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-rw-r--r--ucgi/ucgitarget.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/ucgi/ucgitarget.c b/ucgi/ucgitarget.c
new file mode 100644
index 0000000..178fa4e
--- /dev/null
+++ b/ucgi/ucgitarget.c
@@ -0,0 +1,216 @@
+/*
+ * Usage: as CGI script, but called by userv
+ * environment variables are USERV_U_E_...
+ */
+/*
+ * Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+ * Copyright 1999,2003
+ * Chancellor Masters and Scholars of the University of Cambridge
+ * Copyright 2010 Tony Finch <fanf@dotat.at>
+ * Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with userv-utils; if not, see http://www.gnu.org/licenses/.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include "ucgi.h"
+
+static const char *const default_envok[]= {
+ "AUTH_TYPE",
+ "CONTENT_LENGTH",
+ "CONTENT_TYPE",
+ "DOCUMENT_ROOT",
+ "GATEWAY_INTERFACE",
+ "HTTP_ACCEPT",
+ "HTTP_ACCEPT_CHARSET",
+ "HTTP_ACCEPT_ENCODING",
+ "HTTP_ACCEPT_LANGUAGE",
+ "HTTP_CACHE_CONTROL",
+ "HTTP_CONNECTION",
+ "HTTP_CONTENT_ENCODING",
+ "HTTP_COOKIE",
+ "HTTP_DNT",
+ "HTTP_HOST",
+ "HTTP_KEEP_ALIVE",
+ "HTTP_NEGOTIATE",
+ "HTTP_PRAGMA",
+ "HTTP_REFERER",
+ "HTTP_USER_AGENT",
+ "HTTP_VIA",
+ "HTTP_X_FORWARDED_FOR",
+ "HTTPS",
+ "PATH_INFO",
+ "PATH_TRANSLATED",
+ "QUERY_STRING",
+ "REDIRECT_HANDLER",
+ "REDIRECT_SCRIPT_URI",
+ "REDIRECT_SCRIPT_URL",
+ "REDIRECT_STATUS",
+ "REDIRECT_URL",
+ "REMOTE_ADDR",
+ "REMOTE_HOST",
+ "REMOTE_USER",
+ "REMOTE_IDENT",
+ "REQUEST_METHOD",
+ "REQUEST_URI",
+ "SCRIPT_FILENAME",
+ "SCRIPT_NAME",
+ "SCRIPT_URI",
+ "SCRIPT_URL",
+ "SERVER_ADDR",
+ "SERVER_ADMIN",
+ "SERVER_NAME",
+ "SERVER_PORT",
+ "SERVER_PROTOCOL",
+ "SERVER_SIGNATURE",
+ "SERVER_SOFTWARE",
+ "SSL_CIPHER",
+ "SSL_CLIENT_S_DN",
+ "SSL_CLIENT_VERIFY",
+ "SSL_PROTOCOL",
+ 0
+};
+
+static void setenvar(const char *fulln,
+ const char *en, const char *ep, void *p) {
+ xsetenv(en, ep, 1);
+ unsetenv(fulln);
+}
+
+int main(int argc, char **argv) {
+ char *scriptpath, *newvar;
+ const char *nextslash, *lastslash, *pathi, *ev, *ev2, *scriptdir, *av;
+ const char *const *envok;
+ const char **arguments;
+ size_t scriptdirlen, scriptpathlen, l;
+ struct stat stab;
+ int i, r, nargs;
+ const char *filters= 0;
+
+ ev= getenv("USERV_U_DEBUG");
+ if (ev && *ev) debugmode= 1;
+
+ D( if (debugmode) printf(";;; UCGITARGET\n"); )
+ if (argc > MAX_ARGS) error("too many arguments", 500);
+
+ for (;;) {
+ i= getopt(argc, argv, "+e:"); if (i < 0) break;
+ switch (i) {
+ case 'e': filters= optarg; break;
+ default: error("bad command line", 500); break;
+ }
+ }
+ argc -= optind; argv += optind;
+
+ if (!*argv) error("no script directory argument", 500);
+ ev= getenv("HOME"); if (!ev) error("no HOME env. var", 500);
+ l= strlen(*argv)+strlen(ev);
+ newvar= xmalloc(l+2);
+ sprintf(newvar,"%s/%s",ev,*argv);
