mirror of
https://github.com/leahneukirchen/mblaze
synced 2024-11-15 18:14:02 +00:00
642 lines
11 KiB
C
642 lines
11 KiB
C
#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "blaze822.h"
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#include "blaze822_priv.h"
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#define bufsiz 4096
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static long
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parse_posint(char **s, size_t minn, size_t maxn)
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{
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long n;
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char *end;
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errno = 0;
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n = strtol(*s, &end, 10);
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if (errno)
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return -1;
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if (n < (long)minn || n > (long)maxn) {
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errno = ERANGE;
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return -1;
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}
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*s = end;
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return n;
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}
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time_t
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blaze822_date(char *s) {
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struct tm tm;
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int c;
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#define i4(m) (((uint32_t) m[0]<<24 | m[1]<<16 | m[2]<<8 | m[3]) == \
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((uint32_t) s[0]<<24 | s[1]<<16 | s[2]<<8 | s[3] | 0x20202020) \
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&& (s += 4))
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#define i3(m) (((uint32_t) m[0]<<24 | m[1]<<16 | m[2]<<8) == \
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((uint32_t) s[0]<<24 | s[1]<<16 | s[2]<<8 | 0x20202000) \
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&& (s += 3))
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while (iswsp(*s))
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s++;
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if (i4("mon,") || i4("tue,") || i4("wed,") || i4("thu,") ||
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i4("fri,") || i4("sat,") || i4("sun,"))
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while (iswsp(*s))
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s++;
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if ((c = parse_posint(&s, 1, 31)) < 0) goto fail;
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tm.tm_mday = c;
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while (iswsp(*s))
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s++;
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if (i3("jan")) tm.tm_mon = 0;
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else if (i3("feb")) tm.tm_mon = 1;
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else if (i3("mar")) tm.tm_mon = 2;
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else if (i3("apr")) tm.tm_mon = 3;
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else if (i3("may")) tm.tm_mon = 4;
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else if (i3("jun")) tm.tm_mon = 5;
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else if (i3("jul")) tm.tm_mon = 6;
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else if (i3("aug")) tm.tm_mon = 7;
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else if (i3("sep")) tm.tm_mon = 8;
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else if (i3("oct")) tm.tm_mon = 9;
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else if (i3("nov")) tm.tm_mon = 10;
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else if (i3("dec")) tm.tm_mon = 11;
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else goto fail;
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#undef i3
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#undef i4
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while (iswsp(*s))
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s++;
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if ((c = parse_posint(&s, 1000, 9999)) > 0) {
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tm.tm_year = c - 1900;
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} else if ((c = parse_posint(&s, 0, 49)) > 0) {
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tm.tm_year = c + 100;
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} else if ((c = parse_posint(&s, 50, 99)) > 0) {
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tm.tm_year = c;
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} else goto fail;
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while (iswsp(*s))
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s++;
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if ((c = parse_posint(&s, 0, 24)) < 0) goto fail;
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tm.tm_hour = c;
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if (*s++ != ':') goto fail;
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if ((c = parse_posint(&s, 0, 59)) < 0) goto fail;
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tm.tm_min = c;
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if (*s++ == ':') {
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if ((c = parse_posint(&s, 0, 61)) < 0) goto fail;
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tm.tm_sec = c;
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} else {
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tm.tm_sec = 0;
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}
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while (iswsp(*s))
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s++;
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if (*s == '+' || *s == '-') {
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int neg = (*s == '-');
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s++;
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if ((c = parse_posint(&s, 0, 10000)) < 0) goto fail;
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if (neg) {
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tm.tm_hour += c / 100;
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tm.tm_min += c % 100;
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} else {
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tm.tm_hour -= c / 100;
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tm.tm_min -= c % 100;
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}
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}
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tm.tm_isdst = -1;
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time_t r = tm_to_secs(&tm);
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return r;
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fail:
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return -1;
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}
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char *
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blaze822_addr(char *s, char **dispo, char **addro)
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{
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static char disp[1024];
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static char addr[1024];
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char *c, *e;
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while (iswsp(*s))
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s++;
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if (!*s) {
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if (dispo) *dispo = 0;
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if (addro) *addro = 0;
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return 0;
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}
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c = disp;
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e = disp + sizeof disp - 1;
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*disp = 0;
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*addr = 0;
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while (*s && c < e) {
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startover:
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if (*s == '<') {
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char *c = addr;
