static struct group *
vnextgrent(char const *nam, gid_t gid, int doclose)
{
struct group *gr;
char *line;
size_t linecap;
ssize_t linelen;
gr = NULL;
line = NULL;
linecap = 0;
linelen = 0;
if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) {
while ((linelen = getline(&line, &linecap, grp_fp)) > 0) {
/* Skip comments and empty lines */
if (*line == '\n' || *line == '#')
continue;
/* trim latest \n */
if (line[linelen - 1 ] == '\n')
line[linelen - 1] = '\0';
gr = gr_scan(line);
if (gid != (gid_t)-1) {
if (gid == gr->gr_gid)
break;
} else if (nam != NULL) {
if (strcmp(nam, gr->gr_name) == 0)
break;
} else
break;
free(gr);
gr = NULL;
}
if (doclose)
vendgrent();
}
free(line);
return (gr);
}
static struct group *
vnextgrent(char const * nam, gid_t gid, int doclose)
{
struct group * gr = NULL;
static char * grtmp = NULL;
static int grlen = 0;
static char ** mems = NULL;
static int memlen = 0;
extendline(&grtmp, &grlen, MAXPATHLEN);
strlcpy(grtmp, getgrpath(_GROUP), MAXPATHLEN);
if (grp_fp != NULL || (grp_fp = fopen(grtmp, "r")) != NULL) {
int done = 0;
static struct group grp;
while (!done && fgets(grtmp, grlen, grp_fp) != NULL)
{
int i, quickout = 0;
int mno = 0;
char * q, * p;
char * sep = ":\n";
if ((p = strchr(grtmp, '\n')) == NULL) {
int l;
extendline(&grtmp, &grlen, grlen + PWBUFSZ);
l = strlen(grtmp);
if (fgets(grtmp + l, grlen - l, grp_fp) == NULL)
break; /* No newline terminator on last line */
}
/* Skip comments and empty lines */
if (*grtmp == '\n' || *grtmp == '#')
continue;
i = 0;
q = p = grtmp;
bzero(&grp, sizeof grp);
extendarray(&mems, &memlen, 200);
while (!quickout && (p = strsep(&q, sep)) != NULL) {
switch (i++)
{
case 0: /* groupname */
grp.gr_name = p;
if (nam) {
if (strcmp(nam, p) == 0)
done = 1;
else
quickout = 1;
}
break;
case 1: /* password */
grp.gr_passwd = p;
break;
case 2: /* gid */
grp.gr_gid = atoi(p);
if (gid != (gid_t)-1) {
if (gid == (gid_t)grp.gr_gid)
done = 1;
else
quickout = 1;
} else if (nam == NULL)
done = 1;
break;
case 3:
q = p;
sep = ",\n";
break;
default:
if (*p) {
extendarray(&mems, &memlen, mno + 2);
mems[mno++] = p;
}
break;
}
}
grp.gr_mem = mems;
mems[mno] = NULL;
}
if (doclose)
vendgrent();
if (done && grp.gr_name) {
gr = &grp;
CKNULL(grp.gr_passwd);
}
}
return gr;
}
int
editgroups(char *name, char **groups)
{
int rc = 0;
int infd;
char groupfile[MAXPATHLEN];
char grouptmp[MAXPATHLEN];
strncpy(groupfile, getgrpath(_GROUP), MAXPATHLEN - 5);
groupfile[MAXPATHLEN - 5] = '\0';
strcpy(grouptmp, groupfile);
strcat(grouptmp, ".new");
if ((infd = open(groupfile, O_RDWR | O_CREAT | O_EXLOCK, 0644)) != -1) {
FILE *infp;
if ((infp = fdopen(infd, "r+")) == NULL)
close(infd);
else {
int outfd;
if ((outfd = open(grouptmp, O_RDWR | O_CREAT | O_TRUNC, 0644)) != -1) {
FILE *outfp;
if ((outfp = fdopen(outfd, "w+")) == NULL)
close(outfd);
else {
int linelen = PWBUFSZ;
int outlen = PWBUFSZ;
int memlen = 200; /* Arbitrary */
char *line = malloc(linelen);
char *outl = malloc(outlen);
char **mems = malloc(memlen * sizeof(char *));
int namlen = strlen(name);
if (line == NULL || outl == NULL || mems == NULL) {
mem_abort:
rc = 0;
} else {
while (fgets(line, linelen, infp) != NULL) {
char *p;
int l;
while ((p = strchr(line, '\n')) == NULL)
{
if (extendline(&line, &linelen, linelen + PWBUFSZ) == -1) {
goto mem_abort;
}
l = strlen(line);
if (fgets(line + l, linelen - l, infp) == NULL)
break; /* No newline terminator on last line */
}
l = strlen(line) + namlen + 1;
if (extendline(&outl, &outlen, l) == -1) {
goto mem_abort;
}
if (*line == '#')
strcpy(outl, line);
else if (*line == '\n')
*outl = '\0';
else {
int i,
mno = 0;
char *cp = line;
char const *sep = ":\n";
struct group grp;
memset(&grp, 0, sizeof grp);
for (i = 0; (p = strsep(&cp, sep)) != NULL; i++) {
switch (i) {
case 0: /* Group name */
grp.gr_name = p;
break;
case 1: /* Group password */
grp.gr_passwd = p;
break;
case 2: /* Group id */
grp.gr_gid = atoi(p);
break;
case 3: /* Member list */
cp = p;
sep = ",\n";
break;
default: /* Individual members */
if (*p) {
if (extendarray(&mems, &memlen, mno + 2) == -1) {
goto mem_abort;
}
mems[mno++] = p;
}
break;
}
}
if (i < 2) /* Bail out - insufficient fields */
continue;
grp.gr_mem = mems;
for (i = mno; i < memlen; i++)
mems[i] = NULL;
/*
* Delete from group, or add to group?
*/
if (groups == NULL || isingroup(grp.gr_name, groups) == -1) { /* Delete */
int idx;
while ((idx = isingroup(name, mems)) != -1) {
for (i = idx; i < (memlen - 1); i++)
mems[i] = mems[i + 1];
mems[i] = NULL;
--mno;
}
/*
* Special case - deleting user and group may be user's own
*/
if (groups == NULL && mems[0] == NULL && strcmp(name, grp.gr_name) == 0) {
/*
* First, make _sure_ we don't have other members
*/
struct passwd *pwd;
SETPWENT();
while ((pwd = GETPWENT()) != NULL && (gid_t)pwd->pw_gid != (gid_t)grp.gr_gid);
ENDPWENT();
if (pwd == NULL) /* No members at all */
continue; /* Drop the group */
}
} else if (isingroup(name, mems) == -1) {
if (extendarray(&mems, &memlen, mno + 2) == -1) {
goto mem_abort;
}
grp.gr_mem = mems; /* May have realloced() */
mems[mno++] = name;
mems[mno ] = NULL;
}
fmtgrentry(&outl, &outlen, &grp, PWF_GROUP);
}
fputs(outl, outfp);
}
if (fflush(outfp) != EOF) {
rc = 1;
/*
* Copy data back into the original file and truncate
*/
rewind(infp);
rewind(outfp);
while (fgets(outl, outlen, outfp) != NULL)
fputs(outl, infp);
/*
* This is a gross hack, but we may have corrupted the
* original file.
*/
if (fflush(infp) == EOF || ferror(infp))
rc = rename(grouptmp, groupfile) == 0;
else
ftruncate(infd, ftell(infp));
}
}
free(mems);
free(outl);
free(line);
fclose(outfp);
}
remove(grouptmp);
}
fclose(infp);
}
}
return rc;
}
