Adding upstream version 4.96.upstream/4.96upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 984 insertions, 0 deletions

diff --git a/src/buildconfig.c b/src/buildconfig.c
new file mode 100644
index 0000000..f9a8feb
--- /dev/null
+++ b/src/buildconfig.c
@@ -0,0 +1,984 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+/*************************************************
+*       Build configuration header for Exim      *
+*************************************************/
+
+/* This auxiliary program builds the file config.h by the following
+process:
+
+First, it determines the size of off_t and time_t variables, and generates
+macro code to define OFF_T_FMT and TIME_T_FMT as suitable formats, if they are
+not already defined in the system-specific header file.
+
+Then it reads Makefile, looking for certain OS-specific definitions which it
+uses to define some specific macros. Finally, it reads the defaults file
+config.h.defaults.
+
+The defaults file contains normal C #define statements for various macros; if
+the name of a macro is found in the environment, the environment value replaces
+the default. If the default #define does not contain any value, then that macro
+is not copied to the created file unless there is some value in the
+environment.
+
+This program is compiled and run as part of the Make process and is not
+normally called independently. */
+
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <poll.h>
+#include <pwd.h>
+#include <grp.h>
+
+typedef struct {
+  const char *name;
+  int *flag;
+} have_item;
+
+typedef struct {
+  const char *name;
+  char *data;
+} save_item;
+
+static const char *db_opts[] = { "", "USE_DB", "USE_GDBM", "USE_TDB", "USE_NDBM" };
+
+static int have_ipv6 = 0;
+static int have_iconv = 0;
+
+static char errno_quota[256];
+static char ostype[256];
+static char cc[256];
+
+/* If any entry is an initial substring of another, the longer one must
+appear first. */
+
+static have_item have_list[] = {
+  { "HAVE_IPV6",      &have_ipv6 },
+  { "HAVE_ICONV",     &have_iconv },
+  { NULL, NULL}
+};
+
+static save_item save_list[] = {
+  { "ERRNO_QUOTA",    errno_quota },
+  { "OSTYPE",         ostype },
+  { "CC",             cc },
+  { NULL, NULL}
+};
+
+
+/* Subroutine to check a string for precisely one instance of "%s". If not,
+bomb out. */
+
+void
+check_percent_ess(char *value, char *name)
+{
+int OK = 0;
+char *p = strstr(value, "%s");
+if (p != NULL) OK = strstr(p+2, "%s") == NULL;
+if (!OK)
+  {
+  printf("\n*** \"%s\" (%s) must contain precisely one occurrence of\n"
+    "*** \"%%s\". Please review your build-time configuration.\n\n/", value,
+    name);
+  exit(1);
+  }
+}
+
+
+/* Main program */
+
+int
+main(int argc, char **argv)
+{
+off_t test_off_t = 0;
+time_t test_time_t = 0;
+ino_t test_ino_t;
+#if ! (__STDC_VERSION__ >= 199901L)
+size_t test_size_t = 0;
+ssize_t test_ssize_t = 0;
+unsigned long test_ulong_t = 0L;
+unsigned int test_uint_t = 0;
+#endif
+long test_long_t = 0;
+long long test_longlong_t = 0;
+int test_int_t = 0;
+FILE *base;
+FILE *new;
+int last_initial = 'A';
+int linecount = 0;
+int have_auth = 0;
+int in_local_makefile = 0;
+int use_which_db = 0;
+int use_which_db_in_local_makefile = 0;
+int support_crypteq = 0;
+char buffer[1024];
+
+if (argc != 1)
+  {
+  printf("*** Buildconfig: called with incorrect arguments\n");
+  exit(1);
+  }
+
+new = fopen("config.h", "wb");
+if (new == NULL)
+  {
+  printf("*** Buildconfig: failed to open config.h for output\n");
+  exit(1);
+  }
+
+printf("Building configuration file config.h\n");
+
+fprintf(new, "/*************************************************\n");
+fprintf(new, "*           Configuration header for Exim        *\n");
+fprintf(new, "*************************************************/\n\n");
+
+fprintf(new, "/* This file was automatically generated from Makefile and "
+  "config.h.defaults,\n");
+fprintf(new, "using values specified in the configuration file Local/Makefile.\n");
+fprintf(new, "Do not edit it. Instead, edit Local/Makefile and "
+  "rerun make. */\n\n");
+
+/* First, deal with the printing format for off_t variables. We assume that if
+the size of off_t is greater than 4, "%lld" will be available as a format for
+printing long long variables, and there will be support for the long long type.
