/* vi: set sw=4 ts=4: */ /* Copyright (C) 2003 Manuel Novoa III * * Licensed under GPL v2, or later. See file LICENSE in this tarball. */ /* Nov 6, 2003 Initial version. * * NOTE: This implementation is quite strict about requiring all * field seperators. It also does not allow leading whitespace * except when processing the numeric fields. glibc is more * lenient. See the various glibc difference comments below. * * TODO: * Move to dynamic allocation of (currently statically allocated) * buffers; especially for the group-related functions since * large group member lists will cause error returns. * */ #include "libbb.h" #include <assert.h> #ifndef _PATH_SHADOW #define _PATH_SHADOW "/etc/shadow" #endif #ifndef _PATH_PASSWD #define _PATH_PASSWD "/etc/passwd" #endif #ifndef _PATH_GROUP #define _PATH_GROUP "/etc/group" #endif /**********************************************************************/ /* Sizes for statically allocated buffers. */ /* If you change these values, also change _SC_GETPW_R_SIZE_MAX and * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */ #define PWD_BUFFER_SIZE 256 #define GRP_BUFFER_SIZE 256 /**********************************************************************/ /* Prototypes for internal functions. */ static int bb__pgsreader( int FAST_FUNC (*parserfunc)(void *d, char *line), void *data, char *__restrict line_buff, size_t buflen, FILE *f); static int FAST_FUNC bb__parsepwent(void *pw, char *line); static int FAST_FUNC bb__parsegrent(void *gr, char *line); #if ENABLE_USE_BB_SHADOW static int FAST_FUNC bb__parsespent(void *sp, char *line); #endif /**********************************************************************/ /* We avoid having big global data. */ struct statics { /* Smaller things first */ struct passwd getpwuid_resultbuf; struct group getgrgid_resultbuf; struct passwd getpwnam_resultbuf; struct group getgrnam_resultbuf; char getpwuid_buffer[PWD_BUFFER_SIZE]; char getgrgid_buffer[GRP_BUFFER_SIZE]; char getpwnam_buffer[PWD_BUFFER_SIZE]; char getgrnam_buffer[GRP_BUFFER_SIZE]; #if 0 struct passwd fgetpwent_resultbuf; struct group fgetgrent_resultbuf; struct spwd fgetspent_resultbuf; char fgetpwent_buffer[PWD_BUFFER_SIZE]; char fgetgrent_buffer[GRP_BUFFER_SIZE]; char fgetspent_buffer[PWD_BUFFER_SIZE]; #endif #if 0 //ENABLE_USE_BB_SHADOW struct spwd getspuid_resultbuf; struct spwd getspnam_resultbuf; char getspuid_buffer[PWD_BUFFER_SIZE]; char getspnam_buffer[PWD_BUFFER_SIZE]; #endif // Not converted - too small to bother //pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER; //FILE *pwf /*= NULL*/; //FILE *grf /*= NULL*/; //FILE *spf /*= NULL*/; #if 0 struct passwd getpwent_pwd; struct group getgrent_gr; char getpwent_line_buff[PWD_BUFFER_SIZE]; char getgrent_line_buff[GRP_BUFFER_SIZE]; #endif #if 0 //ENABLE_USE_BB_SHADOW struct spwd getspent_spwd; struct spwd sgetspent_spwd; char getspent_line_buff[PWD_BUFFER_SIZE]; char sgetspent_line_buff[PWD_BUFFER_SIZE]; #endif }; static struct statics *ptr_to_statics; static struct statics *get_S(void) { if (!ptr_to_statics) ptr_to_statics = xzalloc(sizeof(*ptr_to_statics)); return ptr_to_statics; } /* Always use in this order, get_S() must be called first */ #define RESULTBUF(name) &((S = get_S())->name##_resultbuf) #define BUFFER(name) (S->name##_buffer) /**********************************************************************/ /* For the various fget??ent_r funcs, return * * 0: success * ENOENT: end-of-file encountered * ERANGE: buflen too small * other error values possible. See bb__pgsreader. * * Also, *result == resultbuf on success and NULL on failure. * * NOTE: glibc difference - For the ENOENT case, glibc also sets errno. * We do not, as it really isn't an error if we reach the end-of-file. * Doing so is analogous to having fgetc() set errno on EOF. */ /**********************************************************************/ int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct passwd **__restrict result) { int rv; *result = NULL; rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream); if (!rv) { *result = resultbuf; } return rv; } int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct group **__restrict result) { int rv; *result = NULL; rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream); if (!rv) { *result = resultbuf; } return rv; } #if ENABLE_USE_BB_SHADOW #ifdef UNUSED_FOR_NOW int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct spwd **__restrict result) { int rv; *result = NULL; rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream); if (!rv) { *result = resultbuf; } return rv; } #endif #endif /**********************************************************************/ /* For the various fget??ent funcs, return NULL on failure and a * pointer to the appropriate struct (statically allocated) on success. * TODO: audit & stop using these in bbox, they pull in static buffers */ /**********************************************************************/ #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS struct passwd *fgetpwent(FILE *stream) { struct statics *S; struct passwd *resultbuf = RESULTBUF(fgetpwent); char *buffer = BUFFER(fgetpwent); struct passwd *result; fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetpwent)), &result); return result; } struct group *fgetgrent(FILE *stream) { struct statics *S; struct group *resultbuf = RESULTBUF(fgetgrent); char *buffer = BUFFER(fgetgrent); struct group *result; fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetgrent)), &result); return result; } #endif #if ENABLE_USE_BB_SHADOW #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS struct spwd *fgetspent(FILE *stream) { struct statics *S; struct spwd *resultbuf = RESULTBUF(fgetspent); char *buffer = BUFFER(fgetspent); struct spwd *result; fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetspent)), &result); return result; } #endif #ifdef UNUSED_FOR_NOW int sgetspent_r(const char *string, struct spwd *result_buf, char *buffer, size_t buflen, struct spwd **result) { int rv = ERANGE; *result = NULL; if (buflen < PWD_BUFFER_SIZE) { DO_ERANGE: errno = rv; goto DONE; } if (string != buffer) { if (strlen(string) >= buflen) { goto DO_ERANGE; } strcpy(buffer, string); } rv = bb__parsespent(result_buf, buffer); if (!rv) { *result = result_buf; } DONE: return rv; } #endif #endif /* ENABLE_USE_BB_SHADOW */ /**********************************************************************/ #define GETXXKEY_R_FUNC getpwnam_r #define GETXXKEY_R_PARSER bb__parsepwent #define GETXXKEY_R_ENTTYPE struct passwd #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key)) #define GETXXKEY_R_KEYTYPE const char *__restrict #define GETXXKEY_R_PATHNAME _PATH_PASSWD #include "pwd_grp_internal.c" #define GETXXKEY_R_FUNC getgrnam_r #define GETXXKEY_R_PARSER bb__parsegrent #define GETXXKEY_R_ENTTYPE struct group #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key)) #define GETXXKEY_R_KEYTYPE const char *__restrict #define GETXXKEY_R_PATHNAME _PATH_GROUP #include "pwd_grp_internal.c" #if ENABLE_USE_BB_SHADOW #define GETXXKEY_R_FUNC getspnam_r #define GETXXKEY_R_PARSER bb__parsespent #define GETXXKEY_R_ENTTYPE struct spwd #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key)) #define GETXXKEY_R_KEYTYPE const char *__restrict #define GETXXKEY_R_PATHNAME _PATH_SHADOW #include "pwd_grp_internal.c" #endif #define GETXXKEY_R_FUNC getpwuid_r #define GETXXKEY_R_PARSER bb__parsepwent #define GETXXKEY_R_ENTTYPE struct passwd #define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key) #define GETXXKEY_R_KEYTYPE uid_t #define GETXXKEY_R_PATHNAME _PATH_PASSWD #include "pwd_grp_internal.c" #define GETXXKEY_R_FUNC getgrgid_r #define GETXXKEY_R_PARSER