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char *e = addr + sizeof addr;
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s++;
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while (*s && c < e && *s != '>') {
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if (*s == '<') {
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goto startover;
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} else if (*s == '"') {
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// local part may be quoted, allow all
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s++;
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while (*s && c < e && *s != '"')
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*c++ = *s++;
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if (*s == '"')
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s++;
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} else {
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*c++ = *s++;
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}
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}
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if (*s == '>')
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s++;
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while (iswsp(*s))
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s++;
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*c = 0;
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} else if (*s == '"') {
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s++;
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while (*s && c < e && *s != '"') {
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if (*s == '\\' && *(s+1))
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s++;
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*c++ = *s++;
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}
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if (*s == '"')
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s++;
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} else if (*s == '(') { // XXX recurse to conform?
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s++;
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if (!*addr) { // assume: user@host (name)
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*c-- = 0;
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while (c > disp && iswsp(*c))
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*c-- = 0;
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c++;
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memcpy(addr, disp, (c - disp) + 1);
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c = disp;
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*c = 0;
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}
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while (*s && c < e && *s != ')')
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*c++ = *s++;
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if (*s == ')')
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s++;
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} else if (*s == '\\') {
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s++;
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if (*s)
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*c++ = *s++;
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} else if (*s == ':') {
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s++;
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while (iswsp(*s))
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s++;
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c = disp; // forget already read group name
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} else if (*s == ',' || *s == ';') {
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s++;
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break;
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} else {
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*c++ = *s++;
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}
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}
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*c-- = 0;
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// strip trailing ws
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while (c > disp && iswsp(*c))
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*c-- = 0;
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if (*disp && !*addr && strchr(disp, '@')) {
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// just mail address was given
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c++;
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memcpy(addr, disp, (c - disp) + 1);
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*disp = 0;
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}
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if (dispo) *dispo = *disp ? disp : 0;
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if (addro) *addro = *addr ? addr : 0;
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return s;
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}
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static void
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compress_hdr(char *s, char *end)
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{
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char *t, *h;
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if ((t = h = strchr(s, '\n'))) {
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while (h < end && *h) {
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if (*h == '\n') {
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*t++ = ' ';
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while (*h && isfws(*h))
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h++;
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}
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*t++ = *h++;
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}
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// remove trailing whitespace
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while (s < t && isfws(t[-1]))
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*--t = 0;
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// zero fill gap
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while (t < h)
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*t++ = 0;
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}
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}
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static void
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unfold_hdr(char *buf, char *end)
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{
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char *s, *l;
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*end = 0;
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// sanitize all nul in message headers, srsly
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if (memchr(buf, 0, end-buf))
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for (s = buf; s < end; s++)
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if (*s == 0)
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*s = ' ';
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// normalize crlf
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if (memchr(buf, '\r', end-buf))
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for (s = buf; s < end; s++)
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if (*s == '\r') {
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if (*(s+1) == '\n')
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*s = '\n';
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else
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*s = ' ';
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}
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l = buf;
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s = buf;
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while (s < end && *s != ':' && *s != '\n') {
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*s = lc(*s);
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s++;
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}
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while (s < end) {
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s = memchr(s+1, '\n', end-s);
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if (!s)
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break;
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while (s < end && *s == '\n')
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s++;
