diff options
Diffstat (limited to 'source3/lib/substitute.c')
| -rw-r--r-- | source3/lib/substitute.c | 430 |
1 files changed, 367 insertions, 63 deletions
diff --git a/source3/lib/substitute.c b/source3/lib/substitute.c index e878ee8cbf..6d96a1820f 100644 --- a/source3/lib/substitute.c +++ b/source3/lib/substitute.c @@ -84,6 +84,66 @@ static size_t expand_env_var(char *p, int len) } /******************************************************************* + Given a pointer to a %$(NAME) in p and the whole string in str + expand it as an environment variable. + Return a new allocated and expanded string. + Based on code by Branko Cibej <branko.cibej@hermes.si> + When this is called p points at the '%' character. + May substitute multiple occurrencies of the same env var. +********************************************************************/ + + +static char * realloc_expand_env_var(char *str, char *p) +{ + char *envname; + char *envval; + char *q, *r; + int copylen; + + if (p[0] != '%' || p[1] != '$' || p[2] != '(') + return str; + + /* + * Look for the terminating ')'. + */ + + if ((q = strchr_m(p,')')) == NULL) { + DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p)); + return str; + } + + /* + * Extract the name from within the %$(NAME) string. + */ + + r = p + 3; + copylen = q - r; + envname = (char *)malloc(copylen + 1 + 4); /* reserve space for use later add %$() chars */ + if (envname == NULL) return NULL; + strncpy(envname,r,copylen); + envname[copylen] = '\0'; + + if ((envval = getenv(envname)) == NULL) { + DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname)); + SAFE_FREE(envname); + return str; + } + + /* + * Copy the full %$(NAME) into envname so it + * can be replaced. + */ + + copylen = q + 1 - p; + strncpy(envname,p,copylen); + envname[copylen] = '\0'; + r = realloc_string_sub(str, envname, envval); + SAFE_FREE(envname); + if (r == NULL) return NULL; + return r; +} + +/******************************************************************* Patch from jkf@soton.ac.uk Added this to implement %p (NIS auto-map version of %H) *******************************************************************/ @@ -160,9 +220,11 @@ static char *automount_server(const char *user_name) /**************************************************************************** Do some standard substitutions in a string. + len is the length in bytes of the space allowed in string str. If zero means + don't allow expansions. ****************************************************************************/ -void standard_sub_basic(const char *smb_name, char *str) +void standard_sub_basic(const char *smb_name, char *str,size_t len) { char *p, *s; fstring pidstr; @@ -171,7 +233,10 @@ void standard_sub_basic(const char *smb_name, char *str) for (s=str; (p=strchr_m(s, '%'));s=p) { fstring tmp_str; - int l = sizeof(pstring) - (int)(p-str); + int l = (int)len - (int)(p-str); + + if (l < 0) + l = 0; switch (*(p+1)) { case 'U' : @@ -192,26 +257,43 @@ void standard_sub_basic(const char *smb_name, char *str) strupper(tmp_str); string_sub(p,"%D", tmp_str,l); break; - case 'I' : string_sub(p,"%I", client_addr(),l); break; + case 'I' : + string_sub(p,"%I", client_addr(),l); + break; case 'L' : - if (*local_machine) { + if (*local_machine) string_sub(p,"%L", local_machine,l); - } else { + else string_sub(p,"%L", global_myname,l); - } break; - case 'M' : string_sub(p,"%M", client_name(),l); break; - case 'R' : string_sub(p,"%R", remote_proto,l); break; - case 'T' : string_sub(p,"%T", timestring(False),l); break; - case 'a' : string_sub(p,"%a", remote_arch,l); break; + case 'M' : + string_sub(p,"%M", client_name(),l); + break; + case 'R' : + string_sub(p,"%R", remote_proto,l); + break; + case 'T' : + string_sub(p,"%T", timestring(False),l); + break; + case 'a' : + string_sub(p,"%a", remote_arch,l); + break; case 'd' : slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid()); string_sub(p,"%d", pidstr,l); break; - case 'h' : string_sub(p,"%h", myhostname(),l); break; - case 'm' : string_sub(p,"%m", remote_machine,l); break; - case 'v' : string_sub(p,"%v", VERSION,l); break; - case '$' : p += expand_env_var(p,l); break; /* Expand environment variables */ + case 'h' : + string_sub(p,"%h", myhostname(),l); + break; + case 'm' : + string_sub(p,"%m", remote_machine,l); + break; + case 'v' : + string_sub(p,"%v", VERSION,l); + break; + case '$' : + p += expand_env_var(p,l); + break; /* Expand environment variables */ case '\0': p++; break; /* don't run off the end of the string */ @@ -222,34 +304,34 @@ void standard_sub_basic(const char *smb_name, char *str) } } -/**************************************************************************** - Do some standard substitutions in a string. -****************************************************************************/ - -void standard_sub_advanced(int