 * systems, our implementation must do two things: It must provide
 * the an rdist binary at the pathname below, and it must use this
 * pathname when executing rdist on remote systems via the rcmd()
 * library.  Thus the hard-coded path name below can never be changed.
 */
#endif /* SYSV */
#define RDIST "/usr/ucb/rdist"
#endif

FILE    *lfp;           /* log file for recording files updated */
struct  subcmd *subcmds;    /* list of sub-commands for current cmd */
jmp_buf env;

void    cleanup();
void    lostconn();
static int  init_service(int);
static struct servent *sp;

static void notify(char *file, char *rhost, struct namelist *to, time_t lmod);
static void rcmptime(struct stat *st);
static void cmptime(char *name);
static void dodcolon(char **filev, struct namelist *files, char *stamp,
    struct subcmd *cmds);
static void closeconn(void);
static void doarrow(char **filev, struct namelist *files, char *rhost,
    struct subcmd *cmds);
static int makeconn(char *rhost);
static int okname(register char *name);

#ifdef SYSV
#include <libgen.h>

static char *recomp;
static char *errstring = "regcmp failed for some unknown reason";

char *
re_comp(s)
char *s;
{
    if ((int)recomp != 0)
        free(recomp);
    recomp = regcmp(s, (char *)0);
    if (recomp == NULL)
        return (errstring);
    else
        return ((char *)0);
}


static int
re_exec(s)
char *s;
{
    if ((int)recomp == 0)
        return (-1);
    if (regex(recomp, s) == NULL)
        return (0);
    else
        return (1);
}
#endif /* SYSV */

/*
 * Do the commands in cmds (initialized by yyparse).
 */
void
docmds(dhosts, argc, argv)
    char **dhosts;
    int argc;
    char **argv;
{
    register struct cmd *c;
    register struct namelist *f;
    register char **cpp;
    extern struct cmd *cmds;

    /* protect backgrounded rdist */
    if (signal(SIGINT, SIG_IGN) != SIG_IGN)
        (void) signal(SIGINT, cleanup);

    /* ... and running via nohup(1) */
    if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
        (void) signal(SIGHUP, cleanup);
    if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
        (void) signal(SIGQUIT, cleanup);

    (void) signal(SIGTERM, cleanup);

if (debug)
    if (!cmds)
        printf("docmds:  cmds == NULL\n");
    else {
        printf("docmds:  cmds ");
        prcmd(cmds);
    }
    for (c = cmds; c != NULL; c = c->c_next) {
        if (dhosts != NULL && *dhosts != NULL) {
            for (cpp = dhosts; *cpp; cpp++)
                if (strcmp(c->c_name, *cpp) == 0)
                    goto fndhost;
            continue;
        }
    fndhost:
        if (argc) {
            for (cpp = argv; *cpp; cpp++) {
                if (c->c_label != NULL &&
                    strcmp(c->c_label, *cpp) == 0) {
                    cpp = NULL;
                    goto found;
                }
                for (f = c->c_files; f != NULL; f = f->n_next)
                    if (strcmp(f->n_name, *cpp) == 0)
                        goto found;
            }
            continue;
        } else
            cpp = NULL;
    found:
        switch (c->c_type) {
        case ARROW:
            doarrow(cpp, c->c_files, c->c_name, c->c_cmds);
            break;
        case DCOLON:
            dodcolon(cpp, c->c_files, c->c_name, c->c_cmds);
            break;
        default:
            fatal("illegal command type %d\n", c->c_type);
        }
    }
    closeconn();
}

