6a580c17 |
1 | /* |
2 | * Usage: as CGI script, but called by userv |
3 | * environment variables are USERV_U_E_... |
4 | */ |
39c4ee86 |
5 | /* |
6 | * Copyright (C) 1998-1999 Ian Jackson |
7 | * |
8 | * This is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 2 of the License, or |
11 | * (at your option) any later version. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, but |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with userv-utils; if not, write to the Free Software |
20 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
21 | * |
22 | * $Id: ucgitarget.c,v 1.2 1999/11/09 23:04:32 ian Exp $ |
23 | */ |
6a580c17 |
24 | |
25 | #include <stdio.h> |
26 | #include <string.h> |
27 | #include <ctype.h> |
28 | #include <unistd.h> |
29 | #include <sys/types.h> |
30 | #include <sys/wait.h> |
31 | #include <sys/stat.h> |
32 | |
33 | #include "ucgi.h" |
34 | |
35 | static void *xrealloc(void *ptr, size_t sz) { |
36 | void *r; |
37 | |
38 | r= realloc(ptr,sz); |
39 | if (!r) syserror("realloc failed"); |
40 | return r; |
41 | } |
42 | |
43 | int main(int argc, const char **argv) { |
44 | char *uservarn, *scriptpath, *newvar; |
45 | const char *nextslash, *lastslash, *pathi, *ev, *ev2, *en, *scriptdir, *av; |
46 | const char *const *ep; |
47 | const char **arguments; |
48 | size_t scriptdirlen, scriptpathlen, l, uservarnl; |
49 | struct stat stab; |
50 | int r, nargs; |
51 | |
52 | ev= getenv("USERV_U_DEBUG"); |
53 | if (ev && *ev) debugmode= 1; |
54 | |
55 | if (argc > MAX_ARGS) error("too many arguments"); |
56 | |
57 | if (!*++argv) error("no script directory argument"); |
58 | ev= getenv("HOME"); if (!ev) error("no HOME env. var"); |
59 | l= strlen(*argv)+strlen(ev); |
60 | newvar= xmalloc(l+2); |
61 | sprintf(newvar,"%s/%s",ev,*argv); |
62 | scriptdir= newvar; |
63 | scriptdirlen= strlen(scriptdir); |
64 | |
65 | uservarn= 0; |
66 | uservarnl= 0; |
67 | for (ep= envok; (en= *ep); ep++) { |
68 | l= strlen(en)+11; |
69 | if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; } |
70 | sprintf(uservarn,"USERV_U_E_%s",en); |
71 | ev= getenv(uservarn); if (!ev) continue; |
72 | if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long"); |
73 | if (setenv(en,ev,1)) syserror("setenv"); |
74 | unsetenv(uservarn); |
75 | } |
76 | |
77 | scriptpath= 0; |
78 | pathi= getenv("PATH_INFO"); |
79 | if (!pathi) error("PATH_INFO not found"); |
80 | lastslash= pathi; |
81 | for (;;) { |
82 | if (*lastslash != '/') error("PATH_INFO expected slash not found"); |
83 | if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin"); |
84 | nextslash= strchr(lastslash+1,'/'); |
85 | if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1); |
86 | if (!nextslash) error("insufficient elements in PATH_INFO"); |
87 | if (nextslash==lastslash+1) error("empty component in PATH_INFO"); |
88 | if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long"); |
89 | scriptpathlen= scriptdirlen+(nextslash-pathi); |
90 | scriptpath= xrealloc(scriptpath,scriptpathlen+1); |
91 | strcpy(scriptpath,scriptdir); |
92 | memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi); |
93 | scriptpath[scriptpathlen]= 0; |
94 | if (scriptpath[scriptpathlen-1]=='~') error("bad char end"); |
95 | r= stat(scriptpath,&stab); if (r) syserror("stat script"); |
96 | if (S_ISREG(stab.st_mode)) break; |
97 | if (!S_ISDIR(stab.st_mode)) syserror("script not directory or file"); |
98 | lastslash= nextslash; |
99 | } |
100 | if (*nextslash) xsetenv("PATH_INFO",nextslash,1); |
101 | else unsetenv("PATH_INFO"); |
102 | |
103 | newvar= xmalloc(scriptpathlen+strlen(nextslash)+3); |
104 | sprintf(newvar,"%s%s",scriptpath,nextslash); |
105 | xsetenv("PATH_TRANSLATED",newvar,1); |
106 | |
107 | xsetenv("SCRIPT_FILENAME",scriptpath,1); |
108 | |
109 | ev= getenv("SCRIPT_NAME"); |
110 | if (ev) { |
111 | ev2= getenv("USER"); if (!ev2) error("no USER variable"); |
112 | newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2); |
113 | sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen); |
114 | xsetenv("SCRIPT_NAME",newvar,1); |
115 | } |
116 | |
117 | arguments= xmalloc(sizeof(const char*)*(argc+5)); |
118 | nargs= 0; |
119 | |
120 | arguments[nargs++]= scriptpath; |
121 | while ((av= (*++argv))) arguments[nargs++]= av; |
122 | arguments[nargs++]= 0; |
123 | |
124 | execvp(scriptpath,(char*const*)arguments); |
125 | syserror("exec script"); |
126 | return -1; |
127 | } |