+ scriptdir= newvar;
+ scriptdirlen= strlen(scriptdir);
+
+ if (filters)
+ envok= load_filters(LOADF_MUST, filters, LF_END);
+ else {
+ envok= load_filters(0,
+ ".userv/ucgitarget.env-filter",
+ "/etc/userv/ucgitarget.env-filter",
+ LF_END);
+ }
+
+ filter_environment(0, "USERV_U_E_", envok, default_envok, setenvar, 0);
+
+ scriptpath= 0;
+ pathi= getenv("PATH_INFO");
+ if (!pathi) error("PATH_INFO not found", 500);
+ lastslash= pathi;
+ D( if (debugmode) {
+ printf(";; find script name...\n"
+ ";; PATH_INFO = `%s'\n",
+ pathi);
+ } )
+ for (;;) {
+ if (*lastslash != '/') error("PATH_INFO expected slash not found", 400);
+ if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1])
+ error("bad char begin", 400);
+ nextslash= strchr(lastslash+1,'/');
+ if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
+ if (!nextslash) error("insufficient elements in PATH_INFO", 400);
+ if (nextslash==lastslash+1) error("empty component in PATH_INFO", 400);
+ if (nextslash-pathi > MAX_SCRIPTPATH_LEN)
+ error("PATH_INFO script path too long", 400);
+ scriptpathlen= scriptdirlen+(nextslash-pathi);
+ scriptpath= xrealloc(scriptpath,scriptpathlen+1);
+ strcpy(scriptpath,scriptdir);
+ memcpy(scriptpath+scriptdirlen,pathi,nextslash-pathi);
+ scriptpath[scriptpathlen]= 0;
+ if (scriptpath[scriptpathlen-1]=='~') error("bad char end", 400);
+ D( if (debugmode) printf(";; try `%s'\n", scriptpath); )
+ r= stat(scriptpath,&stab); if (r) syserror("stat script");
+ if (S_ISREG(stab.st_mode)) break;
+ if (!S_ISDIR(stab.st_mode)) error("script not directory or file", 500);
+ lastslash= nextslash;
+ }
+ D( if (debugmode) printf(";; found script: tail = `%s'\n", nextslash); )
+ if (*nextslash) xsetenv("PATH_INFO",nextslash,1);
+ else unsetenv("PATH_INFO");
+
+ newvar= xmalloc(scriptpathlen+strlen(nextslash)+3);
+ sprintf(newvar,"%s%s",scriptpath,nextslash);
+ xsetenv("PATH_TRANSLATED",newvar,1);
+
+ xsetenv("SCRIPT_FILENAME",scriptpath,1);
+
+ ev= getenv("SCRIPT_NAME");
+ if (ev) {
+ ev2= getenv("USER"); if (!ev2) error("no USER variable", 500);
+ newvar= xmalloc(strlen(ev)+2+strlen(ev2)+scriptpathlen-scriptdirlen+2);
+ sprintf(newvar,"%s/~%s%s",ev,ev2,scriptpath+scriptdirlen);
+ xsetenv("SCRIPT_NAME",newvar,1);
+ }
+
+ arguments= xmalloc(sizeof(const char*)*(argc+5));
+ nargs= 0;
+
+ arguments[nargs++]= scriptpath;
+ while ((av= (*++argv))) arguments[nargs++]= av;
+ arguments[nargs++]= 0;
+
+ D( if (debugmode) {
+ int i;
+
+ printf(";; final environment...\n");
+ for (i = 0; environ[i]; i++)
+ printf(";; %s\n", environ[i]);
+
+ printf(";; final command line...\n");
+ for (i = 0; arguments[i]; i++)
+ printf(";; %s\n", arguments[i]);
+ fflush(stdout);
+ } )
+
+ execvp(scriptpath,(char*const*)arguments);
+ syserror("exec script");
+ return -1;
+}
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