/*
 * Process commands for sending files to other machines.
 */
static void
doarrow(filev, files, rhost, cmds)
    char **filev;
    struct namelist *files;
    char *rhost;
    struct subcmd *cmds;
{
    register struct namelist *f;
    register struct subcmd *sc;
    register char **cpp;
    int n, ddir, opts = options;

    if (debug)
        printf("doarrow(%x, %s, %x)\n", files, rhost, cmds);

    if (files == NULL) {
        error("no files to be updated\n");
        return;
    }

    subcmds = cmds;
    ddir = files->n_next != NULL;   /* destination is a directory */
    if (nflag)
        printf("updating host %s\n", rhost);
    else {
        if (setjmp(env))
            goto done;
        (void) signal(SIGPIPE, lostconn);
        if (!makeconn(rhost))
            return;
        if (!nflag)
            if ((lfp = fopen(Tmpfile, "w")) == NULL) {
                fatal("cannot open %s\n", Tmpfile);
                exit(1);
            }
    }
    for (f = files; f != NULL; f = f->n_next) {
        if (filev) {
            for (cpp = filev; *cpp; cpp++)
                if (strcmp(f->n_name, *cpp) == 0)
                    goto found;
            continue;
        }
    found:
        n = 0;
        for (sc = cmds; sc != NULL; sc = sc->sc_next) {
            if (sc->sc_type != INSTALL)
                continue;
            n++;
            install(f->n_name, sc->sc_name,
                sc->sc_name == NULL ? 0 : ddir, sc->sc_options);
            opts = sc->sc_options;
        }
        if (n == 0)
            install(f->n_name, NULL, 0, options);
    }
done:
    if (!nflag) {
        (void) signal(SIGPIPE, cleanup);
        (void) fclose(lfp);
        lfp = NULL;
    }
    for (sc = cmds; sc != NULL; sc = sc->sc_next)
        if (sc->sc_type == NOTIFY)
            notify(Tmpfile, rhost, sc->sc_args, 0);
    if (!nflag) {
        (void) unlink(Tmpfile);
        for (; ihead != NULL; ihead = ihead->nextp) {
            free(ihead);
            if ((opts & IGNLNKS) || ihead->count == 0)
                continue;
            log(lfp, "%s: Warning: missing links\n",
                ihead->pathname);
        }
    }
}

static int
init_service(int krb5flag)
{
    boolean_t success = B_FALSE;

    if (krb5flag > 0) {
        if ((sp = getservbyname("kshell", "tcp")) == NULL) {
            fatal("kshell/tcp: unknown service");
            (void) fprintf(stderr,
                gettext("trying shell/tcp service...\n"));
        } else {
            success = B_TRUE;
        }
    } else {
        if ((sp = getservbyname("shell", "tcp")) == NULL) {
            fatal("shell/tcp: unknown service");
            exit(1);
        } else {
            success = B_TRUE;
        }
    }
    return (success);
}
/*
 * Create a connection to the rdist server on the machine rhost.
 */
static int
makeconn(rhost)
    char *rhost;
{
    register char *ruser, *cp;
    static char *cur_host = NULL;
    static int port = -1;
    char tuser[20];
    int n;
    extern char user[];

    if (debug)
        printf("makeconn(%s)\n", rhost);

    if (cur_host != NULL && rem >= 0) {
        if (strcmp(cur_host, rhost) == 0)
            return (1);
        closeconn();
    }
    cur_host = rhost;
    cp = index(rhost, '@');
    if (cp != NULL) {
        char c = *cp;

        *cp = '\0';
        strncpy(tuser, rhost, sizeof (tuser)-1);
        *cp = c;
        rhost = cp + 1;
        ruser = tuser;
        if (*ruser == '\0')
            ruser = user;
        else if (!okname(ruser))
            return (0);
    } else
        ruser = user;
    if (!qflag)
        printf("updating host %s\n", rhost);
    (void) snprintf(buf, RDIST_BUFSIZ, "%s%s -Server%s",
            encrypt_flag ? "-x " : "", RDIST, qflag ? " -q" : "");
    if (port < 0) {
        if (debug_port == 0) {
            if ((retval = (int)init_service(krb5auth_flag)) == 0) {
                krb5auth_flag = encrypt_flag = 0;
                (void) init_service(krb5auth_flag);
            }
            port = sp->s_port;