+This assumption is known to be OK for the common operating systems. */
+
+fprintf(new, "#ifndef OFF_T_FMT\n");
+if (sizeof(test_off_t) > sizeof(test_long_t))
+  fprintf(new, "# define OFF_T_FMT  \"%%lld\"\n");
+else
+  fprintf(new, "# define OFF_T_FMT  \"%%ld\"\n");
+fprintf(new, "#endif\n\n");
+
+fprintf(new, "#ifndef LONGLONG_T\n");
+if (sizeof(test_longlong_t) > sizeof(test_long_t))
+  fprintf(new, "# define LONGLONG_T long long int\n");
+else
+  fprintf(new, "# define LONGLONG_T long int\n");
+fprintf(new, "#endif\n\n");
+
+/* Now do the same thing for time_t variables. If the length is greater than
+4, we want to assume long long support (even if off_t was less than 4). If the
+length is 4 or less, we can leave LONGLONG_T to whatever was defined above for
+off_t. */
+
+fprintf(new, "#ifndef TIME_T_FMT\n");
+if (sizeof(test_time_t) > sizeof(test_long_t))
+  {
+  fprintf(new, "# define TIME_T_FMT  \"%%lld\"\n");
+  fprintf(new, "# undef  LONGLONG_T\n");
+  fprintf(new, "# define LONGLONG_T long long int\n");
+  }
+else
+  fprintf(new, "# define TIME_T_FMT  \"%%ld\"\n");
+fprintf(new, "#endif\n\n");
+
+fprintf(new, "#ifndef INO_T_FMT\n");
+if (sizeof(test_ino_t) > sizeof(test_long_t))
+  fprintf(new, "# define INO_T_FMT  \"%%llu\"\n");
+else
+  fprintf(new, "# define INO_T_FMT  \"%%lu\"\n");
+fprintf(new, "#endif\n\n");
+
+fprintf(new, "#ifndef PID_T_FMT\n");
+fprintf(new, "# define PID_T_FMT  \"%%lu\"\n");
+fprintf(new, "#endif\n\n");
+
+/* And for sizeof() results, size_t, which should with C99 be just %zu, deal
+with C99 not being ubiquitous yet.  Unfortunately.  Assume ssize_t is same
+size as size_t on C99; if someone comes up with a version where it's not, fix
+it then. */
+
+#if __STDC_VERSION__ >= 199901L
+fprintf(new, "#define SIZE_T_FMT  \"%%zu\"\n");
+fprintf(new, "#define SSIZE_T_FMT  \"%%zd\"\n");
+#else
+if (sizeof(test_size_t) > sizeof (test_ulong_t))
+  fprintf(new, "#define SIZE_T_FMT  \"%%llu\"\n");
+else if (sizeof(test_size_t) > sizeof (test_uint_t))
+  fprintf(new, "#define SIZE_T_FMT  \"%%lu\"\n");
+else
+  fprintf(new, "#define SIZE_T_FMT  \"%%u\"\n");
+
+if (sizeof(test_ssize_t) > sizeof(test_long_t))
+  fprintf(new, "#define SSIZE_T_FMT  \"%%lld\"\n");
+else if (sizeof(test_ssize_t) > sizeof(test_int_t))
+  fprintf(new, "#define SSIZE_T_FMT  \"%%ld\"\n");
+else
+  fprintf(new, "#define SSIZE_T_FMT  \"%%d\"\n");
+#endif
+
+/* Now search the makefile for certain settings */
+
+if (!(base = fopen("Makefile", "rb")))
+  {
+  printf("*** Buildconfig: failed to open Makefile\n");
+  (void)fclose(new);
+  exit(1);
+  }
+
+errno_quota[0] = 0;    /* no over-riding value set */
+ostype[0] = 0;         /* just in case */
+cc[0] = 0;
+
+while (fgets(buffer, sizeof(buffer), base) != NULL)
+  {
+  int i;
+  have_item *h;
+  save_item *s;
+  char *p = buffer + (int)strlen(buffer);
+  linecount++;
+  while (p > buffer && isspace((unsigned char)p[-1])) p--;
+  *p = 0;
+  p = buffer;
+  while (isspace((unsigned char)*p)) p++;
+
+  /* Notice when we hit the user's makefile */
+
+  if (strcmp(p, "# From Local/Makefile") == 0)
+    {
+    in_local_makefile = 1;
+    continue;
+    }
+
+  /* Remember the last DB option setting. If we hit two in the user's
+  Makefile, complain. */
+
+  for (i = 1; i < sizeof(db_opts)/sizeof(char *); i++)
+    {
+    int len = (int)strlen(db_opts[i]);
+    if (strncmp(p, db_opts[i], len) == 0 && (p[len] == ' ' || p[len] == '='))
+      {
+      if (in_local_makefile)
+        {
+        if (use_which_db_in_local_makefile)
+          {