snum, const char *user, const char *connectpath, gid_t gid, const char *smb_name, char *str) +static void standard_sub_advanced(int snum, const char *user, + const char *connectpath, gid_t gid, + const char *smb_name, char *str, size_t len) { char *p, *s, *home; for (s=str; (p=strchr_m(s, '%'));s=p) { - int l = sizeof(pstring) - (int)(p-str); - + int l = (int)len - (int)(p-str); + + if (l < 0) + l = 0; + switch (*(p+1)) { - case 'N' : string_sub(p,"%N", automount_server(user),l); break; + case 'N' : + string_sub(p,"%N", automount_server(user),l); + break; case 'H': - if ((home = get_user_home_dir(user))) { + if ((home = get_user_home_dir(user))) string_sub(p,"%H",home, l); - } else { + else p += 2; - } break; case 'P': string_sub(p,"%P", connectpath, l); break; - case 'S': string_sub(p,"%S", lp_servicename(snum), l); break; - case 'g': string_sub(p,"%g", gidtoname(gid), l); break; @@ -276,54 +358,293 @@ void standard_sub_advanced(int snum, const char *user, const char *connectpath, } } - standard_sub_basic(smb_name, str); + standard_sub_basic(smb_name, str, len); } /**************************************************************************** Do some standard substitutions in a string. + This function will return an allocated string that have to be freed. ****************************************************************************/ -void standard_sub_conn(connection_struct *conn, char *str) +char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name, const char *str) { - standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath, conn->gid, current_user_info.smb_name, str); + char *a, *t; + a = alloc_sub_basic(smb_name, str); + if (!a) return NULL; + t = talloc_strdup(mem_ctx, a); + SAFE_FREE(a); + return t; +} + +char *alloc_sub_basic(const char *smb_name, const char *str) +{ + char *b, *p, *s, *t, *r, *a_string; + fstring pidstr; + struct passwd *pass; + + a_string = strdup(str); + if (a_string == NULL) { + DEBUG(0, ("alloc_sub_specified: Out of memory!\n")); + return NULL; + } + + for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) { + + r = NULL; + b = t = a_string; + + switch (*(p+1)) { + case 'U' : + r = strdup_lower(smb_name); + if (r == NULL) goto error; + t = realloc_string_sub(t, "%U", r); + break; + case 'G' : + r = strdup(smb_name); + if (r == NULL) goto error; + if ((pass = Get_Pwnam(r))!=NULL) { + t = realloc_string_sub(t, "%G", gidtoname(pass->pw_gid)); + } + break; + case 'D' : + r = strdup_upper(current_user_info.domain); + if (r == NULL) goto error; + t = realloc_string_sub(t, "%D", r); + break; + case 'I' : + t = realloc_string_sub(t, "%I", client_addr()); + break; + case 'L' : + if (*local_machine) + t = realloc_string_sub(t, "%L", local_machine); + else + t = realloc_string_sub(t, "%L", global_myname); + break; + case 'M' : + t = realloc_string_sub(t, "%M", client_name()); + break; + case 'R' : + t = realloc_string_sub(t, "%R", remote_proto); + break; + case 'T' : + t = realloc_string_sub(t, "%T", timestring(False)); + break; + case 'a' : + t = realloc_string_sub(t, "%a", remote_arch); + break; + case 'd' : + slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid()); + t = realloc_string_sub(t, "%d", pidstr); + break; + case 'h' : + t = realloc_string_sub(t, "%h", myhostname()); + break; + case 'm' : + t = realloc_string_sub(t, "%m", remote_machine); + break; + case 'v' : + t = realloc_string_sub(t, "%v", VERSION); + break; + case '$' : + t = realloc_expand_env_var(t, p); /* Expand environment variables */ + break; + + default: + break; + } + + p++; + SAFE_FREE(r); + if (t == NULL) goto error; + a_string = t; + } + + return a_string; +error: + SAFE_FREE(a_string); + return NULL; } /**************************************************************************** - Like standard_sub but for a homes share where snum still points to the [homes] - share. No user specific snum created yet so servicename should be the username. + Do some specific substitutions in a string. + This function will return an allocated string that have to be freed. ****************************************************************************/ -void standard_sub_home(int snum, const char *user, char *str) +char *talloc_sub_specified(TALLOC_CTX *mem_ctx, + const char *input_string, + const char *username, + const char *domain, + uid_t uid, + gid_t gid) { - char *p, *s; + char *a, *t; + a = alloc_sub_specified(input_string, username, domain, uid, gid); + if (!a) return NULL; + t = talloc_strdup(mem_ctx, a); + SAFE_FREE(a); + return t; +} - for (s=str; (p=strchr_m(s, '%'));s=p) { - int l = sizeof(pstring) - (int)(p-str); +char *alloc_sub_specified(const char *input_string, + const char *username, + const char *domain, + uid_t uid, + gid_t gid) +{ + char *a_string, *ret_string; + char *b, *p, *s, *t; + + a_string = strdup(input_string); + if (a_string == NULL) { + DEBUG(0, ("alloc_sub_specified: Out of memory!