bb__parsegrent #define GETXXKEY_R_ENTTYPE struct group #define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key) #define GETXXKEY_R_KEYTYPE gid_t #define GETXXKEY_R_PATHNAME _PATH_GROUP #include "pwd_grp_internal.c" /**********************************************************************/ /* TODO: audit & stop using these in bbox, they pull in static buffers */ /* This one has many users */ struct passwd *getpwuid(uid_t uid) { struct statics *S; struct passwd *resultbuf = RESULTBUF(getpwuid); char *buffer = BUFFER(getpwuid); struct passwd *result; getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpwuid)), &result); return result; } /* This one has many users */ struct group *getgrgid(gid_t gid) { struct statics *S; struct group *resultbuf = RESULTBUF(getgrgid); char *buffer = BUFFER(getgrgid); struct group *result; getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgrgid)), &result); return result; } #if 0 //ENABLE_USE_BB_SHADOW /* This function is non-standard and is currently not built. It seems * to have been created as a reentrant version of the non-standard * functions getspuid. Why getspuid was added, I do not know. */ int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct spwd **__restrict result) { int rv; struct passwd *pp; struct passwd password; char pwd_buff[PWD_BUFFER_SIZE]; *result = NULL; rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp); if (!rv) { rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result); } return rv; } /* This function is non-standard and is currently not built. * Why it was added, I do not know. */ struct spwd *getspuid(uid_t uid) { struct statics *S; struct spwd *resultbuf = RESULTBUF(getspuid); char *buffer = BUFFER(getspuid); struct spwd *result; getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getspuid)), &result); return result; } #endif /* This one has many users */ struct passwd *getpwnam(const char *name) { struct statics *S; struct passwd *resultbuf = RESULTBUF(getpwnam); char *buffer = BUFFER(getpwnam); struct passwd *result; getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpwnam)), &result); return result; } /* This one has many users */ struct group *getgrnam(const char *name) { struct statics *S; struct group *resultbuf = RESULTBUF(getgrnam); char *buffer = BUFFER(getgrnam); struct group *result; getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgrnam)), &result); return result; } #if 0 //ENABLE_USE_BB_SHADOW struct spwd *getspnam(const char *name) { struct statics *S; struct spwd *resultbuf = RESULTBUF(getspnam); char *buffer = BUFFER(getspnam); struct spwd *result; getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getspnam)), &result); return result; } #endif /**********************************************************************/ /* FIXME: we don't have such CONFIG_xx - ?! */ #if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER; # define LOCK pthread_mutex_lock(&mylock) # define UNLOCK pthread_mutex_unlock(&mylock); #else # define LOCK ((void) 0) # define UNLOCK ((void) 0) #endif static FILE *pwf /*= NULL*/; void setpwent(void) { LOCK; if (pwf) { rewind(pwf); } UNLOCK; } void endpwent(void) { LOCK; if (pwf) { fclose(pwf); pwf = NULL; } UNLOCK; } int getpwent_r(struct passwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct passwd **__restrict result) { int rv; LOCK; *result = NULL; /* In case of error... */ if (!pwf) { pwf = fopen_for_read(_PATH_PASSWD); if (!pwf) { rv = errno; goto ERR; } } rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf); if (!rv) { *result = resultbuf; } ERR: UNLOCK; return rv; } static FILE *grf /*= NULL*/; void setgrent(void) { LOCK; if (grf) { rewind(grf); } UNLOCK; } void endgrent(void) { LOCK; if (grf) { fclose(grf); grf = NULL; } UNLOCK; } int getgrent_r(struct group *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct group **__restrict result) { int rv; LOCK; *result = NULL; /* In case of error... */ if (!grf) { grf = fopen_for_read(_PATH_GROUP); if (!grf) { rv = errno; goto ERR; } } rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf); if (!rv) { *result = resultbuf; } ERR: UNLOCK; return rv; } #ifdef UNUSED_FOR_NOW #if ENABLE_USE_BB_SHADOW static FILE *spf /*= NULL*/; void setspent(void) { LOCK; if (spf) { rewind(spf); } UNLOCK; } void endspent(void) { LOCK; if (spf) { fclose(spf); spf = NULL; } UNLOCK; } int getspent_r(struct spwd *resultbuf, char *buffer, size_t buflen, struct spwd **result) { int rv; LOCK; *result = NULL; /* In case of error... */ if (!spf) { spf = fopen_for_read(_PATH_SHADOW); if (!spf) { rv = errno; goto ERR; } } rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf); if (!rv) { *result = resultbuf; } ERR: UNLOCK; return rv; } #endif #endif /* UNUSED_FOR_NOW */ #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS struct passwd *getpwent(void) { static char line_buff[PWD_BUFFER_SIZE]; static struct passwd pwd; struct passwd *result; getpwent_r(&pwd, line_buff, sizeof(line_buff), &result); return result; } struct group *getgrent(void) { static char line_buff[GRP_BUFFER_SIZE]; static struct group gr; struct group *result; getgrent_r(&gr, line_buff, sizeof(line_buff), &result); return result; } #if ENABLE_USE_BB_SHADOW struct spwd *getspent(void) { static char line_buff[PWD_BUFFER_SIZE]; static struct spwd spwd; struct spwd *result; getspent_r(&spwd, line_buff, sizeof(line_buff), &result); return result; } struct spwd *sgetspent(const char *string) { static char line_buff[PWD_BUFFER_SIZE]; static struct spwd spwd; struct spwd *result; sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result); return result; } #endif #endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */ static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid) { FILE *grfile; gid_t *group_list; int ngroups; struct group group; char buff[PWD_BUFFER_SIZE]; /* We alloc space for 8 gids at a time. */ group_list = xmalloc(8 * sizeof(group_list[0])); group_list[0] = gid; ngroups = 1; grfile = fopen_for_read(_PATH_GROUP); if (grfile) { while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) { char **m; assert(group.gr_mem); /* Must have at least a NULL terminator. */ if (group.gr_gid == gid) continue; for (m = group.gr_mem; *m; m++) { if (strcmp(*m, user) != 0) continue; group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups); group_list[ngroups++] = group.gr_gid; break; } } fclose(grfile); } *ngroups_ptr = ngroups; return group_list; } int initgroups(const char *user, gid_t gid) { int ngroups; gid_t *group_list = getgrouplist_internal(&ngroups, user, gid); ngroups = setgroups(ngroups, group_list); free(group_list); return ngroups; } int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups) { int ngroups_old = *ngroups; gid_t *group_list = getgrouplist_internal(ngroups, user, gid); if (*ngroups <= ngroups_old) { ngroups_old = *ngroups; memcpy(groups, group_list, ngroups_old * sizeof(groups[0])); } else { ngroups_old = -1; } free(group_list); return ngroups_old; } #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS int putpwent(const struct passwd *__restrict p, FILE *__restrict f) { int rv = -1; #if 0 /* glibc does this check */ if (!p || !f) { errno = EINVAL; return rv; } #endif /* No extra thread locking is needed above what fprintf does. */ if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n", p->pw_name, p->pw_passwd, (unsigned long)(p->pw_uid), (unsigned long)(p->pw_gid), p->pw_gecos, p->pw_dir, p->pw_shell) >= 0 ) { rv = 0; } return rv; } int putgrent(const struct group *__restrict p, FILE *__restrict f) { int rv = -1; #if 0 /* glibc does this check */ if (!p || !f) { errno = EINVAL; return rv; } #endif if (fprintf(f, "%s:%s:%lu:", p->gr_name, p->gr_passwd, (unsigned long)(p->gr_gid)) >= 0 ) { static const char format[] ALIGN1 = ",%s"; char **m; const char *fmt; fmt = format + 1; assert(p->gr_mem); m = p->gr_mem; while (1) { if (!