        } else {
            port = debug_port;
        }
    }

    if (debug) {
        printf("port = %d, luser = %s, ruser = %s\n", ntohs(port),
            user, ruser);
        printf("buf = %s\n", buf);
    }

    fflush(stdout);

    if (krb5auth_flag > 0) {
        if ((encrypt_flag > 0) && (!krb5_privacy_allowed())) {
            (void) fprintf(stderr, gettext("rdist: Encryption "
                    " not supported.\n"));
            exit(1);
        }

        authopts = AP_OPTS_MUTUAL_REQUIRED;

        status = kcmd(&rem, &rhost, port,
                user, ruser,
                buf, 0, "host", krb_realm,
                bsd_context,
                &auth_context,
                &cred,
                0,  /* No need for sequence number */
                0,  /* No need for server seq # */
                authopts,
                1,  /* Always set anyport */
                &kcmd_proto);
        if (status) {
            /*
             * If new protocol requested, we dont
             * fallback to less secure ones.
             */
            if (kcmd_proto == KCMD_NEW_PROTOCOL) {
                (void) fprintf(stderr, gettext("rdist: kcmdv2 "
                    "to host %s failed - %s\n"
                    "Fallback to normal rdist denied."),
                    host, error_message(status));
                exit(1);
            }
            /* check NO_TKT_FILE or equivalent... */
            if (status != -1) {
                (void) fprintf(stderr, gettext("rdist: "
                "kcmd to host %s failed - %s\n"
                "trying normal rdist...\n\n"),
                host, error_message(status));
            } else {
                (void) fprintf(stderr,
                    gettext("trying normal rdist...\n"));
            }
            /*
             * kcmd() failed, so we now fallback to normal rdist
             */
            krb5auth_flag = encrypt_flag = 0;
            (void) init_service(krb5auth_flag);
            port = sp->s_port;
            goto do_rcmd;
        }
#ifdef DEBUG
        else {
            (void) fprintf(stderr, gettext("Kerberized rdist "
                    "session, port %d in use "), port);
            if (kcmd_proto == KCMD_OLD_PROTOCOL)
                (void) fprintf(stderr,
                        gettext("[kcmd ver.1].\n"));
            else
                (void) fprintf(stderr,
                        gettext("[kcmd ver.2].\n"));
        }
#endif /* DEBUG */
        session_key = &cred->keyblock;

        if (kcmd_proto == KCMD_NEW_PROTOCOL) {
            status = krb5_auth_con_getlocalsubkey(bsd_context,
                                auth_context,
                                &session_key);
            if (status) {
                com_err("rdist", status,
                    "determining subkey for session");
                exit(1);
            }
            if (!session_key) {
                com_err("rdist", 0,
                "no subkey negotiated for connection");
                exit(1);
            }
        }

        eblock.crypto_entry = session_key->enctype;
        eblock.key = (krb5_keyblock *)session_key;

        init_encrypt(encrypt_flag, bsd_context, kcmd_proto, &desinbuf,
                &desoutbuf, CLIENT, &eblock);


        if (encrypt_flag > 0) {
            char *s = gettext("This rdist session is using "
                "encryption for all data transmissions.\r\n");
            (void) write(2, s, strlen(s));
        }

    }
    else
do_rcmd:
    {
        rem = rcmd_af(&rhost, port, user, ruser, buf, 0, AF_INET6);
    }

    if (rem < 0)
        return (0);

    cp = buf;
    if (desread(rem, cp, 1, 0) != 1)
        lostconn();
    if (*cp == 'V') {
        do {
            if (desread(rem, cp, 1, 0) != 1)
                lostconn();
        } while (*cp++ != '\n' && cp < &buf[RDIST_BUFSIZ]);
        *--cp = '\0';
        cp = buf;
        n = 0;
        while (*cp >= '0' && *cp <= '9')
            n = (n * 10) + (*cp++ - '0');
        if (*cp == '\0' && n == VERSION)
            return (1);
        error("connection failed: version numbers don't match"
            " (local %d, remote %d)\n", VERSION, n);
    } else {
        error("connection failed: version numbers don't match\n");
    }
    closeconn();
    return (0);
}

