63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
#include "pwf.h"
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#include <pthread.h>
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#define FIX(x) (gr->gr_##x = gr->gr_##x-line+buf)
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static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
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{
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FILE *f;
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char *line = 0;
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size_t len = 0;
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char **mem = 0;
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size_t nmem = 0;
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int rv = 0;
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size_t i;
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int cs;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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f = fopen("/etc/group", "rbe");
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if (!f) {
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rv = errno;
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goto done;
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}
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*res = 0;
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while (__getgrent_a(f, gr, &line, &len, &mem, &nmem)) {
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if (name && !strcmp(name, gr->gr_name)
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|| !name && gr->gr_gid == gid) {
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if (size < len + nmem*sizeof(char *) + 32) {
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rv = ERANGE;
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break;
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}
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*res = gr;
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buf += (16-(uintptr_t)buf)%16;
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gr->gr_mem = (void *)buf;
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buf += nmem*sizeof(char *);
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memcpy(buf, line, len);
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FIX(name);
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FIX(passwd);
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for (i=0; mem[i]; i++)
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gr->gr_mem[i] = mem[i]-line+buf;
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gr->gr_mem[i] = 0;
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break;
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}
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}
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free(mem);
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free(line);
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fclose(f);
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done:
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pthread_setcancelstate(cs, 0);
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return rv;
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}
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int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struct group **res)
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{
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return getgr_r(name, 0, gr, buf, size, res);
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}
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int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
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{
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return getgr_r(0, gid, gr, buf, size, res);
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}
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