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if (!iswsp(*s)) {
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*(s-1) = 0;
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compress_hdr(l, s-1);
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l = s;
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while (s < end && *s != ':' && *s != '\n') {
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*s = lc(*s);
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s++;
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}
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}
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}
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compress_hdr(l, end);
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}
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struct message *
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blaze822(char *file)
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{
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int fd;
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ssize_t rd;
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char *buf;
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ssize_t bufalloc;
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ssize_t used;
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char *end;
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struct message *mesg = malloc(sizeof (struct message));
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if (!mesg)
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return 0;
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fd = open(file, O_RDONLY);
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if (fd < 0) {
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free(mesg);
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return 0;
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}
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buf = 0;
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bufalloc = 0;
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used = 0;
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while (1) {
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int overlap = used > 3 ? 3 : 0;
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bufalloc += bufsiz;
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buf = realloc(buf, bufalloc);
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if (!buf) {
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free(mesg);
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close(fd);
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return 0;
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}
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rd = read(fd, buf+used, bufalloc-used);
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if (rd == 0) {
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end = buf+used;
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break;
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}
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if (rd < 0) {
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free(mesg);
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free(buf);
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close(fd);
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return 0;
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}
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if ((end = mymemmem(buf-overlap+used, rd+overlap, "\n\n", 2))) {
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end++;
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break;
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}
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if ((end = mymemmem(buf-overlap+used, rd+overlap, "\r\n\r\n", 4))) {
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end++;
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end++;
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break;
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}
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used += rd;
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}
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close(fd);
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*end = 0; // dereferencing *end is safe
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unfold_hdr(buf, end);
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mesg->msg = buf;
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mesg->end = end;
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mesg->body = mesg->bodyend = mesg->bodychunk = mesg->orig_header = 0;
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return mesg;
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}
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struct message *
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blaze822_mem(char *src, size_t len)
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{
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char *buf;
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char *end;
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struct message *mesg = malloc(sizeof (struct message));
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if (!mesg)
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return 0;
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if ((end = mymemmem(src, len, "\n\n", 2))) {
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mesg->body = end+2;
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} else if ((end = mymemmem(src, len, "\r\n\r\n", 4))) {
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mesg->body = end+4;
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} else {
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end = src + len;
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mesg->body = end;
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mesg->bodyend = end;
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}
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if (mesg->body)
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mesg->bodyend = src + len;
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size_t hlen = end - src;
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buf = malloc(hlen+1);
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if (!buf)
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return 0;
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memcpy(buf, src, hlen);
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end = buf+hlen;
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*end = 0; // dereferencing *end is safe
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unfold_hdr(buf, end);
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mesg->msg = buf;
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mesg->end = end;
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mesg->bodychunk = 0; // src is not ours
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mesg->orig_header = src;
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return mesg;
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}
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void
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blaze822_free(struct message *mesg)
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{
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if (!mesg)
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return;
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if (mesg->bodychunk == mesg->msg) {
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munmap(mesg->bodychunk, mesg->bodyend - mesg->msg);
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} else {
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free(mesg->msg);
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free(mesg->bodychunk);
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}
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free(mesg);
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}
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char *
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blaze822_hdr_(struct message *mesg, const char *hdr, size_t hdrlen)
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{
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char *v;
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if (hdrlen == 0 || hdrlen-1 >= (size_t)(mesg->end - mesg->msg))
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return 0; // header too small for the key, probably empty
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// special case: first header, no leading nul
