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
write_userconfig(char const * file)
{
int fd;
if (file == NULL)
file = _PATH_PW_CONF;
if ((fd = open(file, O_CREAT | O_RDWR | O_TRUNC | O_EXLOCK, 0644)) != -1) {
FILE *fp;
if ((fp = fdopen(fd, "w")) == NULL)
close(fd);
else {
int i, j, k;
int len = LNBUFSZ;
char *buf = malloc(len);
for (i = _UC_NONE; i < _UC_FIELDS; i++) {
int quote = 1;
char const *val = buf;
*buf = '\0';
switch (i) {
case _UC_DEFAULTPWD:
val = boolean_str(config.default_password);
break;
case _UC_REUSEUID:
val = boolean_str(config.reuse_uids);
break;
case _UC_REUSEGID:
val = boolean_str(config.reuse_gids);
break;
case _UC_NISPASSWD:
val = config.nispasswd ? config.nispasswd : "";
quote = 0;
break;
case _UC_DOTDIR:
val = config.dotdir ? config.dotdir : boolean_str(0);
break;
case _UC_NEWMAIL:
val = config.newmail ? config.newmail : boolean_str(0);
break;
case _UC_LOGFILE:
val = config.logfile ? config.logfile : boolean_str(0);
break;
case _UC_HOMEROOT:
val = config.home;
break;
case _UC_HOMEMODE:
sprintf(buf, "%04o", config.homemode);
quote = 0;
break;
case _UC_SHELLPATH:
val = config.shelldir;
break;
case _UC_SHELLS:
for (j = k = 0; j < _UC_MAXSHELLS && system_shells[j] != NULL; j++) {
char lbuf[64];
int l = snprintf(lbuf, sizeof lbuf, "%s\"%s\"", k ? "," : "", system_shells[j]);
if (l < 0)
l = 0;
if (l + k + 1 < len || extendline(&buf, &len, len + LNBUFSZ) != -1) {
strcpy(buf + k, lbuf);
k += l;
}
}
quote = 0;
break;
case _UC_DEFAULTSHELL:
val = config.shell_default ? config.shell_default : bourne_shell;
break;
case _UC_DEFAULTGROUP:
val = config.default_group ? config.default_group : "";
break;
case _UC_EXTRAGROUPS:
extendarray(&config.groups, &config.numgroups, 200);
for (j = k = 0; j < config.numgroups && config.groups[j] != NULL; j++) {
char lbuf[64];
int l = snprintf(lbuf, sizeof lbuf, "%s\"%s\"", k ? "," : "", config.groups[j]);
if (l < 0)
l = 0;
if (l + k + 1 < len || extendline(&buf, &len, len + 1024) != -1) {
strcpy(buf + k, lbuf);
k += l;
}
}
quote = 0;
break;
case _UC_DEFAULTCLASS:
val = config.default_class ? config.default_class : "";
break;
case _UC_MINUID:
sprintf(buf, "%lu", (unsigned long) config.min_uid);
quote = 0;
break;
case _UC_MAXUID:
sprintf(buf, "%lu", (unsigned long) config.max_uid);
quote = 0;
break;
case _UC_MINGID:
sprintf(buf, "%lu", (unsigned long) config.min_gid);
quote = 0;
break;
case _UC_MAXGID:
sprintf(buf, "%lu", (unsigned long) config.max_gid);
quote = 0;
break;
case _UC_EXPIRE:
sprintf(buf, "%d", config.expire_days);
quote = 0;
break;
case _UC_PASSWORD:
sprintf(buf, "%d", config.password_days);
quote = 0;
break;
case _UC_NONE:
break;
}
if (comments[i])
fputs(comments[i], fp);
if (*kwds[i]) {
if (quote)
fprintf(fp, "%s = \"%s\"\n", kwds[i], val);
else
fprintf(fp, "%s = %s\n", kwds[i], val);
#if debugging
printf("WROTE: %s = %s\n", kwds[i], val);
#endif
}
}
free(buf);
return fclose(fp) != EOF;
}
}
return 0;
}
struct userconf *
read_userconfig(char const * file)
{
FILE *fp;
extendarray(&config.groups, &config.numgroups, 200);
memset(config.groups, 0, config.numgroups * sizeof(char *));
if (file == NULL)
file = _PATH_PW_CONF;
if ((fp = fopen(file, "r")) != NULL) {
int buflen = LNBUFSZ;
char *buf = malloc(buflen);
nextline:
while (fgets(buf, buflen, fp) != NULL) {
char *p;
while ((p = strchr(buf, '\n')) == NULL) {
int l;
if (extendline(&buf, &buflen, buflen + LNBUFSZ) == -1) {
int ch;
while ((ch = fgetc(fp)) != '\n' && ch != EOF);
goto nextline; /* Ignore it */
}
l = strlen(buf);
if (fgets(buf + l, buflen - l, fp) == NULL)
break; /* Unterminated last line */
}
if (p != NULL)
*p = '\0';
if (*buf && (p = strtok(buf, " \t\r\n=")) != NULL && *p != '#') {
static char const toks[] = " \t\r\n,=";
char *q = strtok(NULL, toks);
int i = 0;
while (i < _UC_FIELDS && strcmp(p, kwds[i]) != 0)
++i;
#if debugging
if (i == _UC_FIELDS)
printf("Got unknown kwd `%s' val=`%s'\n", p, q ? q : "");
else
printf("Got kwd[%s]=%s\n", p, q);
#endif
switch (i) {
case _UC_DEFAULTPWD:
config.default_password = boolean_val(q, 1);
break;
case _UC_REUSEUID:
config.reuse_uids = boolean_val(q, 0);
break;
case _UC_REUSEGID:
config.reuse_gids = boolean_val(q, 0);
break;
case _UC_NISPASSWD:
config.nispasswd = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_DOTDIR:
config.dotdir = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_NEWMAIL:
config.newmail = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_LOGFILE:
config.logfile = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_HOMEROOT:
config.home = (q == NULL || !boolean_val(q, 1))
? "/home" : newstr(q);
break;
case _UC_SHELLPATH:
config.shelldir = (q == NULL || !boolean_val(q, 1))
? "/bin" : newstr(q);
break;
case _UC_SHELLS:
for (i = 0; i < _UC_MAXSHELLS && q != NULL; i++, q = strtok(NULL, toks))
system_shells[i] = newstr(q);
if (i > 0)
while (i < _UC_MAXSHELLS)
system_shells[i++] = NULL;
break;
case _UC_DEFAULTSHELL:
config.shell_default = (q == NULL || !boolean_val(q, 1))
? (char *) bourne_shell : newstr(q);
break;
case _UC_DEFAULTGROUP:
q = unquote(q);
config.default_group = (q == NULL || !boolean_val(q, 1) || GETGRNAM(q) == NULL)
? NULL : newstr(q);
break;
case _UC_EXTRAGROUPS:
for (i = 0; q != NULL; q = strtok(NULL, toks)) {
if (extendarray(&config.groups, &config.numgroups, i + 2) != -1)
config.groups[i++] = newstr(q);
}
if (i > 0)
while (i < config.numgroups)
config.groups[i++] = NULL;
break;
case _UC_DEFAULTCLASS:
config.default_class = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_MINUID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.min_uid = (uid_t) atol(q);
break;
case _UC_MAXUID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.max_uid = (uid_t) atol(q);
break;
case _UC_MINGID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.min_gid = (gid_t) atol(q);
break;
case _UC_MAXGID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.max_gid = (gid_t) atol(q);
break;
case _UC_EXPIRE:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.expire_days = atoi(q);
break;
case _UC_PASSWORD:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.password_days = atoi(q);
break;
case _UC_FIELDS:
case _UC_NONE:
break;
}
}
}
free(buf);
fclose(fp);
}
return &config;
}
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;
}
int
fileupdate(char const * filename, mode_t fmode, char const * newline, char const * prefix, int pfxlen, int updmode)
{
int rc = 0;
if (pfxlen <= 1)
rc = EINVAL;
else {
int infd = open(filename, O_RDWR | O_CREAT, fmode);
if (infd == -1)
rc = errno;
else {
FILE *infp = fdopen(infd, "r+");
if (infp == NULL) {
rc = errno; /* Assumes fopen(3) sets errno from open(2) */
close(infd);
} else {
int outfd;
char file[MAXPATHLEN];
strcpy(file, filename);
strcat(file, ".new");
outfd = open(file, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, fmode);
if (outfd == -1)
rc = errno;
else {
FILE *outfp = fdopen(outfd, "w+");
if (outfp == NULL) {
rc = errno;
close(outfd);
} else {
int updated = UPD_CREATE;
int linesize = PWBUFSZ;
char *line = malloc(linesize);
nextline:
while (fgets(line, linesize, infp) != NULL) {
char *p = strchr(line, '\n');
while ((p = strchr(line, '\n')) == NULL) {
int l;
if (extendline(&line, &linesize, linesize + PWBUFSZ) == -1) {
int ch;
fputs(line, outfp);
while ((ch = fgetc(infp)) != EOF) {
fputc(ch, outfp);
if (ch == '\n')
break;
}
goto nextline;
}
l = strlen(line);
if (fgets(line + l, linesize - l, infp) == NULL)
break;
}
if (*line != '#' && *line != '\n') {
if (!updated && strncmp(line, prefix, pfxlen) == 0) {
updated = updmode == UPD_REPLACE ? UPD_REPLACE : UPD_DELETE;
/*
* Only actually write changes if updating
*/
if (updmode == UPD_REPLACE)
strcpy(line, newline);
else if (updmode == UPD_DELETE)
continue;
}
}
fputs(line, outfp);
}
/*
* Now, we need to decide what to do: If we are in
* update mode, and no record was updated, then error If
* we are in insert mode, and record already exists,
* then error
*/
if (updmode != updated)
/* -1 return means:
* update,delete=no user entry
* create=entry exists
*/
rc = -1;
else {
/*
* If adding a new record, append it to the end
*/
if (updmode == UPD_CREATE)
fputs(newline, outfp);
/*
* Flush the file and check for the result
*/
if (fflush(outfp) == EOF)
rc = errno; /* Failed to update */
else {
/*
* Copy data back into the
* original file and truncate
*/
rewind(infp);
rewind(outfp);
while (fgets(line, linesize, outfp) != NULL)
fputs(line, infp);
/*
* If there was a problem with copying
* we will just rename 'file.new'
* to 'file'.
* This is a gross hack, but we may have
* corrupted the original file
* Unfortunately, it will lose the inode
* and hence the lock.
*/
if (fflush(infp) == EOF || ferror(infp))
rename(file, filename);
else
ftruncate(infd, ftell(infp));
}
}
free(line);
fclose(outfp);
}
remove(file);
}
fclose(infp);
}
}
}
return rc;
}