/*
 * Signal end of previous connection.
 */
static void
closeconn(void)
{
    if (debug)
        printf("closeconn()\n");

    if (rem >= 0) {
        (void) deswrite(rem, "\2\n", 2, 0);
        (void) close(rem);
        rem = -1;
    }
}

void
lostconn()
{
    if (iamremote)
        cleanup();
    log(lfp, "rdist: lost connection\n");
    longjmp(env, 1);
}

static int
okname(name)
    register char *name;
{
    register char *cp = name;
    register int c;

    do {
        c = *cp;
        if (c & 0200)
            goto bad;
        if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
            goto bad;
        cp++;
    } while (*cp);
    return (1);
bad:
    error("invalid user name %s\n", name);
    return (0);
}

time_t  lastmod;
FILE    *tfp;
extern  char target[], *tp;

/*
 * Process commands for comparing files to time stamp files.
 */
static void
dodcolon(filev, files, stamp, cmds)
    char **filev;
    struct namelist *files;
    char *stamp;
    struct subcmd *cmds;
{
    register struct subcmd *sc;
    register struct namelist *f;
    register char **cpp;
    struct timeval tv[2];
    struct stat stb;

    if (debug)
        printf("dodcolon()\n");

    if (files == NULL) {
        error("no files to be updated\n");
        return;
    }
    if (stat(stamp, &stb) < 0) {
        error("%s: %s\n", stamp, strerror(errno));
        return;
    }
    if (debug)
        printf("%s: %d\n", stamp, stb.st_mtime);

    subcmds = cmds;
    lastmod = stb.st_mtime;
    if (nflag || (options & VERIFY))
        tfp = NULL;
    else {
        if ((tfp = fopen(Tmpfile, "w")) == NULL) {
            error("%s: %s\n", stamp, strerror(errno));
            return;
        }
        (void) gettimeofday(&tv[0], (struct timezone *)NULL);
        tv[1] = tv[0];
        (void) utimes(stamp, tv);
    }

    for (f = files; f != NULL; f = f->n_next) {
        if (filev) {
            for (cpp = filev; *cpp; cpp++)
                if (strcmp(f->n_name, *cpp) == 0)
                    goto found;
            continue;
        }
    found:
        tp = NULL;
        cmptime(f->n_name);
    }

    if (tfp != NULL)
        (void) fclose(tfp);
    for (sc = cmds; sc != NULL; sc = sc->sc_next)
        if (sc->sc_type == NOTIFY)
            notify(Tmpfile, NULL, sc->sc_args, lastmod);
    if (!nflag && !(options & VERIFY))
        (void) unlink(Tmpfile);
}

/*
 * Compare the mtime of file to the list of time stamps.
 */
static void
cmptime(name)
    char *name;
{
    struct stat stb;

    if (debug)
        printf("cmptime(%s)\n", name);

    if (except(name))
        return;

    if (nflag) {
        printf("comparing dates: %s\n", name);
        return;
    }

    /*
     * first time cmptime() is called?
     */
    if (tp == NULL) {
        if (exptilde(target, RDIST_BUFSIZ, name) == NULL)
            return;
        tp = name = target;
        while (*tp)
            tp++;
    }
    if (access(name, 4) < 0 || stat(name, &stb) < 0) {
        error("%s: %s\n", name, strerror(errno));
        return;
    }

    switch (stb.st_mode & S_IFMT) {
    case S_IFREG:
        break;

    case S_IFDIR:
        rcmptime(&stb);
        return;

    default:
        error("%s: not a plain file\n", name);
        return;
    }

    if (stb.st_mtime > lastmod)
        log(tfp, "new: %s\n", name);
}

static void
rcmptime(st)
    struct stat *st;
{
    register DIR *d;
    register struct dirent *dp;
    register char *cp;
    char *otp;
    int len;

    if (debug)
        printf("rcmptime(%x)\n", st);

    if ((d = opendir(target)) == NULL) {
        error("%s: %s\n", target, strerror(errno));
        return;
    }
    otp = tp;
    len = tp - target;
    while (dp = readdir(d)) {
        if ((strcmp(dp->d_name, ".") == 0) ||
            (strcmp(dp->d_name, "..") == 0))
            continue;
        if (len + 1 + strlen(dp->d_name) >= RDIST_BUFSIZ - 1) {
            error("%s/%s: Name too long\n", target, dp->d_name);
            continue;
        }
        tp = otp;
        *tp++ = '/';
        cp = dp->d_name;
        while (*tp++ = *cp++)
            ;
        tp--;
        cmptime(target);
    }
    closedir(d);
    tp = otp;
    *tp = '\0';
}