+          printf("*** Only one of USE_DB, USE_GDBM, or USE_TDB should be "
+            "defined in Local/Makefile\n");
+          exit(1);
+          }
+        use_which_db_in_local_makefile = 1;
+        }
+      use_which_db = i;
+      break;
+      }
+    }
+  if (i < sizeof(db_opts)/sizeof(char *)) continue;
+
+  /* Items where we just save a boolean */
+
+  for (h = have_list; h->name != NULL; h++)
+    {
+    int len = (int)strlen(h->name);
+    if (strncmp(p, h->name, len) == 0)
+      {
+      p += len;
+      while (isspace((unsigned char)*p)) p++;
+      if (*p++ != '=')
+        {
+        printf("*** Buildconfig: syntax error in Makefile line %d\n", linecount);
+        exit(1);
+        }
+      while (isspace((unsigned char)*p)) p++;
+      if (strcmp(p, "YES") == 0 || strcmp(p, "yes") == 0) *(h->flag) = 1;
+        else *(h->flag) = 0;   /* Must reset in case multiple instances */
+      break;
+      }
+    }
+
+  if (h->name != NULL) continue;
+
+  /* Items where we save the complete string */
+
+  for (s = save_list; s->name != NULL; s++)
+    {
+    int len = (int)strlen(s->name);
+    if (strncmp(p, s->name, len) == 0)
+      {
+      p += len;
+      while (isspace((unsigned char)*p)) p++;
+      if (*p++ != '=')
+        {
+        printf("*** Buildconfig: syntax error in Makefile line %d\n", linecount);
+        exit(1);
+        }
+      while (isspace((unsigned char)*p)) p++;
+      strcpy(s->data, p);
+      }
+    }
+  }
+
+fprintf(new, "#define HAVE_IPV6             %s\n",
+  have_ipv6? "TRUE" : "FALSE");
+
+fprintf(new, "#define HAVE_ICONV            %s\n",
+  have_iconv? "TRUE" : "FALSE");
+
+if (errno_quota[0] != 0)
+  fprintf(new, "\n#define ERRNO_QUOTA           %s\n", errno_quota);
+
+if (strcmp(cc, "gcc") == 0 &&
+    (strstr(ostype, "IRIX") != NULL || strstr(ostype, "AIX") != NULL))
+  {
+  fprintf(new, "\n/* This switch includes the code to fix the inet_ntoa() */");
+  fprintf(new, "\n/* bug when using gcc on an IRIX or AIX system. */");
+  fprintf(new, "\n#define USE_INET_NTOA_FIX");
+  }
+
+fprintf(new, "\n");
+(void)fclose(base);
+
+
+/* Now handle the macros listed in the defaults */
+
+base = fopen("../src/config.h.defaults", "rb");
+if (base == NULL)
+  {
+  printf("*** Buildconfig: failed to open ../src/config.h.defaults\n");
+  (void)fclose(new);
+  exit(1);
+  }
+
+while (fgets(buffer, sizeof(buffer), base) != NULL)
+  {
+  int i;
+  char name[256];
+  char *value;
+  char *p = buffer;
+  char *q = name;
+
+  while (*p == ' ' || *p == '\t') p++;
+
+  if (strncmp(p, "#ifdef ", 7) == 0
+   || strncmp(p, "#ifndef ", 8) == 0
+   || strncmp(p, "#if ", 4) == 0
+   || strncmp(p, "#endif", 6) == 0
+     )
+    {
+    fputs(buffer, new);
+    continue;
+    }
+
+  if (strncmp(p, "#define ", 8) != 0) continue;
+
+  p += 8;
+  while (*p == ' ' || *p == '\t') p++;
+
+  if (*p < last_initial) fprintf(new, "\n");
+  last_initial = *p;
+
+  while (*p && (isalnum((unsigned char)*p) || *p == '_')) *q++ = *p++;
+  *q = 0;
+
+  /* USE_DB, USE_GDBM, and USE_TDB are special cases. We want to have only
+  one of them set. The scan of the Makefile has saved which was the last one
+  encountered. */
+
+  for (i = 1; i < sizeof(db_opts)/sizeof(char *); i++)
+    if (strcmp(name, db_opts[i]) == 0)
+      {
+      if (use_which_db == i)
+        fprintf(new, "#define %s %.*syes\n", db_opts[i],
+          21 - (int)strlen(db_opts[i]), "                         ");
+      else
+        fprintf(new, "/* %s not set */\n", name);
+      break;
+      }
