diff options
Diffstat (limited to 'skeletons/GeneralizedTime.c')
| -rw-r--r-- | skeletons/GeneralizedTime.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/skeletons/GeneralizedTime.c b/skeletons/GeneralizedTime.c new file mode 100644 index 00000000..01d7a736 --- /dev/null +++ b/skeletons/GeneralizedTime.c @@ -0,0 +1,302 @@ +/*- + * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved. + * Redistribution and modifications are permitted subject to BSD license. + */ +#include <GeneralizedTime.h> +#include <time.h> +#include <errno.h> +#ifndef __NO_ASSERT_H__ +#include <assert.h> +#endif /* __NO_ASSERT_H__ */ + +#ifndef __NO_ASN_TABLE__ + +/* + * GeneralizedTime basic type description. + */ +static ber_tlv_tag_t asn1_DEF_GeneralizedTime_tags[] = { + (ASN_TAG_CLASS_UNIVERSAL | (24 << 2)) +}; +asn1_TYPE_descriptor_t asn1_DEF_GeneralizedTime = { + "GeneralizedTime", + GeneralizedTime_constraint, /* Check validity of time */ + OCTET_STRING_decode_ber, /* Implemented in terms of OCTET STRING */ + OCTET_STRING_encode_der, /* Implemented in terms of OCTET STRING */ + GeneralizedTime_print, + OCTET_STRING_free, + 0, /* Use generic outmost tag fetcher */ + asn1_DEF_GeneralizedTime_tags, + sizeof(asn1_DEF_GeneralizedTime_tags) + / sizeof(asn1_DEF_GeneralizedTime_tags[0]), + 1, /* Single UNIVERSAL tag may be implicitly overriden */ + -1, /* Both ways are fine */ +}; + +#endif /* __NO_ASN_TABLE__ */ + +/* + * Check that the time looks like the time. + */ +int +GeneralizedTime_constraint(asn1_TYPE_descriptor_t *td, const void *sptr, + asn_app_consume_bytes_f *app_errlog, void *app_key) { + const GeneralizedTime_t *st = sptr; + time_t tloc; + + errno = EPERM; /* Just an unlikely error code */ + tloc = asn_GT2time(st, 0); + if(tloc == -1 && errno != EPERM) { + _ASN_ERRLOG("%s: Invalid time format: %s", + td->name, strerror(errno)); + return -1; + } + + return 0; +} + +int +GeneralizedTime_print(asn1_TYPE_descriptor_t *td, const void *sptr, int ilevel, + asn_app_consume_bytes_f *cb, void *app_key) { + const GeneralizedTime_t *st = sptr; + + if(st && st->buf) { + char buf[32]; + struct tm tm; + int ret; + + errno = EPERM; + if(asn_GT2time(st, &tm) == -1 && errno != EPERM) + return cb("<bad-value>", 11, app_key); + + ret = snprintf(buf, sizeof(buf), + "%04d-%02d-%02d %02d:%02d%02d", + tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec); + assert(ret > 0 && ret < sizeof(buf)); + return cb(buf, ret, app_key); + } else { + return cb("<absent>", 8, app_key); + } +} + +/* + * Where to look for offset from GMT, Phase I. + * Several platforms are known. + */ +#if defined(__FreeBSD__) || (defined(__GNUC__) && defined(__APPLE_CC__)) +#undef HAVE_TM_ZONE +#define HAVE_TM_ZONE +#endif /* BSDs */ + +/* + * Where to look for offset from GMT, Phase II. + */ +#ifdef HAVE_TM_ZONE +#define GMTOFF (tm_s.tm_gmtoff) +#else /* HAVE_TM_ZONE */ +#define GMTOFF (-timezone) +#endif /* HAVE_TM_ZONE */ + +time_t +asn_GT2time(const GeneralizedTime_t *st, struct tm *_tm) { + struct tm tm_s; + uint8_t *buf; + uint8_t *end; + int tm_gmtoff_h = 0; + int tm_gmtoff_m = 0; + int tm_gmtoff = 0; /* h + m */ + int offset_specified = 0; + time_t tloc; + + if(!st || !st->buf) { + errno = EINVAL; + return -1; + } else { + buf = st->buf; + end = buf + st->size; + } + + if(st->size < 10) { + errno = EINVAL; + return -1; + } + + /* + * Decode