From: ian <ian>
Date: Tue, 9 Nov 1999 20:59:26 +0000 (+0000)
Subject: Found in davenant:/usr/local/src/misc
X-Git-Tag: rel-uservutils-0-1~21
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=userv-utils.git;a=commitdiff_plain;h=6a580c177a1b3b7f53daf402d97b491d462db8c3

Found in davenant:/usr/local/src/misc
---

diff --git a/www-cgi/Makefile b/www-cgi/Makefile
new file mode 100644
index 0000000..c2bfd7a
--- /dev/null
+++ b/www-cgi/Makefile
@@ -0,0 +1,22 @@
+CFLAGS=	-Wall -Wwrite-strings -Wmissing-prototypes -Wstrict-prototypes \
+	-Wpointer-arith -O2 -g -DREALLY_CHECK_FILE='"/etc/inittab"'
+LDFLAGS=
+
+TARGETS=really ucgi ucgitarget
+
+all:		$(TARGETS)
+
+ucgi:		ucgi.o ucgicommon.o
+
+ucgitarget:	ucgitarget.o ucgicommon.o
+
+really:		really.o myopt.o
+
+really-test:	really Makefile
+		rm -f really-test
+		cp really really-test
+		really chown root.staff really-test
+		really chmod 4770 really-test
+
+really-check:	really-test really.testcases
+		./really.testcases
diff --git a/www-cgi/ucgi.c b/www-cgi/ucgi.c
new file mode 100644
index 0000000..8edccc3
--- /dev/null
+++ b/www-cgi/ucgi.c
@@ -0,0 +1,77 @@
+/*
+ * Usage: as CGI script
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "ucgi.h"
+
+int main(int argc, const char **argv) {
+  char *defarg, *username;
+  const char *slash2, *pathi, *ev, *en, *av;
+  const char *const *ep;
+  const char **arguments;
+  size_t usernamelen, l;
+  pid_t child, rchild;
+  int nargs, status;
+
+  l= strlen(argv[0]);
+  if (l>6 && !strcmp(argv[0]+l-6,"-debug")) debugmode= 1;
+
+  if (debugmode) {
+    if (fputs("Content-Type: text/plain\n\n",stdout)==EOF || fflush(stdout))
+      syserror("write stdout");
+    if (dup2(1,2)<0) { perror("dup stdout to stderr"); exit(-1); }
+  }
+  
+  if (argc > MAX_ARGS) error("too many arguments");
+
+  pathi= getenv("PATH_INFO");
+  if (!pathi) error("PATH_INFO not found");
+  if (pathi[0] != '/' || pathi[1] != '~') error("PATH_INFO must start with /~");
+  slash2= strchr(pathi+2,'/'); if (!slash2) error("PATH_INFO must have more than one /");
+  usernamelen= slash2-(pathi+2);
+  if (usernamelen > MAX_USERNAME_LEN) error("PATH_INFO username too long");
+  username= xmalloc(usernamelen+1);
+  memcpy(username,pathi+2,usernamelen); username[usernamelen]= 0;
+  if (!isalpha(username[0])) error("username 1st character is not alphabetic");
+  xsetenv("PATH_INFO",slash2,1);
+  
+  arguments= xmalloc(sizeof(const char*)*(nenvok+argc+10));
+  nargs= 0;
+  
+  arguments[nargs++]= "userv";
+  if (debugmode) arguments[nargs++]= "-DDEBUG=1";
+  
+  for (ep= envok; (en= *ep); ep++) {
+    ev= getenv(en); if (!ev) continue;
+    l= strlen(ev); if (l > MAX_ENVVAR_VALUE) error("environment variable too long");
+    defarg= xmalloc(strlen(en)+l+6);
+    sprintf(defarg,"-DE_%s=%s",en,ev);
+    arguments[nargs++]= defarg;
+  }
+
+  arguments[nargs++]= username;
+  arguments[nargs++]= "www-cgi";
+  while ((av= (*++argv))) arguments[nargs++]= av;
+  arguments[nargs++]= 0;
+
+  if (debugmode) {
+    child= fork(); if (child==-1) syserror("fork");
+    if (child) {
+      rchild= waitpid(child,&status,0);
+      if (rchild==-1) syserror("waitpid");
+      printf("\nexit status %d %d\n",(status>>8)&0x0ff,status&0x0ff);
+      exit(0);
+    }
+  }
+      
+  execvp("userv",(char*const*)arguments);
+  syserror("exec userv");
+  return -1;
+}
diff --git a/www-cgi/ucgi.h b/www-cgi/ucgi.h
new file mode 100644
index 0000000..f361ce8
--- /dev/null
+++ b/www-cgi/ucgi.h
@@ -0,0 +1,22 @@
+/**/
+
+#ifndef UCGI_H
+#define UCGI_H
+
+#include <stdlib.h>
+
+#define MAX_ARGS 1024
+#define MAX_USERNAME_LEN 1024
+#define MAX_SCRIPTPATH_LEN 1024
+#define MAX_ENVVAR_VALUE (1024*1024)
+
+void syserror(const char *m);
+void error(const char *m);
+void *xmalloc(size_t sz);
+void xsetenv(const char *en, const char *ev, int overwrite);
+
+extern const char *const envok[];
+extern const int nenvok;
+extern int debugmode;
+
+#endif
diff --git a/www-cgi/ucgicommon.c b/www-cgi/ucgicommon.c
new file mode 100644
index 0000000..ba97474
--- /dev/null
+++ b/www-cgi/ucgicommon.c
@@ -0,0 +1,75 @@
+/**/
+
+#include <stdio.h>