+  if (i < sizeof(db_opts)/sizeof(char *)) continue;
+
+  /* EXIM_USER is a special case. We look in the environment for EXIM_USER or
+  EXIM_UID (the latter for backward compatibility with Exim 3). If the value is
+  not numeric, we look up the user, and default the GID if found. Otherwise,
+  EXIM_GROUP or EXIM_GID must be in the environment. */
+
+  if (strcmp(name, "EXIM_UID") == 0)
+    {
+    uid_t uid = 0;
+    gid_t gid = 0;
+    int gid_set = 0;
+    int uid_not_set = 0;
+    char *username = NULL;
+    char *groupname = NULL;
+    char *s;
+    char *user = getenv("EXIM_USER");
+    char *group = getenv("EXIM_GROUP");
+
+    if (user == NULL) user = getenv("EXIM_UID");
+    if (group == NULL) group = getenv("EXIM_GID");
+
+    if (user == NULL)
+      {
+      printf("\n*** EXIM_USER has not been defined in any of the Makefiles in "
+        "the\n    \"Local\" directory. Please review your build-time "
+        "configuration.\n\n");
+      return 1;
+      }
+
+    while (isspace((unsigned char)(*user))) user++;
+    if (*user == 0)
+      {
+      printf("\n*** EXIM_USER is defined as an empty string in one of the "
+        "files\n    in the \"Local\" directory. Please review your build-time"
+        "\n    configuration.\n\n");
+      return 1;
+      }
+
+    for (s = user; *s != 0; s++)
+      {
+      if (iscntrl((unsigned char)(*s)))
+        {
+        printf("\n*** EXIM_USER contains the control character 0x%02X in one "
+          "of the files\n    in the \"Local\" directory. Please review your "
+          "build-time\n    configuration.\n\n", *s);
+        return 1;
+        }
+      }
+
+    /* Numeric uid given */
+
+    if (user[strspn(user, "0123456789")] == 0)
+      {
+      uid = (uid_t)atoi(user);
+      }
+
+    /* User name given. Normally, we look up the uid right away. However,
+    people building binary distributions sometimes want to retain the name till
+    runtime. This is supported if the name begins "ref:". */
+
+    else if (strncmp(user, "ref:", 4) == 0)
+      {
+      user += 4;
+      while (isspace(*user)) user++;
+      username = user;
+      gid_set = 1;
+      uid_not_set = 1;
+      }
+
+    else
+      {
+      struct passwd *pw = getpwnam(user);
+      if (pw == NULL)
+        {
+        printf("\n*** User \"%s\" (specified in one of the Makefiles) does not "
+          "exist.\n    Please review your build-time configuration.\n\n",
+          user);
+        return 1;
+        }
+
+      uid = pw->pw_uid;
+      gid = pw->pw_gid;
+      gid_set = 1;
+      }
+
+    /* Use explicit group if set. */
+
+    if (group != NULL)
+      {
+      while (isspace((unsigned char)(*group))) group++;
+      if (*group == 0)
+        {
+        printf("\n*** EXIM_GROUP is defined as an empty string in one of "
+          "the files in the\n    \"Local\" directory. ");
+        if (gid_set)
+          {
+          printf("If you want the Exim group to be taken from the\n    "
+            "password data for the Exim user, just remove the EXIM_GROUP "
+            "setting.\n    Otherwise, p");
+          }
+        else printf("EXIM_USER is defined numerically, so there is no"
+          "\n    default for EXIM_GROUP and you must set it explicitly.\n    P");
+        printf("lease review your build-time configuration.\n\n");
+        return 1;
+        }
+
+      for (s = group; *s != 0; s++)
+        {
+        if (iscntrl((unsigned char)(*s)))
+          {
+          printf("\n*** EXIM_GROUP contains the control character 0x%02X in one "