*m) { if (fputc('\n', f) >= 0) { rv = 0; } break; } if (fprintf(f, fmt, *m) < 0) { break; } m++; fmt = format; } } return rv; } #endif #if ENABLE_USE_BB_SHADOW #ifdef UNUSED_FOR_NOW static const unsigned char put_sp_off[] ALIGN1 = { offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */ offsetof(struct spwd, sp_min), /* 3 - not a char ptr */ offsetof(struct spwd, sp_max), /* 4 - not a char ptr */ offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */ offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */ offsetof(struct spwd, sp_expire) /* 7 - not a char ptr */ }; int putspent(const struct spwd *p, FILE *stream) { const char *fmt; long x; int i; int rv = -1; /* Unlike putpwent and putgrent, glibc does not check the args. */ if (fprintf(stream, "%s:%s:", p->sp_namp, (p->sp_pwdp ? p->sp_pwdp : "")) < 0 ) { goto DO_UNLOCK; } for (i = 0; i < sizeof(put_sp_off); i++) { fmt = "%ld:"; x = *(long *)((char *)p + put_sp_off[i]); if (x == -1) { fmt += 3; } if (fprintf(stream, fmt, x) < 0) { goto DO_UNLOCK; } } if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) { goto DO_UNLOCK; } if (fputc('\n', stream) > 0) { rv = 0; } DO_UNLOCK: return rv; } #endif #endif /* USE_BB_SHADOW */ /**********************************************************************/ /* Internal functions */ /**********************************************************************/ static const unsigned char pw_off[] ALIGN1 = { offsetof(struct passwd, pw_name), /* 0 */ offsetof(struct passwd, pw_passwd), /* 1 */ offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */ offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */ offsetof(struct passwd, pw_gecos), /* 4 */ offsetof(struct passwd, pw_dir), /* 5 */ offsetof(struct passwd, pw_shell) /* 6 */ }; static int FAST_FUNC bb__parsepwent(void *data, char *line) { char *endptr; char *p; int i; i = 0; while (1) { p = (char *) data + pw_off[i]; if (i < 2 || i > 3) { *((char **) p) = line; if (i == 6) { return 0; } /* NOTE: glibc difference - glibc allows omission of * ':' seperators after the gid field if all remaining * entries are empty. We require all separators. */ line = strchr(line, ':'); if (!line) { break; } } else { unsigned long t = strtoul(line, &endptr, 10); /* Make sure we had at least one digit, and that the * failing char is the next field seperator ':'. See * glibc difference note above. */ /* TODO: Also check for leading whitespace? */ if ((endptr == line) || (*endptr != ':')) { break; } line = endptr; if (i & 1) { /* i == 3 -- gid */ *((gid_t *) p) = t; } else { /* i == 2 -- uid */ *((uid_t *) p) = t; } } *line++ = '\0'; i++; } /* while (1) */ return -1; } /**********************************************************************/ static const unsigned char gr_off[] ALIGN1 = { offsetof(struct group, gr_name), /* 0 */ offsetof(struct group, gr_passwd), /* 1 */ offsetof(struct group, gr_gid) /* 2 - not a char ptr */ }; static int FAST_FUNC bb__parsegrent(void *data, char *line) { char *endptr; char *p; int i; char **members; char *end_of_buf; end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */ i = 0; while (1) { p = (char *) data + gr_off[i]; if (i < 2) { *((char **) p) = line; line = strchr(line, ':'); if (!line) { break; } *line++ = '\0'; i++; } else { *((gid_t *) p) = strtoul(line, &endptr, 10); /* NOTE: glibc difference - glibc allows omission of the * trailing colon when there is no member list. We treat * this as an error. */ /* Make sure we had at least one digit, and that the * failing char is the next field seperator ':'. See * glibc difference note above. */ if ((endptr == line) || (*endptr != ':')) { break; } i = 1; /* Count terminating NULL