\n")); + return NULL; + } + + for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) { + + b = t = a_string; + + switch (*(p+1)) { + case 'U' : + t = realloc_string_sub(t, "%U", username); + break; + case 'u' : + t = realloc_string_sub(t, "%u", username); + break; + case 'G' : + if (gid != -1) { + t = realloc_string_sub(t, "%G", gidtoname(gid)); + } else { + t = realloc_string_sub(t, "%G", "NO_GROUP"); + } + break; + case 'g' : + if (gid != -1) { + t = realloc_string_sub(t, "%g", gidtoname(gid)); + } else { + t = realloc_string_sub(t, "%g", "NO_GROUP"); + } + break; + case 'D' : + t = realloc_string_sub(t, "%D", domain); + break; + case 'N' : + t = realloc_string_sub(t, "%N", automount_server(username)); + break; + default: + break; + } + + p++; + if (t == NULL) { + SAFE_FREE(a_string); + return NULL; + } + a_string = t; + } + + ret_string = alloc_sub_basic(username, a_string); + SAFE_FREE(a_string); + return ret_string; +} + +char *talloc_sub_advanced(TALLOC_CTX *mem_ctx, + int snum, + const char *user, + const char *connectpath, + gid_t gid, + const char *smb_name, + char *str) +{ + char *a, *t; + a = alloc_sub_advanced(snum, user, connectpath, gid, smb_name, str); + if (!a) return NULL; + t = talloc_strdup(mem_ctx, a); + SAFE_FREE(a); + return t; +} + +char *alloc_sub_advanced(int snum, const char *user, + const char *connectpath, gid_t gid, + const char *smb_name, char *str) +{ + char *a_string, *ret_string; + char *b, *p, *s, *t, *h; + + a_string = strdup(str); + if (a_string == NULL) { + DEBUG(0, ("alloc_sub_specified: Out of memory!\n")); + return NULL; + } + + for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) { + + b = t = a_string; switch (*(p+1)) { + case 'N' : + t = realloc_string_sub(t, "%N", automount_server(user)); + break; + case 'H': + if ((h = get_user_home_dir(user))) + t = realloc_string_sub(t, "%H", h); + break; + case 'P': + t = realloc_string_sub(t, "%P", connectpath); + break; case 'S': - string_sub(p,"%S", user, l); + t = realloc_string_sub(t, "%S", lp_servicename(snum)); + break; + case 'g': + t = realloc_string_sub(t, "%g", gidtoname(gid)); + break; + case 'u': + t = realloc_string_sub(t, "%u", user); break; + + /* Patch from jkf@soton.ac.uk Left the %N (NIS + * server name) in standard_sub_basic as it is + * a feature for logon servers, hence uses the + * username. The %p (NIS server path) code is + * here as it is used instead of the default + * "path =" string in [homes] and so needs the + * service name, not the username. */ case 'p': - string_sub(p,"%p", automount_path(user), l); + t = realloc_string_sub(t, "%p", automount_path(lp_servicename(snum))); break; - case '\0': - p++; - break; /* don't run off the end of the string */ - default: p+=2; + default: break; } + + p++; + if (t == NULL) { + SAFE_FREE(a_string); + return NULL; + } + a_string = t; } - standard_sub_advanced(snum, user, "", -1, current_user_info.smb_name, str); + ret_string = alloc_sub_basic(smb_name, a_string); + SAFE_FREE(a_string); + return ret_string; +} + +/**************************************************************************** + Do some standard substitutions in a string. +****************************************************************************/ + +void standard_sub_conn(connection_struct *conn, char *str, size_t len) +{ + standard_sub_advanced(SNUM(conn), conn->user, conn->connectpath, + conn->gid, current_user_info.smb_name, str, len); } /**************************************************************************** Like standard_sub but by snum. ****************************************************************************/ -void standard_sub_snum(int snum, char *str) +void standard_sub_snum(int snum, char *str, size_t len) { extern struct current_user current_user; static uid_t cached_uid = -1; @@ -336,23 +657,6 @@ void standard_sub_snum(int snum, char *str) cached_uid = current_user.uid; } - standard_sub_advanced(snum, cached_user, "", -1, current_user_info.smb_name, str); -} - -/******************************************************************* - Substitute strings with useful parameters. -********************************************************************/ - -void standard_sub_vuser(char *str, user_struct *vuser) -{ - standard_sub_advanced(-1, vuser->user.unix_name, "", -1, current_user_info.smb_name, str); -} - -/******************************************************************* - Substitute strings with useful parameters. -********************************************************************/ - -void standard_sub_vsnum(char *str, user_struct *vuser, int snum) -{ - standard_sub_advanced(snum, vuser->user.unix_name, "", -1, current_user_info.smb_name, str); + standard_sub_advanced(snum, cached_user, "", -1, + current_user_info.smb_name, str, len); } |