+            "of the files\n    in the \"Local\" directory. Please review your "
+            "build-time\n    configuration.\n\n", *s);
+          return 1;
+          }
+        }
+
+      /* Group name given. This may be by reference or to be looked up now,
+      as for user. */
+
+      if (strncmp(group, "ref:", 4) == 0)
+        {
+        group += 4;
+        while (isspace(*group)) group++;
+        groupname = group;
+        }
+
+      else if (username != NULL)
+        {
+        groupname = group;
+        }
+
+      else if (group[strspn(group, "0123456789")] == 0)
+        {
+        gid = (gid_t)atoi(group);
+        }
+
+      else
+        {
+        struct group *gr = getgrnam(group);
+        if (gr == NULL)
+          {
+          printf("\n*** Group \"%s\" (specified in one of the Makefiles) does "
+            "not exist.\n   Please review your build-time configuration.\n\n",
+            group);
+          return 1;
+          }
+        gid = gr->gr_gid;
+        }
+      }
+
+    /* Else trouble unless found in passwd file with user */
+
+    else if (!gid_set)
+      {
+      printf("\n*** No group set for Exim. Please review your build-time "
+        "configuration.\n\n");
+      return 1;
+      }
+
+    /* security sanity checks
+    if ref: is being used, we can never be sure, but we can take reasonable
+    steps to filter out the most obvious ones.  */
+
+    if ((!uid_not_set && uid == 0) ||
+        ((username != NULL) && (
+          (strcmp(username, "root") == 0) ||
+          (strcmp(username, "toor") == 0) )))
+      {
+      printf("\n*** Exim's internal user must not be root.\n\n");
+      return 1;
+      }
+
+    /* Output user and group names or uid/gid. When names are set, uid/gid
+    are set to zero but will be replaced at runtime. */
+
+    if (username != NULL)
+      fprintf(new, "#define EXIM_USERNAME         \"%s\"\n", username);
+    if (groupname != NULL)
+      fprintf(new, "#define EXIM_GROUPNAME        \"%s\"\n", groupname);
+
+    fprintf(new, "#define EXIM_UID              %d\n", (int)uid);
+    fprintf(new, "#define EXIM_GID              %d\n", (int)gid);
+    continue;
+    }
+
+  /* CONFIGURE_OWNER and CONFIGURE_GROUP are special cases. We look in the
+  environment for first. If the value is not numeric, we look up the user or
+  group. A lot of this code is similar to that for EXIM_USER, but it's easier
+  to keep it separate. */
+
+  if (strcmp(name, "CONFIGURE_OWNER") == 0 ||
+      strcmp(name, "CONFIGURE_GROUP") == 0)
+    {
+    int isgroup = name[10] == 'G';
+    uid_t uid = 0;
+    gid_t gid = 0;
+    const char *s;
+    const char *username = NULL;
+    const char *user = getenv(name);
+
+    if (user == NULL) user = "";
+    while (isspace((unsigned char)(*user))) user++;
+    if (*user == 0)
+      {
+      fprintf(new, "/* %s not set */\n", name);
+      continue;
+      }
+
+    for (s = user; *s != 0; s++)
+      {
+      if (iscntrl((unsigned char)(*s)))
+        {
+        printf("\n*** %s contains the control character 0x%02X in "
+          "one of the files\n    in the \"Local\" directory. Please review "
+          "your build-time\n    configuration.\n\n", name, *s);
+        return 1;
+        }
+      }
+
+    /* Numeric uid given */
+
+    if (user[strspn(user, "0123456789")] == 0)
+      {
+      if (isgroup)
+        gid = (gid_t)atoi(user);
+      else
+        uid = (uid_t)atoi(user);
+      }
+
+    /* Name given. Normally, we look up the uid or gid right away. However,
