X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/35edf2ff67ad9fa5fc0e83bde865d807c297864f..a85c067ba6c6940512cf57ec213277a370d87e70:/src/src/buildconfig.c diff --git a/src/src/buildconfig.c b/src/src/buildconfig.c index f596ff827..710b53550 100644 --- a/src/src/buildconfig.c +++ b/src/src/buildconfig.c @@ -1,11 +1,11 @@ -/* $Cambridge: exim/src/src/buildconfig.c,v 1.2 2004/10/18 09:16:57 ph10 Exp $ */ - /************************************************* * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2004 */ +/* Copyright (c) The Exim Maintainers 2022 */ +/* Copyright (c) University of Cambridge 1995 - 2018 */ /* See the file NOTICE for conditions of use and distribution. */ +/* SPDX-License-Identifier: GPL-2.0-only */ /************************************************* @@ -15,8 +15,13 @@ /* This auxiliary program builds the file config.h by the following process: -First it reads Makefile, looking for certain OS-specific definitions which it -uses to define macros. Then it reads the defaults file config.h.defaults. +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 @@ -33,20 +38,22 @@ normally called independently. */ #include #include #include +#include +#include #include #include typedef struct { - char *name; + const char *name; int *flag; } have_item; typedef struct { - char *name; + const char *name; char *data; } save_item; -static char *db_opts[] = { "", "USE_DB", "USE_GDBM", "USE_TDB" }; +static const char *db_opts[] = { "", "USE_DB", "USE_GDBM", "USE_TDB", "USE_NDBM" }; static int have_ipv6 = 0; static int have_iconv = 0; @@ -96,6 +103,18 @@ if (!OK) 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'; @@ -132,13 +151,82 @@ 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, search the makefile for certain settings */ - -base = fopen("Makefile", "rb"); -if (base == NULL) +/* 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"); - fclose(new); + (void)fclose(new); exit(1); } @@ -242,15 +330,16 @@ fprintf(new, "#define HAVE_ICONV %s\n", if (errno_quota[0] != 0) fprintf(new, "\n#define ERRNO_QUOTA %s\n", errno_quota); -if (strcmp(cc, "gcc") == 0 && strstr(ostype, "IRIX") != NULL) +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 system. */"); + fprintf(new, "\n/* bug when using gcc on an IRIX or AIX system. */"); fprintf(new, "\n#define USE_INET_NTOA_FIX"); } fprintf(new, "\n"); -fclose(base); +(void)fclose(base); /* Now handle the macros listed in the defaults */ @@ -259,7 +348,7 @@ base = fopen("../src/config.h.defaults", "rb"); if (base == NULL) { printf("*** Buildconfig: failed to open ../src/config.h.defaults\n"); - fclose(new); + (void)fclose(new); exit(1); } @@ -273,6 +362,16 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) 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; @@ -289,7 +388,6 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) encountered. */ for (i = 1; i < sizeof(db_opts)/sizeof(char *); i++) - { if (strcmp(name, db_opts[i]) == 0) { if (use_which_db == i) @@ -299,7 +397,6 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) 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 @@ -312,6 +409,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) 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; @@ -366,6 +464,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) while (isspace(*user)) user++; username = user; gid_set = 1; + uid_not_set = 1; } else @@ -459,6 +558,19 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) 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. */ @@ -480,12 +592,12 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) if (strcmp(name, "CONFIGURE_OWNER") == 0 || strcmp(name, "CONFIGURE_GROUP") == 0) { - int isgroup = name[10] == 'G'; + int isgroup = name[10] == 'G'; uid_t uid = 0; - gid_t gid = 0; - char *s; - char *username = NULL; - char *user = getenv(name); + 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++; @@ -512,7 +624,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) { if (isgroup) gid = (gid_t)atoi(user); - else + else uid = (uid_t)atoi(user); } @@ -526,8 +638,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) while (isspace(*user)) user++; username = user; } - - else if (isgroup) +else if (isgroup) { struct group *gr = getgrnam(user); if (gr == NULL) @@ -560,13 +671,13 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) { if (isgroup) fprintf(new, "#define CONFIGURE_GROUPNAME \"%s\"\n", username); - else + else fprintf(new, "#define CONFIGURE_OWNERNAME \"%s\"\n", username); } - + if (isgroup) fprintf(new, "#define CONFIGURE_GROUP %d\n", (int)gid); - else + else fprintf(new, "#define CONFIGURE_OWNER %d\n", (int)uid); continue; } @@ -584,7 +695,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) else { int count = 1; - int i; + int i, j; uid_t *vector; char *p = list; while (*p != 0) if (*p++ == ':') count++; @@ -592,17 +703,22 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) vector = malloc((count+1) * sizeof(uid_t)); vector[0] = (uid_t)count; - for (i = 1; i <= count; list++, i++) + 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[strspn(name, "0123456789")] == 0) + if (name[0] == 0) { - vector[i] = (uid_t)atoi(name); + continue; + } + else if (name[strspn(name, "0123456789")] == 0) + { + vector[j++] = (uid_t)atoi(name); } else { @@ -614,17 +730,32 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) name); return 1; } - vector[i] = pw->pw_uid; + vector[j++] = pw->pw_uid; } } - fprintf(new, "#define FIXED_NEVER_USERS %d, ", count); - for (i = 1; i <= count - 1; i++) - fprintf(new, "%d, ", (unsigned int)vector[i]); - fprintf(new, "%d\n", (unsigned int)vector[i]); + 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; } + /* 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. */ @@ -660,6 +791,7 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) 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); @@ -694,7 +826,11 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) strncpy(buffer, ss, sss-ss); buffer[sss-ss] = 0; /* For empty case */ } - else strcpy(buffer, ss); + 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; @@ -707,12 +843,57 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) fprintf(new, "\"%s\"\n", value); } - /* Timezone values and HEADERS_CHARSET get quoted */ + /* Timezone values HEADERS_CHARSET, TCP_WRAPPERS_DAEMON_NAME and + WHITELIST_D_MACROS get quoted */ else if (strcmp(name, "TIMEZONE_DEFAULT") == 0|| - strcmp(name, "HEADERS_CHARSET") == 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 @@ -754,21 +935,37 @@ while (fgets(buffer, sizeof(buffer), base) != NULL) } } -fclose(base); +(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"); -fclose(new); +(void)fclose(new); return 0; }