usr.sbin/pkg_install/lib/url.c

   1 /*
   2  * FreeBSD install - a package for the installation and maintainance
   3  * of non-core utilities.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * Jordan K. Hubbard
  15  * 18 July 1993
  16  *
  17  * URL file access utilities.
  18  *
  19  */
  20
  21 #include <sys/cdefs.h>
  22 __FBSDID("$FreeBSD$");
  23
  24 #include "lib.h"
  25 #include <err.h>
  26 #include <fetch.h>
  27 #include <libgen.h>
  28 #include <sys/wait.h>
  29 #include <stdio.h>
  30
  31 /*
  32  * Try and fetch a file by URL, returning the directory name for where
  33  * it's unpacked, if successful.
  34  */
  35 char *
  36 fileGetURL(const char *base, const char *spec, int keep_package)
  37 {
  38     char *cp, *rp, *tmp;
  39     char fname[FILENAME_MAX];
  40     char pen[FILENAME_MAX];
  41     char pkg[FILENAME_MAX];
  42     char buf[8192];
  43     FILE *ftp;
  44     pid_t tpid;
  45     int pfd[2], pstat, r, w = 0;
  46     char *hint;
  47     int fd, pkgfd = 0;
  48
  49     rp = NULL;
  50     /* Special tip that sysinstall left for us */
  51     hint = getenv("PKG_ADD_BASE");
  52     if (!isURL(spec)) {
  53         if (!base && !hint)
  54             return NULL;
  55         /*
  56          * We've been given an existing URL (that's known-good) and now we need
  57          * to construct a composite one out of that and the basename we were
  58          * handed as a dependency.
  59          */
  60         if (base) {
  61             strcpy(fname, base);
  62             /*
  63              * Advance back two slashes to get to the root of the package
  64              * hierarchy
  65              */
  66             cp = strrchr(fname, '/');
  67             if (cp) {
  68                 *cp = '\0';     /* chop name */
  69                 cp = strrchr(fname, '/');
  70             }
  71             if (cp) {
  72                 *(cp + 1) = '\0';
  73                 strcat(cp, "All/");
  74                 strcat(cp, spec);
  75                 strcat(cp, ".tbz");
  76             }
  77             else
  78                 return NULL;
  79         }
  80         else {
  81             /*
  82              * Otherwise, we've been given an environment variable hinting
  83              * at the right location from sysinstall
  84              */
  85             strcpy(fname, hint);
  86             strcat(fname, spec);
  87             strcat(fname, ".tbz");
  88         }
  89     }
  90     else
  91         strcpy(fname, spec);
  92
  93     if (keep_package) {
  94         tmp = getenv("PKGDIR");
  95         strlcpy(pkg, tmp ? tmp : ".", sizeof(pkg));
  96         tmp = basename(fname);
  97         strlcat(pkg, "/", sizeof(pkg));
  98         strlcat(pkg, tmp, sizeof(pkg));
  99         if ((pkgfd = open(pkg, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1) {
 100             printf("Error: Unable to open %s\n", pkg);
 101             perror("open");
 102             return NULL;
 103         }
 104     }
 105
 106     fetchDebug = (Verbose > 0);
 107     if ((ftp = fetchGetURL(fname, Verbose ? "v" : NULL)) == NULL) {
 108         printf("Error: FTP Unable to get %s: %s\n",
 109                fname, fetchLastErrString);
 110         return NULL;
 111     }
 112
 113     if (isatty(0) || Verbose)
 114         printf("Fetching %s...", fname), fflush(stdout);
 115     pen[0] = '\0';
 116     if ((rp = make_playpen(pen, 0)) == NULL) {
 117         printf("Error: Unable to construct a new playpen for FTP!\n");
 118         fclose(ftp);
 119         return NULL;
 120     }
 121     if (pipe(pfd) == -1) {
 122         warn("pipe()");
 123         cleanup(0);
 124         exit(2);
 125     }
 126     if ((tpid = fork()) == -1) {
 127         warn("pipe()");
 128         cleanup(0);
 129         exit(2);
 130     }
 131     if (!tpid) {
 132         dup2(pfd[0], 0);
 133         for (fd = getdtablesize() - 1; fd >= 3; --fd)
 134             close(fd);
 135         execl("/usr/bin/tar", "tar",
 136             Verbose ? "-xpjvf" : "-xpjf",
 137             "-", (char *)0);
 138         _exit(2);
 139     }
 140     close(pfd[0]);
 141     for (;;) {
 142         if ((r = fread(buf, 1, sizeof buf, ftp)) < 1)
 143             break;
 144         if ((w = write(pfd[1], buf, r)) != r)
 145             break;
 146         if (keep_package) {
 147             if ((w = write(pkgfd, buf, r)) != r)
 148                 break;
 149         }
 150     }
 151     if (ferror(ftp))
 152         warn("warning: error reading from server");
 153     fclose(ftp);
 154     if (keep_package) {
 155         close(pkgfd);
 156     }
 157     close(pfd[1]);
 158     if (w == -1)
 159         warn("warning: error writing to tar");
 160     tpid = waitpid(tpid, &pstat, 0);
 161     if (Verbose)
 162         printf("tar command returns %d status\n", WEXITSTATUS(pstat));
 163     if (rp && (isatty(0) || Verbose))
 164         printf(" Done.\n");
 165     return rp;
 166 }