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Diffstat (limited to 'src/global/attr_override.c')
| -rw-r--r-- | src/global/attr_override.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/global/attr_override.c b/src/global/attr_override.c new file mode 100644 index 0000000..bff2954 --- /dev/null +++ b/src/global/attr_override.c @@ -0,0 +1,190 @@ +/*++ +/* NAME +/* attr_override 3 +/* SUMMARY +/* apply name=value settings from string +/* SYNOPSIS +/* #include <attr_override.h> +/* +/* void attr_override(bp, delimiters, parens, ... CA_ATTR_OVER_END); +/* char *bp; +/* const char *delimiters; +/* const char *parens; +/* DESCRIPTION +/* This routine updates the values of known in-memory variables +/* based on the name=value specifications from an input string. +/* The input format supports parentheses around name=value to +/* allow whitespace around "=" and within values. +/* +/* This may be used, for example, with client endpoint +/* specifications or with policy tables to allow selective +/* overrides of global main.cf parameter settings (timeouts, +/* fall-back policies, etc.). +/* +/* Arguments: +/* .IP bp +/* Pointer to input string. The input is modified. +/* .IP "delimiters, parens" +/* See mystrtok(3) for description. Typical values are +/* CHARS_COMMA_SP and CHARS_BRACE, respectively. +/* .PP +/* The parens argument is followed by a list of macros +/* with arguments. Each macro may appear only once. The list +/* must be terminated with CA_ATTR_OVER_END which has no argument. +/* The following describes the expected values. +/* .IP "CA_ATTR_OVER_STR_TABLE(const ATTR_OVER_STR *)" +/* The macro argument specifies a null-terminated table with +/* attribute names, assignment targets, and range limits which +/* should be the same as for the corresponding main.cf parameters. +/* .IP "CA_ATTR_OVER_TIME_TABLE(const ATTR_OVER_TIME *)" +/* The macro argument specifies a null-terminated table with +/* attribute names, their default time units (leading digits +/* are skipped), assignment targets, and range limits which +/* should be the same as for the corresponding main.cf parameters. +/* .IP "CA_ATTR_OVER_INT_TABLE(const ATTR_OVER_INT *)" +/* The macro argument specifies a null-terminated table with +/* attribute names, assignment targets, and range limits which +/* should be the same as for the corresponding main.cf parameters. +/* SEE ALSO +/* mystrtok(3), safe tokenizer +/* extpar(3), extract text from parentheses +/* split_nameval(3), name-value splitter +/* DIAGNOSTICS +/* Panic: interface violations. +/* +/* Fatal errors: memory allocation problem, syntax error, +/* out-of-range error. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + + /* + * System library. + */ +#include <sys_defs.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> /* strtol() */ + + /* + * Utility library. + */ +#include <msg.h> +#include <stringops.h> + + /* + * Global library. + */ +#include <mail_conf.h> +#include <conv_time.h> +#include <attr_override.h> + +/* attr_override - apply settings from list of attribute=value pairs */ + +void attr_override(char *cp, const char *sep, const char *parens,...) +{ + static const char myname[] = "attr_override"; + va_list ap; + int idx; + char *nameval; + const ATTR_OVER_INT *int_table = 0; + const ATTR_OVER_STR *str_table = 0; + const ATTR_OVER_TIME *time_table = 0; + + /* + * Get the lookup tables and assignment targets. + */ + va_start(ap, parens); + while ((idx = va_arg(ap, int)) != ATTR_OVER_END) { + switch (idx) { + case ATTR_OVER_INT_TABLE: + if (int_table) + msg_panic("%s: multiple ATTR_OVER_INT_TABLE", myname); + int_table = va_arg(ap, const ATTR_OVER_INT *); + break; + case ATTR_OVER_STR_TABLE: + if (str_table) + msg_panic("%s: multiple ATTR_OVER_STR_TABLE", myname); + str_table = va_arg(ap, const ATTR_OVER_STR *); + break; + case ATTR_OVER_TIME_TABLE: + if (time_table) + msg_panic("%s: multiple ATTR_OVER_TIME_TABLE", myname); + time_table = va_arg(ap, const ATTR_OVER_TIME *); + break; + default: + msg_panic("%s: unknown argument type: %d", myname, idx); + } + } + va_end(ap); + + /* + * Process each attribute=value override in the input string. + */ + while ((nameval = mystrtokq(&cp, sep, parens)) != 0) { + int found = 0; + char *key; + char *value; + const char *err; + const ATTR_OVER_INT *ip; + const ATTR_OVER_STR *sp; + const ATTR_OVER_TIME *tp; + int int_val; + int def_unit; + char *end; + long longval; + + /* + * Split into name and value. + */ + /* { name = value } */ + if (*nameval == parens[0] + && (err = extpar(&nameval, parens, EXTPAR_FLAG_NONE)) != 0) + msg_fatal("%s in \"%s\"", err, nameval); + if ((err = split_nameval(nameval, &key, &value)) != 0) + msg_fatal("malformed option: %s: \"...%s...\"", err, nameval); + + /* + * Look up the name and apply the value. + */ + for (sp = str_table; sp != 0 && found == 0 && sp->name != 0; sp++) { + if (strcmp(sp->name, key) != 0) + continue; + check_mail_conf_str(sp->name, value, sp->min, sp->max); + sp->target[0] = value; + found = 1; + } + for (ip = int_table; ip != 0 && found == 0 && ip->name != 0; ip++) { + if (strcmp(ip->name, key) != 0) + continue; + /* XXX Duplicated from mail_conf_int(3). */ + errno = 0; + int_val = longval = strtol(value, &end, 10); + if (*value == 0 || *end != 0 || errno == ERANGE + || longval != int_val) + msg_fatal("bad numerical configuration: %s = %s", key, value); + check_mail_conf_int(key, int_val, ip->min, ip->max); + ip->target[0] = int_val; + found = 1; + } + for (tp = time_table; tp != 0 && found == 0 && tp->name != 0; tp++) { + if (strcmp(tp->name, key) != 0) + continue; + def_unit = tp->defval[strspn(tp->defval, "0123456789")]; + if (conv_time(value, &int_val, def_unit) == 0) + msg_fatal("%s: bad time value or unit: %s", key, value); + check_mail_conf_time(key, int_val, tp->min, tp->max); + tp->target[0] = int_val; + found = 1; + } + if (found == 0) + msg_fatal("unknown option: \"%s = %s\"", key, value); + } +} |