+#include <string.h>
+
+#include "ucgi.h"
+
+const char *const envok[]= {
+  "CONTENT_LENGTH",
+  "CONTENT_TYPE",
+  "DOCUMENT_ROOT",
+  "GATEWAY_INTERFACE",
+  "HTTP_ACCEPT",
+  "HTTP_ACCEPT_ENCODING",
+  "HTTP_ACCEPT_LANGUAGE",
+  "HTTP_CACHE_CONTROL",
+  "HTTP_HOST",
+  "HTTP_NEGOTIATE",
+  "HTTP_PRAGMA",
+  "HTTP_USER_AGENT",
+  "PATH_INFO",
+  "PATH_TRANSLATED",
+  "QUERY_STRING",
+  "REMOTE_ADDR",
+  "REMOTE_HOST",
+  "REMOTE_USER",
+  "REMOTE_IDENT",
+  "REQUEST_METHOD",
+  "SCRIPT_FILENAME",
+  "SCRIPT_NAME",
+  "SCRIPT_URI",
+  "SCRIPT_URL",
+  "SERVER_ADMIN",
+  "SERVER_NAME",
+  "SERVER_PORT",
+  "SERVER_PROTOCOL",
+  "SERVER_SOFTWARE",
+  0
+};
+const int nenvok= sizeof(envok)/sizeof(envok[0]);
+
+int debugmode= 0;
+
+static void outerror(void) {
+  perror("stdout");
+  exit(debugmode ? 0 : -1);
+}
+
+void syserror(const char *m) {
+  if (printf("Content-Type: text/plain\n\n"
+	     "ucgi: system call error:\n"
+	     "%s: %s\n",
+	     m,strerror(errno))==EOF || fflush(stdout)) outerror();
+  exit(0);
+}
+
+void error(const char *m) {
+  if (printf("Content-Type: text/plain\n\n"
+	     "ucgi: error:\n"
+	     "%s\n",
+	     m)==EOF || fflush(stdout)) outerror();
+  exit(0);
+}
+
+void *xmalloc(size_t sz) {
+  void *r;
+
+  r= malloc(sz);
+  if (!r) syserror("malloc failed");
+  return r;
+}
+
+void xsetenv(const char *en, const char *ev, int overwrite) {
+  if (setenv(en,ev,overwrite)) syserror("setenv");
+}
diff --git a/www-cgi/ucgitarget.c b/www-cgi/ucgitarget.c
new file mode 100644
index 0000000..795d804
--- /dev/null
+++ b/www-cgi/ucgitarget.c
@@ -0,0 +1,108 @@
+/*
+ * Usage: as CGI script, but called by userv
+ * environment variables are USERV_U_E_...
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include "ucgi.h"
+
+static void *xrealloc(void *ptr, size_t sz) {
+  void *r;
+
+  r= realloc(ptr,sz);
+  if (!r) syserror("realloc failed");
+  return r;
+}
+
+int main(int argc, const char **argv) {
+  char *uservarn, *scriptpath, *newvar;
+  const char *nextslash, *lastslash, *pathi, *ev, *ev2, *en, *scriptdir, *av;
+  const char *const *ep;
+  const char **arguments;
+  size_t scriptdirlen, scriptpathlen, l, uservarnl;
+  struct stat stab;
+  int r, nargs;
+
+  ev= getenv("USERV_U_DEBUG");
+  if (ev && *ev) debugmode= 1;
+  
+  if (argc > MAX_ARGS) error("too many arguments");
+
+  if (!*++argv) error("no script directory argument");
+  ev= getenv("HOME"); if (!ev) error("no HOME env. var");
+  l= strlen(*argv)+strlen(ev);
+  newvar= xmalloc(l+2);
+  sprintf(newvar,"%s/%s",ev,*argv);
+  scriptdir= newvar;
+  scriptdirlen= strlen(scriptdir);
+
+  uservarn= 0;
+  uservarnl= 0;
+  for (ep= envok; (en= *ep); ep++) {
+    l= strlen(en)+11;
+    if (uservarnl<l) { uservarn= xrealloc(uservarn,l); uservarnl= l; }
+    sprintf(uservarn,"USERV_U_E_%s",en);
+    ev= getenv(uservarn); if (!ev) continue;
+    if (strlen(ev) > MAX_ENVVAR_VALUE) error("environment variable too long");
+    if (setenv(en,ev,1)) syserror("setenv");
+    unsetenv(uservarn);
+  }
+
+  scriptpath= 0;
+  pathi= getenv("PATH_INFO");
+  if (!pathi) error("PATH_INFO not found");
+  lastslash= pathi;
+  for (;;) {
+    if (*lastslash != '/') error("PATH_INFO expected slash not found");
+    if (lastslash[1]=='.' || lastslash[1]=='#' || !lastslash[1]) error("bad char begin");
+    nextslash= strchr(lastslash+1,'/');
+    if (!nextslash) nextslash= lastslash+1+strlen(lastslash+1);
+    if (!nextslash) error("insufficient elements in PATH_INFO");
+    if (nextslash==lastslash+1) error("empty component in PATH_INFO");
+    if (nextslash-pathi > MAX_SCRIPTPATH_LEN) error("PATH_INFO script path too long");
+    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");
+    r= stat(scriptpath,&stab); if (r) syserror("stat script");
+    if (S_ISREG(stab.st_mode)) break;
+    if (!S_ISDIR(stab.st_mode)) syserror("script not directory or file");
+    lastslash= 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");
+    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;
+
+  execvp(scriptpath,(char*const*)arguments);
+  syserror("exec script");
+  return -1;
+}