fix multiple connections to same (down) host and loss of connection.

[unix-history] / usr / src / usr.bin / rdist / docmd.c

#ifndef lint
static  char *sccsid = "@(#)docmd.c     4.17 (Berkeley) 84/03/14";
#endif

#include "defs.h"
#include <setjmp.h>

FILE    *lfp;                   /* log file for recording files updated */
struct  subcmd *special;        /* list of special commands */
jmp_buf env;

int     cleanup();
int     lostconn();

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

       signal(SIGHUP, cleanup);
       signal(SIGINT, cleanup);
       signal(SIGQUIT, cleanup);
       signal(SIGTERM, cleanup);

       for (c = cmds; c != NULL; c = c->c_next) {
               switch (c->c_type) {
               case ARROW:
                       doarrow(c->c_files, c->c_name, c->c_cmds);
                       break;
               case DCOLON:
                       dodcolon(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.
*/
doarrow(files, rhost, cmds)
       struct namelist *files;
       char *rhost;
       struct subcmd *cmds;
{
       register struct namelist *f;
       register struct subcmd *sc;
       int n, ddir;

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

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

       ddir = files->n_next != NULL;   /* destination is a directory */

       if (nflag)
               printf("updating host %s\n", rhost);
       else {
               if (setjmp(env))
                       goto done;
               signal(SIGPIPE, lostconn);
               if (!makeconn(rhost))
                       return;
               if ((lfp = fopen(tmpfile, "w")) == NULL) {
                       fatal("cannot open %s\n", tmpfile);
                       exit(1);
               }
       }
       for (f = files; f != NULL; f = f->n_next) {
#ifdef notdef
               if (filec) {
                       register char **cpp;

                       for (cpp = filev; *cpp; cpp++)
                               if (!strcmp(f->b_name, *cpp))
                                       goto found;
                       if (!nflag)
                               (void) fclose(lfp);
                       continue;
               }
       found:
#endif
               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);
               }
               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);
}

/*
* Create a connection to the rdist server on the machine rhost.
*/
makeconn(rhost)
       char *rhost;
{
       register char *ruser, *cp;
       static char *cur_host = NULL;
       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 = NULL;
       }

       ruser = rindex(rhost, '.');
       if (ruser != NULL) {
               *ruser++ = '\0';
               if (!okname(ruser))
                       return(0);
       } else
               ruser = user;
       if (!qflag)
               printf("updating host %s\n", rhost);
       (void) sprintf(buf, "/usr/local/rdist -Server%s", qflag ? " -q" : "");

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

       fflush(stdout);
       rem = rcmd(&rhost, IPPORT_CMDSERVER, user, ruser, buf, 0);
       if (rem < 0)
               return(0);
       cp = buf;
       if (read(rem, cp, 1) != 1)
               lostconn();
       if (*cp == 'V') {
               do {
                       if (read(rem, cp, 1) != 1)
                               lostconn();
               } while (*cp++ != '\n' && cp < &buf[BUFSIZ]);
               *--cp = '\0';
               cp = buf;
               n = 0;
               while (*cp >= '0' && *cp <= '9')
                       n = (n * 10) + (*cp++ - '0');
               if (*cp == '\0' && n == VERSION) {
                       cur_host = rhost;
                       return(1);
               }
       }
       error("connection failed: version numbers don't match\n");
       return(0);
}

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

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

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

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.
*/
dodcolon(files, stamp, cmds)
       struct namelist *files;
       char *stamp;
       struct subcmd *cmds;
{
       register struct subcmd *sc;
       register struct namelist *f;
       register char **cpp;
       struct timeval tv[2];
       struct timezone tz;
       struct stat stb;

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

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

       if (stat(stamp, &stb) < 0) {
               error("%s: %s\n", stamp, sys_errlist[errno]);
               return;
       }
       if (debug)
               printf("%s: %d\n", stamp, stb.st_mtime);

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

       for (f = files; f != NULL; f = f->n_next) {
#ifdef notdef
               if (filec) {
                       for (cpp = filev; *cpp; cpp++)
                               if (!strcmp(b->b_name, *cpp))
                                       goto found;
                       continue;
               }
       found:
#endif
               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.
*/
cmptime(name)
       char *name;
{
       struct stat stb;

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

       if (inlist(except, name))
               return;

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

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

rcmptime(st)
       struct stat *st;
{
       register DIR *d;
       register struct direct *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, sys_errlist[errno]);
               return;
       }
       otp = tp;
       len = tp - target;
       while (dp = readdir(d)) {
               if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
                       continue;
               if (len + 1 + strlen(dp->d_name) >= 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.
*/
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, sys_errlist[errno]);
               return;
       }
       if (fstat(fd, &stb) < 0) {
               error("%s: %s\n", file, sys_errlist[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, BUFSIZ)) > 0)
               (void) fwrite(buf, 1, len, pf);
       (void) close(fd);
       (void) pclose(pf);
}

struct  namelist *except;               /* list of files to exclude */

/*
* Return true if name is in the list.
*/
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))
                       return(1);
       return(0);
}

/*
* Build the exception list from the EXCEPT commands.
*/
mkexceptlist(cmds)
       struct subcmd *cmds;
{
       register struct subcmd *sc;
       register struct namelist *el, *nl;

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

       except = el = NULL;
       for (sc = cmds; sc != NULL; sc = sc->sc_next) {
               if (sc->sc_type != EXCEPT)
                       continue;
               for (nl = sc->sc_args; nl != NULL; nl = nl->n_next) {
                       if (el == NULL)
                               except = el = makenl(nl->n_name);
                       else {
                               el->n_next = makenl(nl->n_name);
                               el = el->n_next;
                       }
               }
       }
       if (debug) {
               printf("except = ");
               prnames(except);
       }
       return(1);
}

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

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