/* * virterror.c: implements error handling and reporting code for libvirt * * Copy: Copyright (C) 2006 Red Hat, Inc. * * See COPYING.LIB for the License of this software * * Author: Daniel Veillard */ #include #include #include #include #include "libvirt/libvirt.h" #include "libvirt/virterror.h" #include "internal.h" static virError lastErr = /* the last error */ { 0, 0, NULL, VIR_ERR_NONE, NULL, NULL, NULL, NULL, NULL, 0, 0 }; static virErrorFunc virErrorHandler = NULL; /* global error handlet */ static void *virUserData = NULL; /* associated data */ /* * Macro used to format the message as a string in __virRaiseError * and borrowed from libxml2. */ #define VIR_GET_VAR_STR(msg, str) { \ int size, prev_size = -1; \ int chars; \ char *larger; \ va_list ap; \ \ str = (char *) malloc(150); \ if (str != NULL) { \ \ size = 150; \ \ while (1) { \ va_start(ap, msg); \ chars = vsnprintf(str, size, msg, ap); \ va_end(ap); \ if ((chars > -1) && (chars < size)) { \ if (prev_size == chars) { \ break; \ } else { \ prev_size = chars; \ } \ } \ if (chars > -1) \ size += chars + 1; \ else \ size += 100; \ if ((larger = (char *) realloc(str, size)) == NULL) { \ break; \ } \ str = larger; \ }} \ } /* * virGetLastError: * * Provide a pointer to the last error caught at the library level * Simpler but may not be suitable for multithreaded accesses, in which * case use virCopyLastError() * * Returns a pointer to the last error or NULL if none occured. */ virErrorPtr virGetLastError(void) { if (lastErr.code == VIR_ERR_OK) return (NULL); return (&lastErr); } /* * virCopyLastError: * @to: target to receive the copy * * Copy the content of the last error caught at the library level * One will need to free the result with virResetError() * * Returns 0 if no error was found and the error code otherwise and -1 in case * of parameter error. */ int virCopyLastError(virErrorPtr to) { if (to == NULL) return (-1); if (lastErr.code == VIR_ERR_OK) return (0); memcpy(to, &lastErr, sizeof(virError)); return (lastErr.code); } /** * virResetError: * @err: pointer to the virError to clean up * * Reset the error being pointed to */ void virResetError(virErrorPtr err) { if (err == NULL) return; if (err->message != NULL) free(err->message); if (err->str1 != NULL) free(err->str1); if (err->str2 != NULL) free(err->str2); if (err->str3 != NULL) free(err->str3); memset(err, 0, sizeof(virError)); } /** * virResetLastError: * * Reset the last error caught at the library level. */ void virResetLastError(void) { virResetError(&lastErr); } /** * virConnGetLastError: * @conn: pointer to the hypervisor connection * * Provide a pointer to the last error caught on that connection * Simpler but may not be suitable for multithreaded accesses, in which * case use virConnCopyLastError() * * Returns a pointer to the last error or NULL if none occured. */ virErrorPtr virConnGetLastError(virConnectPtr conn) { if (conn == NULL) return (NULL); return (&conn->err); } /** * virConnCopyLastError: * @conn: pointer to the hypervisor connection * @to: target to receive the copy * * Copy the content of the last error caught on that connection * One will need to free the result with virResetError() * * Returns 0 if no error was found and the error code otherwise and -1 in case * of parameter error. */ int virConnCopyLastError(virConnectPtr conn, virErrorPtr to) { if (conn == NULL) return (-1); if (to == NULL) return (-1); if (conn->err.code == VIR_ERR_OK) return (0); memcpy(to, &conn->err, sizeof(virError)); return (conn->err.code); } /** * virConnResetLastError: * @conn: pointer to the hypervisor connection * * Reset the last error caught on that connection */ void virConnResetLastError(virConnectPtr conn) { if (conn == NULL) return; virResetError(&conn->err); } /** * virSetErrorFunc: * @userData: pointer to the user data provided in the handler callback * @handler: the function to get called in case of error or NULL * * Set a library global error handling function, if @handler is NULL, * it will reset to default printing on stderr. The error raised there * are those for which no handler at the connection level could caught. */ void virSetErrorFunc(void *userData, virErrorFunc handler) { virErrorHandler = handler; virUserData = userData; } /** * virConnSetErrorFunc: * @conn: pointer to the hypervisor connection * @userData: pointer to the user data provided in the handler callback * @handler: the function to get called in case of error or NULL * * Set a connection error handling function, if @handler is NULL * it will reset to default which is to pass error back to the global * library handler. */ void virConnSetErrorFunc(virConnectPtr conn, void *userData, virErrorFunc handler) { if (conn == NULL) return; conn->handler = handler; conn->userData = userData; } /** * virDefaultErrorFunc: * @err: pointer to the error. * * Default routine reporting an error to stderr. */ void virDefaultErrorFunc(virErrorPtr err) { const char *lvl = "", *dom = "", *domain = ""; int len; if ((err == NULL) || (err->code == VIR_ERR_OK)) return; switch (err->level) { case VIR_ERR_NONE: lvl = ""; break; case VIR_ERR_WARNING: lvl = "warning"; break; case VIR_ERR_ERROR: lvl = "error"; break; } switch (err->domain) { case VIR_FROM_NONE: dom = ""; break; case VIR_FROM_XEN: dom = "Xen "; break; case VIR_FROM_XEND: dom = "Xen Daemon "; break; case VIR_FROM_XENSTORE: dom = "Xen Store "; break; case VIR_FROM_DOM: dom = "Domain "; break; case VIR_FROM_RPC: dom = "XML-RPC "; break; } if ((err->dom != NULL) && (err->code != VIR_ERR_INVALID_DOMAIN)) { domain = err->dom->name; } len = strlen(err->message); if ((len == 0) || (err->message[len - 1] != '\n')) fprintf(stderr, "libvir: %s%s %s: %s\n", dom, lvl, domain, err->message); else fprintf(stderr, "libvir: %s%s %s: %s", dom, lvl, domain, err->message); } /** * __virRaiseError: * @conn: the connection to the hypervisor if available * @dom: the domain if available * @domain: the virErrorDomain indicating where it's coming from * @code: the virErrorNumber code for the error * @level: the virErrorLevel for the error * @str1: extra string info * @str2: extra string info * @str3: extra string info * @int1: extra int info * @int2: extra int info * @msg: the message to display/transmit * @...: extra parameters for the message display * * Internal routine called when an error is detected. It will raise it * immediately if a callback is found and store it for later handling. */ void __virRaiseError(virConnectPtr conn, virDomainPtr dom, int domain, int code, virErrorLevel level, const char *str1, const char *str2, const char *str3, int int1, int int2, const char *msg, ...) { virErrorPtr to = &lastErr; void *userData = virUserData; virErrorFunc handler = virErrorHandler; char *str; if (code == VIR_ERR_OK) return; /* * try to find the best place to save and report the error */ if (conn != NULL) { to = &conn->err; if (conn->handler != NULL) { handler = conn->handler; userData = conn->userData; } } /* * formats the message */ if (msg == NULL) { str = strdup("No error message provided"); } else { VIR_GET_VAR_STR(msg, str); } /* * Save the information about the error */ virResetError(to); to->conn = conn; to->dom = dom; to->domain = domain; to->code = code; to->message = str; to->level = level; if (str1 != NULL) to->str1 = strdup(str1); if (str2 != NULL) to->str2 = strdup(str2); if (str3 != NULL) to->str3 = strdup(str3); to->int1 = int1; to->int2 = int2; /* * now, report it */ if (handler != NULL) { handler(userData, to); } else { virDefaultErrorFunc(to); } } /** * __virErrorMsg: * @error: the virErrorNumber * @info: usually the first paprameter string * * Internal routine to get the message associated to an error raised * from the library * * Returns the constant string associated to @error */ const char * __virErrorMsg(virErrorNumber error, const char *info) { const char *errmsg = NULL; switch (error) { case VIR_ERR_OK: return (NULL); case VIR_ERR_INTERNAL_ERROR: if (info != NULL) errmsg = "internal error %s"; else errmsg = "internal error"; break; case VIR_ERR_NO_MEMORY: errmsg = "out of memory"; break; case VIR_ERR_NO_SUPPORT: if (info != NULL) errmsg = "no support for hypervisor"; else errmsg = "no support for hypervisor %s"; break; case VIR_ERR_NO_CONNECT: if (info == NULL) errmsg = "could not connect to hypervisor"; else errmsg = "could not connect to %s"; break; case VIR_ERR_INVALID_CONN: if (info == NULL) errmsg = "invalid connection pointer in"; else errmsg = "invalid connection pointer in %s"; break; case VIR_ERR_INVALID_DOMAIN: if (info == NULL) errmsg = "invalid domain pointer in"; else errmsg = "invalid domain pointer in %s"; break; case VIR_ERR_INVALID_ARG: if (info == NULL) errmsg = "invalid argument in"; else errmsg = "invalid argument in %s"; break; case VIR_ERR_OPERATION_FAILED: if (info != NULL) errmsg = "operation failed: %s"; else errmsg = "operation failed"; break; case VIR_ERR_GET_FAILED: if (info != NULL) errmsg = "GET operation failed: %s"; else errmsg = "GET operation failed"; break; case VIR_ERR_POST_FAILED: if (info != NULL) errmsg = "POST operation failed: %s"; else errmsg = "POST operation failed"; break; case VIR_ERR_HTTP_ERROR: errmsg = "got unknown HTTP error code %d"; break; case VIR_ERR_UNKNOWN_HOST: if (info != NULL) errmsg = "unknown host %s"; else errmsg = "unknown host"; break; case VIR_ERR_SEXPR_SERIAL: if (info != NULL) errmsg = "failed to serialize S-Expr: %s"; else errmsg = "failed to serialize S-Expr"; break; case VIR_ERR_NO_XEN: if (info == NULL) errmsg = "could not use Xen hypervisor entry"; else errmsg = "could not use Xen hypervisor entry %s"; break; case VIR_ERR_NO_XENSTORE: if (info == NULL) errmsg = "could not connect to Xen Store"; else errmsg = "could not connect to Xen Store %s"; break; case VIR_ERR_XEN_CALL: errmsg = "failed Xen syscall %s %d"; break; case VIR_ERR_OS_TYPE: if (info == NULL) errmsg = "unknown OS type"; else errmsg = "unknown OS type %s"; break; case VIR_ERR_NO_KERNEL: errmsg = "missing kernel information"; break; case VIR_ERR_NO_ROOT: if (info == NULL) errmsg = "missing root device information"; else errmsg = "missing root device information in %s"; break; case VIR_ERR_NO_SOURCE: if (info == NULL) errmsg = "missing source information for device"; else errmsg = "missing source information for device %s"; break; case VIR_ERR_NO_TARGET: if (info == NULL) errmsg = "missing target information for device"; else errmsg = "missing target information for device %s"; break; case VIR_ERR_NO_NAME: if (info == NULL) errmsg = "missing domain name information"; else errmsg = "missing domain name information in %s"; break; case VIR_ERR_NO_OS: if (info == NULL) errmsg = "missing operating system information"; else errmsg = "missing operating system information for %s"; break; case VIR_ERR_NO_DEVICE: if (info == NULL) errmsg = "missing devices information"; else errmsg = "missing devices information for %s"; break; case VIR_ERR_DRIVER_FULL: if (info == NULL) errmsg = "too many drivers registered"; else errmsg = "too many drivers registered in %s"; break; case VIR_ERR_CALL_FAILED: if (info == NULL) errmsg = "library call failed, possibly not supported"; else errmsg = "library call %s failed, possibly not supported"; break; case VIR_ERR_XML_ERROR: if (info == NULL) errmsg = "XML description not well formed or invalid"; else errmsg = "XML description for %s is not well formed or invalid"; break; case VIR_ERR_DOM_EXIST: if (info == NULL) errmsg = "this domain exists already"; else errmsg = "domain %s exists already"; break; case VIR_ERR_OPERATION_DENIED: if (info == NULL) errmsg = "operation forbidden for read only access"; else errmsg = "operation %s forbidden for read only access"; break; case VIR_ERR_OPEN_FAILED: if (info == NULL) errmsg = "failed to open configuration file for reading"; else errmsg = "failed to open %s for reading"; break; case VIR_ERR_READ_FAILED: if (info == NULL) errmsg = "failed to read configuration file"; else errmsg = "failed to read configuration file %s"; break; case VIR_ERR_PARSE_FAILED: if (info == NULL) errmsg = "failed to parse configuration file"; else errmsg = "failed to parse configuration file %s"; break; case VIR_ERR_CONF_SYNTAX: if (info == NULL) errmsg = "configuration file syntax error"; else errmsg = "configuration file syntax error: %s"; break; case VIR_ERR_WRITE_FAILED: if (info == NULL) errmsg = "failed to write configuration file"; else errmsg = "failed to write configuration file: %s"; break; } return (errmsg); }