1 /* $OpenBSD: cmd-load-buffer.c,v 1.48 2017/01/06 13:26:09 nicm Exp $ */ 2 3 /* 4 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 #include "tmux.h" 29 30 /* 31 * Loads a paste buffer from a file. 32 */ 33 34 static enum cmd_retval cmd_load_buffer_exec(struct cmd *, struct cmdq_item *); 35 36 static void cmd_load_buffer_callback(struct client *, int, void *); 37 38 const struct cmd_entry cmd_load_buffer_entry = { 39 .name = "load-buffer", 40 .alias = "loadb", 41 42 .args = { "b:", 1, 1 }, 43 .usage = CMD_BUFFER_USAGE " path", 44 45 .flags = CMD_AFTERHOOK, 46 .exec = cmd_load_buffer_exec 47 }; 48 49 struct cmd_load_buffer_data { 50 struct cmdq_item *item; 51 char *bufname; 52 }; 53 54 static enum cmd_retval 55 cmd_load_buffer_exec(struct cmd *self, struct cmdq_item *item) 56 { 57 struct args *args = self->args; 58 struct cmd_load_buffer_data *cdata; 59 struct client *c = item->client; 60 struct session *s; 61 FILE *f; 62 const char *path, *bufname, *cwd; 63 char *pdata, *new_pdata, *cause, *file; 64 char resolved[PATH_MAX]; 65 size_t psize; 66 int ch, error; 67 68 bufname = NULL; 69 if (args_has(args, 'b')) 70 bufname = args_get(args, 'b'); 71 72 path = args->argv[0]; 73 if (strcmp(path, "-") == 0) { 74 cdata = xcalloc(1, sizeof *cdata); 75 cdata->item = item; 76 77 if (bufname != NULL) 78 cdata->bufname = xstrdup(bufname); 79 80 error = server_set_stdin_callback(c, cmd_load_buffer_callback, 81 cdata, &cause); 82 if (error != 0) { 83 cmdq_error(item, "%s: %s", path, cause); 84 free(cause); 85 return (CMD_RETURN_ERROR); 86 } 87 return (CMD_RETURN_WAIT); 88 } 89 90 if (c != NULL && c->session == NULL && c->cwd != NULL) 91 cwd = c->cwd; 92 else if (c != NULL && (s = c->session) != NULL && s->cwd != NULL) 93 cwd = s->cwd; 94 else 95 cwd = "."; 96 97 if (*path == '/') 98 file = xstrdup(path); 99 else 100 xasprintf(&file, "%s/%s", cwd, path); 101 if (realpath(file, resolved) == NULL && 102 strlcpy(resolved, file, sizeof resolved) >= sizeof resolved) { 103 cmdq_error(item, "%s: %s", file, strerror(ENAMETOOLONG)); 104 return (CMD_RETURN_ERROR); 105 } 106 f = fopen(resolved, "rb"); 107 free(file); 108 if (f == NULL) { 109 cmdq_error(item, "%s: %s", resolved, strerror(errno)); 110 return (CMD_RETURN_ERROR); 111 } 112 113 pdata = NULL; 114 psize = 0; 115 while ((ch = getc(f)) != EOF) { 116 /* Do not let the server die due to memory exhaustion. */ 117 if ((new_pdata = realloc(pdata, psize + 2)) == NULL) { 118 cmdq_error(item, "realloc error: %s", strerror(errno)); 119 goto error; 120 } 121 pdata = new_pdata; 122 pdata[psize++] = ch; 123 } 124 if (ferror(f)) { 125 cmdq_error(item, "%s: read error", resolved); 126 goto error; 127 } 128 if (pdata != NULL) 129 pdata[psize] = '\0'; 130 131 fclose(f); 132 133 if (paste_set(pdata, psize, bufname, &cause) != 0) { 134 cmdq_error(item, "%s", cause); 135 free(pdata); 136 free(cause); 137 return (CMD_RETURN_ERROR); 138 } 139 140 return (CMD_RETURN_NORMAL); 141 142 error: 143 free(pdata); 144 if (f != NULL) 145 fclose(f); 146 return (CMD_RETURN_ERROR); 147 } 148 149 static void 150 cmd_load_buffer_callback(struct client *c, int closed, void *data) 151 { 152 struct cmd_load_buffer_data *cdata = data; 153 char *pdata, *cause, *saved; 154 size_t psize; 155 156 if (!closed) 157 return; 158 c->stdin_callback = NULL; 159 160 server_client_unref(c); 161 if (c->flags & CLIENT_DEAD) 162 goto out; 163 164 psize = EVBUFFER_LENGTH(c->stdin_data); 165 if (psize == 0 || (pdata = malloc(psize + 1)) == NULL) 166 goto out; 167 168 memcpy(pdata, EVBUFFER_DATA(c->stdin_data), psize); 169 pdata[psize] = '\0'; 170 evbuffer_drain(c->stdin_data, psize); 171 172 if (paste_set(pdata, psize, cdata->bufname, &cause) != 0) { 173 /* No context so can't use server_client_msg_error. */ 174 if (~c->flags & CLIENT_UTF8) { 175 saved = cause; 176 cause = utf8_sanitize(saved); 177 free(saved); 178 } 179 evbuffer_add_printf(c->stderr_data, "%s", cause); 180 server_client_push_stderr(c); 181 free(pdata); 182 free(cause); 183 } 184 out: 185 cdata->item->flags &= ~CMDQ_WAITING; 186 187 free(cdata->bufname); 188 free(cdata); 189 } 190