diff options
Diffstat (limited to 'src/minidentd/mgetuid-linux.c')
| -rw-r--r-- | src/minidentd/mgetuid-linux.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/src/minidentd/mgetuid-linux.c b/src/minidentd/mgetuid-linux.c deleted file mode 100644 index f374adf..0000000 --- a/src/minidentd/mgetuid-linux.c +++ /dev/null @@ -1,184 +0,0 @@ -/* ISC license. */ - -#include <sys/types.h> -#include <string.h> -#include <stdint.h> -#include <skalibs/uint64.h> -#include <skalibs/types.h> -#include <skalibs/fmtscan.h> -#include <skalibs/buffer.h> -#include <skalibs/stralloc.h> -#include <skalibs/djbunix.h> -#include <skalibs/ip46.h> -#include <skalibs/skamisc.h> -#include "mgetuid.h" - -#ifdef DEBUG -#include <skalibs/strerr2.h> -#define bug(a) do { strerr_warn4x("bug parsing ", a, "remaining: ", cur) ; return 0 ; } while (0) -#else -#define bug(a) return 0 -#endif - -#define LINESIZE 256 - -static int skipspace (char **s) -{ - while (**s && ((**s == ' ') || (**s == '\t'))) - (*s)++ ; - return (int)**s ; -} - -static void reverse_address (char *s, size_t n) -{ - size_t i = n >> 1 ; - while (i--) - { - char tmp = s[i] ; - s[i] = s[n-1-i] ; - s[n-1-i] = tmp ; - } -} - -static int parseline (char *s, size_t len, uid_t *u, char *la, uint16_t *lp, char *ra, uint16_t *rp, int is6) -{ - char *cur = s ; - size_t pos ; - uint64_t uu ; - uint32_t junk ; - unsigned int iplen = is6 ? 16 : 4 ; - - if (!skipspace(&cur)) bug("initial whitespace") ; - pos = uint32_scan(cur, &junk) ; /* sl */ - if (!pos || (cur-s+1+pos) > len) bug("sl") ; - cur += pos ; - if ((*cur++) != ':') bug("sl:") ; - if (!skipspace(&cur)) bug("sl: SPACE") ; - - if ((cur - s + 1 + iplen) > len) bug("local_address") ; - pos = ucharn_scan(cur, la, iplen) ; /* local_address */ - reverse_address(la, iplen) ; - if (!pos) bug("local_address") ; - cur += pos ; - if ((*cur++) != ':') bug("local_address:") ; - - pos = uint16_xscan(cur, lp) ; /* :port */ - if (!pos || (cur-s+pos) > len) bug("local_port") ; - cur += pos ; - if (!skipspace(&cur)) bug("local_port SPACE") ; - - if ((cur - s + 1 + iplen) > len) bug("remote_address") ; - pos = ucharn_scan(cur, ra, iplen) ; /* remote_address */ - reverse_address(ra, iplen) ; - if (!pos) bug("remote_address") ; - cur += pos ; - if ((*cur++) != ':') bug("remote_address:") ; - - pos = uint16_xscan(cur, rp) ; /* :port */ - if (!pos || (cur-s+pos) > len) bug("remote_port") ; - cur += pos ; - if (!skipspace(&cur)) bug("remote_port SPACE"); - - pos = uint32_xscan(cur, &junk) ; /* st */ - if (!pos || (cur-s+pos) > len) bug("st") ; - cur += pos ; - if (!skipspace(&cur)) bug("st SPACE") ; - pos = uint32_xscan(cur, &junk) ; /* tx_queue */ - if (!pos || (cur-s+1+pos) > len) bug("tx_queue") ; - cur += pos ; - if ((*cur++) != ':') bug("tx_queue:") ; - pos = uint32_xscan(cur, &junk) ; /* rx_queue */ - if (!pos || (cur-s+pos) > len) bug("rx_queue") ; - cur += pos ; - if (!skipspace(&cur)) bug("rx_queue SPACE") ; - pos = uint32_xscan(cur, &junk) ; /* tr */ - if (!pos || (cur-s+1+pos) > len) bug("tr") ; - cur += pos ; - if ((*cur++) != ':') bug("tr:") ; - pos = uint32_xscan(cur, &junk) ; /* tm->when */ - if (!pos || (cur-s+pos) > len) bug("tm->when") ; - cur += pos ; - if (!skipspace(&cur)) bug("tm->when SPACE") ; - pos = uint32_xscan(cur, &junk) ; /* retrnsmt */ - if (!pos || (cur-s+pos) > len) bug("retrnsmt") ; - cur += pos ; - - if (!skipspace(&cur)) bug("retrnsmt SPACE") ; - pos = uint64_scan(cur, &uu) ; /* uid */ - if (!pos || (cur-s+1+pos) > len) bug("uid") ; - *u = uu ; - return 1 ; -} - -#ifdef DEBUG - -static void debuglog (uint16_t a, uint16_t b, unsigned int c, char const *d, char const *e, int is6) -{ - char sa[UINT16_FMT] ; - char sb[UINT16_FMT] ; - char sc[UINT_FMT] ; - char sd[IP46_FMT] ; - char se[IP46_FMT] ; - - sa[uint16_fmt(sa, a)] = 0 ; - sb[uint16_fmt(sb, b)] = 0 ; - sc[uint_fmt(sc, c)] = 0 ; - sd[is6 ? ip6_fmt(sd, d) : ip4_fmt(sd, d)] = 0 ; - se[is6 ? ip6_fmt(se, e) : ip4_fmt(se, e)] = 0 ; - - buffer_puts(buffer_2, sd) ; - buffer_puts(buffer_2, ":") ; - buffer_puts(buffer_2, sa) ; - buffer_puts(buffer_2, " , ") ; - buffer_puts(buffer_2, se) ; - buffer_puts(buffer_2, ":") ; - buffer_puts(buffer_2, sb) ; - buffer_puts(buffer_2, " -> ") ; - buffer_puts(buffer_2, sc) ; - buffer_putsflush(buffer_2, "\n") ; -} - -#endif - -uid_t mgetuid (ip46_t const *localaddr, uint16_t localport, ip46_t const *remoteaddr, uint16_t remoteport) -{ - int r ; - uid_t u = -2 ; - stralloc line = STRALLOC_ZERO ; - buffer b ; - char y[BUFFER_INSIZE] ; - int is6 = ip46_is6(localaddr) ; - int fd = open_readb(is6 ? "/proc/net/tcp6" : "/proc/net/tcp") ; - if (fd == -1) return -2 ; - buffer_init(&b, &buffer_read, fd, y, BUFFER_INSIZE_SMALL) ; - if (skagetln(&b, &line, '\n') < 1) goto err ; -#ifdef DEBUG - line.s[line.len-1] = 0 ; - debuglog(localport, remoteport, 65535, localaddr->ip, remoteaddr->ip, is6) ; -#endif - for (;;) - { - char la[16] ; - char ra[16] ; - uid_t nu ; - uint16_t lp, rp ; - line.len = 0 ; - r = skagetln(&b, &line, '\n') ; - if (r <= 0) { u = -1 ; break ; } - line.s[line.len-1] = 0 ; - if (!parseline(line.s, line.len, &nu, la, &lp, ra, &rp, is6)) break ; -#ifdef DEBUG - debuglog(lp, rp, nu, la, ra, is6) ; -#endif - if ((lp == localport) && (rp == remoteport) - && !memcmp(la, localaddr->ip, is6 ? 16 : 4) - && !memcmp(ra, remoteaddr->ip, is6 ? 16 : 4)) - { - u = nu ; break ; - } - } - stralloc_free(&line) ; - err: - fd_close(fd) ; - return u ; -} |