first 10 bytes: "AAAAMMJJhh" + */ + memset(&tm_s, 0, sizeof(tm_s)); +#undef B2F +#undef B2T +#define B2F(var) do { \ + unsigned ch = *buf; \ + if(ch < 0x30 && ch > 0x39) { \ + errno = EINVAL; \ + return -1; \ + } else { \ + var = var * 10 + (ch - 0x30); \ + buf++; \ + } \ + } while(0) +#define B2T(var) B2F(tm_s.var) + + B2T(tm_year); /* 1: A */ + B2T(tm_year); /* 2: A */ + B2T(tm_year); /* 3: A */ + B2T(tm_year); /* 4: A */ + B2T(tm_mon); /* 5: M */ + B2T(tm_mon); /* 6: M */ + B2T(tm_mday); /* 7: J */ + B2T(tm_mday); /* 8: J */ + B2T(tm_hour); /* 9: h */ + B2T(tm_hour); /* 0: h */ + + if(buf == end) goto local_finish; + + /* + * Parse [mm[ss[(.|,)ffff]]] + * ^^ + */ + switch(*buf) { + case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: + case 0x35: case 0x36: case 0x37: case 0x38: case 0x39: + tm_s.tm_min = (*buf++) - 0x30; + if(buf == end) { errno = EINVAL; return -1; } + B2T(tm_min); + break; + case 0x2B: case 0x2D: /* +, - */ + goto offset; + case 0x5A: /* Z */ + goto utc_finish; + default: + errno = EINVAL; + return -1; + } + + if(buf == end) goto local_finish; + + /* + * Parse [mm[ss[(.|,)ffff]]] + * ^^ + */ + switch(*buf) { + case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: + case 0x35: case 0x36: case 0x37: case 0x38: case 0x39: + tm_s.tm_sec = (*buf++) - 0x30; + if(buf == end) { errno = EINVAL; return -1; } + B2T(tm_sec); + break; + case 0x2B: case 0x2D: /* +, - */ + goto offset; + case 0x5A: /* Z */ + goto utc_finish; + default: + errno = EINVAL; + return -1; + } + + if(buf == end) goto local_finish; + + /* + * Parse [mm[ss[(.|,)ffff]]] + * ^ ^ + */ + switch(*buf) { + case 0x2C: case 0x2E: /* (.|,) */ + /* Fractions of seconds are not supported + * by time_t or struct tm. Skip them */ + for(buf++; buf < end; buf++) { + switch(*buf) { + case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: + case 0x35: case 0x36: case 0x37: case 0x38: case 0x39: + continue; + default: + break; + } + break; + } + } + + if(buf == end) goto local_finish; + + switch(*buf) { + case 0x2B: case 0x2D: /* +, - */ + goto offset; + case 0x5A: /* Z */ + goto utc_finish; + default: + errno = EINVAL; + return -1; + } + + +offset: + + if(end - buf < 3) { + errno = EINVAL; + return -1; + } + buf++; + B2F(tm_gmtoff_h); + B2F(tm_gmtoff_h); + if(buf[-3] == 0x2D) /* Negative */ + tm_gmtoff = -1; + else + tm_gmtoff = 1; + + if((end - buf) == 2) { + B2F(tm_gmtoff_m); + B2F(tm_gmtoff_m); + } else if(end != buf) { + errno = EINVAL; + return -1; + } + + tm_gmtoff = tm_gmtoff * (3600 * tm_gmtoff_h + 60 * tm_gmtoff_m); + + /* Fall through */ +utc_finish: + + offset_specified = 1; + + /* Fall through */ +local_finish: + + /* + * Validation. + */ + if((tm_s.tm_mon > 12 || tm_s.tm_mon < 1) + || (tm_s.tm_mday > 31 || tm_s.tm_mday < 1) + || (tm_s.tm_hour > 23) + || (tm_s.tm_sec > 60) + ) { + errno = EINVAL; + return -1; + } + + /* Canonicalize */ + tm_s.tm_mon -= 1; /* 0 - 11 */ + tm_s.tm_year -= 1900; + tm_s.tm_isdst = -1; + + tloc = mktime(&tm_s); + if(tloc == -1) { + errno = EINVAL; + return -1; + } + + if(offset_specified) { + /* + * Offset from GMT is specified in the time expression. + */ + tloc += GMTOFF - tm_gmtoff; + if(_tm && (localtime_r(&tloc, &tm_s) == NULL)) { + /* Could not reconstruct the time */ + return -1; + } + } + + if(_tm) memcpy(_tm, &tm_s, sizeof(struct tm)); + + return tloc; +} + |