+    people building binary distributions sometimes want to retain the name till
+    runtime. This is supported if the name begins "ref:". */
+
+    else if (strncmp(user, "ref:", 4) == 0)
+      {
+      user += 4;
+      while (isspace(*user)) user++;
+      username = user;
+      }
+else if (isgroup)
+      {
+      struct group *gr = getgrnam(user);
+      if (gr == NULL)
+        {
+        printf("\n*** Group \"%s\" (specified in one of the Makefiles) does not "
+          "exist.\n    Please review your build-time configuration.\n\n",
+          user);
+        return 1;
+        }
+      gid = gr->gr_gid;
+      }
+
+    else
+      {
+      struct passwd *pw = getpwnam(user);
+      if (pw == NULL)
+        {
+        printf("\n*** User \"%s\" (specified in one of the Makefiles) does not "
+          "exist.\n    Please review your build-time configuration.\n\n",
+          user);
+        return 1;
+        }
+      uid = pw->pw_uid;
+      }
+
+    /* Output user and group names or uid/gid. When names are set, uid/gid
+    are set to zero but will be replaced at runtime. */
+
+    if (username != NULL)
+      {
+      if (isgroup)
+        fprintf(new, "#define CONFIGURE_GROUPNAME         \"%s\"\n", username);
+      else
+        fprintf(new, "#define CONFIGURE_OWNERNAME         \"%s\"\n", username);
+      }
+
+    if (isgroup)
+      fprintf(new, "#define CONFIGURE_GROUP              %d\n", (int)gid);
+    else
+      fprintf(new, "#define CONFIGURE_OWNER              %d\n", (int)uid);
+    continue;
+    }
+
+  /* FIXED_NEVER_USERS is another special case. Look up the uid values and
+  create suitable initialization data for a vector. */
+
+  if (strcmp(name, "FIXED_NEVER_USERS") == 0)
+    {
+    char *list = getenv("FIXED_NEVER_USERS");
+    if (list == NULL)
+      {
+      fprintf(new, "#define FIXED_NEVER_USERS     0\n");
+      }
+    else
+      {
+      int count = 1;
+      int i, j;
+      uid_t *vector;
+      char *p = list;
+      while (*p != 0) if (*p++ == ':') count++;
+
+      vector = malloc((count+1) * sizeof(uid_t));
+      vector[0] = (uid_t)count;
+
+      for (i = 1, j = 0; i <= count; list++, i++)
+        {
+        char name[64];
+
+        p = list;
+        while (*list != 0 && *list != ':') list++;
+        strncpy(name, p, list-p);
+        name[list-p] = 0;
+
+        if (name[0] == 0)
+          {
+          continue;
+          }
+        else if (name[strspn(name, "0123456789")] == 0)
+          {
+          vector[j++] = (uid_t)atoi(name);
+          }
+        else
+          {
+          struct passwd *pw = getpwnam(name);
+          if (pw == NULL)
+            {
+            printf("\n*** User \"%s\" (specified for FIXED_NEVER_USERS in one of the Makefiles) does not "
+              "exist.\n    Please review your build-time configuration.\n\n",
+              name);
+            return 1;
+            }
+          vector[j++] = pw->pw_uid;
+          }
+        }
+      fprintf(new, "#define FIXED_NEVER_USERS     %d", j);
+      for (i = 0; i < j; i++) fprintf(new, ", %d", (unsigned int)vector[i]);
+      fprintf(new, "\n");
+      free(vector);
+      }
+    continue;
+    }
+
+  /* WITH_CONTENT_SCAN is another special case: it must be set if it or
+  EXPERIMENTAL_DCC is set. */
+
+  if (strcmp(name, "WITH_CONTENT_SCAN") == 0)
+    {
+    char *wcs = getenv("WITH_CONTENT_SCAN");
+    char *dcc = getenv("EXPERIMENTAL_DCC");
+    fprintf(new, wcs || dcc
+      ? "#define WITH_CONTENT_SCAN     yes\n"
