1 /* $OpenBSD: cmd-load-buffer.c,v 1.15 2010/12/30 23:16:18 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 <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <unistd.h> 26 27 #include "tmux.h" 28 29 /* 30 * Loads a session paste buffer from a file. 31 */ 32 33 int cmd_load_buffer_exec(struct cmd *, struct cmd_ctx *); 34 void cmd_load_buffer_callback(struct client *, void *); 35 36 const struct cmd_entry cmd_load_buffer_entry = { 37 "load-buffer", "loadb", 38 CMD_BUFFER_USAGE " path", 39 CMD_ARG1, "", 40 cmd_buffer_init, 41 cmd_buffer_parse, 42 cmd_load_buffer_exec, 43 cmd_buffer_free, 44 cmd_buffer_print 45 }; 46 47 int 48 cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx) 49 { 50 struct cmd_buffer_data *data = self->data; 51 struct client *c = ctx->cmdclient; 52 FILE *f; 53 char *pdata, *new_pdata; 54 size_t psize; 55 u_int limit; 56 int ch; 57 58 if (strcmp(data->arg, "-") == 0) { 59 if (c == NULL) { 60 ctx->error(ctx, "%s: can't read from stdin", data->arg); 61 return (-1); 62 } 63 if (c->flags & CLIENT_TERMINAL) { 64 ctx->error(ctx, "%s: stdin is a tty", data->arg); 65 return (-1); 66 } 67 if (c->stdin_fd == -1) { 68 ctx->error(ctx, "%s: can't read from stdin", data->arg); 69 return (-1); 70 } 71 72 c->stdin_data = &data->buffer; 73 c->stdin_callback = cmd_load_buffer_callback; 74 75 c->references++; 76 bufferevent_enable(c->stdin_event, EV_READ); 77 return (1); 78 } 79 80 if ((f = fopen(data->arg, "rb")) == NULL) { 81 ctx->error(ctx, "%s: %s", data->arg, strerror(errno)); 82 return (-1); 83 } 84 85 pdata = NULL; 86 psize = 0; 87 while ((ch = getc(f)) != EOF) { 88 /* Do not let the server die due to memory exhaustion. */ 89 if ((new_pdata = realloc(pdata, psize + 2)) == NULL) { 90 ctx->error(ctx, "realloc error: %s", strerror(errno)); 91 goto error; 92 } 93 pdata = new_pdata; 94 pdata[psize++] = ch; 95 } 96 if (ferror(f)) { 97 ctx->error(ctx, "%s: read error", data->arg); 98 goto error; 99 } 100 if (pdata != NULL) 101 pdata[psize] = '\0'; 102 103 fclose(f); 104 105 limit = options_get_number(&global_options, "buffer-limit"); 106 if (data->buffer == -1) { 107 paste_add(&global_buffers, pdata, psize, limit); 108 return (0); 109 } 110 if (paste_replace(&global_buffers, data->buffer, pdata, psize) != 0) { 111 ctx->error(ctx, "no buffer %d", data->buffer); 112 return (-1); 113 } 114 115 return (0); 116 117 error: 118 if (pdata != NULL) 119 xfree(pdata); 120 if (f != NULL) 121 fclose(f); 122 return (-1); 123 } 124 125 void 126 cmd_load_buffer_callback(struct client *c, void *data) 127 { 128 char *pdata; 129 size_t psize; 130 u_int limit; 131 int *buffer = data; 132 133 /* 134 * Event callback has already checked client is not dead and reduced 135 * its reference count. But tell it to exit. 136 */ 137 c->flags |= CLIENT_EXIT; 138 139 psize = EVBUFFER_LENGTH(c->stdin_event->input); 140 if (psize == 0) 141 return; 142 143 pdata = malloc(psize + 1); 144 if (pdata == NULL) 145 return; 146 bufferevent_read(c->stdin_event, pdata, psize); 147 pdata[psize] = '\0'; 148 149 limit = options_get_number(&global_options, "buffer-limit"); 150 if (*buffer == -1) 151 paste_add(&global_buffers, pdata, psize, limit); 152 else if (paste_replace(&global_buffers, *buffer, pdata, psize) != 0) { 153 /* No context so can't use server_client_msg_error. */ 154 evbuffer_add_printf( 155 c->stderr_event->output, "no buffer %d\n", *buffer); 156 bufferevent_enable(c->stderr_event, EV_WRITE); 157 } 158 } 159