/*
 * Notify the list of people the changes that were made.
 * rhost == NULL if we are mailing a list of changes compared to at time
 * stamp file.
 */
static void
notify(file, rhost, to, lmod)
    char *file, *rhost;
    register struct namelist *to;
    time_t lmod;
{
    register int fd, len;
    FILE *pf, *popen();
    struct stat stb;

    if ((options & VERIFY) || to == NULL)
        return;
    if (!qflag) {
        printf("notify ");
        if (rhost)
            printf("@%s ", rhost);
        prnames(to);
    }
    if (nflag)
        return;

    if ((fd = open(file, 0)) < 0) {
        error("%s: %s\n", file, strerror(errno));
        return;
    }
    if (fstat(fd, &stb) < 0) {
        error("%s: %s\n", file, strerror(errno));
        (void) close(fd);
        return;
    }
    if (stb.st_size == 0) {
        (void) close(fd);
        return;
    }
    /*
     * Create a pipe to mailling program.
     */
    pf = popen(MAILCMD, "w");
    if (pf == NULL) {
        error("notify: \"%s\" failed\n", MAILCMD);
        (void) close(fd);
        return;
    }
    /*
     * Output the proper header information.
     */
    fprintf(pf, "From: rdist (Remote distribution program)\n");
    fprintf(pf, "To:");
    if (!any('@', to->n_name) && rhost != NULL)
        fprintf(pf, " %s@%s", to->n_name, rhost);
    else
        fprintf(pf, " %s", to->n_name);
    to = to->n_next;
    while (to != NULL) {
        if (!any('@', to->n_name) && rhost != NULL)
            fprintf(pf, ", %s@%s", to->n_name, rhost);
        else
            fprintf(pf, ", %s", to->n_name);
        to = to->n_next;
    }
    putc('\n', pf);
    if (rhost != NULL)
        fprintf(pf, "Subject: files updated by rdist from %s to %s\n",
            host, rhost);
    else
        fprintf(pf, "Subject: files updated after %s\n", ctime(&lmod));
    putc('\n', pf);

    while ((len = read(fd, buf, RDIST_BUFSIZ)) > 0)
        (void) fwrite(buf, 1, len, pf);
    (void) close(fd);
    (void) pclose(pf);
}

/*
 * Return true if name is in the list.
 */
int
inlist(list, file)
    struct namelist *list;
    char *file;
{
    register struct namelist *nl;

    for (nl = list; nl != NULL; nl = nl->n_next)
        if (strcmp(file, nl->n_name) == 0)
            return (1);
    return (0);
}

/*
 * Return TRUE if file is in the exception list.
 */
int
except(file)
    char *file;
{
    register struct subcmd *sc;
    register struct namelist *nl;

    if (debug)
        printf("except(%s)\n", file);

    for (sc = subcmds; sc != NULL; sc = sc->sc_next) {
        if (sc->sc_type != EXCEPT && sc->sc_type != PATTERN)
            continue;
        for (nl = sc->sc_args; nl != NULL; nl = nl->n_next) {
            if (sc->sc_type == EXCEPT) {
                if (strcmp(file, nl->n_name) == 0)
                    return (1);
                continue;
            }
            re_comp(nl->n_name);
            if (re_exec(file) > 0)
                return (1);
        }
    }
    return (0);
}

char *
colon(cp)
    register char *cp;
{

    while (*cp) {
        if (*cp == ':')
            return (cp);
        if (*cp == '/')
            return (0);
        cp++;
    }
    return (0);
}