+      : "/* WITH_CONTENT_SCAN not set */\n");
+    continue;
+    }
+
+  /* DISABLE_DKIM is special; must be forced if DISABLE_TLS */
+  if (strcmp(name, "DISABLE_DKIM") == 0)
+    {
+    char *d_dkim = getenv("DISABLE_DKIM");
+    char *notls = getenv("DISABLE_TLS");
+
+    if (d_dkim)
+      fprintf(new, "#define DISABLE_DKIM          yes\n");
+    else if (notls)
+      fprintf(new, "#define DISABLE_DKIM          yes /* forced by lack of TLS */\n");
+    else
+      fprintf(new, "/* DISABLE_DKIM not set */\n");
+    continue;
+    }
+
+  /* Otherwise, check whether a value exists in the environment. Remember if
+  it is an AUTH setting or SUPPORT_CRYPTEQ. */
+
+  if ((value = getenv(name)) != NULL)
+    {
+    int len;
+    len = 21 - (int)strlen(name);
+
+    if (strncmp(name, "AUTH_", 5) == 0) have_auth = 1;
+    if (strncmp(name, "SUPPORT_CRYPTEQ", 15) == 0) support_crypteq = 1;
+
+    /* The text value of LDAP_LIB_TYPE refers to a macro that gets set. */
+
+    if (strcmp(name, "LDAP_LIB_TYPE") == 0)
+      {
+      if (strcmp(value, "NETSCAPE") == 0 ||
+          strcmp(value, "UMICHIGAN") == 0 ||
+          strcmp(value, "OPENLDAP1") == 0 ||
+          strcmp(value, "OPENLDAP2") == 0 ||
+          strcmp(value, "SOLARIS") == 0 ||
+          strcmp(value, "SOLARIS7") == 0)              /* Compatibility */
+        {
+        fprintf(new, "#define LDAP_LIB_%s\n", value);
+        }
+      else
+        {
+        printf("\n*** LDAP_LIB_TYPE=%s is not a recognized LDAP library type."
+          "\n*** Please review your build-time configuration.\n\n", value);
+        return 1;
+        }
+      }
+
+    else if (strcmp(name, "RADIUS_LIB_TYPE") == 0)
+      {
+      if (strcmp(value, "RADIUSCLIENT") == 0 ||
+          strcmp(value, "RADIUSCLIENTNEW") == 0 ||
+          strcmp(value, "RADLIB") == 0)
+        {
+        fprintf(new, "#define RADIUS_LIB_%s\n", value);
+        }
+      else
+        {
+        printf("\n*** RADIUS_LIB_TYPE=%s is not a recognized RADIUS library type."
+          "\n*** Please review your build-time configuration.\n\n", value);
+        return 1;
+        }
+      }
+
+    /* Other macros get set to the environment value. */
+
+    else
+      {
+      fprintf(new, "#define %s ", name);
+      while(len-- > 0) fputc(' ', new);
+
+      /* LOG_FILE_PATH is now messy because it can be a path containing %s or
+      it can be "syslog" or ":syslog" or "syslog:path" or even "path:syslog". */
+
+      if (strcmp(name, "LOG_FILE_PATH") == 0)
+        {
+        char *ss = value;
+        for(;;)
+          {
+          char *pp;
+          char *sss = strchr(ss, ':');
+          if (sss != NULL)
+            {
+            strncpy(buffer, ss, sss-ss);
+            buffer[sss-ss] = 0;  /* For empty case */
+            }
+          else
+	    {
+       	    strncpy(buffer, ss, sizeof(buffer));
+	    buffer[sizeof(buffer)-1] = 0;
+	    }
+          pp = buffer + (int)strlen(buffer);
+          while (pp > buffer && isspace((unsigned char)pp[-1])) pp--;
+          *pp = 0;
+          if (buffer[0] != 0 && strcmp(buffer, "syslog") != 0)
+            check_percent_ess(buffer, name);
+          if (sss == NULL) break;
+          ss = sss + 1;
+          while (isspace((unsigned char)*ss)) ss++;
+          }
+        fprintf(new, "\"%s\"\n", value);
+        }
+
+      /* Timezone values HEADERS_CHARSET, TCP_WRAPPERS_DAEMON_NAME and
+      WHITELIST_D_MACROS get quoted */
+
+      else if (strcmp(name, "TIMEZONE_DEFAULT") == 0||