ptr. */ p = endptr; if (p[1]) { /* We have a member list to process. */ /* Overwrite the last ':' with a ',' before counting. * This allows us to (1) test for initial ',' * and (2) adds one ',' so that the number of commas * equals the member count. */ *p = ','; do { /* NOTE: glibc difference - glibc allows and trims leading * (but not trailing) space. We treat this as an error. */ /* NOTE: glibc difference - glibc allows consecutive and * trailing commas, and ignores "empty string" users. We * treat this as an error. */ if (*p == ',') { ++i; *p = 0; /* nul-terminate each member string. */ if (!*++p || (*p == ',') || isspace(*p)) { goto ERR; } } } while (*++p); } /* Now align (p+1), rounding up. */ /* Assumes sizeof(char **) is a power of 2. */ members = (char **)( (((intptr_t) p) + sizeof(char **)) & ~((intptr_t)(sizeof(char **) - 1)) ); if (((char *)(members + i)) > end_of_buf) { /* No space. */ break; } ((struct group *) data)->gr_mem = members; if (--i) { p = endptr; /* Pointing to char prior to first member. */ while (1) { *members++ = ++p; if (!--i) break; while (*++p) continue; } } *members = NULL; return 0; } } /* while (1) */ ERR: return -1; } /**********************************************************************/ #if ENABLE_USE_BB_SHADOW static const unsigned char sp_off[] ALIGN1 = { offsetof(struct spwd, sp_namp), /* 0: char* */ offsetof(struct spwd, sp_pwdp), /* 1: char* */ offsetof(struct spwd, sp_lstchg), /* 2: long */ offsetof(struct spwd, sp_min), /* 3: long */ offsetof(struct spwd, sp_max), /* 4: long */ offsetof(struct spwd, sp_warn), /* 5: long */ offsetof(struct spwd, sp_inact), /* 6: long */ offsetof(struct spwd, sp_expire), /* 7: long */ offsetof(struct spwd, sp_flag) /* 8: unsigned long */ }; static int FAST_FUNC bb__parsespent(void *data, char *line) { char *endptr; char *p; int i; i = 0; while (1) { p = (char *) data + sp_off[i]; if (i < 2) { *((char **) p) = line; line = strchr(line, ':'); if (!line) { break; /* error */ } } else { *((long *) p) = strtoul(line, &endptr, 10); if (endptr == line) { *((long *) p) = -1L; } line = endptr; if (i == 8) { if (*line != '\0') { break; /* error */ } return 0; /* all ok */ } if (*line != ':') { break; /* error */ } } *line++ = '\0'; i++; } return EINVAL; } #endif /**********************************************************************/ /* Reads until EOF, or until it finds a line which fits in the buffer * and for which the parser function succeeds. * * Returns 0 on success and ENOENT for end-of-file (glibc convention). */ static int bb__pgsreader( int FAST_FUNC (*parserfunc)(void *d, char *line), void *data, char *__restrict line_buff, size_t buflen, FILE *f) { int skip; int rv = ERANGE; if (buflen < PWD_BUFFER_SIZE) { errno = rv; return rv; } skip = 0; while (1) { if (!fgets(line_buff, buflen, f)) { if (feof(f)) { rv = ENOENT; } break; } { int line_len = strlen(line_buff) - 1; if (line_len >= 0 && line_buff[line_len] == '\n') { line_buff[line_len] = '\0'; } else if (line_len + 2 == buflen) { /* A start (or continuation) of overlong line */ skip = 1; continue; } /* else: a last line in the file, and it has no '\n' */ } if (skip) { /* This "line" is a remainder of overlong line, ignore */ skip = 0; continue; } /* NOTE: glibc difference - glibc strips leading whitespace from * records. We do not allow leading whitespace. */ /* Skip empty lines, comment lines, and lines with leading * whitespace. */ if (line_buff[0] != '\0' && line_buff[0] != '#' && !isspace(line_buff[0])) { if (parserfunc == bb__parsegrent) { /* Do evil group hack: * The group entry parsing function needs to know where * the end of the buffer is so that it can construct the * group member ptr table. */ ((struct group *) data)->gr_name = line_buff + buflen; } if (parserfunc(data, line_buff) == 0) { rv = 0; break; } } } /* while (1) */ return rv; }