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if (memcmp(mesg->msg, hdr+1, hdrlen-1) == 0) {
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v = mesg->msg;
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hdrlen--;
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} else {
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v = mymemmem(mesg->msg, mesg->end - mesg->msg, hdr, hdrlen);
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}
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if (!v)
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return 0;
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v += hdrlen;
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while (*v && iswsp(*v))
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v++;
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return v;
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}
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char *
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blaze822_chdr(struct message *mesg, const char *chdr)
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{
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char hdr[256];
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char *c;
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size_t l = snprintf(hdr, sizeof hdr, "%c%s:", 0, chdr);
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for (c = hdr+1; *c; c++)
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*c = lc(*c);
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return blaze822_hdr_(mesg, hdr, l);
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}
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struct message *
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blaze822_file(char *file)
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{
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char *buf = 0;
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ssize_t rd = 0, n;
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int fd = open(file, O_RDONLY);
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if (fd < 0)
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return 0;
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struct stat st;
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if (fstat(fd, &st) < 0)
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goto error;
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if (S_ISFIFO(st.st_mode)) { // unbounded read, grow buffer
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const ssize_t bufblk = 16384;
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ssize_t bufalloc = bufblk;
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buf = malloc(bufalloc);
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if (!buf)
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goto error;
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do {
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if (bufalloc < rd + bufblk) {
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bufalloc *= 2;
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buf = realloc(buf, bufalloc);
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if (!buf)
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goto error;
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}
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if ((n = read(fd, buf + rd, bufblk)) < 0) {
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if (errno == EINTR) {
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continue;
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} else {
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perror("read");
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goto error;
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}
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}
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rd += n;
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} while (n > 0);
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} else { // file size known
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ssize_t s = st.st_size;
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buf = malloc(s+1);
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if (!buf)
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goto error;
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do {
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if ((n = read(fd, buf + rd, s - rd)) < 0) {
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if (errno == EINTR) {
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continue;
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} else {
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perror("read");
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goto error;
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}
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}
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rd += n;
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} while (rd < s && n > 0);
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}
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close(fd);
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buf[rd] = 0;
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// XXX duplicate header in ram...
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struct message *mesg = blaze822_mem(buf, rd);
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if (mesg)
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mesg->bodychunk = buf;
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return mesg;
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error:
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close(fd);
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free(buf);
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return 0;
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}
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struct message *
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blaze822_mmap(char *file)
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{
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int fd = open(file, O_RDONLY);
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if (fd < 0)
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return 0;
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struct stat st;
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if (fstat(fd, &st) < 0)
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goto error;
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size_t len = st.st_size;
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struct message *mesg = malloc(sizeof (struct message));
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if (!mesg)
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goto error;
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char *buf = mmap(0, len+1, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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if (buf == MAP_FAILED) {
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perror("mmap");
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goto error;
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}
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close(fd);
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char *end;
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if ((end = mymemmem(buf, len, "\n\n", 2))) {
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mesg->body = end+2;
|
|
} else if ((end = mymemmem(buf, len, "\r\n\r\n", 4))) {
|
|
mesg->body = end+4;
|
|
} else {
|
|
end = buf + len;
|
|
mesg->body = end;
|
|
}
|
|
|
|
unfold_hdr(buf, end);
|
|
|
|
mesg->msg = mesg->bodychunk = buf;
|
|
mesg->end = end;
|
|
mesg->bodyend = buf + len;
|
|
mesg->orig_header = 0;
|
|
|
|
return mesg;
|
|
|
|
error:
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
size_t
|
|
blaze822_headerlen(struct message *mesg)
|
|
{
|
|
return mesg->end - mesg->msg;
|
|
}
|
|
|
|
char *
|
|
blaze822_body(struct message *mesg)
|
|
{
|
|
return mesg->body;
|
|
}
|
|
|
|
char *
|
|
blaze822_orig_header(struct message *mesg)
|
|
{
|
|
return mesg->orig_header;
|
|
}
|
|
|
|
size_t
|
|
blaze822_bodylen(struct message *mesg)
|
|
{
|
|
if (!mesg->body || !mesg->bodyend)
|
|
return 0;
|
|
return mesg->bodyend - mesg->body;
|
|
}
|
|
|
|
char *
|
|
blaze822_next_header(struct message *mesg, char *prev)
|
|
{
|
|
if (!prev) {
|
|
prev = mesg->msg;
|
|
} else {
|
|
if (prev >= mesg->end)
|
|
return 0;
|
|
prev = prev + strlen(prev);
|
|
}
|
|
while (prev < mesg->end && *prev == 0)
|
|
prev++;
|
|
if (prev >= mesg->end)
|
|
return 0;
|
|
return prev;
|
|
}
|