+               strcmp(name, "TCP_WRAPPERS_DAEMON_NAME") == 0||
+               strcmp(name, "HEADERS_CHARSET") == 0||
+               strcmp(name, "WHITELIST_D_MACROS") == 0)
+        fprintf(new, "\"%s\"\n", value);
+
+      /* GnuTLS constants; first is for debugging, others are tuning */
+
+      /* less than 0 is not-active; 0-9 are normal, API suggests higher
+      taken without problems */
+      else if (strcmp(name, "EXIM_GNUTLS_LIBRARY_LOG_LEVEL") == 0)
+        {
+        long nv;
+        char *end;
+        nv = strtol(value, &end, 10);
+        if (end != value && *end == '\0' && nv >= -1 && nv <= 100)
+          {
+          fprintf(new, "%s\n", value);
+          }
+        else
+          {
+          printf("Value of %s should be -1..9\n", name);
+          return 1;
+          }
+        }
+
+      /* how many bits Exim, as a client, demands must be in D-H */
+      /* 1024 is a historical figure; some sites actually use lower, so we
+      permit the value to be lowered "dangerously" low, but not "insanely"
+      low.  Though actually, 1024 is becoming "dangerous". */
+      else if ((strcmp(name, "EXIM_CLIENT_DH_MIN_MIN_BITS") == 0) ||
+               (strcmp(name, "EXIM_CLIENT_DH_DEFAULT_MIN_BITS") == 0) ||
+               (strcmp(name, "EXIM_SERVER_DH_BITS_PRE2_12") == 0))
+        {
+        long nv;
+        char *end;
+        nv = strtol(value, &end, 10);
+        if (end != value && *end == '\0' && nv >= 512 && nv < 500000)
+          {
+          fprintf(new, "%s\n", value);
+          }
+        else
+          {
+          printf("Unreasonable value (%s) of \"%s\".\n", value, name);
+          return 1;
+          }
+        }
+
+      /* For others, quote any paths and don't quote anything else */
+
+      else
+        {
+        if (value[0] == '/') fprintf(new, "\"%s\"\n", value);
+          else fprintf(new, "%s\n", value);
+        }
+      }
+    }
+
+  /* Value not defined in the environment; use the default */
+
+  else
+    {
+    char *t = p;
+    while (*p == ' ' || *p == '\t') p++;
+    if (*p != '\n') fputs(buffer, new); else
+      {
+      *t = 0;
+      if (strcmp(name, "BIN_DIRECTORY")   == 0 ||
+          strcmp(name, "CONFIGURE_FILE")  == 0)
+        {
+        printf("\n*** %s has not been defined in any of the Makefiles in the\n"
+          "    \"Local\" directory. "
+          "Please review your build-time configuration.\n\n", name);
+        return 1;
+        }
+
+      if (strcmp(name, "TIMEZONE_DEFAULT") == 0)
+        {
+        char *tz = getenv("TZ");
+        fprintf(new, "#define TIMEZONE_DEFAULT      ");
+        if (tz == NULL) fprintf(new, "NULL\n"); else
+          fprintf(new, "\"%s\"\n", tz);
+        }
+
+      else fprintf(new, "/* %s not set */\n", name);
+      }
+    }
+  }
+
+(void)fclose(base);
+
+/* If any AUTH macros were defined, ensure that SUPPORT_CRYPTEQ is also
+defined. */
+
+if (have_auth)
+  if (!support_crypteq) fprintf(new, "/* Force SUPPORT_CRYPTEQ for AUTH */\n"
+    "#define SUPPORT_CRYPTEQ\n");
+
+/* Check poll() for timer functionality.
+Some OS' have released with it broken. */
+
+  {
+  struct timeval before, after;
+  size_t us;
+
+  gettimeofday(&before, NULL);
+  (void) poll(NULL, 0, 500);
+  gettimeofday(&after, NULL);
+
+  us = (after.tv_sec - before.tv_sec) * 1000000 +
+    (after.tv_usec - before.tv_usec);
+
+  if (us < 400000)
+    fprintf(new, "#define NO_POLL_H\n");
+  }
+
+/* End off */
+
+fprintf(new, "\n/* End of config.h */\n");
+(void)fclose(new);
+return 0;
+}
+
+/* End of buildconfig.c */